Research On In-flight Moving Base Alignment Of Airborne Strapdown Slave Inertial Navigation System

The alignment of moving base is widely concerned as a key technology of SSINS. Now, the alignment of moving base mainly includes transfer alignment with main inertial navigation system information and the alignment with GNSS information. In this paper, new matching schemes and new filter algorithms for above-mentioned alignments were mainly researched.The basic principle of transfer alignment was researched. The inadequate of speed matching transfer alignment based on kalman filter was analysed. New matching scheme and new filter algorithm for transfer alignment were studied and improved. Simulation results indicate that the application of H∞filter in transfer alignment could improve the rapidity greatly. It has great engineering application reference value.The specific-force-integration matching scheme was studied deeply. The difference of force integration between main navigation system and slave navigation one is set to be observed quantity, and platform errors of slave INS are estimated and compensated. Moreover, impaction of sensor precision to alignment performance was studied. The transfer alignment performance on the conditions of low-speed flight was tested. This scheme has a better engineering practicalbility in transfer alignment research.The GPS/INS integrated navigation system alignment was studied. The tracking performance of kalman filter for the mutation state is poor, so strong tracking filter based kalman and its application in GPS/INS was studied. Research and simulations results show that GPS/INS alignment used strong tracking filter based kalman has wide range of applications, rapidity and high-precision. The study of GPS/INS integrated navigation system alignment used H∞filter show that H∞filter loss the ability to track mutations during maneuver. This paper proposed a strong tracking filter based H∞.Simulation results indicate that strong tracking filter based H∞could improve the smoothness and accuracy greatly.At last, the alignment accuracy evaluation scheme based on the difference globle position system was studied. Kalman filter algorithm and Rauch-Tung-Striebel algorithm was studied and the evaluation scheme was simulated. The results verify the validity of the accuracy evaluation scheme. Keywords: Strapdown Inertial Navigation System, Alignment of Moving Base, H∞Filter, Specific Force, Strong Tracking Filter, Accuracy Evaluation...