Non-adaptive airborne non-side-looking radar short-range clutter suppression method

Abstract

The invention discloses a non-adaptive airborne non-side-looking radar short-range clutter suppression method. A non-adaptive short-range clutter suppression method formed by space-time filtering and space-time matching is used for suppressing airborne radar short-range clutter. The method comprises the steps of firstly arranging received signals of all channels of radar into a column vector, then performing space-time filtering to the received signals to suppress clutter energy, and finally performing space-time two-dimensional matching to realize the detection of a target. The non-adaptive airborne non-side-looking radar short-range clutter suppression method overcomes the defects that a great number of training samples which satisfy independent and identical distribution conditions are needed when the traditional adaptive clutter suppression method is applied to airborne radar, the calculation amount is great and the performance during short-range clutter suppression is seriously decreased. Compared with the traditional adaptive clutter suppression method, the method provided by the invention has the advantages that since the method is a non-adaptive method, the method is not influenced by non-uniform samples, the calculation complexity is low, the clutter suppression can be conveniently and quickly realized and the detection of the target is more greatly facilitated.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a non-adaptive short-range clutter suppression method composed of space-time filtering and space-time matching for airborne non-side-looking radars (Short-range Clutter Suppression Approach, SCSA), to suppress the short-range clutter of the non-front-looking radar and realize the detection of the target. Background technique [0002] After the Second World War, modern radar technology has experienced more than 80 years of vigorous development, and some major technological breakthroughs have made the performance of radar more perfect. Because the traditional ground-based radar is placed statically, the clutter echo does not have space-time coupling characteristics, so the ground clutter is mainly distributed near the center zero frequency. The widely used moving target indication (MTI) technology and moving target detection (MTD) Technology can realize the detecti...

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Problems solved by technology

[0003] The purpose of the present invention is: many deficiencies that exist when the existing STAP algorithm is applied to airborne radar clutter suppression, such as high computational complexity, the covariance matrix of estimating clutter requires a large number of independent and identically distributed training samples and cannot effectively To suppress defects such as short-range clutter, the present invention proposes a non-adaptive airborne radar short-range clutter suppression method (SCSA)

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