The Analysis of a Design for Measuring Ionospheric Delays in a GPS C/A-code Receiver

Steven N. Karels, Mats E. Viggh

Abstract:	Traditional approaches to Global Positioning System (GPS) receivers require the use of Precise (P)-code track- ing channels at Ll and L2 frequencies to measure iono- spheric delays. A concept is proposed to permit an unau- thorized, Clear/Acquisition (C/A)-code GPS receiver to perform dual frequency ionospheric delay measurements without any knowledge of the P- (or Y-) code. This concept supports ionospheric error measurement and removal in commercial GPS C/A-code receivers. The concept is presented in detail and performance analy- ses are described. The significance of this concept is the ability to achieve direct ionospheric measurements by an unauthorized, C/A-code GPS receiver even when Anti- Spoofing (A-S) conditions are in effect.
Published in:	Proceedings of the 1993 National Technical Meeting of The Institute of Navigation January 20 - 22, 1993 Parc 55 Hotel San Francisco, CA
Pages:	623 - 628
Cite this article:	Karels, Steven N., Viggh, Mats E., "The Analysis of a Design for Measuring Ionospheric Delays in a GPS C/A-code Receiver," Proceedings of the 1993 National Technical Meeting of The Institute of Navigation, San Francisco, CA, January 1993, pp. 623-628.
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