Initial Results on Nominal GPS L5 Signal Quality

C.J. Hegarty, J.T. Ross

Abstract:	Rise-/fall-time asymmetries of up to 5 ns in the generation of the baseband coarse/acquisition (C/A) code signal and a “ringing” upon transitions in the pseudorandom noise (PRN) sequence has been observed in the C/A code signals broadcast by the operational GPS satellites. These phenomena have been dubbed “digital distortion” and “analog distortion”, respectively, in previous literature. Such distortions can result in position errors and for this reason the level of these distortions is monitored in differential GPS networks used for aviation applications. For the GPS L5 signal to be integrated into these networks in the future, it is necessary to characterize nominal levels of digital and analog distortion for this new signal as broadcast by the Block IIF satellites and beyond. This paper estimates levels of digital and analog distortion for the 1st Block IIF satellite based upon both factory and live signal measurements.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	935 - 942
Cite this article:	Hegarty, C.J., Ross, J.T., "Initial Results on Nominal GPS L5 Signal Quality," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 935-942.
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