CN102590792A - L-wave-band shore-based sea clutter observation system based on vector network analyzer - Google Patents
L-wave-band shore-based sea clutter observation system based on vector network analyzer Download PDFInfo
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Abstract
The invention discloses an L-wave-band shore-based sea clutter observation system based on a vector network analyzer. The system comprises the vector network analyzer, a power amplifier, a low noise amplifier, a transmit-receive antenna and a master control computer. The vector network analyzer is transmit-receive signal equipment and is used to emit a frequency-stepping continuous wave signal with a specified parameter under control of the master control computer. After being amplified by the power amplifier, the signal is radiated to a sea area to be measured through the transmit-receive antenna. An echo signal is received by the transmit-receive antenna and enters into the vector network analyzer after a signal-to-clutter ratio is increased through the low noise amplifier. The vector network analyzer is also used to arrange a proper intermediate-frequency bandwidth under the control of the master control computer and carries out time domain windowing, calculation and processing to the echo signal. Sea clutter data can be obtained. By using the technical scheme of the invention, long distance detection can be performed under low radiation power; the detection with a small grazing angle and high resolution can be realized; system performance is stable and an automation degree is high.
Description
Technical field
The present invention relates to the radar clutter technical field of measurement and test, relate in particular to a kind of L-band bank base sea clutter recording geometry based on vector network analyzer.
Background technology
The sea background clutter is the principal element that influence and the particularly low elevation angle of restriction radar detection radar, airborne and spaceborne head-down radar target detection performance are brought into play.The extra large clutter that causes owing to the ANOMALOUS VARIATIONS on sea in the land-sea interface zone can cause radar false alarm to increase greatly.Measurement result to the understanding of extra large clutter need be collected under the abundant various parameter conditions is analysed in depth.
In order to develop advanced capabilities radar; Improve the target detection ability; Begin from five sixties of eighties of last century; The extra large clutter that various countries utilize vehicle-mounted scatterometer, airborne radar and land-based radar system to carry out under various ways, multiband and the particular surroundings is measured, and carries out the researchs such as statistical property of extra large clutter.After the nineties, along with the variation with military requirement that develops rapidly of airborne radar, a lot of clutter surveying works are more pointed, and the clutter measurement means also is tending towards variation, and to multiband, little grazing angle, the expansion of high range resolution.Mostly state's inland sea clutter theoretical research is simulation calculation in view of the support that lacks effective experimental data, and extra large clutter modeling accuracy is not high, and the engineering practicability of achievement in research is relatively poor.Experiment measuring comprises that the bank base is measured and airborne radar is measured, and airborne measurement receives the restriction in Measuring Time place, and measuring data sample is few, and measurement result difference is also very big, and systematicness is not enough.In view of lacking observation method, less based on the research work of measured data, the extra large clutter long-term observation platform that is the basis with the bank based platform and based on the applied research of the extra large clutter mean value model of measured data all also is in the starting stage.Particularly in recent years owing to the appearance of stealthy target and low latitude ultra-low altitude penetration, the research of little grazing angle and high resolving power sea clutter becomes an important directions, and owing to lack effective observation method, little grazing angle, high resolving power sea clutter data lack relatively.
According to the difference of the form of transmitting, Clutter Measurement Radar has different systems, and continuous wave is a basic configuration, but owing to do not modulate, so can't confirm distance.Pulsed radar is confirmed range information through the time delay of measuring between transponder pulse and received pulse, but emissive power is bigger.The frequency step radar utilizes signal source emission jump frequency to substitute frequency sweep mode, can increase range resolution, and shortcoming is to increase the complicacy of signal source and the stability requirement of whole bandwidth inner part.
In addition, set up bank base sea clutter long-established station and can on mountain top of bordering on the sea or high platform, build, but relate to engineering construction problems such as civil engineering, water power, the cycle of building a station is long and cost is higher, implements difficulty relatively.In addition can be on nearby skyscraper of sea, setting up, through on-the-spot investigation, the suitable high building roof of the condition of choosing can be simplified many problems on the engineering construction greatly as setting for this platform, and shortcoming is that radiation power can produce radiation pollution to surrounding environment when big.So under assurance radar performance prerequisite, also need reduce radiation on every side, promptly test macro should keep detection range far away, possesses less emissive power again as far as possible.And long-term observation also has higher requirements to aspects such as test macro stability, automaticities.
Summary of the invention
The technical matters that the present invention will solve provides a kind of L-band bank base sea clutter recording geometry based on vector network analyzer, and this system can carry out long-range detection under low radiation power, realize little grazing angle high-resolution detection.
For solving the problems of the technologies described above, the present invention is based on the L-band bank base sea clutter recording geometry of vector network analyzer, mainly comprise vector network analyzer, power amplifier, low noise amplifier, dual-mode antenna and main control computer;
Wherein, Said vector network analyzer is a signal sending and receiving equipment; Be used under said main control computer control, producing the frequency step continuous wave signal of designated parameter, this signal is radiated zone, sea to be measured through said dual-mode antenna after said power amplifier amplifies; Echoed signal receives through said dual-mode antenna; And through getting into said vector network analyzer after the said low noise amplifier raising signal to noise ratio; Said vector network analyzer also is used under main control computer control, suitable intermediate-frequency bandwidth being set; And echoed signal carried out obtaining extra large clutter data after time-domain windowed and the computing, main control computer writes down, analyzes and manage the extra large clutter data that obtain.
Further, said vector network analyzer possesses signal and transmits and receives function, and wherein, the intermediate frequency of said vector network analyzer (IF) bandwidth is confirmed as follows:
Calculate maximum measuring distance according to transmitted signal bandwidth with counting, confirm the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure;
More than count and the corresponding different scanning time of the various combination in twos of intermediate-frequency bandwidth, find out and satisfy sweep time less than 1/4 wave corresponding intermediate-frequency bandwidth during the cycle, as the intermediate-frequency bandwidth of said vector network analyzer.
Further; Said dual-mode antenna separates and all adopts single-offset parabolic reflector antenna, antenna mount alternate orientation-pitching type turntable type mounting, and azimuth rotating platform forms tray type structure by constructed of aluminium spare; Its upper end connects the pitching part with bolt; The lower end links to each other with the antenna mounting platform with bolt, and the pitching driving box places the pitching cylinder interior, is output as an annular wheel that links to each other with cylinder.
Further; Orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor; In order to drive orientation, pitch axis rotation, select for use sine and cosine resolver to be installed in respectively on azimuth axis of antenna, the pitch axis, in order to little change of sensed orientation, luffing angle; Orientation, pitch axis are to the hardware limit device is housed respectively.
Further; Main control computer also is used for through the measure batch parameter is set; Setting measurement order also is provided with fault recovery and handles and realize that extra large clutter measures automatically; Automatically the measurement parameter setting comprise the repeatedly duplicate measurements of same parameter, same parameter measurement in the same time period, in the same time period different parameters measure and above three kinds of patterns under multiple measurement; And after verification, deposit measurement parameter in automatic measurement parameter file, and measure the back measurement data that finishes and put in storage automatically, artificial warehouse-in mode is provided simultaneously.
Further, main control computer also is used for adopting the multi-thread programming technology through the running of ethernet line Long-distance Control scope, utilizes hub and communication server to control respectively and vows that network parameters setting and antenna rotate, launch and collection.
Further, said main control computer also comprises data analysis module, and said data analysis module is used to combine ocean environment parameter that said extra large clutter data are analyzed, and comprises mean value model coupling and amplitude distribution match.
Further, the L-band bank base sea clutter recording geometry based on vector network analyzer according to the invention also comprises power amplifier monitoring means and temperature monitoring unit; Wherein, said power amplifier monitoring means is used to monitor through transmitting after the said power amplifier processing; Said temperature monitoring unit is used to detect the working temperature of rack.
Further, said vector network analyzer adopts UPS (uninterrupted power source) power supply, and said power amplifier adopts the switching power supply power supply, and said power amplifier monitoring means and temperature monitoring unit adopt the Switching Power Supply power supply.
Further, the L-band bank base sea clutter recording geometry based on vector network analyzer according to the invention also comprises supervisory computer, and said supervisory computer is kept watch on the rotary state of said dual-mode antenna through camera, and keeps watch on sea state.
The present invention has broken through gordian techniquies such as the clutter observation of frequency step continuous wave system bank base sea, the automatic measurement of extra large clutter; Utilize the long-term Continuous Observation of the deployable extra large clutter bank based platform of the present invention; Be extra large noise performance research accumulation mass data; Especially the clutter data in land-sea interface zone, and then for radar system designs, signal Processing provides theory support and technical support with target detection.Compared with prior art, the present invention has following beneficial effect:
1, the present invention adopts frequency step continuous wave system to make up bank base L-band sea clutter long-term observation system; Utilize vector network analyzer (be called for short and vow net) as R-T unit, consider the method for sweep time and measure dot number, can under low emissive power, keep detection range far away through reducing intermediate-frequency bandwidth and compromise; Can be in little grazing angle work; And have the high-resolution less than 1m, system performance is stable, measures for a long time thereby be easy to launch the bank base; Obtain combining the L-band high resolving power sea clutter data of land-sea interface zone marine environment characteristics, be used for researchs such as clutter statistical characteristics, mean value model applicability.
2, the Long-distance Control and the supervision of equipment have been realized.Through the reasonable disposition equipment interface, only need an ethernet line to realize that main control computer is to scope and circuit control.Adopt many interfaces and multi-thread programming technology, realized the co-ordination and the equipment state of opertaing device are kept watch on.
3, the automatic measurement of extra large clutter and effectively management have been realized.The software active data storage format, Parameter File configuration mode, mode of operation and logical operation, the design error failure restore funcitons has been realized the automatic observation of extra large clutter.Possess functions such as correlation inquiry to extra large clutter data and marine environment data, interpolation, deletion, backup, demonstration; Improved data-handling efficiency; And be provided with the data analysis module of mean value model coupling and amplitude distribution match, for noise performance in-depth analysis and data selection reference is provided intuitively.
Description of drawings
Fig. 1 (A) is the radiation power estimation area synoptic diagram of the embodiment of the invention;
Fig. 1 (B) is the radiation power estimation density synoptic diagram of the embodiment of the invention;
Fig. 2 is the system software workflow synoptic diagram of the embodiment of the invention;
Fig. 3 is the software design block diagram of the embodiment of the invention;
Fig. 4 watches the subsystem fundamental diagram for the sky of the embodiment of the invention;
Fig. 5 is the data processing subsystem principle of work and the connection layout of the embodiment of the invention;
Fig. 6 is that the breakpoint of the embodiment of the invention recovers the incident schematic flow sheet;
Fig. 7 is the automatic warehouse-in schematic flow sheet of the embodiment of the invention;
Fig. 8 is the manual work warehouse-in schematic flow sheet of the embodiment of the invention;
Fig. 9 is the extra large clutter data processing and the analysis process figure of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, does not limit the present invention.
The present invention utilizes frequency step continuous wave system; Adopt narrower intermediate-frequency bandwidth to reduce noise gate; Improve dynamic range; Under the prerequisite that keeps the long-range detection performance, reduce emissive power, utilize broadband saltus step waveform to obtain high range resolution, thereby realize the little grazing angle high resolving power detection of bank base.
The present invention is based on and vow that net makes up, the frequency step continuous wave signal under the designated parameter can be launched in the built-in signal source, and stable performance.The L-band bank base sea clutter recording geometry that the present invention is based on vector network analyzer mainly is made up of antenna servo subsystem, data processing subsystem two large divisions.It is watched subsystem and comprises dual-mode antenna, antenna mount unit, servosystem and connection cable etc.Dual-mode antenna comprises single biasing reflecting surface, feed support and feed; The antenna mount unit comprises orientation combination and pitching combination; Servosystem comprises antenna control unit and antenna driver element; Connection cable comprises servocontrol cable and the signal cable between antenna control unit and the antenna driver element between antenna control unit and antenna driver element and the antenna mount.Data processing subsystem comprises transceiver, control and DAF.Transceiver comprises vows net, power amplifier, low noise amplifier, amplifier power supply, uninterrupted power source UPS, Switching Power Supply, polarization switch, hub, communication server, power amplifier and temperature monitoring unit, switch drive unit, microwave cable etc.Control comprises main control computer, supervisory computer, data-carrier store etc. with DAF.
The L-band bank base sea clutter recording geometry groundwork flow process that the present invention is based on vector network analyzer is: vow that net receives the parameter setting of system software in the main control computer; Frequency step continuous wave signal under the emission designated parameter; Vow the signal source emission jump frequency in the net; Frequency increases progressively by Δ f (frequency interval) at interval, and the total bandwidth that transmits B=N * Δ f (N is the discrete frequency number) utilizes broadband saltus step waveform can obtain high range resolution.Power amplifier amplifies the back with signal and is radiated zone, sea to be measured through emitting antenna; Adopt the transmitting-receiving separate antenna, increase isolation between transceiver channel to the 50dB, the dual-mode antenna main beam is aimed at zone to be measured; Echoed signal is passed through low noise amplifier through receiving antenna; Low noise amplifier amplifies faint echoed signal, improves signal to noise ratio, and the saturated function of strong signal of low noise amplifier plays a protective role to vowing the net receiver simultaneously.Get into behind the letter after the amplification and vow net, under the main control computer control suitable intermediate-frequency bandwidth is being set and echo data is carried out obtaining extra large clutter data after spatial transform and the processing.Main control computer record, the extra large clutter data of analyzing and managing collection.The expansion of dual-mode antenna in the course of the work, collection, orientation, pitch rotation are realized by main control computer Long-distance Control control servosystem.Main control computer is monitored temperature in power amplifier state, the rack, control polarization switch in real time.Supervisory computer is kept watch on the antenna rotary state through camera, and the human intervention measure that is in an emergency can further guarantee antenna equipment safety, monitors sea state simultaneously.Only be connected between scope and the main control computer with an ethernet line; Be beneficial to the Long-distance Control wiring; Through hub and communication server, utilize the multi-thread programming technology then, control respectively vowing parts such as net, servosystem, monitoring means, polarization switch; The real-time acquisition and display signal, and keep watch on each equipment running status.
The land clutter measurement is compared in sea clutter measurement needs farther detection range.Utilize formula (1) estimation detection performance, maximum detectable range is:
Wherein: P
tThe expression emissive power;
G
2Expression round trip radar antenna gain;
G
2 fExpression round trip antenna direction sex factor;
Λ representes wavelength;
σ
0The expression backscattering coefficient;
φ
aExpression antenna bearingt beam angle;
φ
bExpression antenna pitching beam angle;
S
MinExpression receiver minimum detectable level;
SNR
MinRepresent minimum signal to noise ratio;
L representes two-way radar system loss.
Be the radiation pollution that reduces to bring to surrounding environment, can not excessive increase emissive power, the present invention promptly reduces the detection range that the minimum detectable level improves radar through the receiver sensitivity that improves radar system.According to the principle of work of vowing net, through reducing the intermediate-frequency bandwidth of system, reduce background noise, and then improve receiver sensitivity.
Reduce intermediate-frequency bandwidth on the other hand and will increase and vow and net sweep time to be authenticity and the validity of guaranteeing extra large clutter measurement data, compromise is considered between intermediate-frequency bandwidth, sweep time and measure dot number, selection of parameter according to the following steps:
1) at first calculates maximum measuring distance with counting, confirm the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure according to transmitted signal bandwidth.
2) count more than and the corresponding different scanning time of the various combination in twos of intermediate-frequency bandwidth, find out and satisfy sweep time less than 1/4 wave corresponding intermediate-frequency bandwidth parameter during the cycle.
But the reality measuring distance can add that time delay, influence obtained according to the IF bandwidth parameter.With radar power frequency rate 1.35GHz, bandwidth 200MHz, wave cycle 3.9s, receiver IF bandwidth 2kHz～20kHz is an example, corresponding actual maximum measuring distance is 1.2～6.6km.
Take following measure for increasing detection range to vowing net in addition: take measure reduction receiver noise level such as average, level and smooth; Delete useless trace, break off useless mark, break off some additional functions such as limit test function, simultaneously through close vow net demonstration to improve sweep velocity.
Utilize formula (2) to carry out the radiation power estimation; Certain test platform of having used with reality of the present invention is an example, little grazing angle work, 1.4 ° of radar beam nutations; The high 90m of platform; Land-sea interface place and the about 1.5km of platform horizontal range, emissive power is 90W, estimation area and estimation radiosity are as shown in Figure 1.The result can find out that radiation power is 0.012W/m to the maximum from estimation
2, much smaller than national Electromagnetic Radiation Standards 0.4W/m
2
Wherein: P
tBe transmitting antenna power, G
tBe transmitter antenna gain (dBi), G
fBe the emitting antenna directional factors, R is any distance of a bit, and D be the more any power density apart from radar R rice distant place.
When realizing that remote little grazing angle is surveyed, utilize broadband waveform realization high-resolution, vow that net response resolution has different corresponding relations with frequency span, window between selecting, be inverse ratio with the survey frequency span, change along with the window difference.Select tape of the present invention is logical to be impacted, measure for round trip, and bandwidth 200MHz, minimum resolution can reach [1/2 * (1.20/ band width)] * light velocity=0.9m.
For guaranteeing that extra large clutter long-term observation carries out in order, the present invention designs autorun, is realized by main control computer control.Built-in system software is the tie of connected system each several part function, and software workflow is as shown in Figure 2, and after the startup, at first the Long-distance Control antenna turns to azimuth pitch angle to be measured, then is provided with to vow the net correlation parameter, and controlling transmits carries out the clutter measurement.Echoed signal shows that with the form of frequency domain figure control vows that net carries out data conversion then, calculates the back through handled and shows the scattering coefficient figure, stores the clutter data at last and imports database.In the clutter measuring process, show the power amplifier condition curve in real time, but whether the work of artificial judgment power amplifier is normal on the one hand, reduces by of the influence of power amplifier instability through measures such as data fittings on the other hand the clutter measurement.Harvester in-cabinet temperature simultaneously, and be shown in software master interface in time takes measures necessary to solve with the working temperature of convenient rack when too high.System software is made up of extra large clutter observation control and data acquisition module, data management module, system management module, data analysis module.Design framework is as shown in Figure 3.
Below in conjunction with accompanying drawing, the antenna servo subsystem (be called for short the sky and watch subsystem) and the data processing subsystem of the L-band bank base sea clutter recording geometry that the present invention is based on vector network analyzer explained further details.
1) subsystem is watched in the sky
It is watched subsystem and comprises dual-mode antenna, antenna mount unit, servosystem and connection cable etc.Antenna is accomplished to the emission of polarized signal and to the reception from the linear polarization signal in space; The antenna mount unit is that antenna provides installed platform; Servosystem is gathered information such as antenna bearingt, pitching shaft angle, rotates according to exterior guiding instruction or this control operation driven antenna mounting, changes controlling antenna wave beam to point; Connection cable comprises servocontrol cable and the compositions such as signal cable between antenna control unit and the antenna driver element between antenna control unit and antenna driver element and the antenna mount.
Above-mentioned dual-mode antenna is made up of single offset parabola reflecting body, feed support, Feed Horn.Reflecting body is made up of reflecting surface and back of the body frame.The feed support adopts the ladder-shaped support structure.Feed adopts square loudspeaker, and horn feed can reach and mate preferably and isolate.
Above-mentioned antenna mount unit alternate orientation-pitching type turntable type mounting.Azimuth axis adopts the traffic cycle form, can ± 180 ° of rotations.The pitching drive system places on the orientation rotating disk, and relatively independent, the compact conformation of moving, axial dimension are little, are convenient to work, storage and transportation etc.
The orientation part by azimuth rotating platform, bearing, orientation synchronously, orientation support etc. forms; The weight of entire antenna passes to the chassis, orientation by azimuth rotating platform through bearing; The chassis, orientation is installed on the orientation support that is welded into body structure, is fixed at last on the antenna mounting platform.Azimuth rotating platform forms tray type structure by special processing constructed of aluminium spare, and its upper end connects the pitching part with bolt, and the lower end links to each other with the antenna mounting platform with bolt.This version can't see parts such as the orientation drives, the orientation is synchronous, profile is simple and direct attractive in appearance, only is a disk.Pitching part partly is made up of pitching cylinder, pitching bearing, pitching driving etc., and the pitching driving box places cylinder interior, is output as the annular wheel that links to each other with cylinder, and cylinder is then only seen in the outside, and profile is succinct.Antenna system is equipped with the hardware limit device in addition, guarantees the safe and reliable of antenna movement.
Above-mentioned servosystem is made up of antenna control unit and antenna driver element, and peripheral relevant auxiliary element comprises angular transducer, driving element, safety guard etc.The shaft angle sensitive element revolves the change transmitter for the binary channels sine and cosine; Sine and cosine revolved become that to carry out 400Hz excitatory; The output of its sine, cosine winding is sinusoidal wave after R, C phase shift, and sinusoidal wave phase place and corner are proportional, becomes digital quantity to corner through a cover phase discriminator and software programming.Orientation and pitching driving element are selected frequency control, threephase asynchronous for use, can satisfy the requirement of outwork environmental baseline.
It is as shown in Figure 4 that it watches the system works principle, and antenna control unit is the servocontrol core, through the action of control antenna driver element, accomplishes various antennas and drive function; The antenna driver element is that orientation drive motor and pitching drive motor provide power, and driven antenna is rotated; Orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor, in order to drive orientation, pitch axis rotation; Select for use sine and cosine resolver to be installed in respectively on azimuth axis of antenna, the pitch axis, in order to little change of sensed orientation, luffing angle; Orientation, pitch axis guarantee the safe and reliable of motion to safety guard such as hardware limit also is housed respectively; Antenna control unit is through RS-485 bus and main control computer communication.
2) data processing subsystem
Data processing subsystem comprises parts such as vowing net, power amplifier, low noise amplifier, amplifier power supply, UPS, Switching Power Supply, polarization switch, hub, communication server, power amplifier monitoring means, temperature monitoring unit, switch drive unit, main control computer, and is as shown in Figure 5.
Above-mentioned arrow net is selected Agilent PNA series network analyzer E8362B for use, and test signal is converted to time domain, through the echoed signal windowing in the distance range that hope is obtained, removes the interference of ambient noise signal, improves signal to noise ratio (S/N ratio); To receive signal and be directly connected to arrow net front panel wire jumper, and reduce minimum received signal power level, the dynamic range of net is vowed in expansion.Utilize the signal source of vowing that net is inner integrated, can satisfy transmits is provided with demand.
Above-mentioned each ingredient is taked different power supply modes, to the amplifier power supply of power amplifier configure dedicated, selects DHD3 type switching power supply for use; Be the Switching Power Supply of constant voltage mode, totally three tunnel outputs make each road output separate; Do not interfere with each other, and electrical isolation.Adopt UPS to aim at and vow the net power supply,, guarantee under powering-off state, to vow more than net work half an hour through increasing by a Battery pack, so that the staff takes urgent measure, protection arrow net to greatest extent.Adopting Switching Power Supply is that power amplifier monitoring means, temperature monitoring unit and switch drive unit power up, and also powers up to low noise amplifier simultaneously.
Above-mentioned polarization switch adopts the wide band switching of single-pole double-throw (SPDT) coaxial fitting.Power amplifier data monitoring circuit board, polarization switch drive circuit board are packaged in the control enclosure of a sealing.
Above-mentioned hub and main control computer, the communication server and vowing between net is connected through ethernet line; Between power amplifier and the emitting antenna termination two long microwave cables be used for emission, with the H that adapts to emitting antenna and two polarization of V; Signal receiving end uses low loss cable; Between polarization switch and the low noise amplifier, between low noise amplifier and the arrow net receiving port, between the different polarization of polarization switch and vow and adopt all between net emission port and the power amplifier input port that the microwave cable of weak point is connected that the microwave cable is selected low-loss for use, had the cable of filter function with the receiving antenna feed.
Net emission specification signal is vowed in main control computer control, is transferred to emitting antenna through power amplifier amplifying emission signal through low loss cable; Echoed signal receives through dual-mode antenna; And through getting into vector network analyzer after the low noise amplifier raising signal to noise ratio; Vector network analyzer is provided with suitable intermediate-frequency bandwidth under main control computer control; And echoed signal carried out obtaining extra large clutter data after time-domain windowed and the computing, main control computer writes down, analyzes and manage the extra large clutter data that obtain, and accomplishes the once task of receiving and dispatching.Simultaneously, one road signal that is coupled out that transmits of ingoing power amplifier passes to main control computer through the power amplifier monitoring means with monitoring result, and real time monitoring transmits.Through the working temperature of temperature monitoring unit monitoring rack, in time take measures necessary to solve when too high with the working temperature of convenient rack.
Main control computer is through the running of ethernet line Long-distance Control scope; Employing multi-thread programming technology; Utilize hub and communication server to control respectively and vow that network parameters setting and antenna rotate, launch and collection, and monitor temperature in power amplifier state, the rack in real time, the control polarization switch.
Main control computer built-in system software is divided into control and data acquisition, data management, data analysis and four modules of system management, explains further details in the face of each module of system software down.
A) control and data acquisition module
The control of main completion antenna servo and arrow netting index are according to collection.At first, as required antenna is turned to appointed positions, and the state of real time monitoring antenna servo, guarantee the instrument operate as normal.Then, Long-distance Control is vowed net work, preserves the data in the measuring process, after to the data processing of gathering, deposits file in.
The present invention measures and real-time shows signal state through the measure batch parameter is set automatically, and record is the storage data also.Because the parameter numerous (polarization, angle, bandwidth, measuring distances etc.) that the Radar Sea clutter is measured, relate to antenna and rotate with radar parameter and choose, so the batch processing parameter, setting measurement order and complete fault recovery function is set.Automatically the measurement parameter setting comprise the repeatedly duplicate measurements of same parameter, same parameter measurement in the same time period, in the same time period different parameters measure and above three kinds of patterns under multiple measurement; Preserve the measuring task parameter; The parameter that is provided with is presented in the list control; Can add the parameter that is provided with, deletion action, the parameter of setting deposits automatic measurement parameter file in after verification, measure the back measurement data that finishes and put in storage automatically.
For guaranteeing each integrality of measuring, the breakpoint restore funcitons is set, the flow process of its incident is as shown in Figure 6.It is in the process of measuring automatically that breakpoint recovers, for some reason (power down, computer corruption, system crash etc.) cause normal measuring process automatically to be interrupted, must restarting systems after, could continue measurement normally.At first read after the start-up system and measure the recorded information that the last success of journal file is measured; That reads the parameter configuration files arrangement then needs measurement parameter for the last time, and both compare, if information is identical; When then explanation went wrong, arrangement needed the task of test to accomplish; If inequality, then continue to measure, thereby realize the breakpoint restore funcitons from breakpoint.
B) data management module
Mass data to measuring is effectively managed, and helps to improve the efficient that late time data is analyzed.The present invention has designed data management module; Adopt ADO (the Active Data Object) database technology of Microsoft; With Microsoft Access as background data base; Manage extra large clutter sampled data and corresponding radar state parameter, weather conditions data etc., comprise data information managements such as database maintenance, radar state and meteorology, test data management etc.
Warehouse-in for data provides functions such as automatic warehouse-in, artificial warehouse-in, inquiry, modification, increase, deletion, and wherein the treatment scheme of warehouse-in is as shown in Figure 7 automatically, and the treatment scheme of artificial warehouse-in is as shown in Figure 8; In order to guarantee the safety of database; Attribute (the start-up system for example that backup is provided, has recovered, be provided with database password and database is set; Change the attribute of database into and show and read-write, log off, change the attribute of database into and hide with read-only) etc. function.
C) data analysis
Data to test are carried out basic data analysis, and helping provides reference for concrete the application.Data analysis module has combined the ocean environment parameter data, is implemented in further analyzing and processing on the extra large clutter data observation basis, comprises mean value model coupling and amplitude distribution match two parts.The practical implementation process is a gray-scale map when at first the extra large clutter data of different bandwidth being drawn sky; In gray-scale map, extract the higher zone of signal to noise ratio; Get rid of unusual strong point signal and strong point movable signal, analyze scattering coefficient average characteristics and and amplitude statistics distribution character.The average characteristics analysis comprises draws scattering coefficient with the grazing angle change curve, comprises each quantile value, and scattering coefficient average and typical average scattering coefficient model are mated, for example GIT model, TSC model etc.The same range gate Continuous Observation of a certain angle data are selected in the amplitude statistics analysis; Estimate like multiple distributed model parameters such as rayleigh distributed, lognormal distribution, Weibull distribution and K distributions; And with the parameter drafting statistical distribution histogram of estimating; Provide fitting result chart, the Y coordinate axis shows with logarithmic scale.Treatment scheme is as shown in Figure 9.This module mainly is the realization of theoretical algorithm, so adopt the way of realization of class, the whole bag of tricks of data analysis is accomplished with class members's functional form.
D) system management
System management comprises that subscriber information management and system are provided with two parts.Subscriber information management is that different users distributes different rights of using.Mainly be divided into two grades to the user, system manager and general user are provided with different authorities respectively.System is provided with the configuration that function comprises system path, the configuration of measurement pattern, the configuration of data loading mode, makes that native system can be by the requirement operation of hommization.Comprise the establishment of ephemeral data storing directory simultaneously.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it also is possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to the foregoing description.
Claims (10)
1. the L-band bank base sea clutter recording geometry based on vector network analyzer is characterized in that, mainly comprises vector network analyzer, power amplifier, low noise amplifier, dual-mode antenna and main control computer;
Wherein, Said vector network analyzer is a signal sending and receiving equipment; Be used under said main control computer control, producing the frequency step continuous wave signal of designated parameter, this signal is radiated zone, sea to be measured through said dual-mode antenna after said power amplifier amplifies; Echoed signal receives through said dual-mode antenna; And through getting into said vector network analyzer after the said low noise amplifier raising signal to noise ratio; Said vector network analyzer also is used under main control computer control, suitable intermediate-frequency bandwidth being set; And echoed signal carried out obtaining extra large clutter data after time-domain windowed and the computing, main control computer writes down, analyzes and manage the extra large clutter data that obtain.
2. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 1; It is characterized in that; Said vector network analyzer possesses signal and transmits and receives function, and wherein, the intermediate-frequency bandwidth of said vector network analyzer is confirmed as follows:
Calculate maximum measuring distance according to transmitted signal bandwidth with counting, confirm the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure;
More than count and the corresponding different scanning time of the various combination in twos of intermediate-frequency bandwidth, find out and satisfy sweep time less than 1/4 wave corresponding intermediate-frequency bandwidth during the cycle, as the intermediate-frequency bandwidth of said vector network analyzer.
3. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 1 is characterized in that, said dual-mode antenna separates and all adopts single-offset parabolic reflector antenna; Antenna mount alternate orientation-pitching type turntable type mounting; Azimuth rotating platform forms tray type structure by constructed of aluminium spare, and its upper end connects the pitching part with bolt, and the lower end links to each other with the antenna mounting platform with bolt; The pitching driving box places the pitching cylinder interior, is output as an annular wheel that links to each other with cylinder.
4. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 3; It is characterized in that; Orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor; In order to drive orientation, pitch axis rotation, select for use sine and cosine resolver to be installed in respectively on azimuth axis of antenna, the pitch axis, in order to little change of sensed orientation, luffing angle; Orientation, pitch axis are to the hardware limit device is housed respectively.
5. like each described L-band bank base sea clutter recording geometry of claim 1 to 4 based on vector network analyzer; It is characterized in that; Main control computer also is used for through the measure batch parameter is set; Setting measurement order also is provided with fault recovery and handles and realize that extra large clutter measures automatically, automatically the measurement parameter setting comprise the repeatedly duplicate measurements of same parameter, same parameter measurement in the same time period, in the same time period different parameters measure and above three kinds of patterns under multiple measurement, and after verification, deposit measurement parameter in automatic measurement parameter file; Measurement data was put in storage automatically after measurement finished, and artificial warehouse-in mode is provided simultaneously.
6. like each described L-band bank base sea clutter recording geometry in the claim 1 to 4 based on vector network analyzer; It is characterized in that; Main control computer also is used for operating through ethernet line Long-distance Control scope; Employing multi-thread programming technology is utilized hub and communication server to control respectively and is vowed that network parameters setting and antenna rotate, launch and collection.
7. like each described L-band bank base sea clutter recording geometry in the claim 1 to 4 based on vector network analyzer; It is characterized in that; Said main control computer also comprises data analysis module; Said data analysis module is used to combine ocean environment parameter that said extra large clutter data are analyzed, and comprises mean value model coupling and amplitude distribution match.
8. like each described L-band bank base sea clutter recording geometry in the claim 1 to 4, it is characterized in that, also comprise power amplifier monitoring means and temperature monitoring unit based on vector network analyzer; Wherein, said power amplifier monitoring means is used to monitor through transmitting after the said power amplifier processing; Said temperature monitoring unit is used to monitor the working temperature of rack.
9. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 8; It is characterized in that; Said vector network analyzer adopts uninterrupted power source UPS power supply; Said power amplifier adopts the switching power supply power supply, and said power amplifier monitoring means and temperature monitoring unit adopt the Switching Power Supply power supply.
10. like each described L-band bank base sea clutter recording geometry in the claim 1 to 4 based on vector network analyzer; It is characterized in that; Also comprise supervisory computer, said supervisory computer is used for keeping watch on through camera the rotary state of said dual-mode antenna, and keeps watch on sea state.
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