Pseudorange Error Correction of Clear/Acquisition Code for civil users of CPS

Rajendra Laxman Desai, Philip S. Noe

Abstract:	The pseudorange error correction concept for a navigator using the Global Positioning System is developed and compared to position error correction. Software is also developed to produce two types of plots of the eighteen satellite Global Positioning System. The first plot shows the sub point of the satellite orbit on the face of the earth. Information on land masses and satellite identification is included on the plot. The second plot shows a three-dimensional representation of the earth and the actual satellite orbits around the earth. The earth may be viewed from any desired latitude and longitude. Landmasses, satellite identification, and timing information are included on the plot. For a given pseudolite ground station and user position the satellite generation, visibility, and selection routines are implemented to give the best Geometric Dilution of Precision. The satellite position coordinates are then disturbed and the new station and user positions are determined. The position error at the station and the range error to each satellite in view is then calculated and transmitted to the user. The user then determines his position coordinates using the range error correction terms sent by the ground station. A comparison is made with his position, after position error correction is implemented. Plots of the position error at the pseudolite ground station and the user are shown, along with the improvement in position measurement after position and range corrections are implemented at the user location.
Published in:	Proceedings of the 1984 National Technical Meeting of The Institute of Navigation January 17 - 19, 1984 San Diego, CA
Pages:	195 - 200
Cite this article:	Desai, Rajendra Laxman, Noe, Philip S., "Pseudorange Error Correction of Clear/Acquisition Code for civil users of CPS," Proceedings of the 1984 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1984, pp. 195-200.
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