The Location Model of Platform In Insar/Ins Integrated Navigation System

SAR/INS navigation system utilizes SAR radar as an additional sensor to provide the platform trajectory position and compensate an aircraft drift due to Inertial Measurement Unit(IMU) errors. Images obtained by SAR radar are matched with a digital landmark Data. When no landmarks are available, this article presents a novel method of InSAR/INS integrated navigation system based on interferogram matching. Interferogram contains total terrain information and hardly affected by seasonal variations of features compared with SAR/INS system. Interferogram from actual InSAR real time processing and interferogram simulated by additional DEM are matched and platform position and attitude inversion model is constructed to compensate INS drift errors. Real-data experiments show that the approach can compensate INS drift errors well when GPS signal is lost.