Title :
Estimation of Aircraft Altitude Based on Squint Mode SAR Data
Author :
Tao Zeng ; Yinghe Li ; Zegang Ding ; Luosi Liu ; Fei Zou
Author_Institution :
Sch. of Inf. & Electron., Beijing Inst. of Technol., Beijing, China
Abstract :
The aircraft altitude relative to the illuminated region is a significant parameter for the geometric correction in squint mode synthetic aperture radar (SAR) imaging. Error in the parameter causes geometric distortion, which degrades the image quality. To circumvent this problem, a relative altitude estimator (RAE) is proposed based on the relationship between the relative aircraft altitude and the range variation of the Doppler centroid. The high performance of the RAE is investigated compared to the Cramér-Rao lower bound of the relative aircraft altitude. Finally, the effectiveness of the RAE in practical applications is verified by real data processing.
Keywords :
radar imaging; synthetic aperture radar; Cramer-Rao lower bound; Doppler centroid; geometric correction; geometric distortion; illuminated region; image quality; range variation; real data processing; relative aircraft altitude; relative altitude estimator; squint mode SAR data; squint mode synthetic aperture radar imaging; Accuracy; Aircraft; Atmospheric modeling; Azimuth; Doppler effect; Estimation; Synthetic aperture radar; Cramér–Rao lower bound (CRLB); Cram??r???Rao lower bound (CRLB); doppler centroid variation; geometric correction; relative altitude estimator (RAE); squint mode SAR; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2014.2329292
