CN109444838A - One kind being based on the dual frequency solution velocity ambiguity method and system of pulse accumulation frame - Google Patents
One kind being based on the dual frequency solution velocity ambiguity method and system of pulse accumulation frame Download PDFInfo
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- CN109444838A CN109444838A CN201811062904.1A CN201811062904A CN109444838A CN 109444838 A CN109444838 A CN 109444838A CN 201811062904 A CN201811062904 A CN 201811062904A CN 109444838 A CN109444838 A CN 109444838A
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The invention discloses one kind to be based on the dual frequency solution velocity ambiguity method and system of pulse accumulation frame, include: transmitting subsystem, baseband signal generation module therein generates Barker code or linear FM signal, and it is output to Microwave emission module, it receives baseband signal to dock and is mixed, it is modulated to microwave frequency band, after power amplification, external antenna is output to and is radiated to space；Receiving subsystem, the echo-signal that receiving antenna inputs is down-converted to intermediate frequency from microwave frequency band by microwave receiving module therein, and it is output to medium frequency reception module and carries out intermediate-freuqncy signal gain control, the intermediate-freuqncy signal amplitude leyel for being output to signal processing module is controlled in OK range, signal processing module is according to the type of pulse accumulation frame, pulse recurrence frequency is adjusted in interframe, it is alternately accomplished the ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying, and it generates corresponding lock-out pulse and is output to other modules, it is completed at the same time signal acquisition, pulse compression accumulation and target detection function.
Description
Technical field
The present invention relates to Radar Technology fields, in particular to a kind of to be based on the dual frequency solution velocity ambiguity method of pulse accumulation frame
And system.
Background technique
Space-based pointing radar mainly carries out target acquisition and measurement to space non-cooperative target, for high-speed motion mesh
Mark, very-long-range pointing radar, which can exist, obscures contradictory problems apart from tachometric survey.Existing speed ambiguity solution mainly uses DSP soft
The method of part processing is difficult to judge the order of velocity ambiguity when radar is interfered or detection signal-to-noise ratio is low.
In existing patent, " the TPRF method of avoiding velocity measurement obscureness of Doppler weather radar " (application number:
201010270482.4) a kind of multiple PRF Detection Techniques are disclosed, three suitable pulse recurrence frequencies, structure are selected
It is detected at two DPRF, actual speed is extrapolated according to measurement result.It is " a kind of based on the solution distance-speed for changing signal frequency modulation rate
Spend blur method " (grant number: 201410353579.X) signal time width design N number of pulse signal different by selection, radar
According to timing transmitting pulse signal and return pulse signal echo-signal, using design matched filter to echo-signal into
Row matched filtering simultaneously judges whether to realize effective pulse pressure, obtains range ambiguity number and calculates unambiguous distance and without fuzzy speed
Degree." the solution velocity ambiguity algorithm based on Fast Lookup Table method " (application number: 201610600630.1) utilizes four kinds of different repetitions
Frequency and the speed ambiguity solution table pre-established, calculate actual speed with round-robin algorithm line by line." double frequency moves back in a kind of arteries and veins
Velocity ambiguity and range ambiguity method and system " (application number: 201710379519.9) generate the different transmitting of two-way frequency and swash
Signal is encouraged, processing is received using the frequency difference of two frequencies of echo-signal and calculates time speed.Above four kinds of schemes are benefits
With multiple complex frequency, different transmitting pulse waveforms or different tranmitting frequencies, obtained indirectly according to the proportionate relationship of measurement result
Actual speed.
In paper, " LFMCW radar high-speed target speed ambiguity solution new method " is the ambiguity solution method of track association, is passed through
To target motion modeling, target average speed is calculated, and most very much not obscures the coefficient of speed with average speed estimation." Xie Yundong
A kind of fuzzy new method of target radial speed " a kind of new SAR-GMTI velocity solution blur method is proposed, while utilizing ginseng
The ambiguity solution ability of poor baseline and staggered." a kind of ambiguity solution method for PD system frequency agile radar " is using in advance
The range ambiguity table of foundation resolves range ambiguity, then resolves actual speed according to multiple PRF.Document above and retrieve specially
Sharp is equally all to resolve to obtain without fuzzy speed indirectly using software approach.
Summary of the invention
The invention proposes one kind to be based on the dual frequency solution velocity ambiguity method and system of pulse accumulation frame, by changing pulse
The repetition of frame interframe is accumulated, alternately realizes that directly detection obtains target velocity measured value, has without obscuring ranging and testing the speed without fuzzy
Have the advantages that rate accuracy is high under Low SNR.
The present invention is able to solve the problem of super-long-range detection is apart from velocity ambiguity contradiction, is applied to the days such as satellite, space station
The fields such as base noncooperative target tracking measurement, can directly obtain the metrical informations such as distance, the speed of target.
In order to achieve the goal above, the invention is realized by the following technical scheme:
One kind be based on the dual frequency solution velocity ambiguity system of pulse accumulation frame, include: circulator, antenna, transmitting subsystem and
Receiving subsystem；The transmitting subsystem, it further comprises baseband signal generation module and Microwave emission module；Reception
System, it further comprises microwave receiving module, medium frequency reception module and signal processing module；The transmitting subsystem and reception
System passes through the circulator respectively and connect with the antenna；The Microwave emission module, baseband signal generation module, microwave connect
It receives module and medium frequency reception module receives the synchronization pulse of the signal processing module output, carry out transmitting-receiving timing synchronization.
The baseband signal generation module generates Barker code or linear frequency modulation baseband signal, and is output to Microwave emission module；It is described
Microwave emission module, docking receive baseband signal and are mixed, be modulated to microwave frequency band, after power amplification, be output to ring
Shape device；Received echo-signal is down-converted to intermediate frequency from microwave frequency band by the microwave receiving module, and is output to medium frequency reception
Module；The medium frequency reception module carries out intermediate-freuqncy signal gain control, will be output to the intermediate-freuqncy signal width of signal processing module
Level control is spent in OK range, and the signal processing module adjusts pulse weight in interframe according to the type of pulse accumulation frame
Complex frequency, is alternately accomplished the ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying, and generates corresponding lock-out pulse letter
Number other modules are output to, are completed at the same time signal acquisition, pulse compression accumulation and target detection function.
Preferably, the signal processing module includes A/D sampling unit, Digital Down Convert unit, pulse compression unit, arteries and veins
Rush accumulative element, interframe switch control unit and object detection unit.Intermediate-freuqncy signal is carried out band logical number by the A/D sampling unit
Mould conversion, then data buffer storage into FIFO；The Digital Down Convert unit goes forward side by side intermediate-freuqncy signal digital mixing to base band
Row low-pass filtering, is extracted according to signal bandwidth；The pulse compression unit carries out Barker code or linear FM signal carries out
Pulse compression, improves range resolution；The pulse accumulation unit is by the data Pingpang Memory after pulse pressure to external two panels SRAM
In；The object detection unit reads the two-dimensional surface data after pulse pressure from table tennis in SRAM；The interframe switch control unit
It is entire signal processor working condition master controller, according to the type of pulse accumulation frame, adjusts pulse recurrence frequency in interframe,
It is alternately accomplished the ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying；The Digital Down Convert unit, pulse compression are single
Member, pulse accumulation unit and interframe switch control unit are realized in fpga chip；The object detection unit is real in dsp chip
It is existing.
Preferably, the signal processing module further includes the repetition adjustment unit, it is to complete ranging frame target in DSP
Detection, and target unambiguous distance information is obtained, judge whether target can fall in and test the speed in frame transmitting blind area, if falling in transmitting
In blind area, fine tuning is tested the speed the frame repetition period, avoids target by reflexed to transmitting blind area.
Preferably, the ranging frame pulse repetition is F, and transmitting signal time width is T1, and range gate time width is T2, pulse product
Tired number is M, and the frame pulse repetition of testing the speed is F*N, and transmitting signal time width is T1/N, and range gate time width is T2/N, pulse product
Tired number is M*N, and obscuring order N is 2 power relationships.
Preferably, the ranging frame measurement obtains without the distance for obscuring remote target being R, and target range is in the frame that tests the speed
It will appear multiple reflexed, fall in the position R' of the frame that tests the speed to target range R according to C/2/ (F*N) modulus.If modulus value divided by
(C/2) it is the light velocity that result, which is less than transmitting signal time width T1/N, C, and fine tuning is tested the speed the frame repetition period, the product of adjustment amount and K
It is greater than transmitting signal time width, K=floor (R/ (C/2/ (F*N))), floor are downward floor operation symbol.
One kind of the invention is based in the dual frequency solution velocity ambiguity method and system of pulse accumulation frame, interframe switching control mould
The working condition of block comprising the steps of:
A1, interframe switch control unit are worked by synchronized-pulse control radar in ranging frame operating mode, each repetition
Period completes signal transmitting and echo reception, writes data into SRAM1 after pulse compression, completes current repetition echo data
A2 is jumped to after processing；
A2, judge whether pulse accumulation unit completes M effective impulse accumulation and jump to step A3 if completed, if
It does not complete, jumps to A1 and continue to execute；
A3, setting next frame type code 0x55, update are tested the speed the frame repetition period, and step A4 is jumped to；
A4, interframe switch control unit are worked by synchronized-pulse control radar in the frame operating mode that tests the speed, each repetition
Period completes signal transmitting and echo reception, writes data into SRAM2 after pulse compression, completes current repetition echo data
A5 is jumped to after processing；
A5, judge whether pulse accumulation unit completes M*N effective impulse accumulation and jump to step A3, such as if completed
Fruit is not completed, and is jumped to A4 and is continued to execute；
A6, setting next frame type code are 0xAA, jump to step A1.
One kind of the invention is based in the dual frequency solution velocity ambiguity method and system of pulse accumulation frame, repetition adjustment unit
Working condition comprising the steps of:
B1, ranging frame pulse accumulation is waited for, when frame type code changes to 0x55 from 0xAA, jumps to step B2；
B2, ranging frame data, correlative accumulation and detection target are read, obtains unambiguous distance information, jumps to step B3；
Whether test the speed repetition period of frame of B3, judgement finely tuned, if so, step B4 is jumped to, if not, jumping to step
Rapid B7；
B4, holding test the speed frame the repetition period it is constant；
B5, the target unambiguous distance being calculated according to step B2 and that finely tuned test the speed the frame repetition period, judge mesh
Whether reflexed is fallen in the transmitting blind area of Gao Zhongying mark, if so, jumping to step B6, jumps to step B10 if not；
B6, the frame that tests the speed are restored to testing the speed the frame repetition period before adjusting, and jump to step B10；
B7, frame repetition period of testing the speed are reduced to 1/ (F*N), and transmitting signal time width is reduced to T1/N, and range gate is reduced to T2/
N jumps to step B8；
B8, the target unambiguous distance being calculated according to step B2 and that finely tuned test the speed the frame repetition period, judge mesh
Whether reflexed is fallen in the transmitting blind area of Gao Zhongying mark, if so, step B9 is jumped to, if not, jumping to step B10；
It B9, the target unambiguous distance R obtained according to step B2 and tests the speed the frame repetition period, carries out that non-emissive is calculated
What blind area was blocked tests the speed the frame repetition period, and step B10 is jumped to after the completion of calculating；
B10, completion test the speed the repetition period assignment of frame, jump to step B11；
B11, ranging frame processing are completed.
Compared with the prior art, the present invention has the following advantages:
In pulse pointing radar, low repetition increases target without fuzzy detection range, but is easy to produce velocity ambiguity；
Gao Zhongying improves target without the fuzzy range that tests the speed, but is easy to produce range ambiguity, using based on the dual frequency solution of pulse accumulation frame
Velocity ambiguity method can solve speed fuzzy problem when long-range detection.
The scheme of the prior art is usually to utilize multiple complex frequency, different transmitting pulse waveforms or different tranmitting frequencies,
Actual speed is obtained indirectly according to the proportionate relationship of measurement result, and the present invention is the repetition frequency by changing pulse accumulation frame
Rate is alternately accomplished low repetition pulse accumulation and high repetition pulse accumulation, unambiguous distance is directly calculated and without fuzzy speed.
Apart from velocity ambiguity contradictory problems when the present invention solves pointing radar super-long-range detection, have rate accuracy height and
The advantages of strong antijamming capability.The present invention utilizes interframe switch control unit, realizes FPGA ranging burst accumulation frame and the arteries and veins that tests the speed
The alternate treatment of frame is tired out in alluviation, and DSP obtains unambiguous distance information according to ranging frame, calculates the repetition period for the frame that tests the speed, finally
Target is directly detected according to the frame that tests the speed to obtain without the fuzzy information that tests the speed.
Detailed description of the invention
Fig. 1 is a kind of basic composition block diagram based on the dual frequency solution velocity ambiguity system of pulse accumulation frame of the present invention；
Fig. 2 is a kind of group based on the signal processing module in the dual frequency solution velocity ambiguity system of pulse accumulation frame of the present invention
At block diagram；
Fig. 3 is present invention lock-out pulse and transmitting signal timing diagram in normal work；
Fig. 4 is a kind of interframe switching control module based in the dual frequency solution velocity ambiguity system of pulse accumulation frame of the present invention
Working condition flow chart；
Fig. 5 is a kind of work based on the repetition adjustment unit in the dual frequency solution velocity ambiguity system of pulse accumulation frame of the present invention
Make state flow chart.
Specific embodiment
The present invention is further elaborated by the way that a preferable specific embodiment is described in detail below in conjunction with attached drawing.
As shown in Figure 1, the present invention is a kind of to be based on the dual frequency solution velocity ambiguity system of pulse accumulation frame, include: circulator, day
Line, and the transmitting subsystem for completing baseband signal up-conversion and power amplification, and for receiving and handling echo-signal
Receiving subsystem.
Above-mentioned transmitting subsystem, it further comprises baseband signal generation module and Microwave emission module；Above-mentioned reception subsystem
System, it further comprises microwave receiving module, medium frequency reception module and signal processing module.
Described in the Microwave emission module, baseband signal generation module, microwave receiving module and medium frequency reception module receive
The synchronization pulse of signal processing module output, carries out transmitting-receiving timing synchronization.
The baseband signal generation module generates Barker code or linear frequency modulation baseband signal, and signal frequency is in the present invention
70MHz, signal bandwidth 2MHz, and it is output to Microwave emission module.
The Microwave emission module, docking receive baseband signal and are mixed, be modulated to microwave Ka frequency range, put through overpower
After big, it is output to circulator.
Received echo-signal is down-converted to intermediate frequency 70MHz from microwave Ka frequency range by the microwave receiving module, and is exported
To medium frequency reception module.
The medium frequency reception module carries out intermediate-freuqncy signal gain control, will be output to the intermediate-freuqncy signal of signal processing module
Amplitude leyel controls in OK range, and the present invention controls output level in A/D modulus conversion chip full scale input voltage
1/2 at.
The signal processing module adjusts pulse recurrence frequency in interframe, is alternately accomplished according to the type of pulse accumulation frame
The ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying, and generate corresponding lock-out pulse and be output to other modules, together
When complete signal acquisition, pulse compression accumulation and target detection function.
As shown in Fig. 2, in the present embodiment, signal processing module includes A/D sampling unit, Digital Down Convert unit, arteries and veins
Rush compression unit, pulse accumulation unit, interframe switch control unit, object detection unit and repetition adjustment unit.
The Digital Down Convert unit, pulse compression unit, pulse accumulation unit and interframe switch control unit are in FPGA
Chip is realized；The object detection unit and repetition adjustment unit are realized in dsp chip.
Intermediate-freuqncy signal is carried out band logical digital-to-analogue conversion by the A/D sampling unit, uses 14 high speed moulds to improve signal-to-noise ratio
Number conversion core, sampling rate 40M, bandpass sampling processing mode, then data buffer storage into FIFO.
Intermediate-freuqncy signal digital mixing to base band, and is carried out low-pass filtering by the Digital Down Convert unit, passband cutoff frequency
Rate is 2MHz, and stopband cutoff frequency is 2.5MHZ, carries out 1/20 according to signal bandwidth and extracts.
The pulse compression unit carries out Barker code or linear FM signal carries out pulse compression, improves range resolution,
The present invention uses linear FM signal, using FPGA parallel processing capability, carries out matched filtering using sliding window method in the time domain
Pulse compression is realized in device processing.
The pulse accumulation unit is by the data Pingpang Memory after pulse pressure into external two panels SRAM, and ranging frame is using low heavy
Frequency mode, pulse pressure data are written in SRAM1, accumulate 256 pulses and complete ranging frame processing, frame complement mark set 0xAA is surveyed
Fast frame uses Gao Zhongying mode, and pulse pressure data are written in SRAM2, accumulates 4096 pulses and completes frame processing of testing the speed, frame completes mark
Will set 0x55.
The object detection unit reads the two-dimensional surface data after pulse pressure from table tennis in SRAM, and flag of frame state becomes
Changing indicates that FPGA completes frame data processing, and when flag of frame changes to 0x55 from 0xAA, ranging frame data are can be read in DSP, when frame mark
Will changes to 0xAA from 0x55, and the frame data that test the speed can be read in DSP.
The interframe switch control unit is entire signal processor working condition master controller, according to pulse accumulation frame
Type adjusts pulse recurrence frequency in interframe, is alternately accomplished the ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying.
The repetition adjustment unit is to complete ranging frame target detection in DSP, and obtain target unambiguous distance information, is sentenced
Whether disconnected target, which can fall in, is tested the speed in frame transmitting blind area, if fallen in transmitting blind area, fine tuning is tested the speed the frame repetition period, avoids mesh
Mark is by reflexed to transmitting blind area.
As shown in figure 3, the frame that tests the speed is by the lock-out pulse triggering hair time receiving sequence of Gao Zhongying, it is 4096 that effective impulse, which accumulates number,
Transmitting pulse time width is 16us, and the repetition period is 125us；Ranging frame sends out time receiving sequence by the lock-out pulse triggering of low repetition, effectively
Pulse accumulation number is 256, and transmitting pulse time width is 256us, and the repetition period is 2000us.
In the present invention, ranging frame is switched to when testing the speed frame, can need to wait L repetition that can just receive because of velocity ambiguity
Echo-signal, L=round (R/125*150), R are target actual range, and round is the operation that rounds up.Because of target range
It is up to 300km, L maximum value is 16, so the frame pulse accumulation since the 17th repetition that tests the speed, ranging frame is from the 2nd repetition
Start pulse accumulation.
As shown in figure 4, interframe switching control in a kind of application method based on the dual frequency solution velocity ambiguity of pulse accumulation frame
The working condition of unit comprising the steps of:
A1, interframe switch control unit are worked by synchronized-pulse control radar in ranging frame operating mode, each repetition
Period completes signal transmitting and echo reception, writes data into SRAM1 after pulse compression, completes current repetition echo data
A2 is jumped to after processing；
A2, judge whether pulse accumulation unit completes 256 effective impulse accumulation and jump to step A3, such as if completed
Fruit is not completed, and is jumped to A1 and is continued to execute；
A3, setting next frame type code 0x55, update are tested the speed the frame repetition period, and step A4 is jumped to；
A4, interframe switch control unit are worked by synchronized-pulse control radar in the frame operating mode that tests the speed, each repetition
Period completes signal transmitting and echo reception, writes data into SRAM2 after pulse compression, completes current repetition echo data
A5 is jumped to after processing；
A5, judge whether pulse accumulation unit completes 4096 effective impulse accumulation and jump to step A3 if completed,
If do not completed, jumps to A4 and continue to execute
A6, setting next frame type code are 0xAA, jump to step A1.
During A1~A6 step periodic duty, DSP reads frame type code, when frame type code changes to 0x55 from 0xAA,
Ranging frame data are started to process, two-dimensional surface target detection is carried out, the weight that non-blind area blocks is gone out according to target actual distance calculation
The frequency period；When frame type code changes to 0xAA from 0x55, the frame data that test the speed are started to process, two-dimensional surface target detection is carried out, obtains
It is practical without fuzzy speed to target.
As shown in figure 5, a kind of work based on repetition adjustment unit in the dual frequency solution velocity ambiguity method of pulse accumulation frame
State comprising the steps of:
B1, it waits FPGA to complete ranging frame pulse accumulation, when frame type code changes to 0x55 from 0xAA, jumps to step
B2；
B2, DSP read ranging frame data, correlative accumulation and detection target, obtain unambiguous distance information, jump to step
B3；
Whether test the speed repetition period of frame of B3, judgement finely tuned, if so, step B4 is jumped to, if not, jumping to step
Rapid B7；
B4, holding test the speed frame the repetition period it is constant；
B5, the target unambiguous distance being calculated according to step B2 and that finely tuned test the speed the frame repetition period, judge mesh
Whether reflexed is fallen in the transmitting blind area of Gao Zhongying mark, if so, jumping to step B6, jumps to step B10 if not；
B6, frame repetition period of testing the speed are reduced to 125us, and transmitting signal time width is reduced to 16us, and range gate is reduced to 4us,
Testing the speed the frame repetition period before being restored to adjustment, jumps to step B10；
B7, frame repetition period of testing the speed are reduced to 125us, and transmitting signal time width is reduced to 16us, and range gate is reduced to 4us,
Jump to step B8；
B8, the target unambiguous distance being calculated according to step B2 and that finely tuned test the speed the frame repetition period, judge mesh
Whether reflexed is fallen in the transmitting blind area of Gao Zhongying mark, if so, step B9 is jumped to, if not, jumping to step B10；
B9, the target unambiguous distance R being calculated according to step B2 and test the speed the frame repetition period, according to following formula into
What row was calculated that non-emissive blind area blocks tests the speed the frame repetition period, and step B10 is jumped to after the completion of calculating；
Firstly, finding out fuzzy order N, N=floor (R/125*150), wherein 125us is the repetition period, and 150m is
1us, which is delayed, corresponds to target range；
Then, each repetition period modulation amount is to consider system design margin at transmitting time width 16us to obscure order N,
Adjustment amount 1.5~2 times of appropriate adjustment again；
Finally, the repetition period for the frame that tests the speed is 125us-16us/N*K, K is coefficient, takes 1.5~2.
B10, completion test the speed the repetition period assignment of frame, are written in FPGA, jump to step B11；
B11, the processing of current ranging frame are completed.
A kind of working principle based on the dual frequency solution velocity ambiguity system and method for pulse accumulation frame of the present invention are as follows: pointing thunder
Up to the repetition period by changing pulse accumulation frame interframe, low repetition realizes that Gao Zhongying is realized to test the speed without fuzzy without ranging is obscured,
It is accumulated by the low repetition pulse accumulation of interframe switching module alternate run and high repetition pulse；In view of remote target meeting reflexed arrives
In high repetition pulse, when target is blocked in transmitting blind area, according to the period of target range micro-adjustment Gao Zhongying.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. one kind is based on the dual frequency solution velocity ambiguity system of pulse accumulation frame, characterized by comprising: transmitting subsystem, reception
Subsystem, circulator and antenna；
The transmitting subsystem further comprises baseband signal generation module and Microwave emission module；
The receiving subsystem further comprises microwave receiving module, medium frequency reception module and signal processing module；
The transmitting subsystem and receiving subsystem pass through the circulator respectively and connect with the antenna；
The Microwave emission module, baseband signal generation module, microwave receiving module and medium frequency reception module receive the signal
The synchronization pulse of processing module output, carries out transmitting-receiving timing synchronization；
The baseband signal generation module generates Barker code or linear frequency modulation baseband signal, and is output to Microwave emission module；
The Microwave emission module, is mixed the baseband signal received, is modulated to microwave frequency band, by power amplification
Afterwards, it is output to circulator；
Received echo-signal is down-converted to intermediate frequency from microwave frequency band by the microwave receiving module, and is output to medium frequency reception mould
Block；
The medium frequency reception module carries out intermediate-freuqncy signal gain control, will be output to the intermediate-freuqncy signal amplitude electricity of signal processing module
Flat control is in OK range；
The signal processing module adjusts pulse recurrence frequency in interframe, is alternately accomplished Gao Chong according to the type of pulse accumulation frame
The ranging frame accumulation of test the speed frame accumulation and the low repetition of frequency, and generate corresponding synchronization pulse and be output to other modules, together
When complete signal acquisition, pulse compression accumulation and target detection function.
2. being based on the dual frequency solution velocity ambiguity system of pulse accumulation frame as described in claim 1, which is characterized in that the signal
Processing module further comprises that A/D sampling unit, Digital Down Convert unit, pulse compression unit, pulse accumulation unit, interframe are cut
Change control unit, object detection unit and repetition adjustment unit；
Intermediate-freuqncy signal is carried out band logical digital-to-analogue conversion by the A/D sampling unit, then data buffer storage into FIFO；
Intermediate-freuqncy signal digital mixing to base band, and is carried out low-pass filtering by the Digital Down Convert unit, according to signal bandwidth into
Row extracts；
The pulse compression unit carries out Barker code or linear FM signal carries out pulse compression, improves range resolution；
The pulse accumulation unit is by the data Pingpang Memory after pulse pressure into external two panels SRAM；
The object detection unit reads the two-dimensional surface data after pulse pressure from table tennis in SRAM；
The interframe switch control unit adjusts pulse recurrence frequency in interframe, is alternately accomplished according to the type of pulse accumulation frame
The ranging frame accumulation of test the speed frame accumulation and the low repetition of Gao Zhongying；
The repetition adjustment unit completes ranging frame target detection, and obtains target unambiguous distance information, whether judges target
It can fall in and test the speed in frame transmitting blind area, if fallen in transmitting blind area, fine tuning is tested the speed the frame repetition period, and target is avoided to be arrived by reflexed
Emit in blind area.
3. being based on the dual frequency solution velocity ambiguity system of pulse accumulation frame as claimed in claim 2, which is characterized in that the number
Down-converter unit, pulse compression unit, pulse accumulation unit and interframe switch control unit are realized in fpga chip；The target
Detection unit and repetition adjustment unit are realized in dsp chip.
4. being based on the dual frequency solution velocity ambiguity system of pulse accumulation frame as claimed in claim 2, which is characterized in that the survey
It is F away from frame pulse repetition, transmitting signal time width is T1, and range gate time width is T2, and pulse accumulation number is M, the frame arteries and veins that tests the speed
Rushing repetition is F*N, and transmitting signal time width is T1/N, and range gate time width is T2/N, and pulse accumulation number is M*N, and obscuring order N is 2
Power relationship.
5. being based on the dual frequency solution velocity ambiguity system of pulse accumulation frame as claimed in claim 4, which is characterized in that the survey
It obtaining without the distance for obscuring remote target being target range R away from frame measurement, target range will appear multiple reflexed in the frame that tests the speed,
The position R' of the frame that tests the speed is fallen in target range R according to C/2/ (F*N) modulus；If modulus value is less than divided by the result of (C/2)
Emitting signal time width T1/N, C is the light velocity, and repetition adjustment unit fine tuning is tested the speed the frame repetition period, and adjustment amount and COEFFICIENT K multiply
Product is greater than transmitting signal time width, and K=floor (R/ (C/2/ (F*N))), floor are downward floor operation symbol.
6. a kind of method based on the dual frequency solution velocity ambiguity of pulse accumulation frame is suitable for any one of Claims 1 to 5 institute
It states based on the dual frequency solution velocity ambiguity system of pulse accumulation frame, which is characterized in that the interframe of signal processing module setting switches control
The working condition of unit processed comprising the steps of:
A1, interframe switch control unit are worked by synchronized-pulse control radar in ranging frame operating mode, each repetition period
Signal transmitting and echo reception are completed, is write data into wherein a piece of SRAM after pulse compression, completes current repetition echo
A2 is jumped to after data processing；
A2, judge whether pulse accumulation unit completes M effective impulse accumulation and step A3 is jumped to, if no end if completed
At jumping to A1 and continue to execute；
A3, setting next frame type code 0x55, update are tested the speed the frame repetition period, and step A4 is jumped to；
A4, interframe switch control unit are worked by synchronized-pulse control radar in the frame operating mode that tests the speed, each repetition period
Signal transmitting and echo reception are completed, is write data into another SRAM after pulse compression, completes current repetition number of echoes
According to jumping to A5 after processing；
A5, judge whether pulse accumulation unit completes M*N effective impulse accumulation and step A3 is jumped to, if do not had if completed
It completes, jumps to A4 and continue to execute；Fuzzy order N is 2 power relationships；
A6, setting next frame type code are 0xAA, jump to step A1.
7. the method as claimed in claim 6 based on the dual frequency solution velocity ambiguity of pulse accumulation frame, which is characterized in that A1~A6
During step periodic duty, frame type code is read, when frame type code changes to 0x55 from 0xAA, starts to process ranging frame number
According to progress two-dimensional surface target detection goes out the repetition period that non-blind area blocks according to target actual distance calculation；When frame type mark
Will changes to 0xAA from 0x55, starts to process the frame data that test the speed, and carries out two-dimensional surface target detection, and it is practical without fuzzy speed to obtain target
Degree.
8. a kind of method based on the dual frequency solution velocity ambiguity of pulse accumulation frame is suitable for any one of Claims 1 to 5 institute
It states based on the dual frequency solution velocity ambiguity system of pulse accumulation frame, which is characterized in that the repetition of signal processing module setting adjusts single
The working condition of member comprising the steps of:
B1, ranging frame pulse accumulation is waited for, when frame type code changes to 0x55 from 0xAA, jumps to step B2；
B2, ranging frame data, correlative accumulation and detection target are read, obtains unambiguous distance information, jumps to step B3；Ranging
Frame pulse repetition is F, and corresponding transmitting signal time width is T1, and range gate time width is T2；
Whether test the speed repetition period of frame of B3, judgement finely tuned, if so, step B4 is jumped to, if not, jumping to step
B7；
B4, holding test the speed frame the repetition period it is constant；
B5, the target unambiguous distance being calculated according to step B2 and that finely tuned test the speed the frame repetition period, judge that target is
No reflexed is fallen in the transmitting blind area of Gao Zhongying, if so, jumping to step B6, jumps to step B10 if not；
B6, the frame that tests the speed are restored to testing the speed the frame repetition period before adjusting, and jump to step B10；
B7, frame repetition period of testing the speed are reduced to 1/ (F*N), and transmitting signal time width is reduced to T1/N, and range gate is reduced to T2/N, jumps
Go to step B8；Fuzzy order N is 2 power relationships；
What B8, the target unambiguous distance being calculated according to step B2 and step B7 were finely tuned tests the speed the frame repetition period, judgement
Whether reflexed is fallen in the transmitting blind area of Gao Zhongying target, if so, step B9 is jumped to, if not, jumping to step B10；
It B9, the target unambiguous distance R obtained according to step B2 and tests the speed the frame repetition period, carries out that non-emissive blind area is calculated
What is blocked tests the speed the frame repetition period, and step B10 is jumped to after the completion of calculating；
B10, completion test the speed the repetition period assignment of frame, jump to step B11；
B11, ranging frame processing are completed.
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