Two-dimensional multi-pulse canceller for MIMO radar

Abstract

The invention discloses a non-adaptive clutter cancellation method for a vehicle-mounted MIMO radar and mainly solves the problems of low clutter cancellation performance and large computing amount of the prior art. In the invention, the clutter spectrum broadening caused by clutter fluctuation is taken into consideration and more degree of freedom are used, so as to improve the clutter cancellation performance of the prior art considerably. The method comprises: firstly, establishing a matrix vector model of a ground clutter signal, computing a residual clutter signal, minimizing the energy of the residual clutter signal, obtaining a coefficient matrix and consequently obtaining the result of filter design; and secondly, writing echo data of a plurality of continuous pulses as a long vector, and processing clutters by using a filter to cancel a major part of the clutters. The method is used for space-time two-dimensional cancellation of ground clutters before the conventional space-time cascade processing method and the traditional adaptive processing method. The method is suitable for both sidelooking radars and non-sidelooking radars, and has high clutter cancellation performance.

Description

technical field The invention belongs to the technical field of radar, and is specifically a two-dimensional multi-pulse canceller, which can be applied to a multi-input multi-output MIMO radar system to perform ground clutter before the conventional space-time cascade processing method and the traditional adaptive processing method. Space-time two-dimensional cancellation is not only applicable to front-looking and side-looking radars, but also suitable for non-front-looking and side-looking radars. Background technique For airborne radar to detect and identify targets from a strong clutter background, the problem of clutter suppression must be solved first. Due to the space-time coupling of ground clutter signals received by the antenna array due to the movement of the radar platform, some commonly used clutter pre-filtering methods are only effective for main clutter suppression, and the sidelobe clutter is scattered in the main clutter due to the space-time coupling char...

AI Technical Summary

Problems solved by technology

In recent years, some scholars have proposed a space-time two-dimensional two-pulse clutter canceller TDPC suitable for phased arrays, and used it as a pre-filter for conventional moving target detection MTI methods and dimensionality reduction STAP processing methods. Although the canceller can achieve partial clutter cancellation and reduce the amount of calculation, the cancellation performance in the direction of the clutter ridge is not significant, especially in non-front-looking side-looking radars, the cancellation performance is further reduced

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