Effect of SVN49 (PRN01) on Position and Time Accuracy for Single- and Dual-Frequency Users

M.B. El-Arini, R.S. Conker, D.G. O'Laughlin, C.J. Hegarty

Abstract:	On March 24, 2009, the GPS SVN49 was launched into slot B2. SVN49, a Block IIR-20(M) satellite, transmits PRN01 and carries a demonstration L5 payload in addition to the nominal L1 and L2 payloads. The purpose of transmitting the L5 signal is to satisfy the International Telecommunications Union (ITU) filing for the RF frequency 1176.45 MHz for GPS. The L5 signal started transmitting successfully on April 10, 2009. However, pseudorange biases were measured on the L1 and L2 signals at high elevation angles. It is believed that these biases are due to an impedance mismatch between L5 and L1 and L2 circuitry on the satellite. The Air Force has currently set SVN49 unhealthy, but would like to set it healthy at some future date. The GPS Wing has identified a number of techniques to mitigate the effect of this bias if the satellite is marked healthy in the future. The purpose of this paper is to examine the effects of the bias error on the accuracy of position and timing solutions of L1 single-frequency and L1/L2 dual-frequency receivers for the proposed mitigation techniques.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	915 - 923
Cite this article:	El-Arini, M.B., Conker, R.S., O'Laughlin, D.G., Hegarty, C.J., "Effect of SVN49 (PRN01) on Position and Time Accuracy for Single- and Dual-Frequency Users," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 915-923.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In