High-squint Multichannel SAR Imaging in Azimuth Based on Chinese GF-3 Satellite Data

Compared with the broadside imaging mode in multichannel SAR system, high-squint imaging mode in azimuth would be much more flexible to achieve high-resolution and wide-swath (HRWS) imaging and greatly improve the efficiency of application for Earth dynamic monitoring.However, the high-squint angle would result in more complex problem of spectrum folding after down-sampled, which would pose new challenge to the unambiguous signal reconstruction for multichannel SAR system. In this paper, the processing procedure of the unambiguous signal reconstruction for high-squint multichannel SAR is proposed. Then, an onboard experiment based on Chinese GF-3 dual receiving channel (DRC) spaceborne SAR system were successfully carried out to validate the practicality of high-squint imaging mode for multichannel SAR system in azimuth in January 2022. Experimental data validates the effectiveness of the proposed processing procedure.