Airborne external radiation source radar multipath clutter suppression method

Abstract

The invention discloses an airborne external radiation source radar multipath clutter suppression method. The method comprises the following steps: acquiring a plurality of echo signals and impure reference signals of an airborne external radiation source radar; uniformly segmenting the reference signal and the echo signals received by the plurality of observation antennas to obtain an equivalent reference pulse signal and an equivalent echo pulse signal; performing distance matching by using the equivalent reference signal and the equivalent echo signal to obtain a space-time snapshot signal of the to-be-detected distance unit; constructing a multipath clutter observation model; converting a multipath clutter suppression problem into a weight vector optimization problem in the multipath clutter observation model; solving an optimization problem by adopting a minimum mean square error algorithm based on an exponential forgetting window to obtain a snapshot signal of the distance unit to be detected after multipath clutter suppression; and performing target detection by using the snapshot signal of the distance unit to be detected after multipath clutter suppression. According to the method provided by the invention, the robust multipath clutter suppression performance can be obtained with low complexity.

Description

technical field [0001] The invention belongs to the technical field of communication, and specifically relates to a method for suppressing multipath clutter of an airborne external radiation source radar, which can realize multipath clutter suppression of an airborne external radiation source radar under an impure reference signal, and obtain a good moving target Test results. Background technique [0002] The external radiation source radar itself does not emit signals, and uses a third-party radiation source as a transmitting station, which has the advantages of small size, good concealment, and strong survivability. Airborne external radiation source radar refers to a radar system that applies external radiation source radar technology to an airborne platform. Due to the elevation of the receiving platform, the airborne external radiation source radar not only has the advantages of the above-mentioned traditional external radiation source radar, but also has the advantag...

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Problems solved by technology

However, the multipath clutter suppression performance of this method depends on the accuracy of the prior knowledge. When there is an error in the prior knowledge, the multipath clutter suppression ability decreases, and the target detection ability of the STAP method decreases.

Already have L 1 Norm-constrained recursive least squares (L 1 -RLS,L 1 -based Recursive LeastSquares) algorithm to build a multipath clutter sparse observation model, establish the reconstruction problem of sparse constraints, and use the RLS method to solve the weight vector to achieve multipath clutter suppression. This method can effectively avoid the multipath clutter caused by inaccurate prior knowledge. The problem of clutter suppression performance degradation, but this method has a large computational complexity, which is not conducive to real-time implementation

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