SAR-GMTI Clutter Suppression Method in the Descending Section of a Hypersonic Vehicle

Abstract

The invention discloses a method for suppressing SAR-GMTI clutter of a hypersonic vehicle descending branch. The method comprises steps of: establishing a radar motion geometric model of the hypersonic aircraft descending branch, wherein the radar includes N antenna channels, P is any one motion target in a scene where the radar is located, expressing the instantaneous slope distance between the nth antenna channel and the motion target P as Rn(ta) to obtain echo signals of N equivalent phase center channels; acquiring the distance frequency domain-orientation time domain expression form of the echo signals of N equivalent phase center channels subjected to distance compression, performing phase compensation to obtain the distance frequency domain-orientation time domain echo signals of the N equivalent phase center channels subjected to phase compensation, successively computing the echo signals of N equivalent phase center channels of a distance Doppler domain, the echo signal of the motion target P of the distance Doppler domain, and the clutter signal of the distance Doppler domain, computing the optimal weight coefficient vector of time-space adaptive clutter suppression so as to finally obtain the echo signal of the motion target P subjected to clutter suppression.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a method for suppressing SAR-GMTI clutter in the descending section of a hypersonic vehicle, that is, a method for suppressing synthetic aperture radar-ground moving target detection (SAR-GMTI) clutter in the descending section of a hypersonic vehicle. It is suitable for the suppression of SAR-GMTI clutter in the descending section of hypersonic aircraft, so as to complete the detection of moving targets in SAR imaging. Background technique [0002] Synthetic Aperture Radar (SAR) imaging technology was first developed in the 1950s, which can simultaneously provide high two-dimensional resolution, including high range resolution and high azimuth resolution, and then be able to image radar targets; Aperture Radar-Ground Moving Target Detection (SAR-GMTI) combined with clutter suppression technology can complete the detection of ground moving targets under the influence of strong grou...

AI Technical Summary

Problems solved by technology

However, unlike traditional platforms, the radar motion state in a hypersonic vehicle (HSV) is complex and usually has a jumping motion state, and the acceleration time in the jumping phase is usually very short, accounting for only 1 / 6 or 1% of the entire jumping phase. / 9, so the synthetic aperture radar (HSV-borne SAR) carried by the hypersonic vehicle (HSV) can only be set to work in the descent phase, and when it enters the descent phase, it will face strong ground clutter, and then It brings difficulties to moving target detection and subsequent tracking, imaging and recognition.

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