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Multiplexing Performance Assessment of POCET Method for Compass B1/B3 Signals

Published online by Cambridge University Press:  14 October 2011

Kai Zhang ,
Hongwei Zhou  and
Feixue Wang
Kai Zhang*
Affiliation:
(Satellite Navigation R&D Center, National University of Defense Technology, Changsha, 410073, China)
Hongwei Zhou
Affiliation:
(Beijing Institute of Tracking and Telecommunication Technology, Beijing, 100094, China)
Feixue Wang
Affiliation:
(Satellite Navigation R&D Center, National University of Defense Technology, Changsha, 410073, China)
*
(Email: [email protected])
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Abstract

Compared with traditional GPS signals, modern GNSS signals are much more complex and have various new modulations. This introduces a difficulty in combining multiple signal components into a constant-envelope signal that maximises the power efficiency of High Power Amplifiers (HPA) on satellites. This paper first describes the fundamental Phase-Optimised Constant-Envelope Transmission (POCET) technique that searches the optimum combining solution for multiple binary navigation signals. Then the Compass B1/B3 signals are modelled by POCET. For the B1 band, a binary complex sub-carrier is adopted to implement the centre frequency difference between regional and global Compass navigation systems. Regional B1 Open Service (OS) signals and global TMBOC signals are combined with optimum loss of 1·0 dB. For the B3 band, Interplex modulation is proved to be the optimum method to combine QPSK (10) and BOC (15, 2·5) signals. Signal quality in the presence of finite word-length effects of Digital-Analog (DA) converters is analysed. Simulations for signal model validation are conducted. The result indicates that relative amplitude error less than 0·01 and angle error less than 0·1 degree can be achieved with 10 bit DA converters. The POCET method is demonstrated as an efficient solution for Compass signals.

Keywords

Phase-Optimised Constant-Envelope TransmissionCompass Navigation SystemMBOC
Type
Research Article
Information
The Journal of Navigation , Volume 64 , Supplement S1: Chinese Beidou and the Next Generation GNSS , November 2011 , pp. S41 - S54
Copyright
Copyright © The Royal Institute of Navigation 2011

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