25 January 2018 Wide-scene airborne ladar imaging exploiting the synthetic aperture technique with terrain observation by progressive scans
Author Affiliations +
Abstract
The image scene is limited by the small size of the spot, which is linked with the short wavelength of the laser in synthetic aperture ladar (SAL). The common wide-scene imaging mode in synthetic aperture radar, i.e., the terrain observation by progressive scans imaging mode, is extended and applied in SAL. A suitable imaging algorithm is also proposed according to the characteristics of the signal. First, the azimuth prefiltering based on the spectrum analysis is adopted to eliminate the azimuth spectrum aliasing caused by the steering of the antenna beam. Then, the improved frequency scaling algorithm is applied to complete the range compression and range cell migration correction. Meanwhile, the Doppler frequency shift induced by the continuous moving of the platform is compensated. Finally, the azimuth compression is completed in the Doppler domain, and the SAL image without ambiguity is obtained with the application of the dechirp technique. Simulation results provide the evidence on the effectiveness of the proposed method.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Liang Guo, Liang Guo, Dongjie Wang, Dongjie Wang, Xiaozhen Li, Xiaozhen Li, Hongfei Yin, Hongfei Yin, Guangcai Sun, Guangcai Sun, Xiaodong Zeng, Xiaodong Zeng, Yu Tang, Yu Tang, Mengdao Xing, Mengdao Xing, } "Wide-scene airborne ladar imaging exploiting the synthetic aperture technique with terrain observation by progressive scans," Optical Engineering 57(1), 016110 (25 January 2018). https://doi.org/10.1117/1.OE.57.1.016110 . Submission: Received: 3 November 2017; Accepted: 28 December 2017
Received: 3 November 2017; Accepted: 28 December 2017; Published: 25 January 2018
JOURNAL ARTICLE
8 PAGES


SHARE
Back to Top