WAAS Receiver Carrier Tracking Loop and Data Demodulation Performance in the Presence of Wideband Interference

Bernard A. Schnaufer and Gary A. McGraw

Abstract:	The Minimum Operating Performance Standards for the Wide Area Augmentation System (WAAS MOPS) for enroute through non-precision approach phases of flight has been completed by RTCA SC-159. This MOPS specifies an interference mask and minimum signal conditions which will be valid for all phases of flight. In addition, requirements for demodulated WAAS word error are specified. The word error requirements are derived from integrity requirements for WAAS precision approach. In support of the SC-159 WAAS MOPS activities, a detailed phase-locked loop carrier tracking simulation and analysis for the WAAS satellite signals was performed using the current link budget assumptions. The high fidelity, nonlinear carrier tracking loop simulations include the Viterbi decoder and provide word error, bit error, and cycle slip rates as a function of carrier to noise-plus-interference ratio. The results of the study are then compared with existing theoretical performance curves in order to emphasize the reasonableness of the simulation results as well as the limitations of previous theoretical analysis. Based on the simulation data, it appears that there is approximately a 1 dB link budget gap which must be addressed by the appropriate industry/government committees.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	771 - 780
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
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