Clutter inhibition method of airborne external radiation source radar

Abstract

The invention belongs to the technical field of communication, and discloses a clutter inhibition method of an airborne external radiation source radar. The method comprises the following steps: obtaining signals received by the airborne external radiation source radar, wherein the signals comprises reference signals, first echo signals and second echo signals; respectively segmenting the reference signals, the first echo signals and the second echo signals to obtain segmentation reference signals and two paths of segmentation echo signals; according to the segmentation reference signals, respectively performing range-direction compression on the two paths of segmentation echo signals to obtain range-direction compression signals of the two paths of segmentation echo signals; respectively performing phase compensation on the range-direction compression signals of the two paths of segmentation echo signals to obtain phase compensation signals of the two paths of the segmentation echo signals; and performing channel registering on the phase compensation signals of the two paths of the segmentation echo signals, and performing subtraction on the two paths of the segmentation echo signals after the registering so as to inhibit clusters and reserve object information. The method provided by the invention solves the problem of neglect of incomplete cancellation of the clusters during migration of the reference signals in the prior art.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a clutter suppression method for airborne external radiation source radar, which can realize the suppression of static clutter in the case of long-term accumulation of airborne external radiation source radar, and obtain good moving target detection results . Background technique [0002] External radiation source radar refers to a radar system that uses non-cooperative radiation signals such as radio (FM), TV, and satellites as a transmission source, and does not transmit signals itself. It has the advantages of low cost, small size, and strong survivability. The development of target detection, positioning, tracking and other detection technologies of traditional external radiation source radar has been relatively mature. The airborne external radiation source radar is to apply the external radiation source radar technology to the airborne platform. Due to the e...

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Problems solved by technology

[0004] In view of the problems referred to above, the object of the present invention is to provide a method for suppressing clutter of an airborne external radiation source radar, in which the external radiation source radar clutter is suppressed under the condition of the receiving platform moving, and the method performs two-way echo signals respectively 2-dimensional time-sharing matched filter, before using the DPCA algorithm, the preprocessing of the two-way echo signals is performed to suppress the static clutter. At this time, the clutter components of the two-way echo signals are consistent, and the clutter is better filtered out , reducing the false alarm caused by clutter, reducing the detection threshold increase caused by clutter, which is beneficial to target detection, and solves the problem of incomplete clutter cancellation when the reference signal migration is not considered in the prior art

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