Digital Beamforming with Assistance of External DEM for Spaceborne High-Resolution Wide-Swath SAR

Le résumé fourni par la source

Future SAR missions may have a great demand for high-resolution wide-swath imaging. Digital beamforming with SCAN-ON-RECEIVE (SCORE) in elevation is a powerful technique, which is characterized by using a narrow and high gain receive beam to follow the echoes backscattered from the illuminated areas timely. Generally, it is beneficial to increase the pulse duration and antenna size to improve the signal-to-noise (SNR) ratio. However, the pulse extension loss (PEL) would also be more significant, especially in topographic variation situation. This paper focuses on PEL compensation in presence of terrain height variations. With assistance of the external DEM, the numerical representation of actual DoA is established first, and an innovative SCORE approach is proposed by applying appropriate time varying weights to each subband of the echo. This approach can achieve better radiometric quality. Theoretical analysis and simulation results are also presented to validate the effectiveness of the proposed scheme.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.