CN103529433A - Linear frequency modulation radar target speed simulation method and echo signal simulation source - Google Patents

Linear frequency modulation radar target speed simulation method and echo signal simulation source Download PDF

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Publication number
CN103529433A
CN103529433A CN201210230614.XA CN201210230614A CN103529433A CN 103529433 A CN103529433 A CN 103529433A CN 201210230614 A CN201210230614 A CN 201210230614A CN 103529433 A CN103529433 A CN 103529433A
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frequency
signal
linear
source
radar
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邵晟
卢岩辉
李媛媛
刘莹
张琦
姜海卫
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Shanghai Radio Equipment Research Institute
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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
    • G01S7/4069—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 involving a RF signal injection
    • 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
    • G01S7/4073—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 involving an IF signal injection

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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 relates to a linear frequency modulation radar target speed simulation method and an echo signal simulation source. The linear frequency modulation radar target speed simulation method comprises the following steps that: two direct digital frequency synthesis sources respectively generate linear frequency modulation pulse signals of which the center frequency is f1 and single frequency signals of which the frequency is (f2+fd), wherein the f1+f2=fI, wherein the fI is the frequency of baseband signals which are transmitted by a measured linear frequency modulation radar and is also a Doppler frequency; and after being mixed together, the linear frequency modulation pulse signals and the single frequency signals are further mixed with local oscillator signals f0, such that echo simulation signals can be generated.

Description

Linear FM radar target velocity analogy method and echoed signal dummy source
Technical field
The present invention relates to radar simulation testing apparatus general radar signal simulation field, be specifically related to a kind of linear FM radar target velocity analogy method and echoed signal dummy source.
Background technology
In the situation that having moving-target, radar return signal relatively transmits and has passed through compression or stretching conversion.For the radar of pulse system, whole burst signal is modulated by Doppler frequency, be equivalent to Doppler frequency by pulse repetition rate to sampling, receiver also carrys out demodulation doppler information by this point.In order to realize the simulation to target velocity, what the phase place of each pulse Doppler frequency component of simulating signal must be with this time point under actual conditions is identical, and receiver can demodulate Doppler frequency like this, realizes the test to radar velocity measurement function.
For Radar Signal In-Pulse Characteristics, internal modulation is the radar of linear frequency modulation system, mainly contains at present the speed that two large class methods are carried out simulated target.First class is the target simulation source design based on digital frequency memory technique, and the method is the velocity characteristic of simulated target effectively, but system is complicated, and technical difficulty is large, and hardware and software cost is very high.Second largest class is the target simulation source design based on DDS, if we adopt a slice DDS, chip directly produces analogue echoes signal, accomplish that each pulse start-phase conforms to actual conditions, must calculate each pulse initial phase separately, and when producing each pulse, the initial phase of this pulse is set in the phase register of DDS, this needs dummy source to have very high working clock frequency, thereby strengthens design of hardware and software difficulty and the design cost of dummy source.Another method for designing based on DDS is from Radar Signal Processing, through deriving, obtain, utilize accurately control DDS trigger pulse time delay to reach simulated target speed, but the resolution of the Doppler frequency that the method can be simulated and frequency range are subject to many factors restriction, have certain limitation.
Summary of the invention
The object of the present invention is to provide a kind of linear FM radar target velocity analogy method and echoed signal dummy source, under the prerequisite of effective simulated target distance and velocity characteristic, greatly reduce the working clock frequency in analogue echoes source, thereby greatly reduce design of hardware and software difficulty, reduce hardware cost.
To achieve the above object, the invention provides a kind of linear FM radar target velocity analogy method, two Direct Digital Frequency Synthesizes Sources produce respectively centre frequency and are chirp pulse signal and frequency be (
Figure 722311DEST_PATH_IMAGE002
) simple signal,
Figure 798852DEST_PATH_IMAGE003
, for the frequency of the baseband signal of tested linear FM radar transmitting, be Doppler frequency; By after described chirp pulse signal and simple signal mixing again with local oscillation signal
Figure 319963DEST_PATH_IMAGE004
mixing, produces analogue echoes signal.
Above-mentioned linear FM radar target velocity analogy method, wherein, the linear frequency modulation bandwidth of described chirp pulse signal equals the linear frequency modulation bandwidth of tested linear FM radar.
Another technical scheme provided by the invention is a kind of linear frequency modulated radar signal imitation source, comprise digital signal processor, the field programmable gate array being connected with described digital signal processor, the first Direct Digital Frequency Synthesizes Source, the second Direct Digital Frequency Synthesizes Source, frequency mixer and filter integration module and microwave mixer and microwave attenuation integration module; Described field programmable gate array is controlled described the first Direct Digital Frequency Synthesizes Source and the second Direct Digital Frequency Synthesizes Source and is produced respectively centre frequency and be
Figure 569679DEST_PATH_IMAGE005
chirp pulse signal and frequency be (
Figure 492635DEST_PATH_IMAGE006
) simple signal,
Figure 737147DEST_PATH_IMAGE007
,
Figure 807872DEST_PATH_IMAGE008
for the frequency of the baseband signal of tested linear FM radar transmitting,
Figure 798961DEST_PATH_IMAGE009
for Doppler frequency; Described frequency mixer and filter integration module carry out mixing, filtering to described chirp pulse signal and simple signal, form echo analog intermediate frequency signal; Described echo analog intermediate frequency signal in described microwave mixer and microwave attenuation integration module with local oscillation signal mixing, produce echo microwave mode analog signal.
The present invention brings following beneficial effect:
Linear FM radar target velocity analogy method of the present invention and echoed signal dummy source, can be effectively for the testing performance indexes such as ranging and range rate of chirp radar, greatly reduce the working clock frequency of dummy source, thereby reduced design of hardware and software difficulty, reduced hardware cost.
Accompanying drawing explanation
Linear FM radar target velocity analogy method of the present invention and echoed signal dummy source are provided by following embodiment and accompanying drawing.
Fig. 1 is the schematic diagram that under truth, radar signal produces, transmits and receives.
Fig. 2 is the schematic diagram of linear FM radar target velocity analogy method of the present invention.
Fig. 3 is the block diagram in linear frequency modulated radar signal imitation of the present invention source.
Embodiment
Below with reference to Fig. 1～Fig. 3, linear FM radar target velocity analogy method of the present invention and echoed signal dummy source are described in further detail.
It shown in Fig. 1, is the schematic diagram that under truth, radar signal produces, transmits and receives.The baseband signal of radar emission
Figure 576425DEST_PATH_IMAGE008
by intermediate frequency, produced, after extra pulse is chopped off, carry out again up-conversion ( and local oscillation signal
Figure 287209DEST_PATH_IMAGE010
mixing), become radio-frequency transmissions and go out, thereby in space, run into compression or the stretching that time domain occurs moving target, echoed signal, through same local oscillation signal down coversion, becomes echo intermediate-freuqncy signal.
It shown in Fig. 2, is the schematic diagram of linear FM radar target velocity analogy method of the present invention.This method is by the baseband signal of test linear FM radar transmitting
Figure 144306DEST_PATH_IMAGE008
(intermediate-freuqncy signal) is divided into two parts, and a part is that centre frequency is
Figure 776276DEST_PATH_IMAGE011
chirp pulse signal (the linear frequency modulation bandwidth of this chirp pulse signal equals the linear frequency modulation bandwidth of tested linear FM radar), another part be frequency be ( ) simple signal, by two Direct Digital frequency synthesis (Direct Digital Synthesizer, DDS) source, produced respectively, and have ,
Figure 743729DEST_PATH_IMAGE009
for Doppler frequency, then by after two parts of signals mixing again with local oscillation signal
Figure 292522DEST_PATH_IMAGE010
mixing, produces echo microwave mode analog signal, in Fig. 2
Figure 318247DEST_PATH_IMAGE013
represent (the linear frequency modulation bandwidth of tested linear FM radar).
It shown in Fig. 3, is the block diagram that can realize the echoed signal dummy source of above-mentioned linear FM radar target velocity analogy method.Described echoed signal dummy source comprises digital signal processor (Digital Signal Processor, DSP) 11, field programmable gate array (Field-Programmable Gate Array, FPGA) the 12, the one DDS source 13, the 2nd DDS source 14, frequency mixer and filter integration module 15 and microwave mixer and microwave attenuation integration module 16;
Whole dummy source has four external interfaces: system clock, microwave control signal and synchronizing pulse, CAN interface, echoed signal simulation output; System clock radar provides, and can guarantee good coherent; Synchronizing pulse is the pulse repetition rate of radar emission signal;
Described DSP 11 connects by CAN bus and host computer (dummy source is controlled computing machine, does not show in Fig. 3), and dummy source is controlled computing machine can set by CAN bus analog echo signal distance, speed and the mode of operation etc. of echoed signal dummy source;
Described FPGA 12 is connected with described DSP 11, and described FPGA 12 and DSP 11 form the control module of whole dummy source;
A described DDS source 13 is connected with described FPGA 12 respectively with the 2nd DDS source 14, and the described FPGA 12 described DDS sources 13 of control and the 2nd DDS source 14 produce respectively centre frequency and be
Figure 718934DEST_PATH_IMAGE015
chirp pulse signal and frequency be (
Figure 122233DEST_PATH_IMAGE006
) simple signal,
Figure 318859DEST_PATH_IMAGE015
selection should guarantee
Figure 73189DEST_PATH_IMAGE016
with (
Figure 747884DEST_PATH_IMAGE006
) spuious and harmonic wave after mixing in rear class wave filter band is more few better;
Described frequency mixer and filter integration module 15 are connected with the 2nd DDS source 14 with a described DDS source 13 respectively, for to centre frequency being
Figure 208952DEST_PATH_IMAGE011
chirp pulse signal and frequency be (
Figure 638796DEST_PATH_IMAGE006
) simple signal carry out mixing, filtering, form echo analog intermediate frequency signal;
Described echo analog intermediate frequency signal after attenuation in described microwave mixer and microwave attenuation integration module 16 and local oscillation signal
Figure 552526DEST_PATH_IMAGE017
mixing, produces echo microwave mode analog signal, this gust of signal
Figure 93228DEST_PATH_IMAGE018
by described microwave mixer and microwave attenuation integration module 16, produced.
Analogue echoes signal of the present invention there are differences with true echo model: the first, and in simulating signal, centre frequency is the production method of chirp pulse signal be with DDS, in each pulse, to produce the linear FM signal that an initial phase is 0, and
Figure 9549DEST_PATH_IMAGE006
simple signal be directly to be produced by DDS, its phase place meets sinusoidal wave rule, so the phase place of whole train of impulses does not tally with the actual situation; The second, the pulse width of simulating signal and pulsed frequency are with the variation of target velocity, not change, and this point does not tally with the actual situation yet.But according to classical radar theory and Radar Signal Processing principle, the analogue echoes signal that the method that the present invention provides produces does not affect the processing of radar signal processor to echoed signal with the difference of true echo.In order to verify this conclusion, true echo model and analogue echo model have been carried out to emulation, result proof this method is effective.

Claims (3)

1. a linear FM radar target velocity analogy method, is characterized in that, two Direct Digital Frequency Synthesizes Sources produce respectively centre frequency and are
Figure 559977DEST_PATH_IMAGE001
chirp pulse signal and frequency be
Figure 947096DEST_PATH_IMAGE002
simple signal, , be the frequency of the baseband signal of tested linear FM radar transmitting, for Doppler frequency; By after described chirp pulse signal and simple signal mixing again with local oscillation signal
Figure 879914DEST_PATH_IMAGE005
mixing, produces analogue echoes signal.
2. linear FM radar target velocity analogy method as claimed in claim 1, is characterized in that, the linear frequency modulation bandwidth of described chirp pulse signal equals the linear frequency modulation bandwidth of tested linear FM radar.
3. a linear frequency modulated radar signal imitation source, comprise digital signal processor, the field programmable gate array being connected with described digital signal processor, it is characterized in that, described dummy source also comprises the first Direct Digital Frequency Synthesizes Source, the second Direct Digital Frequency Synthesizes Source, frequency mixer and filter integration module and microwave mixer and microwave attenuation integration module;
Described field programmable gate array is controlled described the first Direct Digital Frequency Synthesizes Source and the second Direct Digital Frequency Synthesizes Source and is produced respectively centre frequency and be chirp pulse signal and frequency be simple signal,
Figure 548289DEST_PATH_IMAGE008
,
Figure 450999DEST_PATH_IMAGE009
for the frequency of the baseband signal of tested linear FM radar transmitting, for Doppler frequency;
Described frequency mixer and filter integration module carry out mixing, filtering to described chirp pulse signal and simple signal, form echo analog intermediate frequency signal;
Described echo analog intermediate frequency signal in described microwave mixer and microwave attenuation integration module with local oscillation signal mixing, produce echo microwave mode analog signal.
CN201210230614.XA 2012-07-05 2012-07-05 Linear frequency modulation radar target speed simulation method and echo signal simulation source Pending CN103529433A (en)

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Cited By (9)

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CN104345304A (en) * 2014-09-30 2015-02-11 上海无线电设备研究所 Low-scattering radar medium frequency echo signal analog source
CN106371082A (en) * 2016-08-26 2017-02-01 上海无线电设备研究所 Linear velocity pull-off jamming identification method
CN106646405A (en) * 2016-12-02 2017-05-10 上海无线电设备研究所 Terahertz radar system parameter calibration system
CN107271975A (en) * 2017-06-16 2017-10-20 北京理工大学 The radar return Doppler frequency coherent analogy method measured in real time based on frequency
CN109061581A (en) * 2018-06-04 2018-12-21 中国电子科技集团公司第四十研究所 A kind of radar target of linear FM signal is apart from accurate simulator and method
CN112630735A (en) * 2020-12-21 2021-04-09 贵州航天计量测试技术研究所 Doppler frequency shift generation method and device for pulse linear frequency modulation signal
CN112666531A (en) * 2020-12-21 2021-04-16 上海无线电设备研究所 Distance Doppler coupling effect evaluation method and system based on constant acceleration
CN113687320A (en) * 2021-08-17 2021-11-23 西安天和防务技术股份有限公司 Radar echo simulation method and device, terminal equipment and storage medium
CN114237343A (en) * 2021-12-24 2022-03-25 中国电子科技集团公司第十四研究所 Ultra-wideband waveform generation method based on dual-channel DAC

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CN102435984A (en) * 2011-09-09 2012-05-02 陕西长岭电子科技有限责任公司 Echo simulation device for Doppler radar and implementation method thereof

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104345304A (en) * 2014-09-30 2015-02-11 上海无线电设备研究所 Low-scattering radar medium frequency echo signal analog source
CN106371082B (en) * 2016-08-26 2019-01-08 上海无线电设备研究所 Linear speed pull-off jamming recognition methods
CN106371082A (en) * 2016-08-26 2017-02-01 上海无线电设备研究所 Linear velocity pull-off jamming identification method
CN106646405A (en) * 2016-12-02 2017-05-10 上海无线电设备研究所 Terahertz radar system parameter calibration system
CN107271975A (en) * 2017-06-16 2017-10-20 北京理工大学 The radar return Doppler frequency coherent analogy method measured in real time based on frequency
CN107271975B (en) * 2017-06-16 2018-10-09 北京理工大学 The radar return Doppler frequency coherent analogy method measured in real time based on frequency
CN109061581A (en) * 2018-06-04 2018-12-21 中国电子科技集团公司第四十研究所 A kind of radar target of linear FM signal is apart from accurate simulator and method
CN112630735A (en) * 2020-12-21 2021-04-09 贵州航天计量测试技术研究所 Doppler frequency shift generation method and device for pulse linear frequency modulation signal
CN112666531A (en) * 2020-12-21 2021-04-16 上海无线电设备研究所 Distance Doppler coupling effect evaluation method and system based on constant acceleration
CN113687320A (en) * 2021-08-17 2021-11-23 西安天和防务技术股份有限公司 Radar echo simulation method and device, terminal equipment and storage medium
CN113687320B (en) * 2021-08-17 2024-05-07 西安天和防务技术股份有限公司 Simulation method and device of radar echo, terminal equipment and storage medium
CN114237343A (en) * 2021-12-24 2022-03-25 中国电子科技集团公司第十四研究所 Ultra-wideband waveform generation method based on dual-channel DAC
CN114237343B (en) * 2021-12-24 2023-09-08 中国电子科技集团公司第十四研究所 Ultra-wideband waveform generation method based on dual-channel DAC

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