Holographic SAR sub-aperture three-dimensional reconstruction method based on FOCUSS algorithm

Abstract

A holographic SAR subaperture three-dimensional reconstruction method based on an FOCUSS algorithm comprises the following steps: designing a holographic SAR flight path, and initializing radar parameters; dividing the circumferential flight path of the holographic SAR into a plurality of sub-apertures, and determining the observation geometry of the sub-apertures; performing azimuth two-dimensional imaging processing on radar echoes of different incident angle tracks by adopting a ground distance backward projection algorithm to obtain a two-dimensional projection imaging result of the three-dimensional target; selecting a two-dimensional imaging result of a certain track as a main image, taking two-dimensional imaging results of other tracks as auxiliary images, and performing registration processing on the auxiliary images and the main image; stacking the registered multi-track two-dimensional image sets along the elevation direction according to an incident angle sequence to obtaina to-be-processed three-dimensional matrix, and performing compressed sensing processing on a high-order sequence of the three-dimensional matrix by adopting an FOCUSS algorithm to obtain a three-dimensional reconstruction result; and performing coordinate transformation on the obtained three-dimensional reconstruction result to obtain a three-dimensional reconstruction result with relatively small elevation reconstruction and reconstruction position errors under a geodetic coordinate system.

Description

technical field [0001] The invention relates to the technical field of radar information acquisition and processing, in particular to a holographic SAR sub-aperture three-dimensional reconstruction method based on a FOCUSS algorithm. Background technique [0002] There are serious problems such as overlay, shadow and perspective shortening in the traditional strip SAR two-dimensional imaging results. With the advancement of modern technology and the expansion of application requirements, remote sensing mapping activities and military warfare activities have an increasing demand for the acquisition of target three-dimensional structure information. Therefore, accurately obtaining the 3D information of the observed target has important research value in applications such as military reconnaissance, map surveying and mapping, and forest information retrieval. Today's mainstream SAR 3D imaging technologies mainly include tomographic SAR (SARTomography, TomoSAR) and circular SAR...

AI Technical Summary

Problems solved by technology

Although tomographic SAR can achieve 3D reconstruction of scenes in a large observation area, but the azimuth observation angle is single, and the scattering information of the target in multiple azimuths cannot be obtained.

Images