Study of signal combining methodologies for future GPS flexible navigation payload (Part II)

Tao, Fan; Lin, Vincent; Wang, G.H.; Dafesh, P. A.

doi:10.1109/plans.2008.4570115

Cited by 13 publications

(9 citation statements)

References 1 publication

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“…The combination efficiency is defined as the total useful signal power divided by the total power transmitted (Fan et al, 2008). For the GAltBOC modulation, the combination efficiency η is expressed as…”

Section: Tao Ya N a N D O T H E R S Vol 69mentioning

confidence: 99%

“…Since the power provided by the satellite payload is limited, we expect that the combination efficiency is as high as possible. The combination efficiency is defined as the total useful signal power divided by the total power transmitted (Fan et al, 2008). For the GAltBOC modulation, the combination efficiency η is expressed as where A 2 is defined by Equation (8).…”

Section: General Altboc Modulationmentioning

confidence: 99%

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General AltBOC Modulation with Adjustable Power Allocation Ratio for GNSS

et al. 2015

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Alternative Binary Offset Carrier (AltBOC) modulation signal has the constraint of an equal power allocation scheme. Thus, it is not flexible enough to meet different requirements. To solve this problem, we propose a General AltBOC (GAltBOC) modulation. The proposed technique can achieve the same function as AltBOC. Meanwhile, its power allocation ratio can be adjusted when required. The detailed derivation of the GAltBOC modulation is presented, and three representative cases as well as the signal properties are discussed. To further improve the combination efficiency, we develop the Interlacing GAltBOC (IGAltBOC) modulation based on the GAltBOC modulation. The Power Spectrum Density (PSD) and correlation functions of the proposed signals are verified by simulation. The code tracking error and implementation complexities are analysed and compared with existing methods. Results show the proposed signals indeed enhance the flexibility of power allocation ratio with the same level code tracking accuracy. Compared with AltBOC modulation, the proposed signal can reach a higher combination efficiency at the expense of relatively higher implementation complexity. Compared with Asymmetric Constant Envelope Double-sideband (ACED) modulation, the proposed signals have significantly lower complexity of signal generation, which is helpful in simplifying the signal generation in the payload transmitter. K E Y

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Section: Tao Ya N a N D O T H E R S Vol 69mentioning

confidence: 99%

Section: General Altboc Modulationmentioning

confidence: 99%

General AltBOC Modulation with Adjustable Power Allocation Ratio for GNSS

et al. 2015

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“…The Traditional Major Voting algorithm can only multiplex an even number of signals with equal power. Signals with different power should be multiplexed with Interlace technology (Fan, 2008). If there are four signals, three of them are combined into a BPSK signal with interlaced major voting.…”

Section: Multiplexing Model Of Compass B1 Bandmentioning

confidence: 99%

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

Zhang

Zhou²,

Wang

2011

J. Navigation

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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.

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“…Multiplexing efficiency is usually used to evaluate the performance of constant envelope multiplexing methods. The multiplexing efficiency is defined as the ratio of the power sum of useful signal components to total power (Fan et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

A Unified Dual-frequency Constant Envelope Multiplexing Design Framework for Modernised GNSS Signals

Yan

Wang

et al. 2018

J. Navigation

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In the field of modernised Global Navigation Satellite System (GNSS) signal design, several Dual-frequency Constant Envelope Multiplexing (DCEM) methods have been recently proposed. However, the existing DCEM methods, such as Alternative Binary Offset Carrier (AltBOC), generalised AltBOC and Asymmetric Constant Envelope Binary Offset Carrier (ACE-BOC), are only applied in some special cases. In this paper, we present a unified DCEM design framework for GNSS signals. The existing DCEM methods can be unified in this framework. First, the signal components at two carrier frequencies are combined into two single-frequency constant envelope signals. Then, the linear sum of dual-frequency signals with non-constant envelopes is obtained. Finally, the linear sum is converted into the corresponding DCEM signal by solving an optimisation problem. The proposed design framework has no strict constraints on the number, power ratio and phase relationship of the signal components. Moreover, some special design cases under this framework are also analysed in detail. The analytical results show that the proposed design method can reach higher multiplexing efficiency compared with the existing methods. Based on the proposed method, we suggest a scheme to multiplex the BeiDou regional signals and global signals at the B2 frequency. The simulation results of correlation functions and Power Spectrum Density (PSD) verify the correctness and effectiveness of the proposed design method.

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Study of signal combining methodologies for future GPS flexible navigation payload (Part II)

Cited by 13 publications

References 1 publication

General AltBOC Modulation with Adjustable Power Allocation Ratio for GNSS

General AltBOC Modulation with Adjustable Power Allocation Ratio for GNSS

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

A Unified Dual-frequency Constant Envelope Multiplexing Design Framework for Modernised GNSS Signals

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