Inmarsat-3 Navigation Signal C/A Code Selection and Interference Analysis

J. R. Nagle, A. J. Van Dierendonck, Quyen Dan Hua

Abstract:	Inmarsat-3, the next generation of lnmarsat satellites, will carry a dedicated transponder package which will be capable of transmitting signals virtually identical to GPS at the Li frequency (1575.42 MHz). This paper provides a brief functional description of the Inmarsat-3 navigation transponder. This is followed by a discussion of the results of two studies performed to determine the compatibility between the proposed Inmarsat-3 navigation signal and the NAVSTAR Global Positioning System (GPS) navigation signals. The first study [l] resolved potential interference that may be caused by the Inmarsat-3 navigation signal to GPS receivers acquiring and tracking the GPS signals. The second study [2] examined the selection of C/A codes to be used by the Inmarsat-3 navigation payloads transmitting a GPS look-alike signal. The properties of these codes were then applied to the expected signal levels of the Inmarsat-3 satellites to assess the interference potential to GPS. The results show that the proposed Inmarsat3 signals will not adversly interfere with the GPS signals.
Published in:	Proceedings of the 1992 National Technical Meeting of The Institute of Navigation January 27 - 29, 1992 Catamaran Resort Hotel San Diego, CA
Pages:	159 - 168
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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