Ghost Busting: The Return from the Dead of PRN 8 Causes Pseudo-Range Transients

Kenneth L. Gold

Abstract:	An experiment was initiated in February of 1990 to determine the point positioning repeatability of the ISTAC 2002 codeless GPS receiver, and to investigate the precision of the GPS Control Segment navigation message uploads and the effects of Selective Availability @A) on the Block II satellites. Data was acquired daily in three hour intervals for a four month period. The C/A code range residuals, for PRN 6 alone, showed an anomaly for a 310 set period each day. This event also occurred in the P-code solution. At first, the anomaly seemed to be the result of multipath contamination, especially because of its occurrence 4 min earlier each day. Upon further investigation it was determined that the anomaly was the result of the reactivation of the Block I satellite PRN 8 after it had been supposedly turned off permanently. The process by which this conclusion was reached is described in detail. Also, an analysis of the data acquisition method of the ISTAC 2002 receiver is given.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	569 - 575
Cite this article:	Gold, Kenneth L., "Ghost Busting: The Return from the Dead of PRN 8 Causes Pseudo-Range Transients," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 569-575.
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