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Maneuvering target coherent detection method based on coordinate rotation and non-uniform Fourier transform

A non-uniform Fourier, maneuvering target technology, applied in the field of radar target signal estimation, can solve problems such as cross-term interference, reduce anti-noise performance, etc., achieve low computational complexity, ease computational complexity and detection performance

Active Publication Date: 2019-11-01
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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Problems solved by technology

However, the correlation is a nonlinear operation, which causes cross-term interference under multiple targets and reduces the anti-noise performance

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  • Maneuvering target coherent detection method based on coordinate rotation and non-uniform Fourier transform
  • Maneuvering target coherent detection method based on coordinate rotation and non-uniform Fourier transform
  • Maneuvering target coherent detection method based on coordinate rotation and non-uniform Fourier transform

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[0029] 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.

[0030] Long-term coherent accumulation can significantly improve the radar's ability to detect maneuvering targets and estimate motion parameters. However, the linear range migration (LRM), quadratic range migration (QRM) and Doppler frequency migration (DFM) in the coherent process seriously deteriorate the radar detection and estimation performance. In view of this, in the embodiment of the present invention, see figure 1 As shown, a coherent detection method for maneuvering targets based on coordinate rotation and non-uniform Fourier transform is provided, which includes the following content:

[0031] S101) Establishing a maneuvering target signal model for the radar signal;

[0032] S102) Perform range migratio...

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Abstract

The invention belongs to the technical field of radar target signal estimation, and particularly relates to a maneuvering target coherent detection method based on coordinate rotation and non-uniformFourier transform. The method comprises the following steps that: aiming at a radar signal to establish a maneuvering target signal model; carrying out range migration processing on the maneuvering target signal model; and through the coordinate rotation and the non-uniform Fourier transform, jointly estimating a target motion parameter. By use of the method, a contradiction between calculation complexity and detection performance can be alleviated, a second-order Keystone transform (SoKT) is used for eliminating QRM (Quadric Range Migration), a relationship between a rotation angle and Doppler frequency is combined to construct a phase compensation function, and a simulation experiment is used for verification. Compared with an existing representative algorithm, the method can obtain almost ideal detection performance by low operation complexity, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of radar target signal estimation, in particular to a method for coherent detection of maneuvering targets based on coordinate rotation and non-uniform Fourier transform. Background technique [0002] In recent years, with the rapid development of stealth aircraft and unmanned aerial vehicles (UAV), higher and higher requirements have been put forward for the detection of radar maneuvering weak targets. In order to detect such low radar cross-section (RCS) targets, long-term coherent accumulation is an indispensable means. Unfortunately, due to the high maneuverability of the above-mentioned targets, it is inevitable that the targets will undergo Linear Range Migration (LRM), Quadratic Range Migration (QRM) and Doppler Frequency Migration (DFM) within the accumulation time. These unfavorable factors will seriously affect the detection performance of traditional accumulation algorithms such as MTD. Therefor...

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Application Information

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IPC IPC(8): G01S13/58G01S7/295G01S7/41G01S7/292
CPCG01S7/2923G01S7/2955G01S7/415G01S13/582
Inventor 靳科黄洁张红敏王功明齐艳丽
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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