Sea radar small target detection method

Abstract

The invention discloses a sea radar small target detection method. The method specifically comprises the steps of performing distance dimension FFT processing and MTD processing on original echo data;carrying out ship speed compensation on the data after MTD processing, and extracting zero Doppler channel data after ship speed compensation as a fixed clutter clutter background; performing fixed clutter cancellation and ground clutter and sea clutter suppression, and performing MTD processing and constant false alarm processing on suppressed data to complete detection of a high-speed target; and finishing low-speed small target detection under clutter by adopting tracking processing before detection and inter-scanning correlation processing according to the Doppler frequency of the data after ship speed compensation, wherein the low-speed target is a target with a low speed set threshold value. According to the invention, the operation efficiency is improved, so that the sea surface small target detection performance is significantly improved.

Description

technical field [0001] The invention belongs to radar signal processing technology, in particular to a small target detection method for sea radar. Background technique [0002] Navigation radar is one of the important equipment of ships and plays an important role in safe navigation. Under normal circumstances, when other surveillance radars such as search radars and warning radars are in a silent state, navigation radars are not only responsible for navigation tasks, but also for monitoring small targets within close range, especially aggressive targets. These targets include small Icebergs, boats, frogmen, telescopes, and more. Slow and small targets under sea clutter background conditions have always been a problem that hinders the performance of navigation radars. There are two main reasons for this. One is the conditions of navigation radar itself. Most of the navigation radars are limited by the installation site and cost. The antenna aperture is small, the resoluti...

AI Technical Summary

Problems solved by technology

First of all, in the radar resolution unit, the echo intensity of small targets is not dominant compared with the echo intensity of sea clutter. For low-resolution radars, the echo signal strength of small targets is often weaker than that of sea clutter, so small target detection is performed directly. Very difficult; secondly, due to the low speed of motion of the slow target relative to the radar, the difference in speed from the sea clutter relative to the radar is also very small, making it difficult to find the difference from the sea clutter in the Doppler domain

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