Interference Study - Processing Semi-Live Galileo L1 and Live GPS L1 Data in a High-Performance GNSS Software Receiver

P-L. Normark, C. Ståhlberg, G. Seco-Granados

Abstract:	The objective of this paper is to study the interference impact on the GPS L1 signals introduced by the Galileo L1 signals. There have been a number of analytic studies of the influence of both signals in the same band [1,2,3]. This work extends past efforts by recording live GPS L1 intermediate frequency (IF) data from a real antenna/front-end and injecting software simulated Galileo L1 IF signals and analyzing the data using an advanced software radio receiver. A survey grade L1 antenna and a high-bandwidth GPS L1 Radio Frequency downconverter is used together with a multi-bit analog-to-digital (A/D) converter and data recording hardware/software to store the raw downconverted GPS L1 Intermediate Frequency (IF) samples onto a non-volatile storage (hard drive). Since no Galileo Signal-in-Space source is yet available, and the specifications [at this date] of the Galileo signal structure are still under development, a flexible software signal generator for the Galileo L1 signals has been developed. The simulator emulates the critical components of the Radio Frequency (RF) chain from antenna to A/D converter with a user specified dynamic profile for multiple satellites. It has been designed to allow for injection of software simulated signals into real world samples. The basis behind the analysis is to use a software receiver as tool and compare statistical measurements results of the combined IF data. Particularly any signal degradation of the GPS L1 signal due to Galileo signals is explored.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	1965 - 1972
Cite this article:	Normark, P-L., Ståhlberg, C., Seco-Granados, G., "Interference Study - Processing Semi-Live Galileo L1 and Live GPS L1 Data in a High-Performance GNSS Software Receiver," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 1965-1972.
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