CN117269890A - Radar interference signal monitoring and analyzing equipment - Google Patents
Radar interference signal monitoring and analyzing equipment Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 134
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- 230000033228 biological regulation Effects 0.000 claims description 43
- 238000005259 measurement Methods 0.000 claims description 36
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- 238000012549 training Methods 0.000 abstract description 8
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- 230000015607 signal release Effects 0.000 abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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Abstract
A radar interference signal monitoring and analyzing device comprises a monitoring antenna subsystem, a monitoring host subsystem and a main control subsystem; the monitoring antenna subsystem completes directional receiving of the space radar interference signal; the monitoring host completes the frequency conversion, analog-to-digital conversion and interference signal analysis processing of the radio frequency radar interference signal; the master control subsystem completes the control and display of the whole system. The invention solves the problems that the radar interference signal is lack of rapid monitoring and refined analysis means in the radar interference signal training process and the accuracy of interference signal release in the whole test process is difficult to evaluate, and can record the real-time working state, sort the signals, post fine analysis and manual auxiliary identification of the air-based interference radiation source to be tested, thereby providing a scientific and quantitative evaluation means for the interference signal released by the jammer in the radar interference resistance test process.
Description
Technical Field
The invention belongs to the technical field of electromagnetic monitoring, and relates to radar interference signal monitoring and analyzing equipment.
Background
In the radar anti-interference test or radar interference equipment training process, the accuracy of interference signal release is critical to the whole test or training effect. The electromagnetic signal monitoring in the test or training is usually completed by the electromagnetic environment monitoring system, but the monitoring emphasis is on the electromagnetic environment monitoring of the whole test area and the periphery, the real-time on-line and off-line analysis and processing capability of radar interference signals are insufficient, the rapid monitoring and fine analysis means of radar interference signals are lacked, and whether the interference signal patterns released in the test process and the interference signal parameters set by the interference signal patterns are accurate and reasonable cannot be accurately judged. Under the background, in order to meet the accuracy evaluation requirement of the radar anti-interference test or the release of the interference signal in the training process of the radar interference equipment, a radar interference signal monitoring and analyzing device needs to be developed, the rapid monitoring, full pulse acquisition and fine analysis of the radar interference signal are realized, the radar can be effectively helped to complete the anti-interference quantitative evaluation, and the research of the radar interference signal monitoring and analyzing device has a certain engineering value for the establishment of a radar anti-interference quantitative evaluation system. At present, the accuracy of the existing radar interference signal monitoring equipment for radar interference signal monitoring still has larger deviation and lacks the capability of fine parameter analysis and judgment.
Disclosure of Invention
The technical solution of the invention aims at: aiming at the defects of the prior art, the radar interference signal monitoring and analyzing equipment is provided, and the accuracy of the release of the interference signal in the radar anti-interference test or the radar interference equipment training process can be scientifically evaluated.
The technical scheme of the invention is as follows: a radar interference signal monitoring and analyzing device comprises a monitoring antenna subsystem, a monitoring host subsystem and a main control subsystem;
the monitoring antenna subsystem realizes the erection of orthogonal polarization of the monitoring antenna with a preset frequency band, and completes the directional detection of the radio-frequency radar interference signal of space radiation and the transmission to the monitoring host subsystem;
the monitoring host subsystem receives the radio-frequency radar interference signals transmitted by the monitoring antenna, and processes the radio-frequency signals into intermediate-frequency signals through amplitude limiting, power regulation, filtering and frequency conversion; secondly, sampling, quantizing and encoding the intermediate frequency signal to output baseband data; finally, digital channelizing, signal detection, pulse descriptor measurement, signal sorting and signal identification are carried out on the baseband data;
the main control subsystem is used for completing task configuration and state management of the equipment, receiving the output of the monitoring main control subsystem and realizing a signal residence interception function, a parameter measurement function, an intra-pulse analysis function, a signal type analysis function, a signal acquisition and storage function and a data playback analysis and monitoring display function.
Further, the monitoring antenna subsystem comprises a low-frequency monitoring antenna with a first preset frequency band, a high-frequency monitoring antenna with a second preset frequency band, an antenna fixing structure, a polarization adjusting structure and an antenna bracket;
the low-frequency monitoring antenna of the first preset frequency band comprises a pair of portable logarithmic period antennas, the high-frequency monitoring antenna of the second preset frequency band comprises a pair of broadband logarithmic period antennas, and the portable logarithmic period antennas and the broadband logarithmic period antennas are used in a time sharing mode and used for achieving directional reception of space radar interference signals;
an antenna fixing structure for fixing a pair of antennas currently participating in reception;
the polarization adjustment structure is used for realizing orthogonal polarization erection of two fixed antennas with the same frequency band and comprises orthogonal erection of horizontal polarization and vertical polarization and orthogonal erection of positive 45-degree oblique polarization and negative 45-degree oblique polarization;
and the antenna bracket is used for monitoring the elevation of the antenna.
Further, the monitoring host subsystem comprises a monitoring receiver, an interference signal analysis processing module and a data storage unit;
the monitoring receiver is used for receiving the radio-frequency radar interference signals transmitted by the monitoring antenna subsystem, processing the radio-frequency signals into intermediate-frequency signals through amplitude limiting, power regulation, filtering and frequency conversion, sampling, quantizing and encoding the intermediate-frequency signals, and outputting baseband data to the interference signal analysis processing module;
the interference signal analysis processing module is used for carrying out digital channelizing, signal detection, pulse descriptor measurement and signal sorting identification processing on the baseband data, generating a radiation source descriptor, uploading the radiation source descriptor to the main control subsystem, and uploading polarization component amplitude information in the baseband data to the main control subsystem;
and the data storage unit is used for storing the original baseband data and the processing result of the interference signal analysis processing module.
Further, the monitoring receiver comprises a power supply unit circuit, a control unit circuit, a local oscillator unit circuit, a channel unit circuit and an AD acquisition unit;
the power supply unit circuit supplies power to the channel unit circuit, the control unit circuit and the local oscillation unit circuit simultaneously;
the control unit circuit sends a channel gating instruction and a power regulation instruction to the channel unit circuit according to the radio frequency radar interference signal input from the outside, sends a local oscillation signal generation instruction to the local oscillation unit circuit and sends a voltage control instruction to the power supply unit circuit;
the local oscillation unit circuit is used for simultaneously providing a local oscillation signal and two local oscillation signals for the channel unit circuit according to the local oscillation signal generation instruction;
the channel unit circuit carries out channel switching gating according to a channel gating instruction, limits the amplitude of the monitored radio frequency signal, carries out power regulation and control of the radio frequency signal according to a power regulation and control instruction, further carries out filtering treatment, receives a local oscillation signal and two local oscillation signals for twice frequency conversion, converts the radio frequency signal into an intermediate frequency signal, further carries out power regulation and control and frequency selection on the intermediate frequency signal, and outputs intermediate frequency signals with different bandwidths;
and the AD acquisition unit is used for carrying out analog-to-digital conversion on the intermediate frequency signal output by the channel unit circuit and processing the intermediate frequency signal into baseband data.
Further, the channel unit circuit comprises a receiving front end, a frequency conversion module, an intermediate frequency power regulation module and an output frequency selection group; the receiving front end comprises a channel 1 limiter, a channel 2 limiter, a change-over switch, a radio frequency power regulation and control unit and a preselection filter bank;
the channel 1 limiter and the channel 2 limiter are used in a time sharing way, a low-frequency radio frequency signal of a first preset frequency band is input into the channel 1 limiter, and a high-frequency radio frequency signal of a second preset frequency band is input into the channel 2 limiter; the channel 1 limiter and the channel 2 limiter are used in a time sharing way, and the radio frequency signals exceeding a preset power threshold are connected to the change-over switch after being subjected to limiting output; the change-over switch realizes the switch gating of the channel 1 and the channel 2 and outputs the switch gating to the radio frequency power regulation and control unit; the radio frequency power regulation and control unit amplifies or attenuates according to the power of the input radio frequency signal, realizes the power regulation and control of the radio frequency signal, and outputs the power to the preselection filter bank; the preselection filter bank is used for filtering signals outside the monitoring frequency band and outputting the signals to the frequency conversion module;
the frequency conversion module receives the radio frequency signal output by the preselect filter bank and the first local oscillation signal and the second local oscillation signal output by the local oscillation unit circuit, is used for converting the received radio frequency signal into an intermediate frequency signal by twice frequency conversion and outputs the intermediate frequency signal to the intermediate frequency power regulation and control module;
the intermediate frequency power regulation and control module amplifies or attenuates according to the power of the input intermediate frequency signal, realizes the power regulation and control of the intermediate frequency signal, and outputs the intermediate frequency signal to the output frequency selection group;
and the output frequency selecting group performs frequency selection on the received intermediate frequency signals and outputs intermediate frequency signals with different bandwidths to the AD acquisition unit.
Further, the interference signal analysis processing module comprises an FPGA processing module and a DSP processing module;
the FPGA processing module receives the baseband data output by the AD acquisition unit, caches the baseband data on one hand and sends the baseband data to the DSP processing module, and performs digital channelized processing, signal detection, pulse descriptor measurement and pulse descriptor caching on the baseband data on the other hand and sends the baseband data to the DSP processing module;
on one hand, the DSP processing module receives the pulse description word, generates a radiation source description word after signal sorting and recognition, and uploads the radiation source description word to the main control subsystem, and on the other hand, receives the baseband data, and uploads the waveform or frequency spectrum data and polarization component amplitude information in the baseband data to the main control subsystem.
Further, the main control subsystem comprises a signal monitoring and displaying function module, a signal residence and interception function module, a parameter measuring function module, an intra-pulse analysis function module, a signal type analysis function module, a signal acquisition and storage function module and a data playback analysis module;
the signal monitoring display function module is used for realizing panoramic spectrogram display, medium-frequency spectrogram, pulse running water chart, pulse time domain waveform chart, pulse spectrogram and parameter measurement list display;
a signal interception function module for realizing interception under multi-gear adjustable instantaneous working bandwidth;
the parameter measurement function module is used for realizing the measurement of signal arrival time, signal frequency, signal bandwidth, signal amplitude, pulse width, pulse repetition period type, modulation type, polarization mode, suppression interference type and deception interference type;
the intra-pulse analysis function module is used for acquiring intra-pulse time-frequency characteristics and time-phase characteristics of the signals and extracting characteristic envelopes;
the signal type analysis function module is used for obtaining the modulation type, the signal frequency, the signal bandwidth and the polarization mode measured by the parameter measurement function module, measuring the time domain characteristics of the signal, including pulse width, inter-pulse interval and intra-pulse characteristics, and identifying the type of radar interference signals according to the time domain characteristics, the polarization characteristics and the frequency characteristics of the signal;
and the data playback analysis module is used for realizing dynamic playback and static playback of the collected and stored original data.
Further, the panoramic spectrogram display realizes the frequency spectrum display of the full frequency range of the first preset frequency range and the second preset frequency range;
the intermediate frequency spectrogram displays radar interference signal frequency spectrum and signal bandwidth in the instantaneous bandwidth;
the pulse running water graph displays the signal frequency, the signal amplitude, the pulse width and the pulse repetition period of the monitoring signal in real time in a pulse running water mode;
the pulse time domain waveform diagram shows pulse interval, intra-pulse information and pulse width;
the pulse spectrogram shows the signal frequency, the signal bandwidth and the signal amplitude of the signal;
the parameter measurement list displays various parameters measured by the parameter measurement function module.
Further, the signal acquisition and storage function module comprises full pulse acquisition and storage and trigger acquisition and storage;
collecting and storing all signal data by full pulse collecting and storing;
triggering the acquisition and storage to acquire and store the signals exceeding the set level threshold.
Furthermore, the data playback analysis module supports manual performance of pulse width, inter-pulse interval and intra-pulse characteristics of auxiliary measurement signals during playback, and auxiliary identification of interference signal types is realized. Compared with the prior art, the invention has the following advantages:
(1) The invention adopts the design of inputting the dual monitoring antennas erected by orthogonal polarization, and the two paths share one path of monitoring receiver, and realizes the double-channel switching through the front-end change-over switch, thereby realizing the measurement of the polarization mode of radar interference signals. The designed polarization adjustment structure can realize the orthogonal polarization erection of the monitoring antenna, including the orthogonal erection of horizontal polarization and vertical polarization, and the orthogonal erection of positive 45-degree oblique polarization and negative 45-degree oblique polarization.
(2) The invention adopts a high-sensitivity detection technology and a complex interference signal analysis method, can be suitable for monitoring long-distance, weak and multi-type interference signals, and realizes the rapid extraction, refined analysis and recognition processing of the time sequence characteristics and the frequency domain characteristics of the interference signals including narrow-band aiming interference signals, broadband blocking interference signals, comb spectrum signals, sweep frequency noise and the like.
(3) The invention designs a composite recognition means of automatic software recognition and manual auxiliary measurement, and combines a full-pulse data dynamic playback processing technology to realize the fine analysis and recognition processing of the time domain characteristics of multi-type interference signals such as noise interference signals (including intermittent noise interference, pseudo random noise and the like), decoy signals (multi-decoys, dense decoys, intermittent sampling forwarding and the like) and the like.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 (a) is a schematic diagram of the low frequency monitoring antenna of 100MHz to 300MHz in the present invention;
FIG. 2 (b) is a schematic diagram of the 300MHz to 4000MHz high frequency monitoring antenna of the present invention;
FIG. 3 is a block diagram of an implementation of the monitoring receiver of the present invention;
FIG. 4 is a block diagram of an implementation of the channel element circuit of the present invention;
FIG. 5 is a block diagram of an implementation of the interference signal analysis process of the present invention;
figure 6 is an overall workflow diagram of the system of the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the accompanying drawings.
As shown in fig. 1: the invention relates to radar interference signal monitoring and analyzing equipment which comprises a monitoring antenna subsystem, a monitoring host subsystem and a main control subsystem. The monitoring antenna subsystem comprises a 100 MHz-300 MHz low-frequency antenna, a 300 MHz-4000 MHz high-frequency antenna, an antenna fixing structure, a polarization adjustment structure and a 5m antenna bracket; the monitoring host subsystem comprises a monitoring receiver, an interference signal analysis processing module and a data storage module; the main control subsystem comprises a main control module, a portable integrated machine and a portable energy storage power supply.
Monitoring an antenna subsystem: the monitoring antenna realizes the elevation and cross polarization erection of the monitoring antenna through the 5-meter antenna bracket and the polarization adjustment structure, completes the directional detection of the radio-frequency radar interference signals of space radiation, and then transmits the signals to the monitoring host subsystem;
monitoring a host subsystem: firstly, a monitoring receiver receives a radio-frequency radar interference signal transmitted by a monitoring antenna, and carries out amplitude limiting, power regulation and control, filtering and twice frequency conversion through a channel unit circuit, so that the radio-frequency signal is processed into an intermediate-frequency signal and is input into an AD acquisition unit; secondly, the AD acquisition unit performs sampling, quantization, coding and other processes on the intermediate frequency signal and outputs baseband data to the interference signal analysis processing module; finally, the interference signal analysis processing module carries out digital channelizing, signal detection, pulse Description Word (PDW) measurement, signal sorting and signal identification on the baseband data.
And the main control subsystem: the task configuration and state management of the whole system are completed, and the signal standing and intercepting function, the parameter measuring function, the pulse analysis function, the signal type analysis function, the signal acquisition and storage function and the data playback analysis and monitoring display function are realized.
Specifically, the 100 MHz-300 MHz low frequency antenna in the monitoring antenna subsystem comprises 2 portable log-periodic antennas, the 300 MHz-4000 MHz high frequency antenna comprises 2 broadband log-periodic antennas, and the portable log-periodic antennas and the broadband log-periodic antennas are used in a time-sharing manner and used for realizing directional reception of space radar interference signals.
The antenna fixing structure is used for simultaneously fixing 2 monitoring antennas of 1 group of same frequency bands which are currently participating in receiving.
The polarization adjustment structure is used for realizing orthogonal polarization erection of two fixed 1-group monitoring antennas with the same frequency band, and comprises orthogonal erection of horizontal polarization and vertical polarization, and orthogonal erection of positive 45-degree oblique polarization and negative 45-degree oblique polarization.
The 5 meter antenna mount is used to monitor the elevation of the antenna.
The schematic diagram of the monitoring antenna is shown in fig. 2 (a) and fig. 2 (b).
The monitoring receiver mainly completes the processing of filtering, frequency conversion and the like of the radio frequency signals into intermediate frequency signals, and then the intermediate frequency signals are processed into baseband data through the AD acquisition unit. As shown in fig. 3, the monitoring receiver includes a channel unit circuit, a local oscillator unit circuit, a power supply unit circuit, a control unit circuit, and an AD acquisition unit.
The power supply unit circuit supplies power to the channel unit circuit, the control unit circuit and the local oscillation unit circuit simultaneously.
The control unit circuit receives an externally input control command signal, analyzes an external command, and further controls the channel unit circuit, the local oscillator unit circuit and the power supply unit circuit to coordinate with each other so as to change the working state of the monitoring receiver and meet the command requirement; the method specifically comprises the following steps: the control unit circuit sends a channel gating instruction and a power regulation instruction (such as power attenuation or amplification) to the channel unit circuit according to the radio frequency radar interference signal input from the outside, sends a local oscillation signal generation instruction to the local oscillation unit circuit, and sends a voltage control instruction to the power supply unit circuit.
The local oscillation unit circuit is used for simultaneously providing a local oscillation signal and two local oscillation signals for the channel unit circuit according to the local oscillation signal generation instruction;
the channel unit circuit carries out channel switching gating according to a channel gating instruction, limits the monitored radio frequency signals, carries out power regulation and control of the radio frequency signals according to a power regulation and control instruction, further carries out filtering processing, receives a local oscillation signal and two local oscillation signals for twice frequency conversion, converts the radio frequency signals into intermediate frequency signals, further carries out power regulation and control and frequency selection on the intermediate frequency signals, and outputs intermediate frequency signals with different bandwidths.
The AD acquisition unit carries out analog-to-digital conversion on the intermediate frequency signal output by the channel unit circuit and processes the intermediate frequency signal into baseband data.
Preferably, as shown in fig. 4, the channel unit circuit includes a receiving front end, a frequency conversion module, an intermediate frequency power regulation module, and an output frequency selection group.
The receiving front end comprises two radio frequency signal channels, a channel 1 limiter, a channel 2 limiter, a change-over switch, a radio frequency power regulation and control unit and a preselection filter bank; the method mainly completes amplitude limiting, filtering and radio frequency signal power regulation and control on the monitoring signals.
Specifically, a low-frequency radio frequency signal of 100 MHz-300 MHz is input to a channel 1 limiter through a channel 1, and a high-frequency radio frequency signal of 300 MHz-4000 MHz is input to a channel 2 limiter through a channel 2; the channel 1 limiter and the channel 2 limiter are used in a time sharing way, and the monitored radio frequency signals exceeding a preset power threshold (for example, 5W) are limited and output respectively, so that the rear-end radio frequency device is prevented from being burnt; the outputs of the channel 1 limiter and the channel 2 limiter are connected to a change-over switch, the change-over switch realizes the switch gating of the channel 1 and the channel 2, and the outputs of the change-over switch are connected to a radio frequency power regulation and control unit; the radio frequency power regulation and control unit amplifies and attenuates according to the power of the input radio frequency signal to realize the power regulation and control of the radio frequency signal, and the output of the radio frequency power regulation and control unit is connected to the preselect filter bank; the preselection filter group is used for filtering out signals outside the monitoring frequency band and outputting the signals to the frequency conversion module.
The frequency conversion module receives the radio frequency signal output by the preselect filter bank and the first local oscillation signal and the second local oscillation signal output by the local oscillation unit circuit, and is used for converting the received radio frequency signal into an intermediate frequency signal and outputting the intermediate frequency signal to the intermediate frequency power regulation and control module.
The intermediate frequency power regulation and control module amplifies and attenuates according to the power of the input intermediate frequency signal, realizes the power regulation and control of the intermediate frequency signal, and outputs the intermediate frequency signal to the output frequency selection group.
And the output frequency selecting group performs frequency selection on the received intermediate frequency signals and outputs intermediate frequency signals with different bandwidths to the AD acquisition unit.
As shown in fig. 5, the interference signal analysis processing module includes an FPGA processing module and a DSP processing module. The FPGA processing module receives baseband data output by the AD acquisition unit, caches the baseband data on one hand and sends the baseband data to the DSP processing module, and performs digital channelizing processing, signal detection, pulse Description Word (PDW) measurement and Pulse Description Word (PDW) caching on the baseband data on the other hand and sends the baseband data to the DSP processing module.
On one hand, the DSP processing module receives Pulse Description Words (PDWs), generates radiation source description words (EDWs) after signal sorting and identification, and uploads the radiation source description words (EDWs) to the main control subsystem through the network interface, and on the other hand, receives baseband data, and uploads waveform or spectrum data and polarization component amplitude information in the baseband data to the main control subsystem through the network interface; and performs flow control.
And a data storage module: the system comprises two 4T disk arrays, which are used for completing the storage of spectrum data, collected original baseband data and the like.
The main control subsystem comprises a main control module, a portable integrated machine and a portable energy storage power supply.
And the main control module: the system comprises a signal monitoring and displaying function module, a signal residence and interception function module, a parameter measuring function module, an intra-pulse analysis function module, a signal type analysis function module, a signal acquisition and storage function module and a data playback analysis module.
The signal monitoring and displaying functional module comprises a panoramic frequency spectrum diagram display, an intermediate frequency spectrum diagram, a pulse running water diagram, a pulse time domain waveform diagram, a pulse frequency spectrum diagram and a parameter measurement list display. Specifically, the panoramic spectrogram shows the spectrum display of the full frequency band of 100 MHz-4000 MHz. The intermediate frequency spectrogram displays the information such as radar interference signal frequency spectrum, signal bandwidth and the like in the instantaneous bandwidth. The pulse running water graph displays the signal frequency, signal amplitude, pulse width, pulse repetition period and the like of the monitoring signal in real time in a pulse running water mode, and specifically comprises the following steps: time/frequency flow chart, time/amplitude flow chart, time/pulse width flow chart, and time/repetition period flow chart. The pulse time domain waveform diagram shows information such as pulse interval, intra-pulse information, pulse width and the like. The pulse spectrogram shows information such as signal frequency, signal bandwidth, signal amplitude and the like of the signal. The parameter measurement list shows signal arrival time, signal frequency, signal bandwidth, pulse width, pulse repetition Period (PRI) type, modulation type, polarization mode, interference signal type, etc.
And the signal interception function module is used for realizing interception under the multi-gear adjustable instantaneous working bandwidth.
The parameter measurement function module is mainly used for measuring parameters such as signal arrival time, signal frequency, signal bandwidth, signal amplitude, pulse width, pulse repetition Period (PRI) type, modulation type, polarization mode, suppression interference type, deception interference type and the like.
The intra-pulse analysis function module is used for mainly completing feature extraction of intra-pulse information of the signals, analyzing intra-pulse time-frequency characteristics and time-phase characteristics of the signals, extracting feature envelopes and completing deep analysis function of the signals.
The signal type analysis function module acquires the modulation type, the signal frequency, the signal bandwidth and the polarization mode measured by the parameter measurement function module, adopts the time domain characteristics of the manual auxiliary measurement signals, including pulse width, inter-pulse interval and intra-pulse characteristics, and identifies the type of radar interference signals according to the time domain characteristics, the polarization characteristics and the frequency characteristics of the signals.
The signal acquisition and storage function module comprises full pulse acquisition and storage and trigger acquisition and storage.
The full pulse acquisition and storage mainly completes the acquisition and storage of all data including radar signals and radar interference signals.
Triggering the acquisition and storage to mainly finish the acquisition and storage of signals exceeding a set level threshold.
The data playback analysis module is mainly used for completing dynamic playback and static playback of the collected and stored original data. During playback, the pulse width, the inter-pulse interval, the intra-pulse characteristics and the like of auxiliary measurement signals are supported to be manually carried out, and the identification of the type of the interference signal is assisted.
The portable integrated machine adopts a portable reinforced computer design, and integrates a keyboard, a display, a computer module and the like. The system is used for installing a main control module and completing the centralized control and display functions of task configuration, system management, monitoring acquisition, data storage, analysis processing and the like of the system.
The portable energy storage power supply is used for providing 24V direct current power supply for the portable all-in-one machine.
As shown in fig. 6, for more visual expression, a practical application case is provided in the embodiment of the present invention to describe the above flow and modules:
(1) Description of background requirements
According to the actual monitoring requirement of a certain radar anti-interference test task, radar interference signals released by an air jammer of the test task are required to be monitored, collected, analyzed and stored in real time, working states such as release time, duration and the like of the interference signals are recorded, and signal parameters, signal types and the like are analyzed in a refined mode through post playback, so that a scientific and quantitative evaluation means is provided for the interference signals in the radar anti-interference test process.
(2) System outfield deployment
Before the test task starts, the whole system needs to be unfolded to finish the lifting and erection of the monitoring antenna and the connection of the radio frequency cable. As shown in fig. 2 (a) and 2 (b), the monitoring antenna is mounted on the antenna mount through the polarization adjustment structure, the antenna mount is mounted on the 5m support, and the elevation of the monitoring antenna is realized by controlling the elevation of the support. Wherein, the low frequency antenna of 100 MHz-300 MHz and the high frequency antenna of 300 MHz-4000 MHz are used in a time sharing way. During low frequency monitoring, 2 low frequency antennas of 100 MHz-300 MHz are required to be erected simultaneously, horizontal and vertical orthogonal polarization erection is adopted in an initial state, and the vertical polarization erection can be manually adjusted to positive and negative oblique 45-degree orthogonal erection according to task requirements. Similarly, during high-frequency monitoring, 2 high-frequency antennas of 300MHz to 4000MHz are required to be erected simultaneously, and the erection mode is consistent with that of the low-frequency antennas. After the antenna is erected, the two monitoring antennas are connected with the monitoring host subsystem through the radio frequency cable.
(3) Real-time analysis of interference signals
After the whole system is unfolded, the portable integrated machine is powered on and started by the portable energy storage battery, and the main control module is started. The system is initialized, a self-checking program is executed, a monitoring mode is entered after the self-checking is finished, and the monitoring mode is manually selected at a main control module interface according to task requirements, wherein the monitoring mode comprises real-time analysis and playback analysis.
In real-time analysis mode: and executing 100 MHz-4000 MHz full-band scanning monitoring during non-cooperative target monitoring task, and executing resident monitoring if the non-cooperative target monitoring task is the cooperative target monitoring task. When the signal is detected, the information such as a signal spectrogram, a pulse time domain image, a pulse flow chart, parameter measurement and the like in the intermediate frequency instantaneous bandwidth can be displayed in real time on the main control interface. The pulse flow chart specifically comprises the following steps: time/frequency flow chart, time/amplitude flow chart, time/pulse width flow chart, time/repetition period flow chart, four groups in total; the parameter measurements are displayed in list form, comprising in particular: the parameter measurement list shows signal arrival time, signal frequency, signal bandwidth, pulse width, pulse repetition Period (PRI) type, modulation type, polarization mode, interference signal type, etc.
The instantaneous working bandwidth can be adjusted at the main control interface according to the monitoring requirement, and the method specifically comprises the following steps: 6 gears in total of 5MHz, 10MHz, 50MHz, 100MHz, 200MHz and 300 MHz. For example, the monitored interference signal is a narrow-band aiming noise signal and the signal is weak, so that the instantaneous working bandwidth of the system can be reduced to improve the monitoring sensitivity of the system. In addition, the system also has signal polarization mode measuring capability in the real-time analysis mode. The specific test procedure is as follows: during monitoring, the signal is defaulted to 1 channel to measure the received signal amplitude P1, then the signal is switched to 2 channels to measure the received signal amplitude P2, the signal amplitude difference of the two channels is compared to judge the polarization mode of the signal, and the signal is output and displayed.
The user can set full pulse collection or trigger collection according to the requirement, and the collected original data is stored in a disk array in a file form.
(4) Playback analysis of interfering signals
The playback analysis function mainly supports the user to measure and analyze the interference signals in a refined mode, and when the device is used, data files under a specified directory are selected from a data playback analysis module of a main control interface, and data are read from a disk array and played back.
The data reading can select data of important task stages for analysis according to time nodes, and can also select signal data of important attention for interception analysis according to the size of a data file.
The playback analysis is presented in a full pulse playback mode, the playback process and speed can be controlled in the playback process, the intra-pulse information, inter-pulse information and pulse group information of the signals are checked, and related parameter values can be manually measured by using a measuring tool, so that the types of various interference signals can be judged and analyzed.
The method solves the problems that in the radar anti-interference test or the radar interference equipment training process, a rapid monitoring and refined analysis means for radar interference signals are lacked, and the accuracy of interference signal release in the whole test process is difficult to evaluate. At present, the system is applied to the actual test task of a certain army, can realize real-time working state recording, parameter measurement, signal analysis and identification and the like of an interference radiation source, and provides a scientific and quantitative evaluation means for interference signals released in the radar interference equipment training process.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. The radar interference signal monitoring and analyzing device is characterized by comprising a monitoring antenna subsystem, a monitoring host subsystem and a main control subsystem;
the monitoring antenna subsystem realizes the erection of orthogonal polarization of the monitoring antenna with a preset frequency band, and completes the directional detection of the radio-frequency radar interference signal of space radiation and the transmission to the monitoring host subsystem;
the monitoring host subsystem receives the radio-frequency radar interference signals transmitted by the monitoring antenna, and processes the radio-frequency signals into intermediate-frequency signals through amplitude limiting, power regulation, filtering and frequency conversion; secondly, sampling, quantizing and encoding the intermediate frequency signal to output baseband data; finally, digital channelizing, signal detection, pulse descriptor measurement, signal sorting and signal identification are carried out on the baseband data;
the main control subsystem is used for completing task configuration and state management of the equipment, receiving the output of the monitoring main control subsystem and realizing a signal residence interception function, a parameter measurement function, an intra-pulse analysis function, a signal type analysis function, a signal acquisition and storage function and a data playback analysis and monitoring display function.
2. The radar interference signal monitoring and analyzing device according to claim 1, wherein the monitoring antenna subsystem comprises a low-frequency monitoring antenna of a first preset frequency band, a high-frequency monitoring antenna of a second preset frequency band, an antenna fixing structure, a polarization adjusting structure and an antenna bracket;
the low-frequency monitoring antenna of the first preset frequency band comprises a pair of portable logarithmic period antennas, the high-frequency monitoring antenna of the second preset frequency band comprises a pair of broadband logarithmic period antennas, and the portable logarithmic period antennas and the broadband logarithmic period antennas are used in a time sharing mode and used for achieving directional reception of space radar interference signals;
an antenna fixing structure for fixing a pair of antennas currently participating in reception;
the polarization adjustment structure is used for realizing orthogonal polarization erection of two fixed antennas with the same frequency band and comprises orthogonal erection of horizontal polarization and vertical polarization and orthogonal erection of positive 45-degree oblique polarization and negative 45-degree oblique polarization;
and the antenna bracket is used for monitoring the elevation of the antenna.
3. The radar interference signal monitoring and analyzing device according to claim 1, wherein the monitoring host subsystem comprises a monitoring receiver, an interference signal analyzing and processing module and a data storage unit;
the monitoring receiver is used for receiving the radio-frequency radar interference signals transmitted by the monitoring antenna subsystem, processing the radio-frequency signals into intermediate-frequency signals through amplitude limiting, power regulation, filtering and frequency conversion, sampling, quantizing and encoding the intermediate-frequency signals, and outputting baseband data to the interference signal analysis processing module;
the interference signal analysis processing module is used for carrying out digital channelizing, signal detection, pulse descriptor measurement and signal sorting identification processing on the baseband data, generating a radiation source descriptor, uploading the radiation source descriptor to the main control subsystem, and uploading polarization component amplitude information in the baseband data to the main control subsystem;
and the data storage unit is used for storing the original baseband data and the processing result of the interference signal analysis processing module.
4. A radar interference signal monitoring and analyzing device according to claim 3, wherein the monitoring receiver comprises a power supply unit circuit, a control unit circuit, a local oscillator unit circuit, a channel unit circuit, and an AD acquisition unit;
the power supply unit circuit supplies power to the channel unit circuit, the control unit circuit and the local oscillation unit circuit simultaneously;
the control unit circuit sends a channel gating instruction and a power regulation instruction to the channel unit circuit according to the radio frequency radar interference signal input from the outside, sends a local oscillation signal generation instruction to the local oscillation unit circuit and sends a voltage control instruction to the power supply unit circuit;
the local oscillation unit circuit is used for simultaneously providing a local oscillation signal and two local oscillation signals for the channel unit circuit according to the local oscillation signal generation instruction;
the channel unit circuit carries out channel switching gating according to a channel gating instruction, limits the amplitude of the monitored radio frequency signal, carries out power regulation and control of the radio frequency signal according to a power regulation and control instruction, further carries out filtering treatment, receives a local oscillation signal and two local oscillation signals for twice frequency conversion, converts the radio frequency signal into an intermediate frequency signal, further carries out power regulation and control and frequency selection on the intermediate frequency signal, and outputs intermediate frequency signals with different bandwidths;
and the AD acquisition unit is used for carrying out analog-to-digital conversion on the intermediate frequency signal output by the channel unit circuit and processing the intermediate frequency signal into baseband data.
5. The radar interference signal monitoring and analyzing device according to claim 4, wherein the channel element circuit comprises a receiving front end, a frequency conversion module, an intermediate frequency power regulation module and an output frequency selection group; the receiving front end comprises a channel 1 limiter, a channel 2 limiter, a change-over switch, a radio frequency power regulation and control unit and a preselection filter bank;
the channel 1 limiter and the channel 2 limiter are used in a time sharing way, a low-frequency radio frequency signal of a first preset frequency band is input into the channel 1 limiter, and a high-frequency radio frequency signal of a second preset frequency band is input into the channel 2 limiter; the channel 1 limiter and the channel 2 limiter are used in a time sharing way, and the radio frequency signals exceeding a preset power threshold are connected to the change-over switch after being subjected to limiting output; the change-over switch realizes the switch gating of the channel 1 and the channel 2 and outputs the switch gating to the radio frequency power regulation and control unit; the radio frequency power regulation and control unit amplifies or attenuates according to the power of the input radio frequency signal, realizes the power regulation and control of the radio frequency signal, and outputs the power to the preselection filter bank; the preselection filter bank is used for filtering signals outside the monitoring frequency band and outputting the signals to the frequency conversion module;
the frequency conversion module receives the radio frequency signal output by the preselect filter bank and the first local oscillation signal and the second local oscillation signal output by the local oscillation unit circuit, is used for converting the received radio frequency signal into an intermediate frequency signal by twice frequency conversion and outputs the intermediate frequency signal to the intermediate frequency power regulation and control module;
the intermediate frequency power regulation and control module amplifies or attenuates according to the power of the input intermediate frequency signal, realizes the power regulation and control of the intermediate frequency signal, and outputs the intermediate frequency signal to the output frequency selection group;
and the output frequency selecting group performs frequency selection on the received intermediate frequency signals and outputs intermediate frequency signals with different bandwidths to the AD acquisition unit.
6. The radar interference signal monitoring and analyzing device according to claim 4, wherein the interference signal analyzing and processing module comprises an FPGA processing module and a DSP processing module;
the FPGA processing module receives the baseband data output by the AD acquisition unit, caches the baseband data on one hand and sends the baseband data to the DSP processing module, and performs digital channelized processing, signal detection, pulse descriptor measurement and pulse descriptor caching on the baseband data on the other hand and sends the baseband data to the DSP processing module;
on one hand, the DSP processing module receives the pulse description word, generates a radiation source description word after signal sorting and recognition, and uploads the radiation source description word to the main control subsystem, and on the other hand, receives the baseband data, and uploads the waveform or frequency spectrum data and polarization component amplitude information in the baseband data to the main control subsystem.
7. The radar interference signal monitoring and analyzing device according to claim 6, wherein the main control subsystem comprises a signal monitoring and displaying function module, a signal interception function module, a parameter measuring function module, an intra-pulse analysis function module, a signal type analysis function module, a signal acquisition and storage function module and a data playback analysis module;
the signal monitoring display function module is used for realizing panoramic spectrogram display, medium-frequency spectrogram, pulse running water chart, pulse time domain waveform chart, pulse spectrogram and parameter measurement list display;
a signal interception function module for realizing interception under multi-gear adjustable instantaneous working bandwidth;
the parameter measurement function module is used for realizing the measurement of signal arrival time, signal frequency, signal bandwidth, signal amplitude, pulse width, pulse repetition period type, modulation type, polarization mode, suppression interference type and deception interference type;
the intra-pulse analysis function module is used for acquiring intra-pulse time-frequency characteristics and time-phase characteristics of the signals and extracting characteristic envelopes;
the signal type analysis function module is used for obtaining the modulation type, the signal frequency, the signal bandwidth and the polarization mode measured by the parameter measurement function module, measuring the time domain characteristics of the signal, including pulse width, inter-pulse interval and intra-pulse characteristics, and identifying the type of radar interference signals according to the time domain characteristics, the polarization characteristics and the frequency characteristics of the signal;
and the data playback analysis module is used for realizing dynamic playback and static playback of the collected and stored original data.
8. The radar interference signal monitoring and analyzing device according to claim 7, wherein the panoramic spectrogram display realizes a spectrum display of a first preset frequency band and a second preset frequency band;
the intermediate frequency spectrogram displays radar interference signal frequency spectrum and signal bandwidth in the instantaneous bandwidth;
the pulse running water graph displays the signal frequency, the signal amplitude, the pulse width and the pulse repetition period of the monitoring signal in real time in a pulse running water mode;
the pulse time domain waveform diagram shows pulse interval, intra-pulse information and pulse width;
the pulse spectrogram shows the signal frequency, the signal bandwidth and the signal amplitude of the signal;
the parameter measurement list displays various parameters measured by the parameter measurement function module.
9. The radar interference signal monitoring and analyzing device according to claim 7, wherein the signal acquisition and storage function module comprises a full pulse acquisition storage and a trigger acquisition storage;
collecting and storing all signal data by full pulse collecting and storing;
triggering the acquisition and storage to acquire and store the signals exceeding the set level threshold.
10. The radar cross signal monitoring and analysis device of claim 7, wherein the data playback analysis module supports manual measurement of pulse width, inter-pulse spacing, intra-pulse characteristics of the signal during playback to assist in identifying the type of cross signal.
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