Receiver Compatibility of POCET Signal Combining

P. A. Dafesh, R. Bow, T. Fan, J. Hsu

Abstract:	A new Phase Optimized Constant Envelope Transmission (POCET) method has been developed for application to combining of GPS and other GNSS signals. In a prior paper presented at ION GNSS 2009, the approach was shown to be superior to previously developed signal combining approaches including Majority Vote, Intervote, and similar combining methods planned for use in modernized GNSS systems. In this paper, we compare backward compatibility of the POCET modulation method to other signal combining approaches using an FPGA-based Aerospace Reprogrammable Modulation simulator (ARMS). The output of the ARMS is capable of simulating GPS signals in real time for multiple satellite vehicles (SVs) utilizing a variety of combining methods. This simulator was used to demonstrate the first receiver navigation using a C/A code signal in a POCET-modulated composite signal. Navigation and C/No measurements were obtained for both a commercial C/A code receiver and a software defined radio (SDR)-based Modernized Aerospace GNSS Navigation Evaluation Testbed (MAGNET) receiver. These results are shown to be consistent with spectral separation calculations used to demonstrate the backward compatibility of the POCET method relative to linearly signal combining. The work describes the ARMS implementation, experimental setup and theoretical analysis as compared to measured results.
Published in:	Proceedings of the 2011 International Technical Meeting of The Institute of Navigation January 24 - 26, 2011 Catamaran Resort Hotel San Diego, CA
Pages:	1173 - 1180
Cite this article:	Dafesh, P. A., Bow, R., Fan, T., Hsu, J., "Receiver Compatibility of POCET Signal Combining," Proceedings of the 2011 International Technical Meeting of The Institute of Navigation, San Diego, CA, January 2011, pp. 1173-1180.
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