Airborne radar space time adaptation processing method based on environment dynamic perception

Abstract

The invention belongs to the technical field of airborne radar space time adaptation processing, and particularly relates to an airborne radar space time adaptation processing method based on environment dynamic perception. The airborne radar space time adaptation processing method based on the environment dynamic perception includes concrete steps: setting a work mode of an airborne radar to be an MIMO (multiple input multiple output) mode, using a receiving array to receive a time domain return signal Y, and representing a clutter scattering coefficient vector in an airborne radar observation area as gamma; marking the position of a jth clutter block of an ith distance unit in the airborne radar observation area as Aij; building a sparse model, and representing a basis matrix corresponding to observation data Y after discretization as H; obtaining vector estimation of the clutter scattering coefficient vector gamma of the airborne radar observation area by solving the sparse model, setting the work mode of the airborne radar to be a phased array mode so as to obtain the distance r'i between the clutter block on the position Aij and the airborne radar and an corresponding return signal arrival angle; obtaining a clutter covariance matrix of units with distance to be detected, and performing space time adaptation processing on a return signal which is received when the airborne radar works under the phased array mode.

Description

technical field [0001] The invention belongs to the technical field of airborne radar space-time adaptive processing, in particular to an airborne radar space-time adaptive processing method based on environmental dynamic perception, which can be used for clutter suppression under a non-uniform clutter background. Background technique [0002] Compared with ground-based radar, airborne radar increases the radar's visual distance due to the elevation of the platform position, especially for low-altitude and ultra-low-altitude targets, and its visual distance is greatly increased. However, on the one hand, due to the expansion of the detection range of the airborne radar, the airborne radar clutter area is expanded, and compared with the ground-based radar, the radar beam of the airborne radar has a larger grazing angle to the ground, which makes the clutter in the echo The wave power is greatly increased; on the other hand, since the platform is moving, the clutter of the air...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to changes in the external environment, there is a mismatch between the prior information and the actual environment. In this case, the use of prior information will not only not improve the clutter suppression performance of the radar, but may even degrade its performance.

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