Geo-correction Algorithm Based on Equivalent RD Model for ScanSAR of HJ-1-C Satellite
Liu Jia-yin,
Wen Shuang-yan,
Zhang Hong-yi,
Hong Wen
Affiliations
Liu Jia-yin
①(Key Laboratory of Technology on Geo-spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing 100190, China)③(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ④(University of Chinese Academy of Sciences, Beijing 100049, China)
Wen Shuang-yan
①(Key Laboratory of Technology on Geo-spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing 100190, China)③(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
Zhang Hong-yi
①(Key Laboratory of Technology on Geo-spatial Information Processing and Application System, Chinese Academy of Sciences, Beijing 100190, China)③(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ④(University of Chinese Academy of Sciences, Beijing 100049, China)
Hong Wen
②(National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China) ③(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
HJ-1-C satellite is the first Synthetic Aperture Radar (SAR) satellite for civilian use in China, and it has a strip and scan mode. According to the characteristics of the ScanSAR of the HJ-1-C satellite, a geo-correction algorithm based on an equivalent RD model has been outlined in this paper on the basis of an ECS image processing algorithm and a traditional Range-Doppler location method. An azimuth mosaic was presented by a time series relationship, then the different burst was stitched by range, and the equivalent parameters were fitted to locations on the RD model. Finally, the ScanSAR image was geo-corrected. The HJ-1-C satellite data results showed that the location accuracy of ScanSAR for the HJ-1-C satellite was less than 100 m, and the geo-correction algorithm was realized in 10 s in fewer than 24 parallel cores.
