CN102608582B - Carrier-borne full-coherent phased-array radar calibrator - Google Patents
Carrier-borne full-coherent phased-array radar calibrator Download PDFInfo
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Abstract
The invention relates to a carrier-borne full-coherent phased-array radar calibrator which comprises a local oscillator module, upper and lower frequency mixing modules, an intermediate frequency processing module, a target distance, a speed simulation module, a broadband noise generating module, a master control platform and the like, wherein the local oscillator module is divided into first and second local oscillator modules; the upper frequency mixing module is divided into first and second upper frequency mixing modules; the lower frequency mixing module is divided into first and second lower frequency mixing modules; the master control platform comprises a CPCI (Compact Peripheral Component Interconnect) motherboard, a power supply, a keyboard, a display, an external interface and a clock and delay control circuit; and each module and each component of the master control platform are supplied with power and carry out data exchange by the CPCI motherboard. According to the invention, a radar echo signal synthesized by overlaying a target and a broadband noise power can be vividly simulated and the detection capacity of the target under the noise interference of a carrier-borne full-coherent phased-array radar can be tested. The carrier-borne full-coherent phased-array radar calibrator has good application prospect in the technical field of calibration and checking of the phased-array radar.
Description
Technical field
The present invention relates to a kind of carrier-borne full coherent phased-array radar calibration device (being called for short radar calibration device), belong to phased-array radar calibration calibration technology field, it completes radar parameter verification and performance test after Shipborne Phased Array Radar is repaired or in development process.
Background technology
After Shipborne Phased Array Radar is repaired, the calibration of need to finding range to it, test the speed is with check radar system performance.Routine is the standard reflection device that utilizes bank known apart from Calibration Method, the naval vessels that phased-array radar is housed are sailed out of to bank certain distance, open radar and standard reflection device has been surveyed to checking and the calibration of radar, expend so very large human and material resources and financial resources, so high will waits people to develop the full coherent pulse Doppler of certain type range calibrator set (Gao Zhiyong forever, Wei Xiaoming, Zang Chuanjiang.The design of radar range calibration instrument system and realization [J]. application of electronic technology, 2010,36 (8): 58-86), realized the phased-array radar calibration operation of certain distance, simplified calibration complicacy.In recent years along with Radar Technology development, the performance of its calibration device and function have been proposed to requirements at the higher level, in the face of profound service check demands such as phased-array radar squelch and antijamming capabilities, studied the robot systems such as Hu little Chuan noise modeling theoretical (Hu little Chuan. the design of airborne phased array radar simulation system and the Study of the Realization [D]. Chengdu: University of Electronic Science and Technology, 2003), in addition Air Force Radar College of P. L. A. is old builds the people such as literary composition to noise and the synthetic (Chinese invention patent that is studied of echo signal power, publication number is CN101533092, name is called " radar clutter based on power distinction and multiple interference suppress method simultaneously ").Yet high will waits the prover of people's development can only simulate fixed range target forever, simultaneously can not dynamic similation distance and the radar echo signal of speed motion change; The airborne phased array radar simulator noise modeling algorithm of people's developments such as Hu little Chuan is complicated, calculated amount is large, and noise broadband is narrow, and the design of non-coherent system can not meet modern full phased-array radar alignment requirements, time performance test of radar deep-seated beds of land is limited, can only carry out school, outfield by upper warship and fly checking.
Summary of the invention
1, object: the object of the present invention is to provide a kind of carrier-borne full coherent phased-array radar calibration device, to solve problems of the prior art.
2, technical scheme: a kind of carrier-borne full coherent phased-array radar calibration device of the present invention, its concrete technical scheme is as follows:
See Fig. 1, a kind of carrier-borne full coherent phased-array radar calibration device, it comprises local oscillator module, on, lower frequency mixing module, intermediate frequency process module, target range, velocity simulate module, broadband noise generation module, the parts such as master control platform, wherein local oscillator module is divided into one, two local oscillator modules, uppermixing module is divided into first, the second uppermixing module, lower frequency mixing module is divided into first, second time frequency mixing module, master control platform comprises CPCI motherboard, power supply, keyboard, show, external interface and clock and delay control circuit, each component parts of above-mentioned modules and master control platform all obtains power supply and exchanges data by CPCI motherboard.
Annexation, signal transmission relation between above-mentioned each module are as follows:
As shown in Figure 1: Shipborne Phased Array Radar transmitting x band radar transmits, the electromagnetic horn connecting by low loss cable on radar calibration device receives this radar emission signal, 2～2.5G local oscillation signal that one local oscillator module produces, after 4 frequencys multiplication with the first order under frequency mixing module mixing produce the first intermediate-freuqncy signal, after producing the second intermediate-freuqncy signal, two local oscillator modules generation 0.86G local oscillation signals and the first intermediate-freuqncy signal difference frequency send into intermediate frequency process module, after intermediate frequency process, enter target range, velocity simulate module, complete the simulation of radar target signal distance and velocity information.Broadband noise generation module produces Shipborne Phased Array Radar and checks needed broadband noise signal, use frequency spectrum shift method to be modulated to x wave band, the second intermediate-freuqncy signal and two, the local oscillation signal that include target range and velocity information carry out going out via aerial radiation with x band broadband noise signal power is synthetic after twice uppermixing.The target information of display simulation on radar calibration device screen, by the keyboard operation radar target parameter of modifying, external interface connects computing machine, for radar calibration device on-line debugging, clock and delay control circuit provide the whole clocks of radar calibration device and sequential benchmark, power supply is the power supply of radar calibration device, and modules carries out exchanges data by CPCI motherboard.To introduce one by one modules structure and signal annexation below.
The structure of described target range, velocity simulate module and signal annexation are as follows:
It mainly comprises A/D conversion, reduction of speed circuit, memory module (RAM), raising speed circuit, digital phase-locked loop FM circuit, D/A conversion, clock and delay control circuit and x wave band local oscillation signal source.Relation is therebetween: Shipborne Phased Array Radar transmits and send into intermediate frequency process module after producing the second intermediate-freuqncy signal with twice down coversion of one, two local oscillation signals after radar calibration device input port, numerical control decay, filtering, intermediate frequency process module is comprised of if bandpas filter and intermediate frequency amplifier, sends into DRFM digital RF memory module and carry out AD sampling after intermediate frequency amplifier output.Adopt A/D and the D/A converter of 12 500MHz sampling rates, under clock and delay control circuit synchro control, the 500Mbps data stream that reduction of speed circuit produces A/D is divided into 4 road 125Mbps data stream, timesharing deposits in 4 groups of dual-port memory module RAM, completes the storage ablation process of digital signal; In the time data readback will being read, just under the synchro control of clock and delay control circuit, by first in first out order, by raising speed circuit, synthetic 500Mbps mono-circuit-switched data of the parallel 4 road 125Mbps data stream of memory module RAM is flowed, complete low-speed parallel data to the conversion of high-speed parallel data, by D/A, change and bandpass filter becomes analog if signal and exports with one, two local oscillation signal mixing respectively.For simultaneously can simulated target velocity information in DRFM digital RF memory module, in DRFM digital RF memory module, designed digital phase-locked loop FM circuit, before transforming, D/A adds digital phase-locked loop FM circuit, for radar target signal frequency modulation under the state of digital signal, improved the antijamming capability of signal, little many of the transmission interference ratio simulating signal that produces when long-distance transmissions.Wherein Fig. 3 is shown in by digital phase-locked loop FM circuit block diagram, and the part that modulation signal is controlled voltage as VCO changes its frequency, exports FM signal.When modulation signal is sawtooth wave, exportable swept-frequency signal.When modulation signal is digit pulse, can produce frequency shift keying modulation (fsk signal), the sawtooth wave that the modulation signal that waveform generator of the present invention produces is 10%.Clock and delay control circuit theory diagram are shown in Fig. 4, the high-speed clock signal of input and the data-signal dual-port memory module RAM write data signal, writing address signal, write signal, write clock signal and the reading data signal that produce 4 road low speed, read address signal, read signal, read clock signal, synthetic high speed clock signal and data-signal after multiplexing process.Writing address signal, by an internal counter circuit evolving, can be realized by computing circuit apart from time delay.Computing circuit is realized storer write address and is read the mathematical operation between address, and the difference between two addresses was directly proportional to time delay, and the length of time delay has determined simulated target distance range.
Described broadband noise generation module structure and signal annexation are as follows:
The present invention adopts broadband noise source, the mixing of x wave band local oscillation signal produces required broadband noise signal, broadband noise generation module theory diagram as shown in Figure 8, broadband noise generation module and radar target signal distance, velocity simulate module adopts same local oscillator, broadband noise source mixing after 4 frequencys multiplication, noise signal is moved to x wave band, through filtering low noise, amplify, after power amplification, export with radar target signal power is synthetic, by power, be coupled, after signal demodulator, give controller and control the size that voltage-controlled attenuator regulates broadband noise signal power, controller has manual and automatic regulating power size ability.The electricity 55 WAB0102HMS microwave steady noise sources of developing during broadband noise of the present invention source adopts, frequency spectrum coverage surpasses 1GHZ, excess noise ratio 37dB, broadband noise signal frequency spectrum can cover all working frequency of Shipborne Phased Array Radar.
The structure of described local oscillator module and signal annexation are as follows:
Local oscillator module is comprised of one, 2 two local oscillator module, and centre frequency is respectively 2.25GHz, 0.86GHz.One local oscillator produces x wave band local vibration sources through 4 frequencys multiplication and transmits and carry out descending for the first time mixing with Shipborne Phased Array Radar, and generation 1GHz the first intermediate-freuqncy signal and two local oscillators carry out producing 140MHz the second intermediate-freuqncy signal after down coversion again.
The structure of described intermediate frequency process module and signal annexation are as follows:
Intermediate frequency process module is comprised of if bandpas filter and intermediate frequency amplifier, intermediate frequency process module of the present invention has two intermediate frequency amplifiers and two bandpass filter, first, second intermediate-freuqncy signal noise jamming of filtering respectively, intermediate frequency amplifier is used for adjusting intermediate-freuqncy signal amplitude.It is 1000MHz, 140MHz that its bandpass filter is respectively centre frequency, passband 100MHz, 40MHz; For circuit consistance and simplification circuit, in put and adopt identical amplifying circuit, this amplifying circuit uses the integrated micro amplifier MSA-0806 of Hewlett-Packard Corporation, Fig. 5 is shown in by intermediate frequency amplifier circuit schematic diagram, system employing+12V power voltage supply, can offer the direct current biasing of amplifier in 7.8V left and right.If need larger gain, can adopt the mode of multi-stage cascade, between every one-level, with resistance π type attenuator circuit, increase isolation and ride gain.
The structure of described lower frequency mixing module and signal annexation are as follows:
Lower frequency mixing module is divided into first, second lower frequency mixing module.In the present invention, need twice time mixing, so need two mixting circuits.First order mixting circuit be Shipborne Phased Array Radar that radar calibration device receives transmit with a local oscillator under be mixed to 1GHz, the ZX05-153+ high performance mixer module that adopts Mini-Circuits company to produce, directly adopts SMA interface; Under the first intermediate-freuqncy signal 1GHz that second level mixting circuit is produced by first order mixting circuit and two local oscillator 0.86GHz, be mixed to 140MHz, adopt the CSM5TH broadband mixer of M/A COM Inc..
The structure of described uppermixing module and signal annexation are as follows:
Uppermixing module is divided into first, second uppermixing module.In the present invention, need uppermixing twice, so need two mixting circuits.First order mixting circuit be radar target signal and the two local oscillator uppermixings of simulation to 1GHz, the CLF-1A5 double balanced mixer of employing Synergy company; Second level mixting circuit is by 1GHz and a local oscillator uppermixing to x wave band, and the M9-7220 high performance mixer module that adopts MARKIMicrowave company to produce, directly adopts SMA interface.
Described master control platform structure and signal annexation are as follows:
Master control platform comprises CPCI motherboard, power supply, keyboard, demonstration, external interface and clock and delay control circuit.Keyboard, demonstration adopt common apparatus, and external interface is that RS-232 bus is connected with computing machine.CPCI motherboard carries out exchanges data work, and the present invention adopts CPCI-6965.Clock and delay control circuit provide sequential benchmark, as shown in Figure 4.The high-speed clock signal of input and the data-signal dual-port memory module RAM write data signal, writing address signal, write signal, write clock signal and the reading data signal that produce 4 road low speed, read address signal, read signal, read clock signal, synthetic high speed clock signal and data-signal after multiplexing process.Writing address signal, by an internal counter circuit evolving, can be realized by computing circuit apart from time delay.Computing circuit is realized storer write address and is read the mathematical operation between address, and the difference between two addresses was directly proportional to time delay.Power supply is input as 220V civil power, is output as+12V, and+5V ,+24V, meets direct current supply requirement.
3, advantage and effect: the advantage of a kind of carrier-borne full coherent phased-array radar calibration device of the present invention:
1) this full coherent phased-array radar calibration device not only can be simulated the quiet target of fixed range, all right skimulated motion target;
2) this full coherent phased-array radar calibration device can realistic simulation target and the broadband noise power synthetic radar echo signal that superposes, and can check target detection ability under Shipborne Phased Array Radar noise.
Accompanying drawing explanation
Fig. 1 radar calibration device system construction drawing
Fig. 2 radar target signal distance, velocity simulate theory diagram
Fig. 3 digital phase-locked loop FM circuit block diagram
Fig. 4 clock and delay control circuit theory diagram
Fig. 5 intermediate frequency amplifier circuit schematic diagram
Fig. 6 frequency spectrum shift test philosophy block diagram
Fig. 7 video noise measurement result schematic diagram
Fig. 8 radio noise measurement result schematic diagram
Fig. 9 broadband noise generation module theory diagram
Figure 10 radar calibration device hardware principle block diagram
Figure 11 radar calibration device software general module block diagram
Figure 12 main control software FB(flow block)
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described further.
See Fig. 1, a kind of carrier-borne full coherent phased-array radar calibration device, it comprises local oscillator module, on, lower frequency mixing module, intermediate frequency process module, target range, velocity simulate module, broadband noise generation module, the parts such as master control platform, wherein local oscillator module is divided into one, two local oscillator modules, uppermixing module is divided into first, the second uppermixing module, lower frequency mixing module is divided into first, second time frequency mixing module, master control platform comprises CPCI motherboard, power supply, keyboard, show, external interface and clock and delay control circuit, each component parts of above-mentioned modules and master control platform all obtains power supply and exchanges data by CPCI motherboard.
Annexation, signal transmission relation between above-mentioned each module are as follows:
As shown in Figure 1: Shipborne Phased Array Radar transmitting x band radar transmits, the electromagnetic horn connecting by low loss cable on this full coherent phased-array radar calibration device receives this radar and signals, 2～2.5G local oscillation signal that one local oscillator module produces, after 4 frequencys multiplication with the first order under frequency mixing module mixing produce the first intermediate-freuqncy signal, bandpass filter filtering spurious clutter disturbs, after amplifying adjustment, intermediate frequency sends into second level down-conversion mixer, after producing the second intermediate-freuqncy signal, two local oscillator modules generation 0.86G local oscillation signals and the first intermediate-freuqncy signal difference frequency enter intermediate frequency process module, intermediate frequency process module is comprised of if bandpas filter and intermediate frequency amplifier, its bandpass filter is passband 40MHz, centre frequency is 140MHz, intermediate frequency amplifier is adjusted intermediate-freuqncy signal amplitude, after intermediate frequency process, send into target range, velocity simulate module, complete the simulation of radar target signal distance and velocity information.Broadband noise generation module produces Shipborne Phased Array Radar and checks needed broadband noise signal, use frequency spectrum shift method to be modulated to x wave band, include the second intermediate-freuqncy signal of radar target distance and velocity information respectively with two, one local oscillation signal carries out going out via aerial radiation with the synthetic radar echo signal that produces of broadband noise signal power after twice uppermixing, Shipborne Phased Array Radar is received radar echo signal and is carried out data processing and show on radarscope, while is in conjunction with setting and the Presentation Function of radar calibration device, by the keyboard operation radar target parameter of modifying, the target information of display simulation directly perceived on screen, carry out data comparison with Shipborne Phased Array Radar display.External interface connects computing machine, and for radar calibration device on-line debugging, clock and delay control circuit provide the whole clocks of radar calibration device and sequential benchmark, and power supply is radar calibration device system power supply, and modules carries out exchanges data by CPCI motherboard.Because twice uppermixing/lower mixing adopts same local vibration source, the radar echo signal of playback and radar emission signal coherent, meet the technical requirement of Shipborne Phased Array Radar echo coherent.The present invention sets forth emphasis the design of target range, velocity simulate module and two modules of broadband noise generation module.
The signal annexation of described target range, velocity simulate module is as follows:
High precision, large-scale target range, velocity simulate are one of keys of this project.Digital RF memory technology is owing to having advantages of that tradition delay collimation method is incomparable, become gradually the most advanced technical method of radar target simulation, as shown in Figure 2, it mainly comprises A/D conversion, reduction of speed circuit, memory module (RAM), raising speed circuit, digital phase-locked loop FM circuit, D/A conversion, clock and delay control circuit and x wave band local oscillation signal source for radar target signal distance of the present invention, velocity simulate theory diagram.Relation is therebetween: Shipborne Phased Array Radar transmits and passes through input port, numerical control decay, after filtering with one, two local oscillation signals carry out twice time mixing and produce centre frequency 140MHz, bandwidth 50MHz intermediate-freuqncy signal, this signal is delivered to DRFM digital RF memory module after bandwidth is 40MHz band-pass filter, DRFM digital RF memory module is converted to digital signal by simulating signal and stores, reduction of speed circuit converts parallel data at a high speed the low-speed parallel data that match with memory read/write speed to, and deposit dual-port memory module RAM in, complete the ablation process of radar signal.Data read procedure is with to write process contrary, be that the data of storing in dual-port memory module RAM are under the synchro control of clock and delay control circuit, by first in first out principle of temporal sequence, by D/A, change with bandpass filter and form analog if signal after low-speed parallel data being converted into high-speed parallel data by raising speed circuit.In DRFM digital RF memory module, add frequency-shift keying circuit, for generation of Doppler shift, carry out simulated target radial velocity.Digital phase-locked loop FM circuit is shown in Fig. 3, and the part that modulation signal is controlled voltage as VCO changes its frequency, exports FM signal.When modulation signal is sawtooth wave, exportable swept-frequency signal.When modulation signal is digit pulse, can produce frequency shift keying modulation (fsk signal).Clock and delay control circuit provide sequential benchmark, as shown in Figure 4.The high-speed clock signal of input and the data-signal dual-port memory module RAM write data signal, writing address signal, write signal, write clock signal and the reading data signal that produce 4 road low speed, read address signal, read signal, read clock signal, synthetic high speed clock signal and data-signal after multiplexing process.Writing address signal, by an internal counter circuit evolving, can be realized by computing circuit apart from time delay.Computing circuit is realized storer write address and is read the mathematical operation between address, and the difference between two addresses was directly proportional to time delay.The length of time delay has determined simulated target distance range, and time delay, resolution determined the range resolution of simulated target.Realize high precision range simulation, just need to improve memory read/write clock frequency, make the control accuracy of time delay higher, along with the raising of memory read/write clock frequency, make to need larger storage space under identical time delay condition.According to existing device level and the technical requirement of this project, adopt A/D and the D/A converter of 12 500MHz sampling rates, to meet instant bandwidth and quantizing noise requirement.In order to realize the simulation of maximum 250km target range, memory module adopts the high-capacity and high-speed two-port RAM storer of 1024k * 16, and raising speed, reduction of speed circuit and two-port RAM memory management circuitry adopt high speed FPGA to realize.Fig. 5 is intermediate frequency amplifier circuit schematic diagram.
When want simulated target apart from time, clock and delay control circuit are according to wanting simulated target to calculate the time delay of playback memory data apart from size, by first in first out order, carry out data readback, playback of data D/A translation circuit in DRFM digital RF memory module converts digital signal to analog if signal; When wanting simulated target speed, in data reading in RAM memory stores, clock and delay control circuit trigger waveform generator and produce sawtooth wave effect digital phase-locked loop FM circuit, make radar target signal digital carrier frequency generation Doppler shift, thereby simulated target radial velocity, after twice up-conversion of radar target signal with broadband noise signal power synthetic produce radar echo signal through aerial radiation to Shipborne Phased Array Radar.
Described broadband noise generation module signal annexation is as follows:
For abilities such as check Shipborne Phased Array Radar noise inhibition, need to develop 1GHz broadband noise source and cover shipborne radar all working frequency, conventionally the way that produces radio noise is to adopt noise FM, utilizing video noise to go to modulate voltage controlled oscillator VCO realizes, although the method also can produce radio noise in approaching 1GHz broadband, there is the problems such as noise spectral density is less, spectral density is inhomogeneous.
For realizing broadband noise, this programme proposes to adopt the method for frequency spectrum shift, utilizes broadband noise source, x wave band local oscillation signal and x band broadband mixer to produce required broadband noise signal.For the principle of checking frequency spectrum shift, carried out proving test.Shown in frequency spectrum shift test philosophy block diagram 6.Broadband noise signal utilizes Agilent 33250A Function Arbitrary Waveform Generator to produce, and output noise level is-10dBm; Local oscillation signal is used E8257D microwave signal source to produce, output frequency 10GHz, power-10dBm; Frequency mixer adopts Tag TGM-202 broadband mixer, the about 10dB of conversion loss, and output radio noise adopts AV4033 frequency spectrograph to measure.
Fig. 7 is the video noise that 33250A Function Arbitrary Waveform Generator produces, Fig. 8 be AV4033 frequency spectrograph measure moving after radio spectrum, can find out that noise successfully moved local frequency 10GHz both sides, illustrate that the method is feasible.These external cause frequency mixer three port standing waves are slightly poor, should note the coupling design of termination circuit and the good earth of frequency mixer self when broadband is used.
In radar calibration device actual design, the electricity 55 WAB0102HMS microwave steady noise sources of developing during broadband noise signal adopts, frequency spectrum coverage surpasses 1GHZ, excess noise ratio 37dB, mixing after broadband noise signal and local oscillation signal 4 frequencys multiplication, noise signal is moved to x wave band, and noise spectrum can cover all working frequency of radar.Broadband noise generation module theory diagram as shown in Figure 9.
Broadband noise signal is radiate by electromagnetic horn after isolator, wave filter, low noise amplifier, voltage-controlled attenuator, power amplifier.Isolator is opened noise source and Amplification and insulation, wave filter filtering spurious spectrum component, through low noise amplifier and power amplifier, noise is amplified to appointment output power, accurate voltage-controlled attenuator is used for adjusting noise source watt level, after synthetic with radar target signal power, radiation is to Shipborne Phased Array Radar in order to check squelch and antijamming capability, and radar calibration device hardware principle block diagram is as Figure 10.
Describe below with reference to the accompanying drawings this radar calibration device software design scheme and flow process in detail
Complete machine software runtime environment is selected Windows 2000/XP operating system, and development environment adopts Visual C.By all adopting, Chinese is drop-down in whole software operation, the mode of pop-up menu and shortcut icon, software input mode also will be designed to the form of flexible and selectable, except instrument operation of front panel is controlled, directly support QWERTY keyboard and mouse simultaneously, by mouse, click all operations were that just can complete instrument, because software is the window of realizing human-computer interaction, therefore whole software will, according to simple, convenient, quick, be rich in hommization design.For meeting above-mentioned designing requirement, shown in radar calibration device software general module block diagram 11.
Whole Software for Design will adopt modularization idea, mainly comprise primary control program, device driver, control program, System self-test program and operation interface program.Wherein device driver package is drawn together various intelligent interfaces, keyboard, demonstration and printing supervisor, and the major function that every subprogram realizes is specific as follows:
Whole system software mainly comprises primary control program, device driver, control program, System self-test program and operation interface program.Wherein device driver package is drawn together various intelligent interfaces, keyboard, demonstration and printing supervisor, the following describes several emphasis function of program modules:
1) primary control program: be the control core of whole software systems, complete the Whole Process Control that enters duty from starting up to instrument, be responsible for calling of each software module, complete corresponding function;
2) self check and calibration procedure: self check software completes the function of instrument main hardware module and duty self check together with instrument hardware circuit, and real-time report self-detection result are correct to guarantee Instrument working state.Compensation for calibrating errors software mainly comprises passage frequency response calibration etc., is that instrument is realized the very important measures that index is stable, by the calibration to hardware module, makes it to reach optimum Working;
3) FPGA program is loaded and is controlled: when start, by the calling of main control software, complete the loading to a plurality of FPGA configurators, and complete in the course of the work the state of FPGA working procedure and parameter are controlled;
4) DRFM control program: according to the distance arranging, digital RF memory module is controlled, completed the control to circuit such as input radar emission signal high-speed sampling, storage, delay disposal and playback, realize the simulation of radar target distance; According to the speed and the mode of operation that arrange, function and pulse producer can produce sawtooth and digit pulse two class modulation signals, complete frequency sweep, frequency shift keying two class modulated signals, realize the simulation of radar target speed;
5) local frequency controls: according to input radar emission signal frequency, control local frequency, produce suitable IF-FRE and send digital RF memory module;
6) target and noise signal power are controlled: according to target and noise signal coupling mechanism, controller can conveniently regulate voltage-controlled attenuator to complete target and noise power is synthetic.Can guinea pig echoed signal and target and noise superposed signal;
Main control software FB(flow block) as shown in figure 12.Software running process is: after start powers on, carry out system and carry out function self check, Memory Checkout and hardware detection, after initialization completes, each functional module is carried out to self-test and start self calibration, according to the quantity of simulated target, distance, radial velocity, reflecting section, control generating output signal.
Claims (1)
1. a carrier-borne full coherent phased-array radar calibration device, it is characterized in that: it comprises local oscillator module, on, lower frequency mixing module, intermediate frequency process module, target range, velocity simulate module, broadband noise generation module and master control platform, wherein local oscillator module is divided into one, two local oscillator modules, uppermixing module is divided into first, the second uppermixing module, lower frequency mixing module is divided into first, second time frequency mixing module, master control platform comprises CPCI motherboard, power supply, keyboard, show, external interface and clock and delay control circuit, each component parts of above-mentioned modules and master control platform all obtains power supply and exchanges data by CPCI motherboard,
Carrier-borne full coherent phased-array radar transmitting x band radar transmits, the electromagnetic horn connecting by low loss cable on radar calibration device receives this radar emission signal, 2～2.5GHz local oscillation signal that one local oscillator module produces, after 4 frequencys multiplication, produce the first intermediate-freuqncy signal with first time frequency mixing module mixing, after producing the second intermediate-freuqncy signal, two local oscillator modules generation 0.86GHz local oscillation signals and the first intermediate-freuqncy signal difference frequency send into intermediate frequency process module, after intermediate frequency process, enter target range, velocity simulate module, complete the simulation of radar target signal distance and velocity information; Broadband noise generation module produces carrier-borne full coherent phased-array radar and checks needed broadband noise signal, use frequency spectrum shift method to be modulated to x wave band, modulated the second intermediate-freuqncy signal and two, one local oscillation signal that carry target range and velocity information carry out going out via aerial radiation with x band broadband noise signal power is synthetic after twice uppermixing; The target information of display simulation on radar calibration device screen, by the keyboard operation radar target parameter of modifying, external interface connects computing machine, for radar calibration device on-line debugging, clock and delay control circuit provide the whole clocks of radar calibration device and sequential benchmark, power supply is the power supply of radar calibration device, and modules carries out exchanges data by CPCI motherboard;
Described target range, velocity simulate module, it comprises A/D converter, reduction of speed circuit, memory module RAM, raising speed circuit, digital phase-locked loop FM circuit, D/A converter, clock and delay control circuit and x wave band local oscillation signal source, relation is therebetween: Shipborne Phased Array Radar transmits by calibration device input port, numerical control decay, after filtering with one, two twice of local oscillation signal down coversions are sent into intermediate frequency process module after producing the second intermediate-freuqncy signal, intermediate frequency process module is comprised of if bandpas filter and intermediate frequency amplifier, after intermediate frequency amplifier output, send into DRFM digital RF memory module and carry out AD sampling, adopt A/D and the D/A converter of 12 500MHz sampling rates, under clock and delay control circuit synchro control, the 500Mbps data stream that reduction of speed circuit produces A/D is divided into 4 road 125Mbps data stream, timesharing deposits in 4 groups of dual-port memory module RAM, complete the storage ablation process of digital signal, in the time data readback will being read, just under the synchro control of clock and delay control circuit, by first in first out order, by raising speed circuit, synthetic 500Mbps mono-circuit-switched data of the parallel 4 road 125Mbps data stream of memory module RAM is flowed, complete low-speed parallel data to the conversion of high-speed parallel data, by D/A converter and bandpass filter, modulated the second intermediate-freuqncy signal that carries target range and velocity information is exported with one, two local oscillation signal mixing respectively, for simultaneously can simulated target velocity information in DRFM digital RF memory module, in DRFM digital RF memory module, designed digital phase-locked loop FM circuit, before D/A converter, add digital phase-locked loop FM circuit, for radar target signal frequency modulation under the state of digital signal, improved the antijamming capability of signal, the part that modulation signal is controlled voltage as VCO changes its frequency, export FM signal, when modulation signal is sawtooth wave, output swept-frequency signal, when modulation signal is digit pulse, produce frequency shift keying modulation fsk signal, the sawtooth wave that the modulation signal that waveform generator produces is 10%, the high-speed clock signal of input and the data-signal dual-port memory module RAM write data signal, writing address signal, write signal, write clock signal and the reading data signal that produce 4 road low speed, read address signal, read signal, read clock signal, synthetic high speed clock signal and data-signal after multiplexing process, writing address signal, by an internal counter circuit evolving, is realized by computing circuit apart from time delay, computing circuit is realized storer write address and is read the mathematical operation between address, and the difference between two addresses was directly proportional to time delay, and the length of time delay has determined simulated target distance range,
Described broadband noise generation module and range on target signal, velocity simulate module adopt same local oscillator, broadband noise source mixing after 4 frequencys multiplication, noise signal is moved to x wave band, after the amplification of filtering low noise, power amplification, export with radar target signal power is synthetic, by power, be coupled, give after signal demodulator controller and control the size that voltage-controlled attenuator regulates broadband noise signal power, controller has the big or small ability of manual and automatic regulating power; Broadband noise source adopts WAB0102HMS microwave steady noise source, and frequency spectrum coverage surpasses 1GHZ, excess noise ratio 37dB, and broadband noise signal frequency spectrum can cover all working frequency of Shipborne Phased Array Radar;
Described local oscillator module is comprised of one, 2 two local oscillator module, and centre frequency is respectively 2.25GHz, 0.86GHz; One local oscillator produces x wave band local vibration sources through 4 frequencys multiplication and transmits and carry out descending for the first time mixing with Shipborne Phased Array Radar, and generation 1GHz the first intermediate-freuqncy signal and two local oscillators carry out producing 140MHz the second intermediate-freuqncy signal after down coversion again;
Described intermediate frequency process module is comprised of if bandpas filter and intermediate frequency amplifier, it respectively has two intermediate frequency amplifiers and two bandpass filter, first, second intermediate-freuqncy signal noise jamming of filtering respectively, intermediate frequency amplifier is used for adjusting intermediate-freuqncy signal amplitude, it is 1000MHz, 140MHz that its bandpass filter is respectively centre frequency, passband 100MHz, 40MHz; For circuit consistance with simplify circuit, in put and adopt identical amplifying circuit, this amplifying circuit to use integrated micro amplifier MSA-0806, system employing+12V power voltage supply, offers the direct current biasing of amplifier at 7.8V; If need larger gain, adopt the mode of multi-stage cascade, between every one-level, with resistance π type attenuator circuit, increase isolation and ride gain;
Described lower frequency mixing module is divided into first, second lower frequency mixing module, because of twice time mixing of needs, therefore need two mixting circuits; First order mixting circuit be Shipborne Phased Array Radar that radar calibration device receives transmit with a local oscillator under be mixed to 1GHz, adopt ZX05-153+ high performance mixer module, directly adopt SMA interface; Under the first intermediate-freuqncy signal 1GHz that second level mixting circuit is produced by first order mixting circuit and two local oscillator 0.86GHz, be mixed to 140MHz, adopt CSM5TH broadband mixer;
Described uppermixing module is divided into first, second uppermixing module, because of twice uppermixing of needs, therefore need two mixting circuits; First order mixting circuit be radar target signal and the two local oscillator uppermixings of simulation to 1GHz, employing CLF-1A5 double balanced mixer; Second level mixting circuit to x wave band, adopts M9-7220 high performance mixer module by 1GHz and a local oscillator uppermixing, directly adopts SMA interface;
Described master control platform comprises CPCI motherboard, power supply, keyboard, demonstration, external interface and clock and delay control circuit; Keyboard, demonstration adopt common apparatus, and external interface is that RS-232 bus is connected with computing machine; CPCI motherboard carries out exchanges data work, adopts CPCI-6965; Clock and delay control circuit provide sequential benchmark, the high-speed clock signal of input and the data-signal dual-port memory module RAM write data signal, writing address signal, write signal, write clock signal and the reading data signal that produce 4 road low speed, read address signal, read signal, read clock signal, synthetic high speed clock signal and data-signal after multiplexing process; Writing address signal, by an internal counter circuit evolving, is realized by computing circuit apart from time delay; Computing circuit is realized memory module RAM write address and is read the mathematical operation between address, and the difference between two addresses was directly proportional to time delay, and power supply is input as 220V civil power, be output as+12V, and+5V ,+24V, meets direct current supply requirement.
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