Corrective STAP (Space-time Adaptive Processing)-based airborne radar high-speed airmobile target detection method

Abstract

The invention discloses a corrective STAP (Space-time Adaptive Processing)-based airborne radar high-speed airmobile target detection method. The method comprises the following steps of: performing clutter suppression on echo data; correcting target range migration by using keystone conversion; estimating target acceleration by using corrective STAP; compensating Doppler migration item according to the acceleration; and finally performing space-time two-dimensional wave beam formation to realize target energy accumulation. By using the method, the influence on clutter distribution characteristic during high-speed target range migration of Doppler ambiguity existing in correction by directly utilizing the keystone conversion can be avoided to further reduce the problem of STAP performance,and the target acceleration can be accurately estimated by using the corrective STAP, so that target Doppler migration compensation is facilitated to accordingly realize effective accumulation of target energy. In addition, the method has the advantages of simple steps, accurate detection result, suitability for moving target detection of a target with serious range migration, Doppler ambiguity and Doppler migration and the like.

Description

technical field [0001] The invention belongs to the technical field of aviation, and in particular relates to a method for detecting a high-speed air maneuvering target of an airborne radar based on a modified STAP. Background technique [0002] In the field of aviation technology, the main difficulties in detecting high-speed air maneuvering targets (only considering the situation of radial acceleration) are as follows: a. When the airborne radar looks down, the weak target signal is often submerged in the Doppler due to the movement of the platform; In the strong ground clutter with widened spectrum, the method of Doppler processing only using the echo signal (time-domain sampling signal) received by a single channel cannot suppress the ground clutter with the same Doppler frequency as the moving target. b. The high-speed movement of the target will cause serious distance walking, which will lead to a decrease in the target accumulation effect. c. The secondary phase term...

AI Technical Summary

Problems solved by technology

However, this method uses the Wigner-hough transform to estimate the acceleration of the target. When the number of coherent processing pulses is small, the Wigner-hough transform has a large error in estimating the target acceleration, which leads to the unsatisfactory compensation effect of the Doppler walking term.

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