Azimuth resolution improvement for spaceborne SAR images with quasi-non-overlapped Doppler bandwidth

作者：Liu, Yanyang^*; Li, Zhenfang; Suo, Zhiyong; Li, Jinwei; Bao, Zheng

来源：Journal of Systems Engineering and Electronics, 2014, 25(3): 422-427.

DOI：10.1109/JSEE.2014.00048

• synthetic aperture radar (SAR)
• azimuth resolution improvement
• maximum sharpness optimization
• fringe simulation

The azimuth resolution improvement problem is solved via a coherent combination of synthetic aperture radar (SAR) images with the quasi-non-overlapped Doppler bandwidth. Prior to the spectra combination, SAR images should be co-registered, while phase biases induced by topography, atmospheric propagation delays and baseline measurement errors should be calibrated. However, the coregistration accuracy suffers from large Doppler decorrelation caused by the quasi-non-overlapped Doppler bandwidth. Furthermore, the method used to estimate phase biases from interferogram of azimuth pre-filtered SAR image pairs will fail when there is no overlapped spectrum. The fringe simulation and maximum sharpness optimization are adopted to deal with the problems. Accordingly, a novel algorithm to coherently synthesize SAR images is presented. The experiment with the Terra SAR X-band (TerraSAR-X) satellite data validates the performance of the presented method.

• 出版日期2014-6
• 单位西安电子科技大学