Distributed radar main lobe interference suppression method based on EMP-CMR algorithm

A main lobe interference and distributed technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of loss, large expected signal energy, etc., and achieve the effect of avoiding suppression, efficient main lobe interference suppression method, and improving angular resolution.

Pending Publication Date: 2022-01-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, limited by the antenna size of the monostatic radar, the EMP-CMR algorithm will still cause a large loss of expected signal energy when applied to the monostatic radar

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  • Distributed radar main lobe interference suppression method based on EMP-CMR algorithm
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  • Distributed radar main lobe interference suppression method based on EMP-CMR algorithm

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0037] The invention provides a distributed radar main lobe interference suppression method based on the EMP-CMR algorithm. This method is applicable to detection scenarios such as figure 1 shown. Consider the case that the incident signal is a far-field narrow-band signal, and the incident signal includes a desired signal and P interference signals. Let the desired signal incident angle be θ 0 , the incident angle of interference signal is θ k (k=1,2,...P). The distributed radar system consists of a main radar and N-1 auxiliary radars arranged in a uniform array. The distance between each array radar is d, and the main radar is located at the Mth position. The received signal at time t is

[0038]

[0039] Where .S. is the complex envelope of the signal, A D is the distributed radar steering vector matrix, n(t) represents Gaussian white noise, s...

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Abstract

The invention discloses a distributed radar main lobe interference suppression method based on an EMP-CMR algorithm, and the method achieves the effective and steady suppression of the main lobe interference through combining the characteristic of high angle resolution of a distributed radar system and the advantage of the EMP-CMR algorithm in suppressing the main lobe interference. According to the technical scheme, the method comprises the following steps of: performing characteristic decomposition on a distributed radar receiving echo signal to obtain a characteristic vector corresponding to main lobe interference suppression; constructing a feature projection matrix according to a feature vector corresponding to main lobe interference suppression, and preprocessing echo data so as to offset a main lobe interference component; reconstructing an eigenvalue matrix and a covariance matrix, namely replacing a main lobe interference eigenvalue and a small eigenvalue in the covariance matrix by using a mean value of eigenvalues corresponding to noise signals; and solving a self-adaptive weight vector, and performing self-adaptive beam forming on the pre-processed signal to obtain a distributed radar system output signal.

Description

technical field [0001] The invention relates to the technical field of radar interference suppression, in particular to a distributed radar main lobe interference suppression method based on an EMP-CMR algorithm. Background technique [0002] With the increasingly complex electromagnetic environment, the requirements for radar anti-jamming performance are also getting higher and higher. At present, the research on sidelobe interference suppression technology has been very mature, but when the main lobe interference exists, the traditional adaptive beam processing method will cause problems such as array pattern distortion and side lobe lift, and there is a large loss of target energy, which seriously affects the Radar detection performance. [0003] In order to effectively suppress main lobe interference and reduce target energy loss, methods such as Blocking Matrix Preprocessing (BMP) and Eigen-projection Matrix Preprocessing (EMP) can be used. Among them, the BMP algorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 常少强郑梓铭侯凯悦梁振楠刘泉华龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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