A L5 Receiver Test Bench

Lionel Ries, Joel Dantepal and Jean-Luc Issler

Abstract:	The GPS-IIF satellites will feature a new civil signal, called L5, dedicated to civil aviation as well as to any type of user. This signal is composed of an in-phase message and a quadrature pilot; both modulated by orthogonal 10.23 Mcps PN codes. The signal will be transmitted in the ITU’s reserved band for aeronautical navigation on the L5 frequency at 1176.45 MHz (also called E5a). In order to achieve a complete analysis of the L5 signal and to acquire an expertise on in-phase and quadrature RadioNavigation signals, the CNES (french space agency) has undertaken the development of a L5 transmitter- receiver bench. This bench comprises a transmitter (build around an FPGA and a parametric IQ signal generator), a RF-IF receiving stage followed by a datalogging sampler, and finally a software receiver. The transmitter’s fundamental frequency was set variable (instead of a fixed 10.23 MHz configuration): as a consequence, it is possible to modify the ratio between the signal bandwidth and the receiver’s IF bandwidth without changing the receiver’s hardware. Several receiver architectures are evaluated and their behavior analyzed under high dynamics, interference and jamming conditions. Finally, multi-path rejection will also be studied. For that purpose, experiments will be conducted in an outdoors environment. This paper presents a short analysis of the L5 signal, followed by a presentation of the bench. As the full software receiver is not yet completed, the publication of experimental results is delayed.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	683 - 689
Cite this article:	Ries, Lionel, Dantepal, Joel, Issler, Jean-Luc, "A L5 Receiver Test Bench," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 683-689.
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