Method and device for imaging in satellite-borne and airborne double-base synthetic aperture radar

Abstract

The invention discloses a method and device for imaging in satellite-borne and airborne double-base synthetic aperture radar (SAR). The method includes the steps that when the satellite-borne and airborne double-base synthetic aperture radar (SAR) performs the imaging process, the two-dimensional Fourier transform is performed on a received echo signal, and a two-dimensional frequency domain echo signal is obtained; by the utilization of a range slant-range variable frequency domain filtering function, range phase correction of all range gates is performed on the two-dimensional frequency domain echo signal; azimuth scaling Fourier conversion is performed on the two-dimensional frequency domain echo signal after the range phase correction, and a time-domain echo signal is obtained; by the utilization of an azimuth slant-range variable time-domain filtering function, correction in each azimuth is performed on the time-domain echo signal, and an image is obtained. The invention further discloses a device for the imaging in the satellite-borne and airborne double-base SAR. By the adoption of the method and the device, dependency, on slant ranges, of a target can be compensated, and then the imaging is more accurate.

Description

Technical field [0001] The invention relates to the field of microwave remote sensing monitoring, and in particular to an imaging method and device in a satellite airborne shiftable dual-base synthetic aperture radar (SAR, Synthetic Aperture Radar). Background technique [0002] Satellite-borne mobile dual-base SAR is a device that integrates the transmitter and receiver of the radar on different carrier platforms to improve the imaging capability, anti-interference capability, reliability and flexibility of the system design and operation. [0003] At present, the imaging method in the satellite airborne shift-variant bistatic SAR is: transform the received echo signal into a two-dimensional frequency domain, process the two-dimensional frequency domain echo data, and convert the processed echo signal Inversely transform to the time domain to get the image. In the above imaging method, the processing of the two-dimensional frequency domain echo data is: according to the shortest ...

AI Technical Summary

Problems solved by technology

However, at different positions during the voyage, the distance of receiving the echo data of the target is different. If the same reference slant distance is used to process the echo data, the dependence of the target on the slant distance cannot be compensated, which leads to Imaging is not accurate enough

[0004] It can be seen that the imaging method in the satellite-based mobile-transformation bistatic SAR in the prior art does not use different reference slant distances for the echo data due to the different distances of the echo data received at different positions during the navigation process. processing, resulting in the inability to compensate for the dependence of the target on the slant distance, resulting in inaccurate imaging

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