Measurement Error and Protection Envelopes in the Presence of Interference for GNSS Receivers

José M. López-Almansa and Pedro A. Pablos

Abstract:	RF interference is a matter of deep concern in precision navigation. One of its most disturbing effects is to increase the code measurement-error of the receiver. In a previous paper we derived a theoretical model (experimentally validated) to estimate the measurement error in a coherent Delay Lock Loop induced by a RF interference, as a function of its arbitrary spectrum profile and the receiver parameters. Based on this model, the present paper makes a sensitivity study in order to find out the influence of the bandwidth and spectrum location of the interference, as well as the receiver parameters, on the measurement error. Then, the worst cases are considered as a basis to define protection envelops, i.e. interference power levels which should not be exceeded in order to guarantee a certain receiver performance in terms of code measurement error (according to the assumed GNSS requirements).
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:	797 - 807
Cite this article:	López-Almansa, José M., Pablos, Pedro A., "Measurement Error and Protection Envelopes in the Presence of Interference for GNSS Receivers," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 797-807.
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