Method for imaging sliding circumferential synthetic aperture radar

Abstract

The invention discloses a method for imaging circumferential synthetic aperture radar. The method comprises the steps of S1, the pitching direction and course direction-3dB beam width, the pulse repetition frequency and circling motion center sliding distance of a radar receiving and sending antenna are calculated when the sliding circumferential synthetic aperture radar is imaged; S2, the observation scene of the radar receiving and sending antenna is controlled to conduct irradiating according to attitude parameters output by a platform inertia navigation measuring system or attitude parameters output by a radar inertia navigating measuring system and platform position information, and echo signals of the observation scene are achieved; S3, according to the imaging echo data of the sliding circumferential synthetic aperture radar, the two-dimensional or three-dimensional image of the observation scene is acquired through coherence stacking processing.

Description

technical field [0001] The invention relates to the field of microwave imaging technology for earth observation, in particular to a sliding-type circular synthetic aperture radar imaging method. Background technique [0002] In the middle and late 1990s, Falconer et al. first proposed the 3D imaging method of Circular Synthetic Aperture Radar (CSAR for short) (see Falconer D G, Moussally G J. Tomographic imaging of radar sata gathered on a circular flight path about a three-dimensional target zone.Proceedings of SPIE1995,Apr.,1995.), the radar sensor performs 360°circular motion with the platform, and the beam always points to the same scene area to observe the area, so as to realize the acquisition of three-dimensional imaging data of the observation area; , Soumekh et al. proposed the E-CSAR (Elevation Circular SAR, referred to as E-CSAR) imaging method in order to achieve a finer three-dimensional imaging capability (see Soumekh M. Synthetic aperture radar signal processi...

AI Technical Summary

Problems solved by technology

[0002] In the middle and late 1990s, Falconer et al. first proposed the 3D imaging method of Circular Synthetic Aperture Radar (CSAR for short) (see Falconer D G, Moussally G J. Tomographic imaging of radar sata gathered on a circular flight path about a three-dimensional target zone.Proceedings of SPIE1995,Apr.,1995.), the radar sensor performs 360°circular motion with the platform, and the beam always points to the same scene area to observe the area, so as to realize the acquisition of three-dimensional imaging data of the observation area; , Soumekh et al. proposed the E-CSAR (Elevation Circular SAR, referred to as E-CSAR) imaging method in order to achieve a finer three-dimensional imaging capability (see Soumekh M. Synthetic aperture radar signal processing with matlab algorithms. New York; Wiley.1999 .), but these two imaging methods are mainly to realize the all-round imaging capability of a certain range of observation scenes in the center area of ​​the circular flight trajectory. However, it is impossible to achieve large-strip high-resolution omni-directional imaging observations

At present, the sliding circular synthetic aperture radar imaging method has not been given at home and abroad. Therefore, it is still unable to solve the prominent contradiction between omni-directional high-resolution imaging and large-scale observation.

[0005] The main technical defect of the existing technology: Circular Synthetic Aperture Radar (CSAR) imaging area mainly depends on the radar antenna pitch-azimuth 3dB beam width, making its observation area stay in the center of the flight track range for a long time area, which is not conducive to the practical application of large-scale high-resolution earth observation

Images