Medium and long range frequency domain fast imaging method and device for spiral arm scanning ground SAR

Abstract

The invention discloses a medium and long range frequency domain fast imaging method and device for a spiral arm scanning ground SAR. The method comprises steps that an echo time domain signal of thespiral arm scanning ground SAR is acquired; a distance between an observation target and a rotation center is determined; if the distance between the observation target and the rotation center exceedsa threshold, an echo frequency domain signal is acquired according to the echo time domain signal; the echo frequency domain signal is subjected to range migration correction to the range migration correction result; the range migration correction is subjected to phase correction, and the imaging result of the spiral arm scanning ground SAR is acquired according to the phase correction result. The method is advantaged in that the phase error caused by distance change is effectively compensated, remote range imaging quality is improved while calculation efficiency is guaranteed, a problem of relatively large imaging result error in the frequency domain imaging process is avoided, and high-efficiency high-quality remote range imaging of the spiral arm scanning ground SAR is achieved.

Description

technical field [0001] The invention relates to the technical field of microwave imaging for earth observation, in particular to a method and device for fast imaging in the mid-to-long range frequency domain of a radial-arm scanning ground-based SAR. Background technique [0002] Ground-based Synthetic Aperture Radar (SAR) imaging has important applications in deformation disaster monitoring, new radar imaging system and method verification, etc. Compared with airborne SAR and spaceborne SAR, it has the advantages of flexibility, low cost, Real-time and efficient features. [0003] The synthetic aperture of the spiral arm scanning ground-based SAR is generated by the rotation of the antenna attached to the end of the arm, which ensures that the field of view of the system can cover a wide range of scenes in one observation, thereby effectively improving the ground monitoring efficiency of the system. When performing ground monitoring, the ground-based SAR with radial arm sc...

AI Technical Summary

Problems solved by technology

In order to achieve fast real-time imaging, the prior art also proposes a frequency-domain imaging method for the radial-arm scanning ground-based SAR system. This method can effectively improve the calculation efficiency, but there are large errors in the imaging results, which seriously affect the quality of medium and long-distance imaging.

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