Open AccessEffect of GPS III weighted voting on P(Y) receiver processing performance
Author(s) -
Allen David William,
Arredondo Alberto,
Barnes Daniel R.,
Betz John W.,
Cerruti Alessandro P.,
Davidson Benjamin,
Kovach Karl L.,
Utter Alexander
Publication year - 2020
Publication title -
navigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.847
H-Index - 46
eISSN - 2161-4296
pISSN - 0028-1522
DOI - 10.1002/navi.394
Subject(s) - jitter , baseband , computer science , voting , noise (video) , signal (programming language) , algorithm , telecommunications , artificial intelligence , bandwidth (computing) , politics , political science , law , image (mathematics) , programming language
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.