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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, the authors present a new code delay estimator for BOC and BPSK modulated signals, the so-called DiscTracker, which combines features from both feedback and feed-forward approaches.
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