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Method for synchronously inhibiting radar clutter and multiple interferences based on power distinction

A clutter and power technology, applied in the field of moving target detection, to achieve strong applicability and correction performance, and the effect of suppressing industrial interference

Inactive Publication Date: 2009-09-16
PLA AIR FORCE RADAR COLLEGE
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  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the difficulties and problems faced by the sky-wave over-the-horizon radar system in normal operation, and overcome the shortcomings and deficiencies of the existing methods

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  • Method for synchronously inhibiting radar clutter and multiple interferences based on power distinction
  • Method for synchronously inhibiting radar clutter and multiple interferences based on power distinction

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Embodiment Construction

[0035] The existing signal processing theory shows that the eigenvectors obtained by eigendecomposition of the signal coherence matrix can be divided into mutually orthogonal signal subspaces and noise subspaces according to the size of the corresponding eigenvalues, and the signal subspace contains the information of all signal manipulation vectors . The latest research shows that within the signal subspace, there is a corresponding relationship between the feature vector and the signal manipulation vector, and the signal feature vector can independently reflect the information of the corresponding signal manipulation vector, provided that there is a difference in power between the signals, and this reflection The degree of "independence" is proportional to the signal power difference.

[0036]In the sky-wave over-the-horizon radar system, usually the clutter power is the largest, followed by the interference power, and the target signal power is the smallest. Therefore, acc...

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Abstract

The invention discloses a method for synchronously inhibiting radar clutter and multiple interferences based on power distinction, and is suitable for a signal processing system of sky-wave over-the-horizon radar. The method realizes the separation of strong clutter, interferences and target signal using the power difference among the clutter, interferences and target signal, and can effectively inhibit clutter and multiple interferences including transient interference and shared-frequency asynchronous interference. The specific steps are showed in the figure 1. Compared with the prior method, the method does not need to detect and analyze the clutter and multiple interferences complicatedly, has obvious effect on the randomly varied interferences of all parameters and clutter, and has strong applicability. The invention uses the separated strong clutter as a standard signal to correct phase pollution, can realize phase correction and inhibit the clutter and interferences synchronously, and simplify the signal processing process of the sky-wave over-the-horizon radar. The invention is not limited to the sky-wave over-the-horizon radar system, can be widely applied to multiple large-scale phased array radars, and has wide application value.

Description

technical field [0001] The invention relates to a simultaneous suppression method of clutter and multiple disturbances in the field of radar signal processing, which is suitable for the signal processing system of sky wave over-the-horizon radar, and can be used for asynchronous interference, transient interference, phase pollution, main clutter Moving object detection against wave background. At the same time, the core theory and method can also be applied to other clutter and various signal processing systems that require interference suppression. Background technique [0002] The sky-wave over-the-horizon radar uses the ionosphere's reflection of electromagnetic waves to detect targets beyond the visual range. It has a long working distance and a large coverage area, and can provide strategic early warning intelligence information. However, due to the special working system, it is easily affected by various interferences and clutter, resulting in the following problems: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
Inventor 陈建文鲍拯陈辉吴志文
Owner PLA AIR FORCE RADAR COLLEGE
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