An Assessment of GPS Receiver Performance in the Presence of A-S

Mark P. Leach, Mike A. Cardoza and Keith A. Duff

Abstract:	An experiment was conducted to assess the viability and performance of techniques which allow GPS receivers to produce a range measurement on the L2 frequency without direct Y-code correlation. Data were collected from two GPS receiver models employing different implementations of what is referred to in this paper as “Y-codeless” tracking. The experiment was conducted during a period in which Anti-Spoofing (A-S) was on during June, 1992. For comparison purposes, P-code reference data from several conventional (code-correlating) geodetic quality GPS receivers, as well as some data from a Y-code correlating receiver, were also collected during the same period. This paper briefly describes the respective Y- codeless techniques, summarizes the experiment, and presents an assessment of Y-codeless data characteristics in comparison with P-code data characteristics from the various receivers involved in the experiment. The emphasis is on receiver measurement noise as a function of elevation angle. Multipath effects are seen to dominate the noise characteristics and therefore an assessment of multipath effects on Y-codeless and P-code measurement data and a comparison of various multipath mitigation strategies is included. The Y- codeless techniques are seen to be viable and performance compares well with claims by the developers.
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:	613 - 622
Cite this article:	Leach, Mark P., Cardoza, Mike A., Duff, Keith A., "An Assessment of GPS Receiver Performance in the Presence of A-S," Proceedings of the 1993 National Technical Meeting of The Institute of Navigation, San Francisco, CA, January 1993, pp. 613-622.
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