Geo-correction Algorithm Based on Equivalent RD Model for ScanSAR of HJ-1-C Satellite

• Published in: Journal of radars = Lei da xue bao Vol. 3; no. 3; pp. 361 - 367
• Main Authors: 刘, 佳音, 温, 双燕, 张, 弘毅, 洪, 文
• Format: Journal Article
• Language: English
• Published: China Science Publishing & Media Ltd. (CSPM) 01.06.2014
• Subjects: Equivalent RD model; HJ-1-C satellite; SAR geo-correct; ScanSAR mode
• ISSN: 2095-283X; 2095-283X
• DOI: 10.3724/SP.J.1300.2013.13050

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.