An Accurate Motion Compensation for SAR Imagery based on INS/GPS with Dual-filter Correction. (23rd November 2019)

• Record Type: Journal Article
• Authors: Chen, Linzhouting; Liu, Zhanchao; Fang, Jiancheng
• Is Part Of: Journal of navigation. Volume 72:Number 6(2019)
• Page Start: 1399
• Page End: 1416
• Publication Date: 2019-11-23
• Subjects: INS/GPS, -- Motion Compensation, -- Dual-filter Correction, -- Synthetic Aperture Radar, -- Long Imaging Period; Navigation -- Periodicals; 623.8905
• DOI: 10.1017/S0373463319000365
• Languages: English
• ISSNs: 0373-4633

Abstract

Abstract : Current Motion Compensation (MOCO) methods using Inertial Navigation System (INS)/Global Positioning System (GPS) integrated systems have provided an important advance in Synthetic Aperture Radar (SAR) imagery, but most of these methods only work well over a short imaging period. With the development of high-resolution SAR that provides image gathering over long periods, the need for higher levels of INS/GPS performance than normally available is desired. The higher requirement of INS/GPS for SAR MOCO is two-fold: (1) the accurate knowledge of location information, and (2) the smoothness of relative change in navigation error. In this paper, we design an INS/GPS architecture with dual-filter correction to obtain accurate absolute velocity and position measurement information with smooth low relative error noise over a long image gathering period. Real SAR data experimental results show that the proposed method effectively improves the MOCO performance of INS/GPS with long SAR imaging periods, in which the SAR azimuth resolution reaches 1·45 m, which is very close to the design value of 1 m.