Hybrid GPS/Galileo Real Time Software Receiver

Per-Ludvig Normark and Christian Ståhlberg

Abstract:	Galileo is designed to be interoperable but independent from GPS. Interoperability means that user receiver equipment should be able to take advantage of both systems to increase accuracy, integrity, and overall performance. Compatibility, on the other hand, implies that the two systems should operate concurrently but independently, with as little impact on each other as possible. The inclusion of Galileo should not degrade GPS standalone performance, and conversely GPS should not impact Galileo processing. The interoperability, despite frequency overlap, is accomplished through the use of different signal structures and codes. The frequency overlap, or essentially using the same carrier frequency, greatly simplifies the radio frequency (RF) design and reduces the cost for hybrid receivers; the same antenna and front end can be used to receive signals from both systems. The digital signal processing of the signals will, however, differ. This paper presents the design and implementation of a hybrid software GPS/Galileo receiver, together with testing and performance results using a GPS/Galileo software intermediate frequency (IF) simulator.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	1906 - 1913
Cite this article:	Normark, Per-Ludvig, Ståhlberg, Christian, "Hybrid GPS/Galileo Real Time Software Receiver," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 1906-1913.
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