DocumentCode :
2782695
Title :
Discontinuity-Based Code Delay Estimator for GNSS Signals
Author :
Skournetou, Danai ; Lohan, Elena Simona
Author_Institution :
Inst. of Commun. Eng., Tampere Univ. of Technol., Tampere
fYear :
2008
fDate :
26-28 Aug. 2008
Firstpage :
213
Lastpage :
222
Abstract :
Undoubtedly, accurate line-of-sight (LOS) code delay estimation is encountered among the most challenging synchronization problems in the context of Global Navigation Satellite Systems (GNSSs). However, the way towards achieving high accuracy is seriously hindered by the various error sources affecting the transmitted satellite signal. Particularly, the destructive nature of multipath environments has posed several limitations in the tracking performance, thus increasing the need for estimators, resistant against multipath delays. In this paper, we present a new code delay estimator for binary offset carrier (BOC) and BPSK modulated signals, the so-called DiscTracker, which combines features from both feedback and feedforward approaches. The proposed estimator is tested in multipath static and in multipath fading channels and its performance is compared with a set of state-of-art estimators in terms of root mean square error (RMSE) and mean time to lose lock (MTLL). The simulation results show that DiscTracker is robust in closely-spaced multipath scenarios and resistant to non-zero initial code delay errors.
Keywords :
delay estimation; fading channels; mean square error methods; multipath channels; phase shift keying; satellite navigation; BPSK modulated signals; DiscTracker; GNSS signals; Global Navigation Satellite Systems; binary offset carrier modulation; closely-spaced multipath scenarios; discontinuity-based code delay estimator; line-of-sight code delay estimation; mean time to lose lock; multipath fading channels; multipath static channels; nonzero initial code delay; root mean square error; Binary phase shift keying; Delay estimation; Fading; Feedback; Global Positioning System; Modulation coding; Root mean square; Satellite navigation systems; State estimation; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Satellite Mobile Systems, 2008. ASMS 2008. 4th
Conference_Location :
Bologna
Print_ISBN :
978-1-4244-2160-2
Type :
conf
DOI :
10.1109/ASMS.2008.44
Filename :
4620267
Link To Document :
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