Implications of C/A-on-CA Interference on Carrier Tracking Loop Performance

Robert Golshan, Tiange Fan, Alberto Arredondo, Tom  Stansell

Abstract:	This paper addresses the impact of C/A-on-C/A interference on carrier tracking loop of a GPS receiver. A post-correlator model is derived by analyzing the signal, interference and noise components at the output of the prompt correlator. Using computer simulations, C/A-on-C/A interference is further characterized at the correlator output, and its impact on carrier tracking phase error is examined. To date, there are different perspectives on how C/A-on-C/A interference should be viewed. One viewpoint models the interference waveform as a non-white random process whose impact on receiver performance can be assessed through evaluations of the signal-to-noise ratio (SNR) at the output of the correlator [12]. This approach introduces the concept of effective noise which refers to the additional amount of white noise that has to be introduced at the receiver’s input in order to yield the same effective SNR at the output of the correlator. It is then implied that this effective noise has the same impact on receiver performance as does the (non-white) C/A-on-C/A interference. Another viewpoint argues that the effects of C/A-on-C/A interference should not be modeled as noise enhancement but rather as signal distortion, much like in a multi-path scenario [15]. The objective of this paper is to examine the C/A-on-C/A interference problem in order to solidify conclusions regarding its impact on carrier tracking.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	3510 - 3525
Cite this article:	Golshan, Robert, Fan, Tiange, Arredondo, Alberto,  Stansell, Tom, "Implications of C/A-on-CA Interference on Carrier Tracking Loop Performance," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3510-3525.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In