Squint InSAR ground moving target detection method based on rotatable forward-looking array

Abstract

The invention provides a squint InSAR ground moving target detection method based on rotatable forward-looking array. The method includes the steps of adding a servo rotary bench to the rear end of a radar radio frequency portion, controlling the angle theta a between an SAR system baseline and the vertical direction, making the baseline, track and wave beam central direction on a same plane by rotatably installing the SAR system, making the forward-looking array of the vertical baseline equivalent to an along-track multi-channel SAR system with the equivalent baseline length being Btana, receiving target echo signals, and estimating the target speed and position according to the equivalent baseline length Btana. The angle between the baseline and an imaging plane is configured by rotating one-dimensional track array, thereby solving the problem of target height and speed interference phase coupling. Fewer elements are needed, and the signal processing method is simple. The method is applicable to suppressing complex terrain clutters and has high practical engineering valve.

Description

technical field [0001] The invention belongs to the technical field of radar system design and radar signal processing, relates to an interference SAR ground moving target detection technology, in particular to a squint InSAR ground moving target detection method based on a rotatable forward-looking array. Background technique [0002] Ground Moving Target Indication (GMTI) is one of the important functions of modern radar. With the wide application of Synthetic Aperture Radar (SAR), moving target detection based on SAR platform is widely used in both military and civilian applications. are of great significance. [0003] Along-track interferometric multi-channel SAR-GMTI is the most widely used SAR-GMTI mode at present, and it has excellent detection ability of slow and small targets. However, many actual SAR system baselines cannot be deployed along the track, but they also urgently need to have the ability to detect ground moving targets. For example, fire control, earl...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to solve the problem of moving target detection under complex terrain with a vertical baseline, and to provide a method for detecting a ground moving target based on a rotatable forward-looking array based on squint InSAR, which is based on the analysis of the interferometric phase of the vertical baseline target , by rotating the forward-looking array, the sensitivity function to the height target is zero while ensuring the speed sensitivity of the target, and the vertical track baseline is equivalent to the baseline along the track in the case of forward-looking squint, and then, through the conventional The method of DPCA-ATI along the track realizes the detection and localization of moving targets

Images