Distance blur clutter suppression method based on pitch frequency diversity STAP

Abstract

The invention discloses a distance blur clutter suppression method based on pitch frequency diversity STAP. The method comprises the steps that down-conversion and matched filtering are sequentially carried out on a detected received signal to sequentially acquire the pitch-azimuth-time three-dimensional clutter snapshot model of each range gate, the pitch frequency expression of each range gate and the corresponding clutter compensation item; an appropriate clutter compensation item is used to separate distance blur clutters of different distance rings; due to the fact that pitch frequencies of different distance blur clutters are separated from each other, the distance blur clutter of each distance ring needs a filter with corresponding coefficients for filtering, and then all distance blur clutters are inhibited to solve the problem of distance blur; and finally, after the pitch distance blur clutters are separated, pitch frequency spectrum distribution and digital frequency periodicity are used to acquire the selection criteria of frequency increment. According to the invention, the freedom of a system and the operation complexity are not increased.

Description

technical field [0001] The invention belongs to the technical field of radar signal clutter suppression, in particular to a range ambiguous clutter suppression method based on pitch frequency diversity STAP, that is, a range ambiguous clutter suppression method based on pitch frequency diversity STAP (Space-Time Adaptive Processing, STAP) The wave suppression method is mainly applicable to the separation and suppression of range-ambiguous clutter in practical engineering. Background technique [0002] In recent years, ground moving target detection (Ground Moving Target Indication, GMTI) of airborne / spaceborne radar system has attracted widespread attention in urban traffic control and target tracking and detection; for the application background of strong clutter in airborne / spaceborne radar, Especially under the application background of background noise and interference, scholars at home and abroad have proposed space-time adaptive processing (STAP) algorithm and its corr...

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