Comparison of Nonlinear Filtering Techniques for Inertial Sensors Error Identification in INS/GPS Integration

Document Type : Research Note

Authors

Department of Mechanical Engineering, Sharif University of Technology PO. Box 11365-9567, Iran

Abstract

Nonlinear filtering techniques are used to fuse the global positioning system (GPS) and the inertial navigation system (INS) together to provide a robust and reliable navigation system with a performance superior to that of either INS and GPS alone. Prominent nonlinear estimators in this field are the Kalman Filters (KF) and Particle Filters (PF). The main objective of this research is the comparative study of the well-established filtering methods of EKF, UKF and the PF based on EKF and UKF in INS-GPS integrated navigation system. Different features of INS-GPS integrated navigation methods in the state estimation, bias estimation and bias/scale factor estimation are investigated by using these four filtering algorithms. Both ground-vehicle experimental test and flight simulation test have been utilized to evaluate the filters performance

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