Indoor Galileo Receivers - Sensitivity, Pilot Signals, Secondary Codes

Philip G. Mattos

Abstract:	The first mass-market Galileo receivers must meet both the cost and performance levels of GPS receivers then available. The paper outlines the sensitivity and TTFF capabilities of the indoor GPS receiver, and discusses the areas where Galileo has scope to improve on this, and where it imposes difficulties of extra processing, and how these difficulties can be overcome, particularly in extracting the benefits of the secondary code on the pilot signal. The aim is to achieve indoor levels of sensitivity with the low-cost consumer Galileo E1/L1-only receiver, recognizing that the signal was designed as a compromise between many requirements, most of which conflict with the fast TTFF, high-sensitivity, low-cost needs of the consumer market. The paper shows the test results of the new silicon and software, in terms of sensitivity and time to first fix, outside and indoors at various signal strengths, for cold starts, hot-starts, tracking and reacquisition. The laboratory tests must be performed first with the simulator, where the signal has known and controlled characteristics, then with a roof antenna, to represent the real world, then with the roof antenna attenuated to simulate bad antenna environments, and finally with a half-sky attenuated scenario, to represent the highly obstructed urban canyon. Automatic test suites run continuous repeated start-ups for at least 24 hours, to ensure that all possible satellite positions are covered, all the time measuring TTFF and accuracy, and logging all diagnostic data so that the engineering team can analyse any anomalies later.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1042 - 1048
Cite this article:	Mattos, Philip G., "Indoor Galileo Receivers - Sensitivity, Pilot Signals, Secondary Codes," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1042-1048.
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