Based on waveform agile space based radar target and clutter range ambiguity resolving method and system
阅读说明：本技术 基于波形捷变天基雷达目标及杂波距离解模糊方法及系统 (Based on waveform agile space based radar target and clutter range ambiguity resolving method and system ) 是由 王伟伟 杨晓超 朱江 段崇棣 李渝 黎薇萍 范一飞 李奇 于 2019-07-23 设计创作，主要内容包括：基于波形捷变天基雷达目标及杂波距离解模糊方法及系统,属于雷达技术领域。本发明针对高速目标探测的距离杂波模糊和目标测距模糊问题,提出波形捷变的天基雷达目标及杂波距离解模糊方法,雷达通过发射脉间正交波形信号,在接收回波利用发射的正交波形按照特定的次序进行逐次匹配滤波,实现不同模糊区的雷达回波分离,在有效提升信杂比的同时,完成目标的距离解模糊。(Based on waveform agile space based radar target and clutter range ambiguity resolving method and system, belong to Radar Technology field.The present invention is for high-speed target detection apart from clutterambiguity and object ranging fuzzy problem, it is proposed the space based radar target and clutter range ambiguity resolving method of waveform agile, radar passes through orthogonal waveforms signal between transmitting arteries and veins, gradually matched filtering is carried out according to specific order in the orthogonal waveforms for being received back Pohle transmitting, realize the radar return separation of different confusion regions, while effectively promoting signal to noise ratio, the range ambiguity resolving of target is completed.)
1. being based on waveform agile space based radar target and clutter range ambiguity resolving method, which comprises the steps of:
Calculate the minimum distance Rmin and maximum distance Rmax of radar beam overlay area；
Main lobe, which is calculated, according to the minimum distance Rmin and maximum distance Rmax obscures times N；
The N number of bandwidth of control radar transmitting is identical, the mutually orthogonal radar signal S of waveformi(t), i=1,2 ..., N；
The echo for receiving radar pulse carries out at matched filtering pulse compression respectively according to the matched filter time each echo of ordered pair Reason obtains the echo data of N number of different confusion regions from the near to the remote；
Clutter recognition, CFAR detection are carried out to the echo data of N number of confusion region respectively, complete target and clutter distance solution mould Paste；If target is detected m-th of confusion region, target is at m-th of confusion region, m=1,2 ..., N.
2. according to claim 1 be based on waveform agile space based radar target and clutter range ambiguity resolving method, feature Be: the minimum distance Rmin and maximum distance Rmax of the radar beam overlay area are respectively as follows: Wherein, R is space based radar orbit altitude, H is earth radius, and θ is radar pitching beam angle, and α is radar beam center downwards angle of visibility.
3. according to claim 1 be based on waveform agile space based radar target and clutter range ambiguity resolving method, feature Be: the main lobe obscure times N be greater thanSmallest positive integral, PRF be space based radar pulse weight Complex frequency.
4. according to claim 1 be based on waveform agile space based radar target and clutter range ambiguity resolving method, feature It is, the radar signal Si(t) meet: ∫ Si(t)*Sj(t)*Dt=0, i ≠ j, i and j are positive integer.
5. according to claim 1 be based on waveform agile space based radar target and clutter range ambiguity resolving method, feature It is, the matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…。
6. being based on waveform agile space based radar target and clutter range ambiguity resolving system, it is characterised in that: including
First module calculates the minimum distance Rmin and maximum distance Rmax of radar beam overlay area；
Second module calculates main lobe according to the minimum distance Rmin and maximum distance Rmax and obscures times N；
Third module, the N number of bandwidth of control radar transmitting is identical, the mutually orthogonal radar signal S of waveformi(t), i=1,2 ..., N；
4th module receives the echo of radar pulse, carries out matched filtering respectively according to the matched filter time each echo of ordered pair Process of pulse-compression obtains the echo data of N number of different confusion regions from the near to the remote；
5th module carries out clutter recognition, CFAR detection to the echo data of N number of confusion region respectively, completes target and clutter Range ambiguity resolving；If target is detected m-th of confusion region, target is at m-th of confusion region, m=1,2 ..., N.
7. according to claim 6 be based on waveform agile space based radar target and clutter range ambiguity resolving system, feature Be: the minimum distance Rmin and maximum distance Rmax of the radar beam overlay area are respectively as follows: Wherein, R is space based radar orbit altitude, H is earth radius, and θ is radar pitching beam angle, and α is radar beam center downwards angle of visibility.
8. according to claim 6 be based on waveform agile space based radar target and clutter range ambiguity resolving system, feature Be: the main lobe obscure times N be greater thanSmallest positive integral, PRF be space based radar pulse weight Complex frequency.
9. according to claim 6 be based on waveform agile space based radar target and clutter range ambiguity resolving system, feature It is: the radar signal Si(t) meet: ∫ Si(t)*Sj(t)*Dt=0, i ≠ j, i and j are positive integer.
10. according to claim 6 be based on waveform agile space based radar target and clutter range ambiguity resolving system, feature It is: the matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…。
Technical field
The present invention relates to waveform agile space based radar target and clutter range ambiguity resolving method and system are based on, belong to radar Technical field.
Background technique
It there is no space-based radar in orbit, the space-based radar related data master in open source literature data at present Concentrate on several aspects such as the research of space-based radar concept system, clutter analysis and inhibition, there is no space based radar target and Clutter range ambiguity resolving being specialized in and reporting.
For current airborne/ground-based radar, current target range ambiguity solution method is mainly set using multiple frequency group Meter, the train of pulse of the multiple and different repetitions of radar emission are carried out using " coincidence method " or " Chinese remainder theorem " method apart from solution It is fuzzy.For clutterambiguity, the mode for being based primarily upon pitching Wave beam forming carries out ambiguity solution processing, or places one's entire reliance upon good Clutter recognition performance carry out fuzzy clutter recognition.
Range ambiguity resolving is carried out using multiple frequency group for space based radar, when target velocity range is larger or satellite orbit When higher, a wave beam is resident to need to design the more repetition group of number, will affect the efficiency of radar extensive search scanning.And For clutter range ambiguity, ambiguity solution processing is carried out in the way of pitching Wave beam forming and needs great pitching dimension antenna size (tens meters or more), are difficult to realize in engineering, at this time since the increase of input noise intensity can the inspection of extreme influence radar target Survey performance.
Summary of the invention
Technical problem solved by the present invention is having overcome the deficiencies of the prior art and provide based on waveform agile space based radar Target and clutter range ambiguity resolving method and system, for existing space-based radar system clutter range ambiguity and object ranging Fuzzy problem effectively realizes clutter range ambiguity resolving, improves system and inputs signal to noise ratio；It simultaneously can be real without the design of multiple frequency group Existing target range ambiguity solution, greatly improves search lighting efficiency, has good practicability.
The technical solution of the invention is as follows: it is based on waveform agile space based radar target and clutter range ambiguity resolving method, Include the following steps:
Calculate the minimum distance Rmin and maximum distance Rmax of radar beam overlay area；
Main lobe, which is calculated, according to the minimum distance Rmin and maximum distance Rmax obscures times N；
The N number of bandwidth of control radar transmitting is identical, the mutually orthogonal radar signal S of waveformi(t), i=1,2 ..., N；
The echo for receiving radar pulse carries out matched filtering pulse pressure according to the matched filter time each echo of ordered pair respectively Contracting processing obtains the echo data of N number of different confusion regions from the near to the remote；
Clutter recognition, CFAR detection are carried out to the echo data of N number of confusion region respectively, complete target and clutter distance solution It is fuzzy；If target is detected m-th of confusion region, target is at m-th of confusion region, m=1,2 ..., N.
Further, the minimum distance Rmin and maximum distance Rmax of the radar beam overlay area are respectively as follows: Wherein, R is space based radar orbit altitude, H is earth radius, and θ is radar pitching beam angle, and α is radar beam center downwards angle of visibility.
Further, the main lobe obscure times N be greater thanSmallest positive integral, PRF is space-based The pulse recurrence frequency of radar.
Further, the radar signal Si(t) meet: ∫ Si(t)*Sj(t)*Dt=0, i ≠ j, i and j are positive integer.
Further, the matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…。
Based on waveform agile space based radar target and clutter range ambiguity resolving system, including
First module calculates the minimum distance Rmin and maximum distance Rmax of radar beam overlay area；
Second module calculates main lobe according to the minimum distance Rmin and maximum distance Rmax and obscures times N；
Third module, the N number of bandwidth of control radar transmitting is identical, the mutually orthogonal radar signal S of waveformi(t), i=1, 2,…,N；
4th module receives the echo of radar pulse, is matched respectively according to the matched filter time each echo of ordered pair Filter pulse compression processing obtains the echo data of N number of different confusion regions from the near to the remote；
5th module carries out clutter recognition, CFAR detection to the echo data of N number of confusion region respectively, complete target and Clutter range ambiguity resolving；If target is detected m-th of confusion region, target is at m-th of confusion region, m=1,2 ..., N。
Further, the minimum distance Rmin and maximum distance Rmax of the radar beam overlay area are respectively as follows: Wherein, R is space based radar orbit altitude, H is earth radius, and θ is radar pitching beam angle, and α is radar beam center downwards angle of visibility.
Further, the main lobe obscure times N be greater thanSmallest positive integral, PRF is space-based The pulse recurrence frequency of radar.
Further, the radar signal Si(t) meet: ∫ Si(t)*Sj(t)*Dt=0, i ≠ j, i and j are positive integer.
Further, the matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…。
The advantages of the present invention over the prior art are that:
(1) present invention overcomes the problems, such as existing method apart from clutterambiguity, realizes the separation for fuzzy clutter of adjusting the distance, pole The intensity for reducing input clutter greatly, to improve system clutter recognition performance；
(2) present invention overcomes the multiple frequency group design method design of pulse repetition of tradition complicated, and the filling time is long, and search efficiency is low, It is directly realized range ambiguity resolving by substance frequency, it is practical.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart.
Specific embodiment
Based on waveform agile space based radar target and clutter range ambiguity resolving method, such as Fig. 1.
Step 1 is according to orbit altitude H, earth radius R, radar pitching beam angle θ, radar beam center downwards angle of visibility α calculates the minimum distance Rmin and maximum distance Rmax of radar beam overlay area:
Step 2 assumes that radar system proposed adoption pulse recurrence frequency is PRF, calculates main lobe and obscures times N, is apparent from, N is big InSmallest positive integral, distance by radar is to there are N number of confusion regions at this time.
The N number of bandwidth of step 3 radar emission is identical, the mutually orthogonal radar signal S of waveformi(t), i=1,2 ..., N,
Wherein ∫ Si(t)*Sj(t)*Dt=0, i ≠ j.
Step 4 emits M pulse in the hypothesis correlative accumulation time of radar altogether, then receives M echo data, then to M Secondary echo is respectively adopted following matched filter order and carries out matched filtering process of pulse-compression, can obtain N number of from the near to the remote The target and clutter data of different confusion regions, matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…
From the above, it can be seen that actually i-th, i=1,2 ..., the matched filter order of N number of confusion region are first Confusion region order left-hand circular shifts i result.
Step 5 has completed the separation of the target and noise signal of different confusion regions by step 4, then respectively to N number of The echo data of confusion region carries out the processing of the follow-up signals such as clutter recognition, CFAR detection, it is assumed that target in m, m=1, 2 ..., N number of confusion region is detected, then target is at m-th of confusion region.
Based on waveform agile space based radar target and clutter range ambiguity resolving system, including
First module calculates the minimum distance Rmin and maximum distance Rmax of radar beam overlay area；
Second module calculates main lobe according to the minimum distance Rmin and maximum distance Rmax and obscures times N；
Third module, the N number of bandwidth of control radar transmitting is identical, the mutually orthogonal radar signal S of waveformi(t), i=1, 2,…,N；
4th module receives the echo of radar pulse, is matched respectively according to the matched filter time each echo of ordered pair Filter pulse compression processing obtains the echo data of N number of different confusion regions from the near to the remote；
5th module carries out clutter recognition, CFAR detection to the echo data of N number of confusion region respectively, complete target and Clutter range ambiguity resolving；If target is detected m-th of confusion region, target is at m-th of confusion region, m=1,2 ..., N。
The minimum distance Rmin and maximum distance Rmax of the radar beam overlay area are respectively as follows: Wherein, R is space based radar orbit altitude, H is earth radius, and θ is radar pitching beam angle, and α is radar beam center downwards angle of visibility.
The main lobe obscure times N be greater thanSmallest positive integral, PRF be space based radar pulse Repetition rate.
The radar signal Si(t) meet: ∫ Si(t)*Sj(t)*Dt=0, i ≠ j, i and j are positive integer.
The matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),SN(t),S1(t),S2(t),…,SN-1(t),SN(t),…
2nd confusion region: S2(t),S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),…
3rd confusion region: S3(t),…,SN(t),S1(t),S2(t),S3(t),…,SN(t),S1(t),S2(t),…
…
The confusion region N: SN(t),S1(t)…,SN-2(t),SN-1(t),SN(t),S1(t)…,SN-2(t),SN-1(t),…。
Embodiment of the present invention and effect are described in further detail below.
Usage scenario of the invention are as follows: space based radar is assumed to be detected for high-speed target, satellite altitude 1000km, Radar beam center downwards angle of visibility degree is 55 °, and radar beam width is 5 °, and the corresponding wave beam downwards angle of visibility degree in target present position is 55.2°.Space based radar target and clutter range ambiguity resolving method and step of the proposition based on waveform agile are as follows.
Step 1 is according to orbit altitude 1000km, earth radius R, under 5 ° of radar pitching beam angle, radar beam center Visual angle is 55 °, calculates the minimum distance Rmin and maximum distance Rmax of radar beam overlay area:
Rmin=1959km, Rmax=2566km can be calculated.
Step 2 assumes that radar system proposed adoption pulse recurrence frequency is PRF=4000Hz, calculates the fuzzy times N of main lobe and is It is greater thanSmallest positive integral, can calculate N value be 9, there are 9 moulds to main lobe for distance by radar at this time Paste area.
9 bandwidth of step 3 radar emission are identical, the mutually orthogonal radar signal S of waveformi(t), i=1,2 ..., N,
Wherein ∫ Si(t)*Sj(t)*Dt=0, i ≠ j.
Step 4 emits 64 pulses in the hypothesis correlative accumulation time of radar altogether, then receives 64 echo datas, then right 64 echoes are respectively adopted following matched filter order and carry out matched filtering process of pulse-compression, can obtain N from the near to the remote The target and clutter data of a difference confusion region, matched filter order are as follows:
1st confusion region: S1(t),S2(t),…,SN-1(t),S9(t),S1(t),S2(t),…,SN-1(t),S9(t),…
2nd confusion region: S2(t),S3(t),…,S9(t),S1(t),S2(t),S3(t),…,S9(t),S1(t),…
3rd confusion region: S3(t),…,S9(t),S1(t),S2(t),S3(t),…,S9(t),S1(t),S2(t),…
…
The confusion region N: S9(t),S1(t)…,S7(t),S8(t),S9(t),S1(t)…,S7(t),S8(t),…
Step 5 has completed the separation of the target and noise signal of different confusion regions by step 4, and it is miscellaneous to be apparent from main lobe at this time For intensity of wave compared with not carrying out clutter and separating, weakening is original 1/9, therefore greatly reduces noise intensity.Then respectively to 9 The echo data of a confusion region carries out the processing of the follow-up signals such as clutter recognition, CFAR detection.Target is the 1st confusion region at this time It is detected, is apparent from target and is at the 1st confusion region.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
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