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Assessment of Radio Frequency Compatibility between Compass Phase II and Other GNSSs

Published online by Cambridge University Press:  14 October 2011

Li Liu ,
Xingqun Zhan ,
Wei Liu  and
Mancang Niu
Li Liu*
Affiliation:
(School of Aeronautics and Astronautics, Shanghai Jiao Tong University)
Xingqun Zhan
Affiliation:
(School of Aeronautics and Astronautics, Shanghai Jiao Tong University)
Wei Liu
Affiliation:
(School of Aeronautics and Astronautics, Shanghai Jiao Tong University)
Mancang Niu
Affiliation:
(School of Aeronautics and Astronautics, Shanghai Jiao Tong University)
*
(Email: amanda@softfoundry.com)
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Abstract

As the technology of global navigation satellite system (GNSS) and augmentation systems are evolving rapidly, compatibility becomes a critical issue for system providers. By April 2011, China had successfully launched eight satellites of the Compass phase II (CP II) navigation system, which will provide positioning, navigation, timing and communication services to the Asia-Pacific region by the year 2012. Due to the limitations of available radio frequency bandwidths, it is important to assess the compatibility and to design signals based on the compatibility within these limited radio frequency bandwidths. This paper presents a modified compatibility assessment methodology, derived from the traditional methodologies that are based on the spectral separation coefficient (SSC) and the effective carrier-power-to-noise density ratio. The modified methodology takes into account additional factors including the Doppler offset, code tracking loop, and band-limiting, sampling and quantisation (BSQ) of the GNSS receiver. In the simulation section, the comprehensive compatibility assessment between CP II and other GNSSs, such as GPS, Galileo, Wide Area Augmentation System (WAAS) and European Geostationary Navigation Overlay Service (EGNOS) on L1 Band are carried out and presented with some new results. Simulation results reveal that CP II does not cause serious interference on GPS, Galileo, WAAS and EGNOS as the interference level is below the 0·25 dB threshold recommended by ITU.

Keywords

CompatibilityGNSSDoppler offsetBand-limiting, sampling and quantization
Type
Research Article
Information
The Journal of Navigation , Volume 64 , Supplement S1: Chinese Beidou and the Next Generation GNSS , November 2011 , pp. S55 - S72
Copyright
Copyright © The Royal Institute of Navigation 2011

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