Enhancement of the Navigation Position Reference for INS Testing Using Differential GPS Pseudorange Measurements

Randall N. Paschall and William J. Negast

Abstract:	The U.S. Air Force has, for the last several years, compared the performance of navigation systems under development to the performance of a navigation system test standard known as the Completely Integrated Reference Instrumen- tation System (CIRIS). CIRIS achieves an ac- curate navigation solution by optimally combin- ing information, using an Extended Kalman fil- ter (EKF), from three major subsystems: iner- tial navigation system (INS) information, baro- metric altitude information, and range and range- rate information from precisely surveyed ground transponders. CIRIS currently uses a.n eleven error-state real-time EKF to evaluate INS per- formance on various airborne testbeds. The nav- igation solution produced by CIRIS will soon be inadequate as the standard a.gainst which fu- ture navigation systems can be tested. This pa- per proposes an enhancement to CIRIS referred to as the Enhanced Navigation Reference Sys- tem (ENRS) which takes advantage of newer ring laser gyro strapdown INS (LN-93) tech- nology, ground transponders from the current CIRIS, and differential Global Positioning System (DGPS) measurements. Analysis conducted us- ing the Kalman filter development package known as Multimode Simulation for Optimal Filter Eval- uation (MSOFE) is presented. A large order baseline trwth model for the ENRS is developed and full- and reduced-order Kalman filters are de- signed. Results suggest that the proposed ENRS with DGPS aiding can provide a navigation po- sition solution at least one order of magnitude better than the current CIRIS.
Published in:	Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992) June 29 - 1, 1992 ANA Westin Hotel Dayton, OH
Pages:	233 - 242
Cite this article:	Paschall, Randall N., Negast, William J., "Enhancement of the Navigation Position Reference for INS Testing Using Differential GPS Pseudorange Measurements," Proceedings of the 48th Annual Meeting of The Institute of Navigation (1992), Dayton, OH, June 1992, pp. 233-242.
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