Title :
Digital Beamforming for HRWS-SAR Imaging: System Design, Performance and Optimization Strategies
Author :
Gebert, Nicolas ; Krieger, Gerhard ; Moreira, Alberto
Author_Institution :
DLR (German Aerosp. Center), Microwaves & Radar Inst., Oberpfaffenhofen
fDate :
July 31 2006-Aug. 4 2006
Abstract :
Multi-aperture synthetic aperture radar (SAR) systems in combination with an appropriate coherent processing of the individual aperture signals enable high resolution wide swath (HRWS) SAR imaging [1]-[8]. An innovative reconstruction algorithm for such a digital beamforming on receive was presented in [9]-[12] that allows for HRWS even in case of a non-uniformly sampled data array in azimuth. This paper will compare this algorithm to different azimuth processing strategies regarding their performance in dependency of the overall sampling. Further, optimization strategies are discussed to maximize the system\´s performance by pattern tapering on transmit and "Pre-Beamshaping on Receive" networks that allow for pattern tapering on receive and adaptively adjust the virtual sample positions.
Keywords :
geophysical signal processing; geophysical techniques; image reconstruction; optimisation; performance evaluation; radar imaging; HRWS-SAR imaging; azimuth processing strategy; digital beamforming; high resolution wide swath SAR imaging; multi-aperture synthetic aperture radar systems; optimization strategy; pattern tapering; prebeamshaping on receive networks; reconstruction algorithm; virtual position; Array signal processing; Azimuth; Design optimization; High-resolution imaging; Image resolution; Radar polarimetry; Reconstruction algorithms; Signal processing; Signal resolution; Synthetic aperture radar;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2006. IGARSS 2006. IEEE International Conference on
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-9510-7
DOI :
10.1109/IGARSS.2006.474
