Effect of GPS NAV and CNAV/CNAV-2 Message Truncation Error on SISRE

Y. Liu and L. Wang, D. Yang

Abstract:	This paper addresses the SISRE (Signal In Space Range Error) induced by the truncation of navigation message parameters. Based on the comparison of CED (Clock and Ephemeris Data) representations in the NAV and CNAV/CNAV-2 messages, the effects of ephemeris and SV clock data truncation on SISRE are simulated using the appropriate RINEX files downloaded from the IGS websites. The simulation results show that the SISRE of the NAV message is more sensitive to truncation errors than the CNAV/CNAV-2 message. The range of SISRE caused by CED truncation is reduced from 0.45m for NAV to 0.05m for CNAV/CNAV-2 at the cost of additional 63 bits occupied by a set of CED, among which the 10 bit increase of SV clock data representation makes a dominant contribution.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	751 - 760
Cite this article:	Liu, Y., Wang, L., Yang, D., "Effect of GPS NAV and CNAV/CNAV-2 Message Truncation Error on SISRE," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 751-760.
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