Effects And Mitigation Of Land Based Interferers On Fixed Site GPS Installations - A Manufacturers Experience

T. Haddrell, H. Khawaja

Abstract:	GPS is becoming more and more integrated into communications infrastructures, leading to a large number of non-mobile installations which are used primarily as sources of time and/or frequency. With this trend comes a wave of interference problems, whose source is also land-fixed. Thus the usual “mobile” options of avoiding interference by seeking alternative locations, or at least making it temporary, are not available to the infrastructure planner. Navstar has world wide experience in timing infrastructure installations, and has encountered a number of “popular” interference sources. The paper describes these, and then presents the techniques and possibilities at a manufacturer’s disposal to help customers create successful installations at the greatest possible number of sites. These must begin at the design stage, and encompass the whole receiver in terms of antenna, RF and digital processing stages, and continue on through packaging and siting. Two case studies are chosen to highlight the environment with which we have to cope - one European, one North American. The paper presents results of investigations and the strategies adopted for remedy. Finally, we address the future in terms of a likely increase in the effects of the electromagnetic jungle. More signals-in-space combine with increased consumer wireless communication services on the ground to increase the pressure on our jamming margins. What then lies in store for designers, manufacturers and users ? We examine whether the GPS system can cope, or if we need to “clean up” the spectrum in order to provide a continuing service.
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:	851 - 861
Cite this article:	Haddrell, T., Khawaja, H., "Effects And Mitigation Of Land Based Interferers On Fixed Site GPS Installations - A Manufacturers Experience," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 851-861.
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