Interference of GPS signals: Influence of Licensed Transmitters on the GPS Signal Quality in the Netherlands' Airspace

F. Klinker and O.B.M. Pietersen

Abstract:	Interference to civil aviation GPS receivers in the Netherlands airspace was analysed. Two types of GPS receivers were considered: one for installation in commercial aircraft and one hand-held receiver commonly used in the general aviation practice. The offending transmitters were selected for having their frequency or harmonics in or near the GPS L1 frequency band. The results of the analysis show that potential interference near FM and TV broadcast transmitters may exist if the official limits for spurious emissions are used. The same situation applies to airports where some VHF radio navigation and communication systems can be identified as potential interfering sources. However, in practice there is little evidence of interference in these situations. It was postulated therefore that in practice the level of the harmonics in the emitted fields is (much) lower than required according to ITU regulations, which could be caused by extra suppression of harmonics by the transmitter antennas. Measurements have shown that this postulation indeed is correct.
Published in:	Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000) June 26 - 28, 2000 The Catamaran Resort Hotel San Diego, CA
Pages:	260 - 268
Cite this article:	Klinker, F., Pietersen, O.B.M., "Interference of GPS signals: Influence of Licensed Transmitters on the GPS Signal Quality in the Netherlands' Airspace," Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000), San Diego, CA, June 2000, pp. 260-268.
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