Effect of GPS III weighted voting on P(Y) receiver processing performance

David William Allen, Alberto Arredondo, Daniel R. Barnes Capt., John W. Betz, Alessandro P. Cerruti, Benjamin Davidson, Karl L. Kovach, Alexander Utter

Peer Reviewed

Abstract: Signal generation in the GPS III satellites employs weighted voting to combine the baseband P(Y) signal with both components of the baseband L1C signal on the in-phase part of the L1 carrier. Weighted voting employs majority voting with pseudorandom time multiplexing of pure signals, producing a constant-envelope real-valued combination of the three biphase inputs with different useful received powers. Weighted voting introduces jitter into receivers’ correlation functions, adding to jitter from noise and interference. This paper quantifies the effect of weighted voting on receiver input signal-to-noise ratio (SNR), then predicts the effect of weighted voting on carrier tracking by conventional, codeless, and semicodeless P(Y) receivers. Analysis and computer simulation results are supplemented by receiver measurements, providing conclusive evidence that degradation by weighted voting is evident only at high SNR, having an insignificant effect on receiver performance.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 67, Number 4
Pages: 675 - 689
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