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Positioning  2011 

Limited Bandwidths and Correlation Ambiguities: Do They Co-Exist in Galileo Receivers

DOI: 10.4236/pos.2011.21002, PP. 14-21

Keywords: Binary Offset Carrier (BOC), Composite Binary Offset Carrier (CBOC), Galileo, Global Navigation Satel-lite Systems (GNSS), Narrowband GNSS Receiver, Unambiguous Acquisition

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Abstract:

Galileo is the Global Navigation Satellite System that Europe is building and it is planned to be operational in the next 3-5 years. Several Galileo signals use split-spectrum modulations, such as Composite Binary Offset Carrier (CBOC) modulation, which create correlation ambiguities when processed with large or infinite front-end bandwidths (i.e., in wideband receivers). The correlation ambiguities refer to the notches in the correlation shape (i.e., in the envelope of the correlation between incoming signal and reference modulated code) which happen within +/– 1 chip from the main peak. These correlation ambiguities affect adversely the detection probabilities in the code acquisition process and are usually dealt with by using some form of unambiguous processing (e.g., BPSK-like techniques, sideband processing, etc.). In some applications, such as mass-market applications, a narrowband Galileo receiver (i.e., with considerable front-end bandwidth limitation) is likely to be employed. The question addressed in this paper, which has not been answered before, is whether or not this bandwidth limitation can cope inherently with the ambiguities of the correlation function, to which extent, and which the best design options are in the acquisition process (e.g., in terms of time-bin step and ambiguity mitigation mechanisms).

References

[1]  J. Betz and P. Capozza, “System for Direct Acquisition of Received Signals,” In: US Patent Application Publication, US, April 2004.
[2]  B. Barker, J. Betz, J. Clark, J. Correia, J. Gillis, S. Lazar, K. Rehborn and J. Straton, “Overview of the GPS M Code Signal,” CDROM Proceedings of NMT, 2000.
[3]  J. W. Betz, “The Offset Carrier Modulation for GPS Modernization,” In: Proceedings of ION Technical Meeting, 1999, pp. 639-648.
[4]  E. S. Lohan, A. Lakhzouri and M. Renfors, “Binary-Off- set-Carrier Modulation Techniques with Applications in Satellite Navigation Systems,” Journal of Wireless Communications and Mobile Computing, Wiley, July 2006.
[5]  F. Dovis, P. Mulassano and D. Margaria, “Multiresolution Acquisition Engine Tailored to the Galileo AltBOC Signals,” In: ION-GNSS, 2007.
[6]  E. Lohan, A. Lakhzouri and M. Renfors, “Complex Double-Binary-Offset-Carrier modulation for a Unitary Characterization of Galileo and GPS signals,” IEE Proceedings on Radar, Sonar, and Navigation, Vol. 153, No. 5, 2006, pp. 403-408. doi:10.1049/ip-rsn:20060005
[7]  J. Avila-Rodriguez, S. Wallner, G. Hein, E. Rebeyrol, O. Julien, C. Macabiau, L. Ries, A. DeLatour, L. Lestarquit and J. Issler, “CBOC - An Implementation of MBOC,” In: First CNES Workshop on Galileo Signals and Signal Pro- cessing, France, October 2006.
[8]  G. Hein, J. Avila-Rodriguez, S. Wallner, J. Betz, C. Hegarty, J. Rushanan, A. Kraay, A. Pratt, S. Lenahan, J. Owen, J. Issler and T. Stansell, “MBOC: The New Optimized Spreading Modulation Recommended for GALILEO L1 OS and GPS L1C,” In: Inside GNSS - Working Papers, Vol. 1, No. 4, 2006, pp. 57-65.
[9]  E. Lohan, “Statistical Analysis of BPSK-Like Techniques for the Acquisition of Galileo Signals,” AIAA Journal of Aerospace Computing, Information, and Communication, Vol. 3, May 2006, pp. 234-243. doi:10.2514/1.17441
[10]  P. Fishman and J. Betz, “Predicting Performances of Direct Acquisition for the M-Code Signal,” In: ION-NMT, 2000.
[11]  N. Martin, V. Leblond, G. Guillotel and V. Heiries, “BOC (x,y) Signal Acquisition Techniques and Performances,” In: ION GPS, 2003.
[12]  V. Heiries, D. Oviras, L. Ries and V. Calmettes, “Analysis of Non-Ambiguous BOC Signal Acquisition Perfor- mance,” In: ION-GNSS, 2004.
[13]  E. Lohan, A. Burian and M. Renfors, “Low-Complexity Acquisition Methods for Split-Spectrum CDMA Signals,” Wiley International Journal of Satellite Communications, Vol. 26, 2008, pp. 503-522.
[14]  A. Burian, E. Lohan and M. Renfors, “BPSK-Like Methods for Hybrid-Search Acquisition of Galileo Signals,” In: IEEE International Conference on Communications, 2006, pp. 5211-5216. doi:10.1109/ICC.2006.255493
[15]  A. Burian, E. Lohan, V. Lehtinen and M. Renfors, “Complexity Considerations for Unambiguous Acquisition of Galileo Signals,” In: 3rd Workshop on Positioning, Navigation and Communication, Germany, 2006, pp. 65-73.
[16]  European GNSS (Galileo) Open Service, “Signal in Space Interface Control Document (OS SIS ICD),” 2010.
[17]  E. S. Lohan and M. Renfors, “Correlation Properties of Multiplexed-BOC (MBOC) Modulation for Future GNSS Signals,” In: European Wireless Conference, France, 2007.
[18]  E. S. Lohan, “Analytical Performance of CBOC - Modulated Galileo E1 Signal Using Sine BOC (1,1) Receiver for Mass-Market Applications,” In: PLANS, 2010.

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