CN102508234A - Distance calculation method based on burst pulse waveform - Google Patents
Distance calculation method based on burst pulse waveform Download PDFInfo
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- CN102508234A CN102508234A CN2011103518466A CN201110351846A CN102508234A CN 102508234 A CN102508234 A CN 102508234A CN 2011103518466 A CN2011103518466 A CN 2011103518466A CN 201110351846 A CN201110351846 A CN 201110351846A CN 102508234 A CN102508234 A CN 102508234A
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Abstract
The invention relates to the field of radar signal processing, and discloses a distance calculation method based on a burst pulse waveform. The distance calculation method specifically comprises the following steps of: acquiring target Doppler information from a burst pulse wave through a Doppler calculation algorithm; after the target Doppler information is acquired, performing Doppler compensation on a pulse echo to eliminate a phase difference among pulses caused by target Doppler information; performing pulse compression on the compensated echo to acquire a pulse compression signal, wherein the pulse compression adopts a frequency domain pulse compression method, and a pulse compression coefficient is obtained by transforming a burst pulse; performing windowing pressdown sidelobe processing on the pulse compression signal, so that a sidelobe can be well suppressed; and finally performing phase parameter accumulation on a pulse string to obtain a target distance door, and calculating target distance information. According to the method, the advantages of wide pulse and inter-pulse modulation of the burst pulse are fully developed; and aiming at remote high speed targets, distance ambiguity and Doppler ambiguity are avoided.
Description
Technical field
The present invention relates to the Radar Signal Processing technical field, relate in particular to a kind of based on the burst waveform apart from calculation method.
Background technology
Normally used waveform has high repetition waveform (Doppler is fuzzy in the prior art; Range ambiguity), middle repetition waveform (doppler ambiguity, range ambiguity) and low repetition waveform (doppler ambiguity, distance are not fuzzy); Apart from calculation method is following two kinds: 1) adopt high repetition, low repetition waveform mode; Adopt low high repetition waveform, obtain the unambiguous range information of target, adopt high repetition waveform to obtain the not fuzzy doppler information of target; 2) adopt multiple high repetition waveform simultaneously, obtain the fuzzy distance information of every kind of waveform after, adopt the ambiguity solution algorithm to obtain the range information of target.But above-mentioned two kinds of methods all need be switched between different waveforms, are unfavorable for long-time coherent accumulation.Therefore method of the prior art can not solve range ambiguity and velocity ambiguity simultaneously, and signal processing algorithm is unfavorable for that distant object detects now.
Summary of the invention
Can not effectively detect target problem to the Radar Signal Processing flow process that exists in the prior art, provide a kind of based on the burst waveform apart from calculation method.
The invention discloses a kind of based on the burst waveform apart from calculation method; Its concrete grammar is following: a kind of based on the burst waveform apart from calculation method; Its concrete grammar is: the burst ripple resolves algorithm through Doppler and obtains the target doppler information; After obtaining the target doppler information, the paired pulses echo carries out Doppler effect correction, eliminates the interpulse phase differential that is caused by target Doppler; Echo after the compensation is carried out pulse compression obtain pulse compression signal, the frequency domain impulse compression method is adopted in said pulse compression, and wherein the pulse compression coefficient is obtained by the burst conversion; The paired pulses compressed signal carries out windowing and forces down the secondary lobe processing, makes secondary lobe obtain better inhibited; Last burst is carried out the coherent accumulation, obtains the range gate of target, thereby calculates the range information of target.
Preferably; Above-mentioned burst waveform is made up of N group pulse or train of impulses; Modulated by M position Barker code, the cycle of the train of impulses of burst waveform is a low pulse repetition frequency, and is high pulse repetition frequencies in the cycle of the inner a plurality of pulses of train of impulses.
Preferably, wherein N and M select in 2,3,4,5,7,11,13.
Beneficial effect of the present invention is: obtain the range information of target through adopting the burst waveform, give full play to the advantage of burst waveform, through long-time coherent accumulation; Can improve noise (mixing) ratio to greatest extent, obtain the range information of target, range resolution is higher; The present invention has given full play to the broad pulse of burst and the advantage of arteries and veins internal modulation, under the prerequisite that obtains the target doppler information, can obtain the accurate range information of target; To remote high-speed target,, remedy the interpulse phase differential that causes by target Doppler through target is carried out Doppler effect correction; After adopting secondary lobe inhibition method; The secondary lobe of Barker code obtains better inhibited, has higher range resolution, therefore range ambiguity and doppler ambiguity can not take place.
Description of drawings
Pulse compression synoptic diagram when Fig. 1 is target Doppler fd=0.
Fig. 2 does not carry out the pulse compression synoptic diagram of Doppler effect correction when being target Doppler fd=7.2KHz.
Fig. 3 is the pulse compression synoptic diagram (not windowing) when compensating for doppler is fd=7.2KHz.
Fig. 4 is the pulse compression synoptic diagram (windowing) when compensating for doppler is fd=7.2KHz.
Fig. 5 is the pulse compression synoptic diagram (windowing) when compensating for doppler is fd=7KHz.
Fig. 6 is the pulse compression synoptic diagram (windowing) when compensating for doppler is fd=7.4KHz.
Pulse compression synoptic diagram (windowing) when Fig. 7 is two targets.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further elaboration.
The invention discloses a kind of based on the burst waveform apart from calculation method; Its concrete grammar is: the burst ripple resolves algorithm through Doppler and obtains the target doppler information; After obtaining the target doppler information; The paired pulses echo carries out Doppler effect correction, eliminates the interpulse phase differential that is caused by target Doppler; Echo after the compensation is carried out pulse compression obtain pulse compression signal, the frequency domain impulse compression method is adopted in said pulse compression, and wherein the pulse compression coefficient is obtained by the burst conversion; The paired pulses compressed signal carries out windowing and forces down the secondary lobe processing, makes secondary lobe obtain better inhibited; Last burst is carried out the coherent accumulation, obtains the range gate of target, thereby calculates the range information of target.Through adopting the burst waveform to obtain the range information of target, give full play to the advantage of burst waveform, through long-time coherent accumulation; Can improve noise (mixing) ratio to greatest extent, obtain the range information of target, range resolution is higher; The present invention has given full play to the broad pulse of burst and the advantage of arteries and veins internal modulation, under the prerequisite that obtains the target doppler information, can obtain the accurate range information of target; To remote high-speed target,, remedy the interpulse phase differential that causes by target Doppler through target is carried out Doppler effect correction; After adopting secondary lobe inhibition method; The secondary lobe of Barker code obtains better inhibited, has higher range resolution, therefore range ambiguity and doppler ambiguity can not take place.
Preferably; Said burst waveform is made up of N group pulse or train of impulses; Modulated by M position Barker code, the cycle of the train of impulses of burst waveform is a low pulse repetition frequency, and is high pulse repetition frequencies in the cycle of the inner a plurality of pulses of train of impulses.This waveform is taken into account the characteristics of low pulse repetition frequency (PRF) and high pulse repetition frequency (PRF), after handling through the method for above-mentioned steps one, possesses the advantage of no distance and velocity ambiguity; Modulated by M position Barker code; Because the pulse width broad near target, receives target Doppler's modulation at a high speed again in the train of impulses; Therefore destroyed intrinsic M position Barker code phase relation; Resolve algorithm after obtaining the target doppler information through Doppler, the paired pulses echo carries out Doppler effect correction, eliminates the interpulse phase differential that is caused by target Doppler.And, improved the detectability of Weak target in very noisy through coherent accumulation between train of impulses.Therefore range ambiguity and doppler ambiguity can not take place in the remote high-speed target in said method.
Preferably, said N selects in 2,3,4,5,7,11,13.
Further illustrate technique effect of the present invention below.
Radar parameter is: intermediate frequency 60MHz, and SF 80MHz, bandwidth is 2MHz, carries out 40 times of extractions;
2) waveform parameter is: N=13, subpulse are modulated by 13 Barker codes, and the subpulse width is 32.5us, and pulse width is 422.5us, and dutycycle is 33.3%;
3) target 1 Doppler is 7.2KHz, and distance is 63.37km; Target 2 Doppler are 7.2KHz, and distance is 63.5km.
Can know by waveform parameter; DOPPLER RESOLUTION
=75m; Consider the windowing influence, actual DOPPLER RESOLUTION
=110m.
1) can know by Fig. 1, when target Doppler fd=0, form 1 peak value after the pulse compression, but have a large amount of secondary lobes.
2) can know by Fig. 2, when target Doppler fd ≠ 0 (fd=7.2KHz), destroy 13 intrinsic between subpulse Barker code phase differential, with the pulse compression coefficient adaptation, effective pulse pressure.
3) can know by Fig. 3, after carrying out Doppler effect correction, recover 13 intrinsic between subpulse Barker code phase differential, pulse pressure the same with Fig. 1 effect (compensating for doppler is fd=7.2KHz).
4) can know by Fig. 4 that to by the result after Fig. 3 pulse pressure, carry out windowing and force down the secondary lobe processing, secondary lobe obtains better inhibited.
5) can know by Fig. 5 that the pulse compression result when compensating for doppler is fd=7KHz is the same basically with Fig. 4.
6) can know by Fig. 6 that the pulse compression result when compensating for doppler is fd=7.4KHz is the same basically with Fig. 4.
7) can know by Fig. 7 that the range resolution of this algorithm is than higher.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
- One kind based on the burst waveform apart from calculation method; Its concrete grammar is: the burst ripple resolves algorithm through Doppler and obtains the target doppler information; After obtaining the target doppler information; The paired pulses echo carries out Doppler effect correction, eliminates the interpulse phase differential that is caused by target Doppler; Echo after the compensation is carried out pulse compression obtain pulse compression signal, the frequency domain impulse compression method is adopted in said pulse compression, and wherein the pulse compression coefficient is obtained by the burst conversion; The paired pulses compressed signal carries out windowing and forces down the secondary lobe processing, makes secondary lobe obtain better inhibited; Last burst is carried out the coherent accumulation, obtains the range gate of target, thereby calculates the range information of target.
- 2. as claimed in claim 1 based on the burst waveform apart from calculation method; It is characterized in that said burst waveform is made up of N group pulse or train of impulses; Modulated by M position Barker code; The cycle of the train of impulses of burst waveform is a low pulse repetition frequency, and is high pulse repetition frequencies in the cycle of the inner a plurality of pulses of train of impulses.
- 3. as claimed in claim 2 based on the burst waveform apart from calculation method, it is characterized in that said N and M select in 2,3,4,5,7,11,13.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048695A (en) * | 2013-01-14 | 2013-04-17 | 四川九洲电器集团有限责任公司 | Detecting device based on combined barker code burst pulses |
| CN103837862A (en) * | 2014-02-20 | 2014-06-04 | 北京理工大学 | Method for restraining grating lobes in stepped frequency SAR distance direction based on image |
| CN105467383A (en) * | 2015-11-19 | 2016-04-06 | 上海交通大学 | Distance measurement method based on waveform matching in TOF technology |
| CN106093927A (en) * | 2016-05-30 | 2016-11-09 | 西安电子科技大学 | Target based on the big pulse width signal of radar tests the speed distance-finding method |
| CN112014833A (en) * | 2020-09-04 | 2020-12-01 | 上海无线电设备研究所 | High-speed target time-frequency domain detection method |
| CN114978826A (en) * | 2022-04-22 | 2022-08-30 | 四川九洲电器集团有限责任公司 | Pulse signal detection method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103048695A (en) * | 2013-01-14 | 2013-04-17 | 四川九洲电器集团有限责任公司 | Detecting device based on combined barker code burst pulses |
| CN103048695B (en) * | 2013-01-14 | 2016-05-11 | 四川九洲电器集团有限责任公司 | Based on the sniffer of combination Barker code burst |
| CN103837862A (en) * | 2014-02-20 | 2014-06-04 | 北京理工大学 | Method for restraining grating lobes in stepped frequency SAR distance direction based on image |
| CN103837862B (en) * | 2014-02-20 | 2016-03-30 | 北京理工大学 | A kind of frequency step SAR distance based on image is to grating lobe suppression method |
| CN105467383A (en) * | 2015-11-19 | 2016-04-06 | 上海交通大学 | Distance measurement method based on waveform matching in TOF technology |
| CN106093927A (en) * | 2016-05-30 | 2016-11-09 | 西安电子科技大学 | Target based on the big pulse width signal of radar tests the speed distance-finding method |
| CN112014833A (en) * | 2020-09-04 | 2020-12-01 | 上海无线电设备研究所 | High-speed target time-frequency domain detection method |
| CN112014833B (en) * | 2020-09-04 | 2023-11-14 | 上海无线电设备研究所 | High-speed target time-frequency domain detection method |
| CN114978826A (en) * | 2022-04-22 | 2022-08-30 | 四川九洲电器集团有限责任公司 | Pulse signal detection method and system |
| CN114978826B (en) * | 2022-04-22 | 2023-05-23 | 四川九洲电器集团有限责任公司 | Pulse signal detection method and system |
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