GPS L5 Cross-correlation Detection in WAAS G-III Reference Receiver

Surendran Shanmugam, Allan Manz, and Owen Thistle

Abstract:	Unlike GPS modernized L2C signal, the modernized GPS L5 signal is mainly intended to serve safety critical applications such as aviation. Compared to GPS L1 C/A signal, the GPS L5 signal will be radiated at least four times the current GPS L1 C/A signal power. As with modernized GPS signals, the GPS L5 signal comprises pilot component to facilitate weak signal acquisition and tracking. Unlike the GPS L2 CL and L1C signal, the GPS L5 signal exhibits modest improvement in terms of correlation protection over the legacy GPS L1 C/A code. Moreover, the same secondary synchronization codes are shared across all the GPS L5 satellite signals. Thus, the tracking range of GPS L5 signal easily exceeds the correlation protection offered by the primary spreading code. Cross-correlation if present can introduce errors in range and signal quality measurements. Safety-critical systems such as the SBAS and GBAS are particularly sensitive to range errors introduced by cross-correlation. Hence, it is critical to monitor and eliminate anomalous tracking due to cross-correlation. This paper introduces anomalous tracking detection algorithms that are specifically developed for the WAAS G-III reference receiver. The developed algorithms can detect anomalous events that may arise from tracking auto-correlation side-peak and cross-correlation peaks. Monte Carlo simulations as well as hardware based experimental measurements are provided to validate the usefulness of the developed algorithms.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	1369 - 1378
Cite this article:	Shanmugam, Surendran, Manz, Allan, Thistle, Owen, "GPS L5 Cross-correlation Detection in WAAS G-III Reference Receiver," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 1369-1378.
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