Title :
SAR image processing for moving target focusing
Author_Institution :
Lincoln Lab., MIT, Lexington, MA, USA
Abstract :
A novel synthetic aperture radar (SAR) image processing technique has been developed to refocus the ground moving target signature from its smeared response in the SAR image of the stationary ground. The technique implements a matched moving target filter that is derived from the signal history along the target range-Doppler migration path mapped onto the SAR image from its real-space trajectory. The spatial filter is specified by both the apparent target range in the image and the magnitude of the relative target-to-radar velocity. Range dependence may also be eliminated in image filtering by performing the inverse Fourier transform of the SAR image data spectrum after a spatial frequency coordinate transformation
Keywords :
Doppler radar; Fourier transforms; airborne radar; filtering theory; matched filters; military radar; radar detection; radar imaging; radar target recognition; radar theory; radar tracking; spatial filters; spectral analysis; synthetic aperture radar; SAR image processing; apparent target range; data spectrum; ground moving target signature; image filtering; inverse Fourier transform; matched moving target filter; moving target focusing; range dependence; real-space trajectory; relative target-to-radar velocity; signal history; smeared response; spatial filter; spatial frequency coordinate transformation; synthetic aperture radar; target range-Doppler migration path; Filtering; Focusing; Fourier transforms; Frequency; History; Image processing; Matched filters; Spatial filters; Synthetic aperture radar; Trajectory;
Conference_Titel :
Radar Conference, 2001. Proceedings of the 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-6707-3
DOI :
10.1109/NRC.2001.922952
