Cochannel Interference Analysis, a Valuable Tool for GPS Sharing Studies

Srini H. Raghavan, Steve Lazar, Raj Kumar, and Michael Zeitzew

Abstract:	Discussions are ongoing in national and international fora to determine if new service ‘sharing’ the GPS bands will cause unacceptable interference. Studies have been conducted in the past attempting to show the effect of interference on GPS operation using a number of different approaches. Until recently, most studies have not included a key factor, namely cochannel interference. Cochannel interference for GPS arises from the fact that the C/A-code, being a short code, has average cross-correlation properties that far exceed the value for truly random codes. This results in reduced multiple-access capacity for GPS. The effect of cochannel interference is most apparent in the acquisition of low-elevation satellites. This paper presents a tool for accurately accounting for cochannel interference, which, along with a GPS constellation model, provides critical analysis for determining the possibility of sharing the GPS spectrum with other systems.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	819 - 825
Cite this article:	Raghavan, Srini H., Lazar, Steve, Kumar, Raj, Zeitzew, Michael, "Cochannel Interference Analysis, a Valuable Tool for GPS Sharing Studies," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 819-825.
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