Imaging method and device in star-borne mobile variable bistatic synthetic aperture radar

Abstract

The disclosure discloses an imaging method and device in a satellite-or-aircraft-borne (SAB) mobile bistatic Synthetic Aperture Radar (SAR), which includes: when an SAB mobile bistatic SAR starts imaging processing, a two-dimensional Fourier transformation is performed on a received echo signal to obtain a two-dimensional frequency domain echo signal; a radial phase of each range gate in the two-dimensional frequency domain echo signal is corrected using a radial-variable-slant-range frequency domain filter function; an orientation scaling Fourier transformation is performed on the two-dimensional frequency domain echo signal with the corrected radial phase to obtain a time domain echo signal; and each orientation correction is performed on the time domain echo signal using an orientation-variable-slant-range time domain filter function to obtain an image. With the disclosure, it is possible to countervail the dependence of the target on the slant range, thereby enabling better imaging accuracy.

Description

technical field [0001] The invention relates to the field of microwave remote sensing monitoring, in particular to an imaging method and device in a star-borne shifting bistatic synthetic aperture radar (SAR, Synthetic Aperture Radar). Background technique [0002] The satellite-mounted variable bistatic SAR is a device that installs radar transmitters and receivers on different carrier platforms to improve imaging capabilities, anti-jamming capabilities, reliability and flexibility in system design and operation. [0003] At present, the imaging method in the satellite carrier-shifting bistatic SAR is as follows: transform the received echo signal into the two-dimensional frequency domain, process the echo data in the two-dimensional frequency domain, and convert the processed echo signal Inverse 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 as follows: according to the shorte...

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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