Airborne early warning radar clutter suppression method based on auxiliary channels

Abstract

The invention discloses an airborne early warning radar clutter suppression method based on auxiliary channels. The method includes: obtaining three-dimensional echo data received by an airborne early warning radar, obtaining a clutter ridge of the three-dimensional echo data, and thereby obtaining two-dimensional echo data; respectively obtaining num auxiliary channels and num search channels according to the clutter ridge of the three-dimensional echo data, obtaining spatial domain frequency vectors corresponding to the num auxiliary channels and time domain frequency vectors corresponding to the num auxiliary channels, obtaining a dimension-reduction matrix corresponding to the num auxiliary channels and a matrix corresponding to the num search channels in sequence, and thereby obtaining a dimension-reduction matrix for optimizing the auxiliary channels and a conversion matrix based on the auxiliary channels; respectively performing dimension-reduction processing of the two-dimensional echo data and the matrix corresponding to the num search channels, obtaining the echo data after dimension reduction and search channel guiding vectors after dimension reduction, obtaining filtering vectors after dimension reduction, performing clutter suppression processing of the matrix of the num search channels, and obtaining a distance Doppler graph.

Description

technical field [0001] The invention belongs to the technical field of radar clutter suppression, and in particular relates to an airborne early warning radar clutter suppression method based on an auxiliary channel, which is suitable for solving the problem of degradation of airborne early warning radar clutter suppression performance in a non-uniform clutter environment and improving its Clutter suppression performance. Background technique [0002] Airborne early warning radar has been widely valued because it can be deployed flexibly and quickly where it is needed. Its main task is to detect targets in the background of clutter, and to locate and track the detected targets. Suppression is the core of improving the performance of airborne early warning radar. Therefore, before positioning and tracking the detected target, it is first necessary to suppress the clutter or interference existing in the clutter background. If the airborne early warning radar looks down and i...

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Problems solved by technology

[0004] In view of the above existing problems in the prior art, the purpose of the present invention is to propose a method for suppressing clutter of airborne early warning radar based on auxiliary channels, which can solve the problem of poor tolerance of the traditional auxiliary channel method to airspace errors and when the number of array elements is large. Difficult-to-apply problems, and reduce the dimensionality by improving the utilization of clutter ridges, thereby reducing the number of independent and identically distributed training samples required, and can also form notches at the clutter ridges to improve the clutter suppression effect

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