Method and device for coherent detection of Doppler fuzzy targets based on periodic keystone transform
A technology of Doppler ambiguity and detection method, applied in the field of radar signal processing, can solve the problems of limited application, radar signal target error, performance loss, etc., and achieve the effect of extending the Doppler frequency range
Inactive Publication Date: 2021-04-16
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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[0004] For this reason, the present invention provides a Doppler fuzzy target coherent detection method and device based on periodic Keystone transform, which solves the problems of introducing errors, limited application, performance loss, and efficiency reduction in the existing radar signal target detection, and has great advantages. Strong application prospects
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[0039] In order to make the purpose, technical solution and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and technical solutions.
[0040] In view of the problems that the recognition efficiency and performance cannot be balanced in the existing fuzzy target coherent detection, in the embodiment of the present invention, see figure 1 As shown, a Doppler fuzzy target coherent detection method based on periodic Keystone transform is provided, including the following content:
[0041] S101) Obtain the radar signal of the measured target, and construct a Doppler fuzzy target signal model;
[0042] S102) According to the Doppler ambiguous target signal model, by eliminating the Doppler undersampling caused by the high speed of the target and / or the low pulse repetition of the radar, the searchless detection of the Doppler ambiguous target is realized. ...
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The invention belongs to the technical field of radar signal processing, and in particular relates to a method and device for coherent detection of Doppler fuzzy targets based on periodic Keystone transform. The method comprises: acquiring radar signals of a measured target and constructing a Doppler fuzzy target signal model; According to the Doppler ambiguous target signal model, the Doppler ambiguous target detection without search is realized by eliminating the Doppler undersampling caused by the high speed of the target and / or the low pulse repetition of the radar. The present invention expands the Doppler frequency range by introducing the discrete Fourier transform redundant cycle in the Keystone transform, and eliminates the Doppler undersampling caused by the high speed of the target or the low pulse repetition frequency of the radar; through the fast Fourier transform and the fast The inverse Fourier transform realizes target coherent accumulation detection, and can detect Doppler fuzzy targets without searching; and through simulation experiments and measured radar processing result data, the high efficiency and optimal detection performance of the scheme of the present invention are further verified. has certain application value.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a method and device for coherent detection of Doppler fuzzy targets based on periodic Keystone transform. Background technique [0002] In recent years, with the rapid development of stealth aircraft and Unmanned Aerial Vehicles (UAV), the problem of radar target detection has received more and more attention. In order to detect such low radar cross-section (RCS) targets, long-term coherent accumulation is an indispensable means. Unfortunately, range migration (RM) and Doppler frequency ambiguity [15-17] are unavoidable for targets during the accumulation time, which will seriously deteriorate the performance of traditional accumulation algorithms such as moving target detection (MTD). Therefore, how to overcome these two problems becomes the key to improving the radar detection capability. [0003] At present, many algorithms have been proposed to solve the abo...
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IPC IPC(8): G01S7/41
CPCG01S7/41G01S7/414
Inventor 靳科赖涛黄洁
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU