Analyzing the Impact of Integrating Pseudolite Observables into a GPS'INS System

This paper deals with the issue of incorporating pseudolite measurements into an integrated Global Positioning System/ Inertial Navigation System ~GPS/INS! positioning and attitude system with a view to improving signal availability, solution reliability, and accuracy in a localized area. Existing GPS/INS systems can overcome inherent shortcomings of each of the navigation technologies ~line-of-sight signal requirement for GPS and INS errors that grow with time!; therefore, such systems are now used for a wide variety of land, sea, and airborne applications where accurate positioning and/or attitude information is required with high output rate. However, their performance can still be degraded under certain conditions, such as when the duration of satellite signal blockage exceeds a certain time period ~related to the quality of the INS!, resulting in large accumulated INS errors. Such a scenario is a common occurrence for many kinematic applications. In an integrated GPS/Pseudolite/INS scheme, in order to gain the maximum benefit from additional pseudolite measurements, it is necessary to investigate how pseudolites can best be deployed to complement an existing GPS/INS system. A series of simulations, as well as field experiments with a GPS/Pseudolite/INS system comprising a NovAtel Millennium GPS receiver, an IntegriNautics IN200 pseudolite, and a MIGITS strapdown INS, were carried out, and the impact on performance of integrating pseudolite~s! has been assessed for a variety of operational conditions and different system configurations. The results indicate that the overall performance of the system can indeed be significantly improved using additional pseudolite measurements.

[1]  Bernd Eissfeller,et al.  Practical Investigations on DGPS For Aircraft Precision Approaches Augmented by Pseudolite Carrier Phase Tracking , 1997 .

[2]  Dorota A. Grejner-Brzezinska,et al.  EXPERIMENTAL GPS/INS/PSEUDOLITE SYSTEM FOR KINEMATIC POSITIONING , 2003 .

[3]  Joel Barnes,et al.  Analysis of Pseudolite Augmentation for GPS Airborne Applications , 2002 .

[4]  Toshiaki Tsujii,et al.  Pseudolite applications in positioning and navigation: Modelling and geometric analysis , 2001 .

[5]  Christian Altmayer Pseudolites – A Means to Enhance the Applicability of GNSS to Municipal Areas , 1999 .

[6]  D. A. Grejner-Brzezinska,et al.  GPS error modeling and OTF ambiguity resolution for high-accuracy GPS/INS integrated system , 1998 .

[7]  Jinling Wang,et al.  Pseudolite Applications in Positioning and Navigation: Progress and Problems , 2002 .

[8]  Pat Fenton,et al.  HAPPI - a High Accuracy Pseudolite/GPS Positioning Integration , 1996 .

[9]  Edward A. LeMaster,et al.  Mars Exploration Using Self-Calibrating Pseudolite Arrays , 1998 .

[10]  Charles K. Toth,et al.  GPS/INS/Pseudolite Integration: Concepts, Simulation and Testing , 2001 .

[11]  Chris Rizos,et al.  Kinematic Positioning with an Integrated GPS / Pseudolite / INS , 2001 .

[12]  Caleb S. Stone,et al.  Progress and Problems , 1961 .

[13]  A. Leick GPS satellite surveying , 1990 .

[14]  Bernd Eissfeller,et al.  Track Irregularity Measurement using an INS - GPS , 1999 .

[15]  Jinling Wang,et al.  Impact of Pseudolite Location Errors in Positioning , 2002 .

[16]  Bradford W. Parkinson,et al.  Development of Indoor Navigation System using Asynchronous Pseudolites , 2000 .

[17]  Hung Kyu Lee,et al.  GPS/Pseudolite/SDINS Integration Approach for Kinematic Applications , 2002 .

[18]  D. A. Quarles,et al.  Progress and problems , 1953, Electrical Engineering.

[19]  B. Eissfeller,et al.  Track Irregularity Measurement Using An INS-GPS Integration Technique , 2000 .

[20]  Gérard Lachapelle,et al.  GPS Augmentation with Pseudolites for Navigation in Constricted Waterways , 1997 .

[21]  Chris Rizos,et al.  Pseudo-Satellite Applications in Deformation Monitoring , 2002, GPS Solutions.