A LOW COST GPS RECEIVER FOR LAND NAVIGATION

Kai P. Yiu, Richard Crawford and Ralph Eschenbach

Peer Reviewed

Abstract:	This paper describes an experimental single channel GPS sequential receiver based on Ll/C/A code for land navigation. The salient features of the receiver hardware designs and operations, as well as the navigation algorithms are summarized and reported. Some of the design problems which were encountered and the subsequent actions taken to resolve them are discussed. An HP 9825 desktop computer was used to perform the necessary navigation computations. In order to ensure good immunity to loss of lock in the presence of interference and under a dynamic environment, a Z-80 microprocessor was used to perform the receiver control functions and some digital signal processings. With the aid of an HP 9872 plotter, position fixes were marked on USGS 7.5 minute and 40 minute maps. Under static conditions, we were able to achieve 20 meters of accuracy in longitude and 8 meters of accuracy in latitude. Receiver test results in places like downtown San Francisco and the San Francisco International Airport are also reported in this paper. Based on our test results, we feel that we have proven the feasibility of land navigation with a low-cost GPS receiver. Finally, other possible civil applications of this receiver and the emerging new technologies for a low-cost GPS receiver will also be discussed.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 29, Number 3
Pages:	204 - 220
Cite this article:	Yiu, Kai P., Crawford, Richard, Eschenbach, Ralph, "A LOW COST GPS RECEIVER FOR LAND NAVIGATION", NAVIGATION: Journal of The Institute of Navigation, Vol. 29, No. 3, Fall 1982, pp. 204-220.
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