CN1924607B - Control Method of High Frequency Radar Receiver with Multiple Working States - Google Patents

Abstract

A control method for a high-frequency radar receiver with multiple working states. In the synchronous controller of the high-frequency radar receiver, different state flags work_state are used to set the value of the working state. In different working states, the radar receives The computer system is set in different working states; a series of timing control signals generated by the synchronous controller are determined by the working state control program. After receiving all valid trigger signals, the program will output the flag according to the reset level and counter value. work_state is set to the current state, the waveform generation part is composed of multiple working states, unwork, initializing are the initialization states generated by synchronous timing, work_1, work_2, ... are the corresponding working states set by the user respectively. The invention enables the radar receiver to work in multiple states, completes multiple tasks, and improves the overall performance of the radar.

Description

Control Method of High Frequency Radar Receiver with Multiple Working States

technical field

The invention relates to a radar synchronous control method, specifically, based on the existing single task timing control technology, the timing control of multiple working states is completed and the corresponding data collection is completed simultaneously.

Background technique

The portable high-frequency ground wave radar marine environment monitoring system is an advanced radar system developed by Wuhan University to detect marine environmental elements such as wind, waves, current fields and low-speed moving targets on the ocean surface. The radar receiver adopts multi-state timing control synchronization control technology , can complete the functions of radar echo signal processing and spectrum data acquisition in one radar working cycle, and provides a feasible solution for the realization of multi-frequency radar, which improves the anti-interference ability of radar and reduces the design cost at the same time .

The radar receiver uses a synchronous controller responsible for the coordination of various components in the system, and provides trigger and timing signals for other components in the system. This system uses a field programmable logic array (FPGA) as a hardware platform for synchronous control. It better satisfies the requirement of real-time and accurate synchronous timing control, and can integrate the functions of other channel control and data transmission. Radar systems require synchronous control signals to be generated with high accuracy, stability and reliability in order to avoid causing phase errors in the system.

A utility model patent of Wuhan University "High Frequency Ground Wave Radar Digital Coherent Receiver" (ZL: 200420057632.3), the radar receiver adopts transceiver co-station, chirp interrupt continuous wave, primary mixing bandpass sampling and digital signal processor Complete multi-channel data processing; it has the advantages of stable performance, simple structure, good system linearity and dynamic stability; but the synchronous controller of the radar can only complete a single working state in one working cycle, and has a single function.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings and deficiencies in the prior art, and provide a control method for a high-frequency radar receiver with multiple working states, thereby realizing flexible configuration of radar working states. Multiple working states can be completed in one working cycle, for example, the working state can be configured as echo processing state and spectrum monitoring state, or the radar system can be configured as a multi-frequency radar system.

The technical solution provided by the present invention is: a control method for a high-frequency radar receiver with multiple working states, which is characterized in that: in the synchronous controller of the high-frequency radar receiver, different state flags work_state are used to set The working state value of the radar receiver system is set in different working states in different working states;

All operations of the waveform generation part are determined by the working state control program. After receiving a valid trigger signal, the program sets the output state flag work_state to the current state value according to the counter value. The working state of the waveform generation part is as follows: unwork, initializing, work_1, work+2, ..., unwork and initializing states are the system initialization states, work_1, work+2, ... are the working states set by the user respectively;

While completing different working states work_1, work+2, ..., the working state parameters are collected and corresponding processing is completed, and the flag header file is added for transmission.

Principle of the present invention is:

The timing signal and its counter value in the synchronous controller are flexibly used, and the jump of the working state is realized by setting the counter value and its state, and a complete state jump is completed in each working cycle of the radar, except for system initialization. In addition to the required unwork and initializing states, work_1, work_2, ... are all working states set by the user.

When the input reset signal RESET is high level, the waveform generation part is in the unwork state, and the state control program recognizes that the work_state is unwork, clears all internal registers and counters, and resets the synchronization control program. When the input reset signal is low level , the counter tempo of the working state control program is enabled and starts counting at the same time. According to different count values, the output work_state outputs the remaining working states.

The state initializing is the time period reserved for the initialization of the waveform generation part. At this stage, the initialization state control program starts to work, and the synchronization control program reads the waveform parameters cyclically from the dual-port RAM and sends them to the corresponding registers.

When the waveform generation part is in the working state of work_1, assuming that the state of work_1 is the normal working state of the radar system, at this time, the state control program for calculating and comparing the output waveform starts to work, outputting a series of timing pulses and interrupt request control signals, such as gating pulses signal (TP), ground wave signal (BGW), radar signal source trigger signal (RFUpdate), radar local oscillator source trigger signal (LOUpdate) and other timing trigger signals required for the normal operation of the radar, and at the same time generate a series of data acquisition required Timing signals, such as sampling signal (ADCLK), sampling trigger interrupt request signal (Framel), etc. After the digital signal processor (DSP) responds to the interrupt request, it completes the data acquisition of the intermediate frequency signal, and completes the digital down-conversion, fast Fourier Operation and other processing, work_1 can also be set to the corresponding working state according to user requirements.

When the waveform generation part is in the working state of work_2, it is assumed that the working state of work_2 is the working state of the radar system for spectrum detection. At this time, the synchronization control outputs the corresponding timing control signal as required, such as setting the radar gate control signal TP to zero and generating an interrupt at the same time Request signal, reset the radar signal source to stop output, change the frequency parameters of the local oscillator signal source and trigger the work at the same time, the external noise signal and the local oscillator signal are mixed to obtain an intermediate frequency signal, and sample it, and the sampling trigger at this time The interrupt signal (Frame2) is used as the interrupt request signal for the DSP to receive the working state 2, and the DSP responds to the interrupt request, and completes the data collection and processing of the working state 2 according to the interrupt service program set by the user.

By analogy, if the user sets more working states, the user can set the corresponding working state program according to the requirements.

The invention utilizes the configurability of the timing control state of the synchronous controller to flexibly configure the working state of the radar receiver. The system uses timing pulses and setting counter values to determine the jump of the working state. When the working state program jumps to the working state set by the user, the synchronous control program will generate a series of timing pulse signals and corresponding interrupt requests. The signal is used to control the frequency source module, data acquisition module and data transmission module of the radar system, so that they can work in harmony to meet the tasks set by the user.

The synchronous controller of the radar receiver of the present invention adopts the Field Programmable Logic Array (FPGA) to complete the control of all modules, when the system is powered on and initialized, the counter value and the register value are cleared, and the waveform parameters are downloaded to the synchronous in the dual-port RAM of the controller. At this time, the working state of the synchronous control is the unwork state. After the parameters are downloaded, enter the initializing working state, clear the counter tempo, and start counting. At this time, the synchronous control program will read the waveform parameters from the dual-port RAM and send them to the working register. . When the state control program jumps to the normal working stage, a series of timing control signals and interrupt request signals are generated, and the system will run according to the workflow set by the user. When a complete working cycle is over, the synchronous control program will Entering the next working cycle, since the system has not been powered off at this time, there is no need to complete the system power-on initialization, then enter the initializing working state, clear the tempo, and restart counting, and complete the working state of the second working cycle.

The present invention has following advantage and positive effect:

Utilizing the working mechanism of radar synchronous state control, the original single-state, single-task synchronous control structure is improved, and the number of working states is increased, so that the radar system can complete more tasks in one working cycle. Some interrupt clearing signals are added to the state control program of each working state, so that the rest of the working modules respond to their respective interrupt requests to distinguish and do corresponding signal processing, which expands the functions of the radar system.

Description of drawings

Fig. 1 is the working state control flowchart in the synchronous control procedure of the embodiment of the present invention;

Figure 2 is a block diagram of the system structure of the high-frequency radar;

Fig. 3 is a working block diagram of the synchronous controller of the high-frequency radar system.

Among them: 1-radar frequency source working module 2-radar transmitting module 3-synchronous controller working module

4-Echo receiving and data processing module 5-Master control computer 6-Radar signal source trigger signal

7-Radar local oscillator trigger signal 8-Working state 1 interrupt request signal

9-Working state 2 interrupt request signal 10-Working state N interrupt request signal

11-sampling clock signal 12-ground pressure wave signal 13-data acquisition working status 1 interrupt request signal

14-Data acquisition working state 2 interrupt request signal 15-Data acquisition working state N interrupt request signal

16-Download the waveform parameters of synchronous control 17-Upload the processing results to the main control computer

18-Radar launch channel 19-Radar launch wave 20-Radar target echo

21-Dual-port RAM working module 22-Frequency division working module 23-Main control program module

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the timing pulse signal is the timing reference signal in the synchronous control program, which is used for the system timing counting pulse signal. When the system starts to work, when the system detects the arrival of the rising edge of each timing pulse signal, the counter tempo The value of the value is increased by 1, and the counter value is compared with the preset state jump critical value. As shown in the figure, when the count value is less than the critical value, the current working state program will continue to be executed. If the count value is greater than or equal to the critical value value, the state control program will jump to the next working state and execute in turn until all working states are executed, and when the critical value of the last working state is reached, a complete working cycle is completed and the next working cycle is entered , the counter value tempo is cleared and counted again.

Figure 2 shows the frame structure diagram of the radar system. As shown in the figure, the system consists of a synchronous control module, a radar signal source module, a radar echo data acquisition and processing module, a transceiver antenna system and a main control computer. When the radar After the synchronization controller completes the system initialization, the synchronization controller outputs a series of timing control pulses to make the radar system start to work. For example, when the working state 1 (work_1) is defined as the radar echo processing state, the synchronization controller outputs the frequency source Interrupt request signal, the radar signal source responds to the interrupt request, so that the radar signal source starts to work, in order to make the transmit signal output by the radar signal source and the local oscillator signal have a strict initial phase, the transmit signal source and the local oscillator signal are both controlled by the same signal Trigger work; working state 2 (work_2) can work according to the working state set by the user. When the state jumps to working state 2, the interrupt service program responds to the interrupt according to the signal source set by the user, sets the signal source output, and then The signal is triggered by the signal source to make it work. The same synchronous control provides the sampling pulse signal and a series of other timing control signals for the data acquisition module in state 1 and state 2, ... state N, for example, when the state control program jumps to work In state 1, the control program will generate an interrupt request signal 12 and provide it to the sampling processing module. After the module responds to the interrupt, it will complete the corresponding data collection and data processing according to the interrupt service program set by the user. Also in the working state 2 , the user can set the corresponding interrupt service program 2 to complete the data collection and processing of the state 2, the working state 3, ... the working state N can work according to the program set by the user.

Attached Figure 3 shows the basic components of the synchronous controller, which is mainly composed of a dual-port RAM module, a waveform generation module and a timing pulse generation module. The timing pulse generation module is used to divide the input clock of the synchronous controller , to obtain a series of timing signals to provide timing pulses for the waveform generation module. The control word of the waveform parameters is stored in the dual-port RAM working module. When the system is powered on and initialized, the waveform parameters are downloaded to the dual-port RAM of the synchronous controller. When the synchronous controller starts to execute, the waveform parameters are downloaded from the dual-port RAM is read into a series of registers. It is used for waveform generation; the waveform generation module is the main working module of the synchronous controller, which mainly completes the counting of timing pulses, the comparison between the counting value and the preset state parameters, and the jump of the working state.

The core of the present invention is to expand the original single-task, single-state radar system into a multi-task, multi-state radar system, so that the radar can complete more work tasks in one working cycle, and users can set The radar system is configured as a high-frequency radar receiver with spectrum detection and a multi-frequency radar system. The function of the radar is expanded, and the anti-jamming ability of the radar is improved, and at the same time, there is no need to increase hardware equipment, and the design cost is reduced.

Claims (1)

1. the control method of the high-frequency radar receiver of multiple working conditions, it is characterized in that: in the isochronous controller of high-frequency radar receiver, adopted different Status Flag work_state to be changed to residing operation state values, made the radar receiver system finish different tasks in different duties;

The all operations that part takes place waveform is determined by the duty control program, this program is after receiving effective trigger signals, according to Counter Value, work_state is changed to the present located state value with the output state sign, the duty that part takes place waveform is as follows: unwork, initializing, t_work_1, t_work_2, t_work_n, wherein n is a positive integer, unwork and initializing state are the system initialization state, t_work_1, t_work_2 ..., t_work_n is respectively the duty that the user sets;

Finish different duty t_work_1, t_work_2 ..., in the time of t_work_n, corresponding processing is gathered and finished to its working status parameter, and indicated that header file transmits.

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