Channel-level clutter suppression method of MTD radar
A clutter suppression and channel technology, which is applied in the radar field, can solve the problems of high calculation amount, difficult engineering implementation, and reduced clutter suppression performance, so as to achieve low calculation amount, easy engineering implementation, and avoid low-channel clutter suppression performance changes. poor effect
Active Publication Date: 2017-05-31
CNGC INST NO 206 OF CHINA ARMS IND GRP
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But it has a high amount of calculation, especially when the number of accumulated pulses is large, it is not easy to realize in engineering
And if the notch width is not designed properly, it will also reduce the clutter suppression performance
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[0044] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0045] refer to figure 1 , the specific implementation steps of this embodiment are as follows:
[0046] Step 1. According to the prior information, set the spectral width of the clutter, and divide the low channel and the high channel.
[0047] Let the number of pulses that can be accumulated by the MTD radar be N, and the width of the clutter spectrum be Ω f , set the auxiliary channel coverage area as U f =[-αΩ f ,αΩ f ], α is the expansion coefficient, and its range is 1≤α≤1 / (2Ω f );
[0048] Define the Doppler channel sequence number as i=-N / 2,..., N / 2-1, the number of Doppler steering vectors corresponding to the Doppler channel of i is
[0049] d i =[1, exp(j2πi / N),..., exp(j2π(N-1)i / N)] T , i=-N / 2,...,N / 2-1
[0050] in(·) T Indicates the transposition, then the filter coefficient corresponding to the Doppler channel with the serial number i is ...
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The invention relates to a channel-level clutter suppression method of an MTD radar and mainly solves the problem that an existing FIR filter is excessively large in calculation quantity when the accumulated pulse number is large. The method includes the steps of firstly, setting a clutter spectral width according to prior information, and dividing a low channel and a high channel according to the spectral width; secondly, under set signal-to-noise ratio loss and side lobe level constraint, calculating a cancellation weight coefficient corresponding to the high channel; thirdly under the set signal-to-noise ratio loss and side lobe level constraint, calculating a weight coefficient corresponding to the low channel; processing a slow time echo to obtain each Doppler channel output; performing channel-level clutter suppression on each Doppler channel output according to the high channel and the low channel. The channel-level clutter suppression method has the advantages that a deep notch can be generated near Doppler zero frequency, and the method is small in calculation quantity and applicable to the clutter suppression of the MTD radar.
Description
technical field [0001] The invention belongs to the technical field of radar, relates to radar clutter suppression, can be used for radar moving target detection, and meets engineering requirements. Background technique [0002] Modern radars, especially military radars, need to complete the task of target detection in a complex working environment. The radar echo usually contains various clutter such as buildings and trees, which will lead to the loss of weak targets and false alarms. Moreover, the unstable operation of the radar system and the internal movement of the clutter will lead to the broadening of the clutter spectrum, thereby weakening the clutter suppression performance and affecting the detection of low-speed targets. Therefore, clutter suppression is an important research content in the field of radar technology. [0003] At present, effective clutter suppression methods mainly include MTI and MTD, etc. MTD mostly uses windowed FFT or FIR filter with notches...
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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 王旭蔡兴雨高剑朱思桥高恒郗蕴天
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP