Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-28T05:15:24.786Z Has data issue: false hasContentIssue false
  • English
  • Français

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])
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Avila-Rodriguez, J. A., Hein, G. W., Wallner, S., Issler, J. L., Ries, L., Lestarquit, L., Latour, A., Godet, J., Bastide, F., Pratt, T. and Owen, J. (2007). The MBOC Modulation: The Final Touch to the Galileo Frequency and Signal Plan. Proceedings of ION GNSS 20th International Technical Meeting of the Satellite Division, Fort Worth, Texas, USA, 1515–1529.Google Scholar
Betz, J. W. (1999). The Offset Carrier Modulation for GPS Modernization. Proceedings of the 1999 National Technical Meeting of the Institute of Navigation, San Diego, California, USA, 639–648.Google Scholar
Butman, S. and Timor, U. (1972). Interplex-An Efficient Multichannel PSK/PM Telemetry System, IEEE Trans. on Communication, 20(3), 415–419.Google Scholar
Dafesh, P. A. and Cahn, C. R. (2009). Phase-Optimized Constant-Envelope Transmission (POCET) Modulation Method for GNSS Signals. Proceedings of ION GNSS 22nd International Technical Meeting of the Satellite Division, Savannah, Georgia, USA, 2860–2866.Google Scholar
Dafesh, P. A. and Cahn, C. R. (2011). Application of POCET Method to Combine GNSS Signals at Different Carrier Frequencies. Proceedings of the 2011 International Technical Meeting of the Institute of Navigation, San Diego, California, USA, 1201–1206.Google Scholar
Dafesh, P. A., Bow, R., Fan, T. and Hsu, J. (2011). Receiver Compatibility of POCET Signal Combining. Proceedings of the 2011 International Technical Meeting of the Institute of Navigation, San Diego, California, USA, 1173–1180.Google Scholar
Dafesh, P. A., Cooper, L. and Partridge, M. (2000). Compatibility of the Interplex Modulation Method with C/A and P(Y) Code Signals. Proceedings of ION GPS 13th International Technical Meeting of the Satellite Division, Salt Lake City, Utah, USA, 2122–2129.Google Scholar
Fan, T., Lin, V. S., Wang, G. H. and Dafesh, P. A. (2008). Study of Signal Combining Methodologies for Future GPS Flexible Navigation Payload Part II. Proceedings of 2008 IEEE/ION Position, Location And Navigation Symposium, Monterey, California, USA, 1079–1089.CrossRefGoogle Scholar
Gao, G. (2008). Towards Navigation Based On 120 Satellites: Analyzing The New Signals, Doctoral thesis, Department of Electrical Engineering, Stanford University.Google Scholar
Global Positioning System Wing. (2010). System Engineering & Integration Interface Specification IS-GPS-200 Revision E.Google Scholar
Hoult, N., Aguado, L. E. and Xia, P. (2008). MBOC and BOC(1, 1) Performance Comparison. The Journal of Navigation, 61(4), 613–627.CrossRefGoogle Scholar
Lestarquit, L., Artaud, G. and Issler, J. L. (2008). AltBOC for Dummies or Everything You Always Wanted to Know About AltBOC. Proceedings of ION GNSS 21st International Technical Meeting of the Satellite Division, Savannah, Georgia, USA, 961–970.Google Scholar
Spilker, J. J. and Richard, S. O. (1998). Code Multiplexing via Majority Logic for GPS Modernization. Proceedings of ION GPS 11th International Technical Meeting of the Satellite Division, Nashville, Tennessee, USA, 265–273.Google Scholar
Stansell, T. A., Hudnut, K. W. and Keegan, R. G. (2010). GPS L1C: Enhanced Performance, Receiver Design Suggestions, and Key Contributions. Proceedings of ION GNSS 23rd International Technical Meeting of the Satellite Division, Portland, Oregon, USA, 2860–2873.Google Scholar
United Nations Office for Outer Space Affairs. (2010). Current and Planned Global and Regional Navigation Satellite Systems and Satellite-based Augmentations Systems. International Committee on Global Navigation Satellite Systems Providers' Forum. [Online] Available: http://www.icgsecretariat.org [Accessed].Google Scholar
Yao, Z., Lu, M. and Feng, Z. M. (2010) Quadrature Multiplexed BOC Modulation for Interoperable GNSS Signals. IEEE Electronic Letters, 46(17), 1234–1236.CrossRefGoogle Scholar