ARCHITECTURE FOR FILTER ALGORITHM IN GPS/INS INTEGRATION

Document Type : Original Article

Authors

Egyptian Armed Forces.

Abstract

An inertial navigation system (INS) exhibits relatively low noise but tends to drift ov time. In contrast, Global Positioning System (GPS) errors are relatively noisy, b exhibit no long-term drift. Integrated INS/GPS navigation systems provide the best both worlds: the low short term noise characteristics of INS and the long term stabi of GPS are combined to provide a navigation solution with accuracy, reliability a robustness far beyond the sum of the constituent parts. However, in order to fu evaluate the performance of an integrated INS/GPS system, it is necessary stimulate both the GPS and inertial components of the system simultaneously. In the paper, the architectures for common filter algorithms in GPS/INS loose integrati are presented. The error dynamics for attitude calculation are derived. Algorithm based on quaternions and direction cosines are used. Simulation results a analyzed to evaluate the different systems. This system evaluation are required help to create specification data; to aid integration algorithm design and tuning; determine if the receiver meets a given specification; to create conditions beyo those which can be created during live trials; and to recreate a known anomaly which occurred in the real world.

Keywords