CN104391283A - Radar target simulation method and system - Google Patents
Radar target simulation method and system Download PDFInfo
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- CN104391283A CN104391283A CN201410719139.1A CN201410719139A CN104391283A CN 104391283 A CN104391283 A CN 104391283A CN 201410719139 A CN201410719139 A CN 201410719139A CN 104391283 A CN104391283 A CN 104391283A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
- G01S7/406—Means for monitoring or calibrating by simulation of echoes using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or transponder
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a radar target simulation method which is characterized by including the following steps: receiving radar excitation, converting radar excitation into medium frequency signals; converting medium frequency signals into digital signals; storing and delaying the digital signals; conducting frequency shifting on the digital signal frequency; playing the signals subjected to delaying and frequency shifting back; converting the signals into the simulation medium frequency signals; converting the medium frequency signals into target echo signals; transmitting the target echo signals into the radar. A forwarding type radar target simulation system is further disclosed. The radar is only required to provide excitation signals and does not need to provide signals such as the frame, the PRF and the reference. The method and the system have great significance on detection under the condition that the radar signals cannot be led out.
Description
Technical field
The present invention relates to Radar Signal Processing Technology field, particularly relate to a kind of radar target simulation method based on relay type and system.
Background technology
In recent years, along with the development of science and technology, radar system is increasingly sophisticated, of a great variety, and the design of system, production and maintenance become more and more difficult.If all adopt real target to provide test signal to radar to the test of radar performance, cost is higher.Radar System Simulations, in conjunction with modern emulation technology and Radar Technology, is set up the model meeting user's request, is had the advantage of dirigibility and economy with software.Radar carrying out debugging, the links such as test, examination of dispatching from the factory must carry out under the condition not having cooperative target.Therefore target simulator is that one of requisite checkout equipment produced by radar.
The key of target simulator is for radar provides a modulation signal met the demands.This signal must be consistent with true radar return as much as possible.Traditional target simulator adopts the mode in single signal source to realize usually.Follow-up develop coherent radar after, then adopt the target simulator of coherent system to carry out target simulation.The target simulator in this single signal source necessarily requires radar that waveform details is informed target simulator, and clock signal (frame, PRF, field angle etc.) is led to target simulator, and target simulator just can carry out accurate analogue echoes.But under many circumstances, this condition does not meet.Such as, when radar installation detects, clock signal is difficult to draw; And radar waveform is top secret information, the simulator development manufacturer that level of confidentiality is lower generally can not be informed.
For this reason, the interface of target simulator and radar must lack as much as possible, must realize the simulation to target under the condition of unknown radar waveform parameter, sequential relationship.
the content of invention
The present invention needs radar to inform waveform details to solve radar target simulation and draws the problem of clock signal (frame, PRF, field angle etc.), realizes the implementation method of the radar target simulation of the simulation to target under providing the condition of a kind of unknown radar waveform parameter, sequential relationship.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
Based on a method for the radar target simulation of relay type, comprise the following steps:
Receiving radar encourages; Radar excitation is converted to intermediate-freuqncy signal; Intermediate-freuqncy signal is converted to digital signal; Digital signal storage is postponed; To digital signal frequency shift; Playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; Intermediate-freuqncy signal is converted to target echo signal; Target echo signal is sent into radar.
Further, comprise the concrete steps of digital signal frequency shift: construct a digital circuit, this digital circuit produces Doppler signal; (complex multiplication) is taken advantage of to operate again Doppler signal and the digital signal after postponing.
As preferably, target simulator is directly by the excitation of line feedback mode receiving radar.
As preferably, target echo signal is presented by line by target simulator or the mode of empty feedback sends into radar.
Based on the method for the radar target simulation of above-mentioned a kind of relay type, the invention provides a kind of radar target simulation system based on relay type, comprise master component, down conversion components, up-converter, local oscillator assembly, baseband processing component, power supply, emitting module, receiving unit.
Receiver module be used for receiving radar excitation; Transmitter module is used for launching target echo signal; Master component provides upper computer software for the master control interface realizing radar simulator, and the steering order of user is sent to baseband processing component; Down conversion components is used for radar excitation to be converted to intermediate-freuqncy signal; Up-converter is used for intermediate-freuqncy signal to be converted to target echo signal; Local oscillator assembly provides the reference signal needed for each module, and its implementation comprises phase-locked PLL, directly synthesis, PLL+ and directly synthesizes hybrid implementation method etc.; Intermediate-freuqncy signal is converted to digital signal by baseband processing component, to delayed digital signal and frequency shift (FS), carries out playback, be converted to analog if signal to the signal after delay and frequency shift (FS); Power supply provides the operating voltage needed for each module.
During radar target simulation system works, receiver module receiving radar encourages; Radar excitation is converted to intermediate-freuqncy signal by down conversion components; In baseband processing component, intermediate-freuqncy signal is converted to digital signal, then to delayed digital signal and frequency shift (FS); Then playback is carried out to the signal after delay and frequency shift (FS), be converted to analog if signal; In up-converter, intermediate-freuqncy signal is converted to target echo signal; Target echo signal is sent into radar by emitting module.
As preferably, should based on the radar target simulation system of relay type, baseband processing component comprises analog-to-digital conversion module, D/A converter module, signal transacting motherboard.Analog-to-digital conversion module be used for intermediate-freuqncy signal AD sampling, intermediate-freuqncy signal is converted to digital signal; D/A converter module be used for postpone and frequency shift (FS) after signal carry out playback, be converted to analog if signal; Signal transacting motherboard is used for delayed digital signal and frequency shift (FS).
As preferably, two compute chip able to programme, a programmable interface chip should be comprised based on the signal transacting motherboard of the baseband processing component of the radar target simulation system of relay type.A compute chip primary responsibility AD able to programme sampling, Digital Down Convert, scene calculating, frequency memory and simulator control work; Another compute chip able to programme is responsible for target signature information superposition, Digital Up Convert and DA playback work; And programmable interface chip is responsible for CPCI interface communication, the host computer information of being sent by cpci bus is transmitted to two compute chip able to programme.
As preferably, analog-to-digital conversion module adopts the former National Semiconductor of TI() the ADC081500 chip of company.
As preferably, D/A converter module adopts the AD9736 chip of AD company.
The present invention has following beneficial effect: radar excitation is stored by technology such as microwave receiving passage, digital samples by the method, read after postponing a period of time, then obtain certain target echo signal postponed, again by Microwave emission passage, by it to antenna arrays of radar radiation, thus realize radar target simulation.This method only needs radar to provide pumping signal, does not need radar to provide the signals such as frame, PRF, benchmark.Thus enormously simplify the hinge of target simulator and radar.Detect when cannot draw for a lot of radar signal, tool is of great significance.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for radar target simulation based on relay type;
Fig. 2 is the block diagram of system of radar simulator;
Fig. 3 is the hardware basic composition figure of baseband processing component.
1, master component; 2, down conversion components; 3, up-converter; 4, local oscillator assembly; 5, baseband processing component; 6, power supply; 7, receiving unit; 8, emitting module; 9, up-conversion control module; 10, analog-to-digital conversion module; 11, D/A converter module; 12, down coversion control module; 13, communications interface unit; 14, signal transacting motherboard.
Embodiment
Below in conjunction with specific embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is further described:
Based on a method for the radar target simulation of relay type, realized by following steps:
1 is known with reference to the accompanying drawings, is a kind of process flow diagram of method of the radar target simulation based on relay type, comprises the following steps:
S01: receiving radar encourages;
S02: radar excitation is converted to intermediate-freuqncy signal;
S03: intermediate-freuqncy signal is converted to digital signal;
S04: digital signal storage is postponed;
S05: to digital signal frequency shift;
S06: playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal;
S07: intermediate-freuqncy signal is converted to target echo signal;
S08: target echo signal is sent into radar.
The method of the radar target simulation based on relay type of the present embodiment, by the excitation of receiving unit 8 receiving radar, radar excitation is converted to intermediate-freuqncy signal by down conversion components 3; At baseband processing component 5, intermediate-freuqncy signal is converted to digital signal, baseband processing component 5 pairs of delayed digital signals and frequency shift (FS); Baseband processing component 5 carries out playback to the signal after delay and frequency shift (FS), is converted to analog if signal; In up-converter 3, intermediate-freuqncy signal is converted to target echo signal; Target echo signal is sent into radar by emitting module 7.This method only needs radar to provide pumping signal, does not need radar to provide the signals such as frame, PRF, benchmark, highly beneficial for practical application.
Step S05 specifically comprises: in FPGA, construct the digital circuit that is called DDS.DDS is a kind of digital circuit of maturation, can produce the digital signal (being called Doppler signal) of certain frequency.Then (complex multiplication) is taken advantage of to operate again this Doppler signal and the digital signal after postponing.So just the digital signal after delay can be carried out the frequency shift (FS) of certain limit.
In general practical application, step S01 is realized by line feedback mode; Step S08 is presented by line or the mode of empty feedback realizes.
2 is known in conjunction with summary of the invention with reference to the accompanying drawings, and relay type radar simulator comprises master component 1, down conversion components 2, up-converter 3, local oscillator assembly 4, baseband processing component 5, power supply 6, emitting module 7, receiving unit 8.
During radar target simulation system works, receiver module 7 receiving radar encourages; Be delivered to down conversion components 2 and radar excitation is converted to intermediate-freuqncy signal; Be delivered to baseband processing component 5 and intermediate-freuqncy signal is converted to digital signal, to delayed digital signal and frequency shift (FS), playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; Be delivered to up-converter 3 and intermediate-freuqncy signal is converted to target echo signal; Be delivered to transmitter module 8 and target echo signal is sent into radar.
As Fig. 3, Base-Band Processing group 5 comprises analog-to-digital conversion module 10, D/A converter module 11 and signal transacting motherboard 14, and wherein analog-to-digital conversion module 10 bears the acquisition function of intermediate-freuqncy signal; D/A converter module 11 bears the playback function of intermediate-freuqncy signal; Signal transacting motherboard 14 bears signal transacting, emulation and algorithm realization function.Analog-to-digital conversion module 10 and signal transacting motherboard 14 interconnect; D/A converter module 11 and signal transacting motherboard 14 interconnect.
Signal transacting motherboard 14 comprises down coversion control module 12, up-conversion control module 9, communications interface unit 13.Down coversion control module 12 is the compute chip able to programme of an XC6VSX315T, it is mounted with 4 DDR3 SDRAM, down coversion control module 12 is also mounted with a FMC HPC slot simultaneously, and can expand one piece of FMC daughter board, down coversion control module 12 also interconnects with communications interface unit 13.In the algorithm application of DRFM, down coversion control module 12 primary responsibility AD sampling, Digital Down Convert, scene calculating, frequency memory and simulator control work.
Up-conversion control module 9 is the compute chip able to programme of an XC6VSX315T, and up-conversion control module 9 is also mounted with a FMC HPC slot, can expand one piece of FMC daughter board, and down coversion control module 12 also interconnects with communications interface unit 13.In the algorithm application of DRFM, the superposition of up-conversion control module 9 primary responsibility target signature information, Digital Up Convert and DA playback work.
Communications interface unit 13 is the programmable interface chip of an XC6SLX45, and its primary responsibility CPCI interface communication, the host computer information of being sent by cpci bus is transmitted to down coversion control module 12 and up-conversion control module 9.Communications interface unit 13 and down coversion control module 12, up-conversion control module 9 respectively have 32 pairs of LVDS interfaces interconnect, and interconnection agreement is SFI4.1.
Analog-to-digital conversion module 10 i.e. A/D chip and FMC interface, A/D chip is the former National Semiconductor of TI() ADC081500 of company.
D/A converter module 11 i.e. DA chip and FMC interface, DA chip is the AD9736 of AD company.
Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (9)
1. a radar target simulation method, is characterized in that, comprises the following steps:
S01: receiving radar encourages; S02: radar excitation is converted to intermediate-freuqncy signal; S03: intermediate-freuqncy signal is converted to digital signal; S04: digital signal storage is postponed; S05: to digital signal frequency shift; S06: playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; S07: intermediate-freuqncy signal is converted to target echo signal; S08: target echo signal is sent into radar.
2. radar target simulation method according to claim 1, is characterized in that, step S05 comprises: structure digital circuit produces Doppler signal; Doppler signal and the digital signal after postponing are taken advantage of again.
3. radar target simulation method according to claim 1, is characterized in that: step S01 is by the excitation of line feedback mode receiving radar.
4. radar target simulation method according to claim 1, is characterized in that: step S08 is presented by line or target echo signal is sent into radar by the mode of empty feedback.
5., based on a radar target simulation system for relay type, it is characterized in that, comprising:
Receiver module (7): receiving radar encourages; Transmitter module (8): launch target echo signal; Master component (1): for the master control interface realizing radar simulator provides upper computer software, and the steering order of user is sent to baseband processing component; Down conversion components (2): radar excitation is converted to intermediate-freuqncy signal; Up-converter (3): intermediate-freuqncy signal is converted to target echo signal; Local oscillator assembly (4): for each assembly provides reference clock signal; Baseband processing component (5): intermediate-freuqncy signal is converted to digital signal; To delayed digital signal and frequency shift (FS); Playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; Power supply (6): the operating voltage needed for each module is provided; During radar target simulation system works, described receiver module (7) receiving radar encourages; Be delivered to described down conversion components (2) and radar excitation is converted to intermediate-freuqncy signal; Be delivered to baseband processing component (5) and intermediate-freuqncy signal is converted to digital signal, to delayed digital signal and frequency shift (FS), playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; Be delivered to up-converter (3) and intermediate-freuqncy signal is converted to target echo signal; Be delivered to transmitter module (8) and target echo signal is sent into radar.
6. the radar target simulation system based on relay type according to claim 5, is characterized in that, described baseband processing component (5) comprising:
Analog-to-digital conversion module (10): the AD sampling of intermediate-freuqncy signal, is converted to digital signal by intermediate-freuqncy signal; D/A converter module (11): playback is carried out to the signal after delay and frequency shift (FS), is converted to analog if signal; Signal transacting motherboard (14): to delayed digital signal and frequency shift (FS); Described analog-to-digital conversion module (10) and described signal transacting motherboard (14) interconnect; Described D/A converter module (11) and described signal transacting motherboard (14) interconnect.
7. the radar target simulation system based on relay type according to claim 6, is characterized in that: described analog-to-digital conversion module (10) adopts the ADC081500 chip of TI company.
8. the radar target simulation system based on relay type according to claim 6, is characterized in that: described D/A converter module (11) adopts the AD9736 chip of AD company.
9. the radar target simulation system based on relay type according to claim 6, is characterized in that, described signal transacting motherboard (14) comprising:
Down coversion control module (12): primary responsibility AD sampling, Digital Down Convert, scene calculating, frequency memory and simulator control work; Up-conversion control module (9): be responsible for target signature information superposition, Digital Up Convert and DA playback work;
Communications interface unit (13): be responsible for CPCI interface communication, the host computer information of being sent by cpci bus is transmitted to down coversion control module (12) and up-conversion control module (9); Down coversion control module (12) is with described analog-to-digital conversion module (10) and described communications interface unit (13) interconnection; Up-conversion control module (9) is with described D/A converter module (11) and described communications interface unit (13) interconnection; Communications interface unit (13) is connected with down coversion control module (12) with described up-conversion control module (9), and connects cpci bus.
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| CN201410719139.1A CN104391283A (en) | 2014-12-01 | 2014-12-01 | Radar target simulation method and system |
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| CN106597398A (en) * | 2016-12-21 | 2017-04-26 | 中国航空工业集团公司雷华电子技术研究所 | Digital radar simulation system |
| CN106802593A (en) * | 2016-12-20 | 2017-06-06 | 上海交通大学 | Radar echo simulator high accuracy delay control method and radar echo simulator |
| CN107346019A (en) * | 2017-07-21 | 2017-11-14 | 成都玖锦科技有限公司 | A kind of dynamic positioning signal high-precision analog method |
| CN107356900A (en) * | 2017-07-21 | 2017-11-17 | 成都玖锦科技有限公司 | A kind of multichannel receiver signal imitation method under linear array |
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| JP2020060547A (en) * | 2018-10-09 | 2020-04-16 | ローデ ウント シュヴァルツ ゲーエムベーハー ウント コンパニ カーゲー | Radar target simulator in radar target simulation and method thereof |
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| CN109164428B (en) * | 2018-10-15 | 2020-06-26 | 华清瑞达（天津）科技有限公司 | Radar digital simulation system and method |
| CN109164428A (en) * | 2018-10-15 | 2019-01-08 | 华清瑞达（天津）科技有限公司 | Digital radar analogue system and method |
| CN109946691A (en) * | 2019-04-03 | 2019-06-28 | 北京行易道科技有限公司 | The realization method and system of radar simulator simulated target object, radar simulator |
| CN112684421A (en) * | 2019-10-17 | 2021-04-20 | 零八一电子集团有限公司 | Coherent calibration source system for linear frequency modulation continuous wave radar |
| CN111624569A (en) * | 2020-04-28 | 2020-09-04 | 北京航天朗智科技有限公司 | Radar signal processing device |
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Application publication date: 20150304 |