Title :
Unknown target motion compensation for spotlight-mode synthetic aperture radar imagery
Author :
Song, Yi ; Blostein, Steven D.
Author_Institution :
Dept. of Electr. Eng., Queen´´s Univ., Kingston, Ont., Canada
Abstract :
In spotlight-mode synthetic aperture radar (SAR), a long integration time is required to achieve a high cross-range resolution. Unfortunately, target motion during this long integration time will lead to undesirable smeared SAR images. The effect of subaperture integration time (SIT) on motion compensation for spotlight-mode SAR is investigated. Subaperture images are used to estimate the target velocity via object´s centroid measurements. The estimated velocity is used to achieve motion compensation. The target is assumed to have a constant translational motion. The results demonstrate how the accuracy of motion compensation depends on the SIT and target velocity. With the analysis in this paper, we can optimize the choice of the SIT
Keywords :
Kalman filters; filtering theory; motion compensation; motion estimation; radar imaging; synthetic aperture radar; Kalman filtering; SAR images; centroid measurements; constant translational motion; high cross-range resolution; long integration time; motion compensation accuracy; spotlight-mode SAR imagery; spotlight-mode synthetic aperture radar imagery; subaperture images; subaperture integration time; synthetic aperture radar; target motion; target motion compensation; target velocity; target velocity estimation; Chirp; Filtering; Gold; High-resolution imaging; Image resolution; Motion compensation; Motion estimation; Radar imaging; Synthetic aperture radar; Velocity measurement;
Conference_Titel :
Image Processing, 2000. Proceedings. 2000 International Conference on
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-6297-7
DOI :
10.1109/ICIP.2000.901052
