A Method of Interpolation Clutter Map Based on Local Threshold Judgment

Abstract

The invention relates to an interpolation clutter map method based on local threshold judgment, belonging to the technical field of radar signal processing. First, measure the statistical characteristics of the radar background and perform data compression processing on the radar echo video modulo signal; then calculate and access the energy average value, variance, and average number of thresholds in the clutter map unit of the previous antenna scanning cycle; Then compare with the energy average value, variance and the average number of the threshold value of the corresponding clutter map unit in the current scanning cycle to select and mark the clutter map unit; then set the corresponding mark according to the specific threshold judgment situation and according to the energy and stability The change ratio is the optimal forgetting factor; finally, the weight coefficient is determined according to the deviation stability of the clutter map for interpolation processing of adjacent clutter map units, and the clutter is iteratively updated according to the antenna cycle. In particular, it involves solving the problem of large target signals covering small targets and improving the detection probability of radar for slow and small targets.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing. Background technique [0002] With the rapid development of modern radar signal detection technology, the clutter suppression methods for stable and uniform conditions are becoming more and more mature. However, for conventional alert search radars, especially when the weather is fine and sunny, the radar wave propagation is likely to be greater than its maximum effective distance on the sea surface under atmospheric duct conditions, and the radar receiver receives multiple echoes. And the problem of missed detection of slow and small targets under the background of dense distribution of various strong clutter in the detection area is powerless. To solve the above problems, simply reducing the detection threshold will cause excessive load on the primary display of the radar and subsequent radar data processing, which will seriously affect the start of the subsequent trajectory an...

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Problems solved by technology

[0004] The purpose of the present invention is to address the defects in the background technology, and propose a method for effectively improving the detection probability of slow and small targets in the strong clutter background, especially near the spatial position of large and small targets, so as to overcome the slow speed in the processing process of the prior art. The problem of high false alarm probability of fast and small target detection

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