Discontinuity-Based Code Delay Estimator for GNSS Signals

Skournetou, Danai; Lohan, Elena Simona

doi:10.1109/asms.2008.44

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Skournetou et al [4] develop in 2008 on the "DiskTracker", a code delay estimator which shows resistance against initial phase errors by exploiting the advantages of combined feedback and feedforward loops, at the expenses of larger processing windows.…”

Section: Classical and State-of-the-art Techniquesmentioning

confidence: 99%

A robust bias detection method in the frequency domain for code delay estimation applied to modern navigation modulations.

Prim

2010

IEEE/ION Position, Location and Navigation Symposium

View full text Add to dashboard Cite

The present paper develops an innovative method in the frequency domain for code delay false lock detection and resolution, applicable to GNSS receivers compatible with subcarrier navigation modulations.This novel technique is based on the cross-spectrum estimation between the cross-correlation of received and locally generated spreading codes, and its well-know theoretical non-shifted autocorrelation. The code delay bias is then obtained back in the time domain, and subtracted in closed loop from the output of the numerically controlled oscillator that generates the delayed code replicas in a classical early-prompt-late GNSS receiver architecture.Parametrical optimization pending, this novel technique already shows an entire reduction of systematic errors on the estimated code delay in AWGN channels for BOCcos(10, 5) on Galileo E6a and BOCcos(15, 2.5) on Galileo E1a, with virtually no additional performance degradation in terms of code delay jitter.

show abstract

Section: Classical and State-of-the-art Techniquesmentioning

confidence: 99%

A robust bias detection method in the frequency domain for code delay estimation applied to modern navigation modulations.

Prim

2010

IEEE/ION Position, Location and Navigation Symposium

View full text Add to dashboard Cite

show abstract

“…While improving the delay estimation accuracy, these approaches typically require more correlators than DLL-based ones and are sensitive to the noise-dependent threshold choice. Various combinations of feedback and feedforward approaches aim at improved accuracy [9,10]. In the carrier tracking stage, multipath mitigation has been a challenging problem as well.…”

Section: Introductionmentioning

confidence: 99%

Performance of Deconvolution Methods in Estimating CBOC-Modulated Signals

Skournetou

Sayed

Lohan

2011

International Journal of Navigation and Observation

Self Cite

View full text Add to dashboard Cite

Multipath propagation is one of the most difficult error sources to compensate in global navigation satellite systems due to its environment-specific nature. In order to gain a better understanding of its impact on the received signal, the establishment of a theoretical performance limit can be of great assistance. In this paper, we derive the Cramer Rao lower bounds (CRLBs), where in one case, the unknown parameter vector corresponds to any of the three multipath signal parameters of carrier phase, code delay, and amplitude, and in the second case, all possible combinations of joint parameter estimation are considered. Furthermore, we study how various channel parameters affect the computed CRLBs, and we use these bounds to compare the performance of three deconvolution methods: least squares, minimum mean square error, and projection onto convex space. In all our simulations, we employ CBOC modulation, which is the one selected for future Galileo E1 signals.

show abstract

Ionosphere-corrected range estimation in dual frequency global navigation satellite systems receivers

Skournetou

Lohan

2011

IET Radar Sonar Navig.

View full text Add to dashboard Cite

Discontinuity-Based Code Delay Estimator for GNSS Signals

Cited by 3 publications

References 8 publications

A robust bias detection method in the frequency domain for code delay estimation applied to modern navigation modulations.

A robust bias detection method in the frequency domain for code delay estimation applied to modern navigation modulations.

Performance of Deconvolution Methods in Estimating CBOC-Modulated Signals

Ionosphere-corrected range estimation in dual frequency global navigation satellite systems receivers

Contact Info

Product

Resources

About