Multi-phase center distribution design method and device for circular scanning ground-based SAR

Abstract

The invention discloses a multi-phase center distribution design method and a multi-phase center distribution design device for a circular scanning ground-based SAR (Synthetic Aperture Radar). The method comprises the following steps: acquiring a bandwidth frequency ratio parameter and a phase center quantity parameter of a circular scanning ground-based SAR; determining the lowest sidelobe data of a point spread function of the circular scanning ground-based SAR according to the bandwidth frequency ratio parameter, the phase center number parameter and a pre-established phase change diagram,the phase change diagram being pre-established according to the point spread function of the circular scanning ground-based SAR and a grid space parameter; according to the lowest sidelobe data of thepoint spread function, determining spectrum distribution data of the circular scanning ground-based SAR; and designing multi-phase center distribution of the circular scanning ground-based SAR according to the spectrum distribution data and the observation geometry. According to the invention, the problem of high sidelobe in imaging is effectively solved, and the imaging quality is ensured.

Description

technical field [0001] The invention relates to the technical field of ground-based SAR three-dimensional imaging, in particular to a design method and device for multi-phase center distribution of circular scanning ground-based SAR. Background technique [0002] In recent years, Ground-based Synthetic Aperture Radar (GBSAR) has been used in landslide monitoring, volcano monitoring, glacier monitoring, open pit monitoring, bridge and building monitoring and other fields. However, the traditional linear track GBSAR can only acquire two-dimensional images and one-dimensional deformation, and there is a problem of "overlapping" in areas with undulating terrain, which is not suitable for complex terrain, and cannot obtain three-dimensional terrain information of the monitoring scene. [0003] Circumferential scanning ground-based SAR is a new system ground-based SAR with three-dimensional imaging capability. Compared with the traditional linear orbit ground-based SAR, the circu...

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Problems solved by technology

[0005] An embodiment of the present invention provides a design method for multi-phase center distribution of circular scanning ground-based SAR, which is used to design the multi-phase center distribution of circular scanning ground-based SAR, solve the problem of high side lobes in imaging, and ensure imaging quality. The method includes :

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