Method for suppressing multipath clutters of through-the-wall radar

Abstract

The invention relates to a method for suppressing multipath clutters of a through-wall radar, and belongs to the technical field of through-wall radars. Firstly a moving target indicator (MTI) is adopted to filter and suppress strong static clutters including wall back waves and the like, the back waves of moving objects are protruded, and detection of cell average-constant false alarm rate (CA-CFAR) is carried out; secondly range delay information of detected real objects and the multipath clutters is cohesively extracted in the distance direction; then corresponding range delay of multipath channels is forecast by adoption of wall position information and detected object distance delay; and finally, detected objects are separated through the range of distance delay of the detected multipath channels, and the multipath clutters are screened and suppressed. Based on a single-shot single-receiving antenna allocation, back wave data of the through-wall radar are detected, the distance information of the moving objects is extracted, meanwhile interference with a radar system by the multipath clutters is suppressed, detecting performance of the radar system can be improved significantly, and impact on the radar system by the multipath clutters is suppressed.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar, in particular to multipath clutter suppression technology in through-wall radar imaging. Background technique [0002] Multipath clutter refers to the propagation of a radio signal from a transmitting antenna to a receiving antenna via several different channel paths. Since through-the-wall radar needs to perform perspective detection on closed buildings behind wall obstacles, it is interfered by electromagnetic waves reflected by the building walls, resulting in serious multipath clutter. The multipath clutter will affect the detection performance of the through-wall radar in two aspects. First, the multipath clutter will weaken the energy of the target echo and reduce the signal-to-noise ratio of the target echo. Second, the multipath clutter will Generate false targets and interfere with the normal operation of the radar system. Therefore, multipath clutter suppression in through-...

AI Technical Summary

Problems solved by technology

For the image defocusing problem caused by multipath echoes of the human body, the University of Nice in France uses TRM (Time Reversal Mirror) technology to refocus the multipath echoes to solve the problem of image defocusing. The experimental test has limited suppression effect on image defocusing

Villanova University in the United States achieves the effect of improving the signal-to-noise ratio by multiplexing multipath clutter. It can even multiplex multipath clutter and use single-shot single-receive radar to locate the target, but it is easy to cause the loss of the real target. Limited effects in practical engineering applications

In summary, imaging-based multipath clutter processing methods have great limitations in practical applications

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