Satellite-borne DBF processing method and device based on multi-channel group delay and storage medium

Abstract

The invention provides a satellite-borne DBF processing method and device based on multi-channel group delay and a storage medium. The method comprises the steps: carrying out time-varying phase shift weighting on initial echo signals received by all channels, and obtaining first echo signals corresponding to all the initial echo signals; determining a target time delay reference point, and determining the channel number of time delay according to the target time delay reference point; determining multi-channel group delay based on the channel number of the delay; performing time delay on each first echo signal by adopting the multi-channel group time delay to obtain multiple paths of echo signals after time delay; and combining the multiple paths of echo signals to obtain a target echo signal. According to the embodiment of the invention, the method comprises the steps: carrying out the time delay processing of a signal after the time-varying phase-shift weighting processing of each channel through employing multi-channel group delay, and obtaining a multi-channel echo signal after the time delay processing; and finally, combining the multiple paths of echo signals to obtain a target echo signal with less energy loss. Thus, the problem of receiving gain attenuation is overcome.

Description

technical field [0001] The present application relates to the technical field of radar signal processing, in particular to a multi-channel group delay-based spaceborne DBF processing method, device and storage medium. Background technique [0002] Synthetic Aperture Radar (SAR for short) is an active microwave remote sensing radar that uses range pulse compression and azimuth Doppler effect for imaging. It plays a particularly important role in the field of earth observation. Geometric resolution and swath width are two important indicators of SAR system. However, limited by the minimum antenna area, traditional SAR systems cannot simultaneously acquire high-resolution and wide swath images. [0003] Range-oriented multi-channel technology combined with digital beamforming (DBF) is the key technology for spaceborne SAR system to overcome the limitation of minimum antenna area and realize high-resolution wide swath imaging. This technology uses time-varying weighting proces...

AI Technical Summary

Problems solved by technology

In this way, the delayer in the traditional DBF has been difficult to alleviate the influence of PEL, resulting in the performance degradation of the DBF processor and the reduction of the receiving gain of the SAR system

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