Title :
Model-based Doppler estimation for frame-based SAR processing
Author_Institution :
Dept. of Electr. & Comput. Eng., British Columbia Univ., Vancouver, BC, Canada
Abstract :
Presents a new method of Doppler centroid estimation whereby estimates are made over small blocks of data covering a whole frame of data, and examined for strong SNR and lack of bias. Poor estimates are rejected, and the remaining estimates are used to fit a surface model of the Doppler centroid versus range and azimuth. The method is applied to both the fractional and integer PRF part of the centroid. A geometric model is used to constrain the model to allowable roll, pitch and yaw values of satellite attitude. The method is tested with RADARSAT-1 and SRTM/X-SAR data
Keywords :
Doppler radar; radar signal processing; synthetic aperture radar; Doppler centroid estimation; RADARSAT-1 data; SRTM/X-SAR data; azimuth; data handling; frame-based SAR processing; geometric model; model-based Doppler estimation; range; satellite attitude; surface model; Azimuth; Satellites; Solid modeling; Surface fitting; Testing;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2001. IGARSS '01. IEEE 2001 International
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-7031-7
DOI :
10.1109/IGARSS.2001.978117
