Digital Beamforming Based RFI Mitigation for Synthetic Aperture Radar

Bollian, Tobias ; Osmanoglu, Batuhan ; Rincon, Rafael F ; Lee, SeungKuk ; Fatoyinbo, Temilola

关键词: BEAMFORMING;    SYNTHETIC APERTURE RADAR;    ANTENNA RADIATION PATTERNS;    IMAGE RESOLUTION;   

RP-ID  :  GSFC-E-DAA-TN58671-2

学科分类：工程和技术（综合）

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

An increasing challenge for P-band Synthetic Aperture Radar (SAR) is Radio Frequency Interference (RFI). RFI results in image distortions and degrades the derived science products. This makes it critical to apply RFI removal techniques to restore the image quality. New advanced techniques can be achieved with Digital Beamforming (DBF) radars such as EcoSAR. In this paper, we present a Range-Dependent Time Minimum Variance Distortionless Response (RDTMVDR) Beamformer and apply it to EcoSAR flight data during post-processing. The antenna pattern (AP) is adaptively changed for each range line which increases the RFI suppression compared to a fixed AP for each pulse. The interferometric image quality is assessed before and after RFI suppression.