CN102023293A - Radar target intermediate frequency (IR) echo simulation system based on multi-beam amplitude-comparison angle measurement and control method thereof - Google Patents
Radar target intermediate frequency (IR) echo simulation system based on multi-beam amplitude-comparison angle measurement and control method thereof Download PDFInfo
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Abstract
The invention relates to a radar target intermediate frequency (IR) echo simulation system based on multi-beam amplitude-comparison angle measurement and a control method thereof, relating to the field of radar target echo simulation. The system comprises three target echo simulation boards and an arbitrary waveform generator instrument fixture, wherein the echo simulation boards are designed with a computer module PC104, a field programmable gate array (FPGA), direct digital synthesis (DDS) technique and a simulation circuit as cores; and the arbitrary waveform generator instrument fixture is designed with instrument programming control as the core. According to the invention, simultaneous 6-channel simulated target IR echo simulation of the radar of the multi-beam amplitude-comparison angle measurement system is realized, parameters of the simulated target echo such as distance, delay, echo amplitude, Doppler shift, pattern, direction pattern modulation, noise superposition and the like can be controlled, single-channel switching and output of dual-beam echo is realized, and the test use requirement of the radar signal processor of the system is met. In the invention, the arbitrary waveform generator instrument frock is utilized, thus improving the amplitude precision of the output echo signals; and the control program in the FPGA in the target echo simulation boards is designed by the soft IP core, thus providing convenience for hardware transplanting and clipping.
Description
Technical field
The invention belongs to the radar target simulation technical field, relate to multi-beam than width of cloth angle measurement radar target intermediate frequency echo simulation system and control method thereof, adopt digital circuit, mimic channel and complicated instrument control technology etc. to design, can simulate the output of 6 tunnel target echo signal of intermediate frequency simultaneously, finish the real-time calculating of moving target parameter, realize of the real-time control of analog intermediate frequency echoed signal apart from time delay, Doppler frequency deviation, two-dimensional direction figure modulation, amplitude modulation(PAM).
Background technology
Radar simulator is a product of Radar Technology development.In the development process of Radar Products, have vital role, can reduce many field trials, not only saved the development cost of product, also shortened the lead time of product.Therefore quite paid close attention in the radar industry.At present, the simulator that applies to radar at home has simple pulse digit simulator, video simulation device, intermediate frequency simulator etc., but its function is all more single, characteristic that can not fine simulated target.Such as:
1) be published in " based on DSP, DDS and ARM Radar IF Signal Simulator " (Zhao incites somebody to action, single great waves, happy and carefree work) of " application of electronic technology " 2005 09 phases, advanced DSP and DDS technology adopted in its system design, can produce 3 road analog intermediate frequency signals.But can not produce I, Q orthogonal modulation simulating signal; Can be used as an independently system, guinea pig real-time working state can not be used as the subsystem and the radar of radar.
2) be published in " radar science and technology " 01 phase in 2006 " Design of General-Purpose Surveillance Radar Simulator " (Jiang Jianmin, He Ruilong work).This simulator adopt PC104, FPGA, DAC, analogue quadrature moducator, rf frequency synthesizer and and difference directional diagram matching network form, this simulator complex structure cost is higher, be mainly used in the echoed signal of simulation monopulse system radar, and its directional diagram matching network is placed on after radio frequency combines frequently, not only require device performance height and directional diagram single, do not possess versatility, can not satisfy the test request of 3D simultaneous multiple beams Radar Signal Processing device.
External relevant therewith technology is not seen open.
Above-mentioned prior art can not provide the multi-functional of simulator, to satisfy guinea pig multiobject detection to the different motion state under difference transmits.
Summary of the invention
The present invention is directed to existing radar signal simulator and can not satisfy guinea pig under difference transmits, defective to the multiobject detection of different motion state, develop a kind of pitching simultaneous multiple beams than width of cloth angle measurement radar target intermediate frequency echo simulation system, can produce 6 tunnel simulated target echo signal of intermediate frequency simultaneously, to target echo signal apart from time delay, the speed Doppler frequency deviation, echo amplitude, pitching/azimuth pattern modulation etc. is carried out real time modelling, is used at laboratory stage the pulse compression of pitching simultaneous multiple beams system radar signal processor, Digital Down Convert, MTI, MTD, CFAR, functions such as some mark cohesion are verified.
The scheme of technical solution of the present invention: 1. the multi-beam that is provided is made up of 3 blocks of target echo simulation plates (echo 1/2 emulation board-master control borad, echo 3/4 emulation board and echo 5/6 emulation board) and AWG (Arbitrary Waveform Generator) instrument frock than width of cloth angle measurement radar target intermediate frequency echo simulation system, the echo simulation plate is that core designs with computer module PC104, high speed FPGA FPGA, the synthetic DDS technology of Direct Digital, Analog Circuit Design technology, and AWG (Arbitrary Waveform Generator) instrument frock is that core designs with instrument programming Control technology; 2. the multi-beam that is provided can adopt two kinds of methods to produce multi-beam than width of cloth angle measurement system radar while 6 tunnels analogy target echoes than width of cloth angle measurement radar target intermediate frequency echo simulation system, when not using AWG (Arbitrary Waveform Generator) instrument frock, 3 blocks of target echo simulation plates can be realized 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously, and the simulated target echoed signal satisfies the test request for utilization of functions such as radar signal processor pulse compression, Digital Down Convert, MTI, MTD (moving-target detection), the cohesion of some mark; When using AWG (Arbitrary Waveform Generator) instrument frock, can realize 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously by echo 1/2 emulation board and AWG (Arbitrary Waveform Generator) instrument frock, output echo amplitude precision height, can in echo, add noise, satisfy the use of functions such as radar signal processor orientation angle measurement accuracy, pitching angle measurement accuracy, the measurement of detection improvement factor; 3. by using hyperchannel AWG (Arbitrary Waveform Generator) and instrument programming technique, make the multi-channel back wave signal amplitude of target intermediate frequency echo simulation system output modulated by antenna radiation pattern by the radar PRF cycle, the exportable simulated target echo signal of intermediate frequency that comprises high precision position angle, angle of pitch information, in addition, by gpib bus programming Control AWG (Arbitrary Waveform Generator), realize the quick handoff functionality of AWG (Arbitrary Waveform Generator) passage output signal, can satisfy the simulation requirements that wave beam switches the system radar fast.
The present invention is made up of 3 blocks of target echo simulation plates and random waveform transmitter instrument frock, every block of target echo simulation plate is finished the generation of 2 tunnel echoed signals, common property is given birth to 6 tunnel echoed signals, wherein, target echo 1/2 emulation board is as master control borad, provide radar code-disc signal that simulation produces, GPS pps pulse per second signal to target echo 3/4,5/6 emulation board, as between plate synchronously.
Target echo simulation plate of the present invention mainly is made of PC104, FPGA, DDS, bandpass filter, driving circuit and level shifting circuit design, and the PC104 module is finished functions such as communication between plates, simulated target parameter calculate in real time, plate inner control as CPU; The FPGA device finish with PC104 between isa bus communicate by letter, functions such as echo sign indicating number type storage, echo time delay control and DDS control, target echo 1/2 emulation board (mainboard) is gone up FPGA and is responsible for producing the GPS pps pulse per second signal and the code-disc signal of simulating simultaneously; The DDS device finishes that the string of radar sign indicating number type I/Q digital signal and conversion, interpolation, I/Q quadrature are synthetic, Digital Up Convert, D/A digital to analog conversion and amplitude control; Bandpass filter is carried out filtering to the echoed signal that the target echo simulation plate produces, the outer clutter of filtering band.
Target echo 1/2 emulation board of the present invention can be set up with AWG (Arbitrary Waveform Generator) instrument frock by serial ports and communicate by letter, provide the start trigger pulse of simulated target echoed signal output and the real-time echo amplitude information of target to the instrument frock, realize control the instrument frock.
The present invention is based on the simulation control method of multi-beam than width of cloth angle measurement radar target intermediate frequency echo simulation system, comprise modulated control to simulated target echo two-dimensional direction figure, control to the time-delay of simulated target echo, Doppler frequency deviation, echo amplitude, the simulated target echo is added Noise Control, radar pitching the 6th and the 7th wave beam is switched the control of output:
1) to simulated target echo two-dimensional direction figure modulated control when only using 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the PC104 computer module of every block of target echo simulation plate can be stored radar pitching orientation two-dimensional direction figure, the maximum normalizing mode of radar directional diagram The data is stored, when target echo simulation plate after in real time distance is finished echo amplitude and calculated according to simulated target, use the radar two-dimensional direction diagram data of storage that echo amplitude is modulated, obtain final simulated target echo amplitude, and pass through FPGA, DDS realizes the amplitude control of output echoed signal.When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the instrument frock stores radar pitching orientation two-dimensional direction figure by program control technology, target 1/2 echo simulation plate sends the real-time echo amplitude of simulated target of calculating to the instrument frock, the instrument frock uses the radar two-dimensional direction diagram data of storage that the simulated target echo amplitude is modulated, and finishes signal output.
2) to the control multi-beam of simulated target echo time-delay/Doppler frequency deviation/echo amplitude during than width of cloth angle measurement radar target intermediate frequency echo simulation system works, setting the initial moment of emulation was 0 moment, carry out timing by the clock signal of outside input then, finish the calculating of simulated target real time position and radial velocity according to the simulated target kinematic parameter, calculate simulated target echo amplitude and Doppler frequency deviation according to distance that obtains and radial velocity, and the delay value of simulated target echo start trigger pulse is set by FPGA, realize echo time-delay control, by FPGA the frequency deviation register value of DDS is set, realizes the control of echo Doppler frequency deviation.When using 3 blocks of target echo simulation plates to carry out while 6 tunnels analogy target echo signal of intermediate frequency emulation, by FPGA the amplitude registers numerical value of DDS is set, realize that echo amplitude controls; When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out while 6 tunnels analogy target echo signal of intermediate frequency emulation, by the control of instrument program control technology realization to random waveform transmitter amplitude output signal.
3) the simulated target echo is added Noise Control when using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, can be when any waveform transmitters export target echoed signal by the instrument program control technology, add Gaussian noise, and noise power spectral density is controlled, thereby realize control, make it possible to detect the detection improvement factor of radar signal processor output simulated target echo signal to noise ratio (S/N ratio).
4) control that radar pitching 6/7 wave beam is switched output when pitching simultaneous multiple beams system radar in order to realize the high-altitude and to cover and during the optimum matching of beam scanning time, need switching the single channel of high angle of pitch wave beam and export.Multi-beam all can realize that than the width of cloth angle measurement radar target intermediate frequency echo simulation system single channel of radar dualbeam switches output under two kinds of schemes, when only using 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, calculate echo amplitude and the Doppler frequency of simulated target by target echo simulation when firm and hard, and switch output by the binary channels of the real-time single channel output of FPGA, DDS echo signal amplitude, Doppler's frequency at the pitching dualbeam; When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, use the directional diagram data of two wave beams that the simulated target echo amplitude is switched modulation by the instrument program control technology, realize that the single channel of dualbeam switches output.
Multi-beam of the present invention compared with prior art has the following advantages than width of cloth angle measurement radar target intermediate frequency echo simulation system:
The first, the present invention can adopt two kinds of schemes to realize the emulation of 6 tunnels analogy target echo signal of intermediate frequency simultaneously, and different output amplitude precision is provided, and the radar signal processor that can satisfy the different accuracy requirement uses, and has reduced the R﹠D costs waste.
Second, the present invention can realize real-time calculating, the generation simulated target echo parameter of simulated target movement locus, and can export 6 tunnel simulated target echoed signals simultaneously, satisfied of the request for utilization of simultaneous multiple beams system radar signal processor to the artificial echo signal.
The 3rd, the present invention can realize that the single channel of dualbeam simulated target echo switches output, has satisfied the request for utilization with this feature radar.
The 4th, the present invention adopts the instrument program control technology to realize the noise stack of simulated target echoed signal, has realized the control to simulated target echo signal to noise ratio (S/N ratio), can detect improvement factor to radar signal processor and test.
Description of drawings
Fig. 1 multi-beam of the present invention is than secondary angle measurement radar target intermediate frequency echo simulation service system pie graph
Fig. 2 multi-beam of the present invention is than the secondary angle measurement radar target intermediate frequency echo simulation FPGA of system design concept figure
Fig. 3 multi-beam of the present invention is than secondary angle measurement radar target intermediate frequency echo simulation system software process flow diagram
Embodiment
Referring to Fig. 1, the present invention is made up of 3 blocks of target echo simulation plates (echo 1/2 emulation board-master control borad, echo 3/4 emulation board, echo 5/6 emulation board) and AWG (Arbitrary Waveform Generator) instrument frock.The echo simulation plate is that core designs with computer module PC104, high speed FPGA FPGA, Direct Digital compositor DDS, mimic channel.AWG (Arbitrary Waveform Generator) instrument frock is that core designs with instrument programming Control technology, and random waveform transmitter instrument frock is made up of 23 passage random waveform transmitters.Wherein, the PC104 module is finished functions such as communication between plates, simulated target parameter calculate in real time, plate inner control as CPU; The FPGA device finish with PC104 between isa bus communicate by letter, functions such as echo sign indicating number type storage, echo time delay control and DDS control, target echo 1/2 emulation board (master control borad) is gone up FPGA and is responsible for producing the GPS pps pulse per second signal and the code-disc signal of simulating simultaneously; The DDS device finishes that the string of radar sign indicating number type I/Q digital signal and conversion, interpolation, I/Q quadrature are synthetic, Digital Up Convert, D/A digital to analog conversion and amplitude control; Bandpass filter is carried out filtering to the echoed signal that the target echo simulation plate produces, the outer clutter of filtering band.
When the present invention works, begin or the emulation end by keyboard response mode or the emulation of signal processor serial ports control mode control echo 1/2 emulation board (master control borad).After emulation began, echo 1/2 emulation board of target intermediate frequency echo simulation system provided simulation code-disc signal and GPS pps pulse per second signal to signal processor, the synchronous and time synchronized use as the orientation.
Referring to Fig. 2, high speed FPGA FPGA finishes with self-defined high speed parallel bus management, the Direct Digital of PC104 computer mould interblock and synthesizes the DDS device management, simulates functions such as code-disc management, simulating GPS pulse per second (PPS) management and the control and management of instrument frock in the target echo simulation plate of the present invention.The FPGA program adopts piece figure mode and VHDL language hybrid programming to count software I P nuclear, and its DDS device control function adopts the management of software I P kernel mode, has good hardware transplantability and cutting out property of function.DDS device Control Software IP kernel principle of work is seen shown in the accompanying drawing 2, DDS device Control Software IP kernel internal memory radar echo signal sign indicating number type, realize the time delay of simulated target echo start trigger pulse, and be in charge of and the DDS device between data bus, sequential control and telecommunication management and instrument control timing produce, thereby realize control to radar simulation target echo signal amplitude, time delay, Doppler frequency deviation.
The present invention can adopt two kinds of simulation control methods to produce multi-beams than width of cloth angle measurement system radar 6 tunnels analogy target echoes simultaneously:
[1] can realize 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously with 3 blocks of target echo simulation plates; When adopting this method to carry out the simulated target echo simulation, 6 tunnel echoed signals of 3 target echo simulation plate outputs can directly be exported to signal processor, as the analog echo signal of pitching while 6 wave beams.
[2] use AWG (Arbitrary Waveform Generator) instrument frock and echo 1/2 emulation board to realize 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously; When adopting this method to carry out the emulation of simulated target echoed signal, have output amplitude precision height, can add characteristics such as noise.Random waveform transmitter instrument frock is by using hyperchannel AWG (Arbitrary Waveform Generator) and instrument programming technique, make the multi-channel back wave signal amplitude of target intermediate frequency echo simulation system output modulated by antenna radiation pattern, the exportable simulated target echo signal of intermediate frequency that comprises high precision position angle, angle of pitch information by the radar PRF cycle.In addition,, realize the quick handoff functionality of AWG (Arbitrary Waveform Generator) passage output signal, can satisfy the test request that wave beam switches radar system fast by gpib bus programming Control AWG (Arbitrary Waveform Generator).
The present invention is based on the simulation control method of multi-beam than width of cloth angle measurement radar target intermediate frequency echo simulation system, comprise modulated control to simulated target echo two-dimensional direction figure, control to the time-delay of simulated target echo, Doppler frequency deviation, echo amplitude, the simulated target echo is added Noise Control, radar pitching the 6th and the 7th wave beam is switched the control of output:
1) to simulated target echo two-dimensional direction figure modulated control when only using 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the PC104 computer module of every block of target echo simulation plate can be stored radar pitching orientation two-dimensional direction figure, the maximum normalizing mode of radar directional diagram The data is stored, when target echo simulation plate after in real time distance is finished echo amplitude and calculated according to simulated target, use the radar two-dimensional direction diagram data of storage that echo amplitude is modulated, obtain final simulated target echo amplitude, and pass through FPGA, DDS realizes the amplitude control of output echoed signal.When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the instrument frock stores radar pitching orientation two-dimensional direction figure by program control technology, target 1/2 echo simulation plate sends the real-time echo amplitude of simulated target of calculating to the instrument frock, the instrument frock uses the radar two-dimensional direction diagram data of storage that the simulated target echo amplitude is modulated, and finishes signal output.
2) to the control multi-beam of simulated target echo time-delay/Doppler frequency deviation/echo amplitude during than width of cloth angle measurement radar target intermediate frequency echo simulation system works, setting the initial moment of emulation was 0 moment, carry out timing by the clock signal of outside input then, finish the calculating of simulated target real time position and radial velocity according to the simulated target kinematic parameter, calculate simulated target echo amplitude and Doppler frequency deviation according to distance that obtains and radial velocity, and the delay value of simulated target echo start trigger pulse is set by FPGA, realize echo time-delay control, by FPGA the frequency deviation register value of DDS is set, realizes the control of echo Doppler frequency deviation.When using 3 blocks of target echo simulation plates to carry out while 6 tunnels analogy target echo signal of intermediate frequency emulation, by FPGA the amplitude registers numerical value of DDS is set, realize that echo amplitude controls; When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out while 6 tunnels analogy target echo signal of intermediate frequency emulation, by the control of instrument program control technology realization to random waveform transmitter amplitude output signal.
3) the simulated target echo is added Noise Control when using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, can be when any waveform transmitters export target echoed signal by the instrument program control technology, add Gaussian noise, and noise power spectral density is controlled, thereby realize control, make it possible to detect the detection improvement factor of radar signal processor output simulated target echo signal to noise ratio (S/N ratio).
4) control that radar pitching 6/7 wave beam is switched output when pitching simultaneous multiple beams system radar in order to realize the high-altitude and to cover and during the optimum matching of beam scanning time, need switching the single channel of high angle of pitch wave beam and export.Multi-beam all can realize that than the width of cloth angle measurement radar target intermediate frequency echo simulation system single channel of radar dualbeam switches output under two kinds of schemes, when only using 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, calculate echo amplitude and the Doppler frequency of simulated target by target echo simulation when firm and hard, and switch output by the binary channels of the real-time single channel output of FPGA, DDS echo signal amplitude, Doppler's frequency at the pitching dualbeam; When using target 1/2 echo simulation plate and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, use the directional diagram data of two wave beams that the simulated target echo amplitude is switched modulation by the instrument program control technology, realize that the single channel of dualbeam switches output.
Referring to Fig. 3, simulated target echo simulation program of the present invention is: after radar powers up, simulated target echo simulation plate is finished initialization, the simulation beginning, calculate current simulation time when target echo simulation is firm and hard, and calculate the position and the radar beam scan position of skimulated motion target in real time, judge then whether simulated target crosses with the radar scanning wave beam, when crossing, the target echo simulation buttress according to simulated target current location and speed calculate in real time analogue echo apart from time delay and Doppler frequency deviation, and use the maximum normalizing directional diagram of the radar bearing pitching bidimensional data of storage that echo amplitude is modulated, generate the DDS parameter of controlled target echo.In the initial moment of next CPI (coherent handle at interval), the target echo simulation plate enters the controlled variable that CPI interrupts finishing the DDS device and writes, and realizes DDS output simulated target echo amplitude, frequency deviation, the isoparametric control of time delay in the cycle to next CPI.Go round and begin again, the target echo simulation plate is finished functions such as the judgement that crosses, echo parameter calculating, Way of Echo Control of each CPI cycle simulated target, realizes continuous simulated target echo simulation.
With echo simulation system applies shown in Figure 1 on certain search radar signal processor, its simulation process is: radar signal processor provides CPI trigger pulse and PRF trigger pulse to the target echo simulation system, the target echo simulation system provides the radar code-disc signal and the GPS pps pulse per second signal of simulation to signal processor, uses synchronously for time synchronized, orientation between system.After the simulation beginning, echo simulation system and signal processor all use guinea pig code-disc signal (comprising positive northern signal, delta pulse signal) to carry out the radar beam scan position and calculate, the echo simulation system puts and simulates the zero hour is 0 second, use the outside clock signal that provides to carry out time counting, the absolute time that obtains simulating simultaneously.At each CPI in the cycle, absolute time, target travel position, the radar beam scan position in the next CPI initial moment in cycle of echo simulation system-computed, and judge whether moving target can cross with radar beam in the cycle at next CPI, if cross, then calculate at that time target location, speed, obtain the amplitude, Doppler frequency deviation of simulated target echo, apart from parameters such as time delays, and use radar directional diagram that echo amplitude is modulated.In the initial moment (CPI trigger pulse rising edge place) in next CPI cycle, the echo simulation system sets the running parameter of DDS in the plate, realizes the emulation output of simulation target echo signal in the next CPI cycle.The analog echo signal of 6 passages is simultaneously inserted signal processor, and signal processor is sampled, after a series of processing such as pulse pressure, is obtained Targets Dots echoed signal.The Targets Dots data that obtain by comparison signal Processing machine testing and the goal theory point mark data of echo simulation system-computed can be verified the function and the performance of signal processor.
Claims (4)
1. multi-beam is than width of cloth angle measurement radar target intermediate frequency echo simulation system, it is characterized in that: the echo simulation system is made up of 3 blocks of target echo simulation plates and random waveform transmitter instrument frock, every block of target echo simulation plate is finished the generation of 2 tunnel echoed signals, common property is given birth to 6 tunnel echoed signals and is directly exported to signal processor, as the analog echo signal of pitching while 6 road wave beams; Described echo simulation plate comprises computer module PC104, high speed FPGA FPGA, the synthetic DDS of Direct Digital, bandpass filter, driving circuit and level shifting circuit, wherein, the PC104 module finishes as CPU that communication between plates, simulated target parameter calculate in real time, plate inner control function; The FPGA device finish with PC104 between isa bus communicate by letter, echo sign indicating number type storage, echo time delay control and DDS control function, be located at FPGA on the target echo simulation mainboard also produce simulating GPS pps pulse per second signal and code-disc signal give other two blocks of target echo simulation plates as between plate synchronously; The DDS device finishes that the string of radar sign indicating number type I/Q digital signal and conversion, interpolation, I/Q quadrature are synthetic, Digital Up Convert, D/A digital to analog conversion and amplitude control; Bandpass filter is carried out filtering to the echoed signal that the target echo simulation plate produces, the outer clutter of filtering band; Driving circuit is finished the driving of target echo simulation system output Transistor-Transistor Logic level signal; Level shifting circuit is finished the conversion of inside and outside Transistor-Transistor Logic level signal of target echo simulation system and RS-442 differential level signal; Described AWG (Arbitrary Waveform Generator) instrument frock is made of the hyperchannel AWG (Arbitrary Waveform Generator), by adopting the instrument programming, make the multi-channel back wave signal amplitude of target intermediate frequency echo simulation system output modulated by antenna radiation pattern by the radar PRF cycle, output comprises the simulated target echo signal of intermediate frequency of high precision position angle, angle of pitch information; Described target echo simulation mainboard is set up by serial ports and AWG (Arbitrary Waveform Generator) instrument frock and communicate by letter, provides the start trigger pulse of simulated target echoed signal output and the real-time echo amplitude information of target to the instrument frock, and realization is to the control of instrument frock.
2. multi-beam according to claim 1 is than width of cloth angle measurement radar target intermediate frequency echo simulation system, it is characterized in that: the control program of described high speed FPGA FPGA adopts software I P kernel mode management DDS device, DDS device Control Software IP kernel internal memory radar echo signal sign indicating number type, realize the time delay of simulated target echo start trigger pulse, and be in charge of and the DDS device between data bus, sequential control and telecommunication management and generation instrument control timing, thus realize radar simulation target echo signal amplitude, time delay, the control of Doppler frequency deviation.
3. based on the control method of multi-beam, it is characterized in that: adopt two kinds of methods to produce multi-beam simultaneously than width of cloth angle measurement system radar 6 tunnels analogy target echoes than width of cloth angle measurement radar target intermediate frequency echo simulation:
A kind of method is with the firm and hard existing 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously of 3 target echo simulation;
Another kind method realizes 6 tunnels analogy target intermediate frequency echo simulation functions simultaneously with echo simulation mainboard and AWG (Arbitrary Waveform Generator) instrument frock.
4. multi-beam according to claim 3 is than width of cloth angle measurement radar target intermediate frequency echo simulation control method, it is characterized in that: the target echo simulation simulation comprises the modulated control to simulated target echo two-dimensional direction figure, control to the time-delay of simulated target echo, Doppler frequency deviation, echo amplitude, the simulated target echo is added Noise Control, radar pitching the 6th and the 7th wave beam is switched the control of output:
[1] to simulated target echo two-dimensional direction figure modulated control
A) use 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the PC104 computer module storage radar pitching orientation two-dimensional direction figure of every block of target echo simulation plate, the maximum normalizing mode of radar directional diagram The data is stored, when target echo simulation plate after in real time distance is finished echo amplitude and calculated according to simulated target, use the radar two-dimensional direction diagram data of storage that echo amplitude is modulated, obtain final simulated target echo amplitude, and realize the amplitude control of output echoed signal by FPGA and DDS;
B) use target echo simulation mainboard and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, the instrument frock stores radar pitching orientation two-dimensional direction figure by programmed control, the target echo simulation mainboard sends the real-time echo amplitude of simulated target of calculating to the instrument frock, the instrument frock uses the radar two-dimensional direction diagram data of storage that the simulated target echo amplitude is modulated, and finishes signal output;
[2] to the control of simulated target echo time-delay/Doppler frequency deviation/echo amplitude
Multi-beam is during than width of cloth angle measurement radar target intermediate frequency echo simulation system works, setting the initial moment of emulation was 0 moment, carry out timing by the clock signal of outside input then, finish the calculating of simulated target real time position and radial velocity according to the simulated target kinematic parameter, calculate simulated target echo amplitude and Doppler frequency deviation according to distance that obtains and radial velocity, and the delay value of simulated target echo start trigger pulse is set by FPGA, realize echo time-delay control, by FPGA the frequency deviation register value of DDS is set, realizes the control of echo Doppler frequency deviation;
A) use 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation,, realize echo amplitude control by the amplitude registers numerical value that FPGA is provided with DDS;
B) use target echo simulation mainboard and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, by the control of the program control realization of instrument to random waveform transmitter amplitude output signal;
[3] the simulated target echo being added Noise Control uses target echo simulation mainboard and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, when being controlled at random waveform transmitter export target echoed signal by instrument program, add Gaussian noise, make noise power spectral density controlled, thereby realize control, can detect the detection improvement factor of radar signal processor output simulated target echo signal to noise ratio (S/N ratio);
[4] control that radar pitching 6/7 wave beam is switched output will realize that the high-altitude covers and during the optimum matching of beam scanning time, need switch the single channel of high angle of pitch wave beam and export when pitching simultaneous multiple beams system radar:
A) use 3 blocks of target echo simulation plates to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, calculate echo amplitude and the Doppler frequency of simulated target by target echo simulation when firm and hard, and export by the real-time single channel output of FPGA and the DDS echo signal amplitude and the binary channels switching of Doppler's frequency at the pitching dualbeam;
B) use target echo simulation mainboard and AWG (Arbitrary Waveform Generator) instrument frock to carry out whiles 6 tunnels analogy target echo signal of intermediate frequency emulation, use the directional diagram data of two wave beams that the simulated target echo amplitude is switched modulation by the instrument program control technology, realize that the single channel of dualbeam switches output.
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