Fast coherent accumulation method for uniformly accelerated moving target based on segmentation processing
A technology of coherent accumulation and uniform acceleration, applied in the field of radar signals, can solve the problems of high computational complexity and decreased accumulation gain, and achieve the effect of improving real-time performance and improving energy focusing performance.
Active Publication Date: 2022-04-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Although the cumulative detection performance of the above methods is better, the computational complexity is higher
For this reason, Xu Jia et al. proposed a hybrid accumulation method, which sequentially realizes coherent accumulation within a segment and non-coherent accumulation between segments through segment processing, but the accumulation gain of this method will decrease as the length of the sub-segment becomes shorter
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[0035] The present invention mainly adopts the method of Matlab simulation experiment to verify, and verifies the correctness and effectiveness of the present invention on the scientific computing software MatlabR2014a. Combine below Figure 1-5 The specific implementation of the present invention is given.
[0036] Such as figure 1 Shown, method of the present invention comprises the following steps:
[0037] Step 1: Record the chirp waveform multi-pulse baseband echo signal received by the radar as is the fast time, t ω is the slow time, t ω =ωT r (ω=0,1,...,W-1), W and T r represent the total number of pulses and the pulse repetition interval, respectively.
[0038] Define uniform acceleration target and radar at t ω The moment distance is: where r 0 Indicates the initial distance between the target and the radar; k 1 and k 2 are the velocity and acceleration of the target, respectively. Set in this embodiment: r 0 = 50km, k 1 =102m / s,k 2 =10m / s 2 , SNR...
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The invention discloses a segment processing-based fast coherent accumulation method for a uniformly accelerated moving target, which is applied to the technical field of radar signals and aims at the problem of low coherent accumulation performance in the prior art. The method comprises the following steps: firstly, performing pulse compression processing on a baseband echo signal; then, dividing the echo signal after pulse compression into a plurality of uniform time segments, and ensuring that second-order range migration and Doppler migration caused by acceleration in each time segment can be ignored; then, first-order range migration in each time period is corrected, and coherent accumulation is carried out on target energy in the corrected period through slow-time fast Fourier transform; secondly, correcting second-order range migration and Doppler migration in a compensation time period, and performing phase-coherent accumulation on compensated multi-section signal energy; and finally, performing inverse fast Fourier transform along a fast time frequency direction to obtain a coherent accumulation result of energy of all time slices. According to the method, the energy focusing performance of the radar on the uniformly accelerated target can be effectively improved.
Description
technical field [0001] The invention belongs to the technical field of radar signals, in particular to a coherent accumulation technology of uniformly accelerating moving targets. Background technique [0002] With the rapid development of aerospace technology and the wide application of stealth technology, the effective detection of moving targets has become a difficult problem in the field of radar signal processing. Long-term accumulation of technology can significantly improve the detection performance of radar. However, the complex motion of the target (including velocity and acceleration) will lead to the first-order / second-order range migration and Doppler migration, resulting in the loss of cumulative detection performance of the radar. Therefore, it is necessary to realize effective correction and compensation for range migration and Doppler migration before coherent accumulation. [0003] In order to correct the first-order distance migration caused by the target...
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IPC IPC(8): G01S7/40G01S7/41G01S7/292
CPCG01S7/40G01S7/41G01S7/292
Inventor 孙智陈海旭蒋兴涛蒋千李小龙樊万清崔国龙孔令讲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA