Browse by author
Lookup NU author(s): Dr Hal Strangeways
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
A method of determining spectral parameters p (slope of the phase PSD) and T (phase PSD at 1 Hz) and hence tracking error variance in a GPS receiver PLL from just amplitude and phase scintillation indices and an estimated value of the Fresnel frequency has been previously presented. Here this method is validated using 50 Hz GPS phase and amplitude data from high latitude receivers in northern Norway and Svalbard. This has been done both using (1) a Fresnel frequency estimated using the amplitude PSD (in order to check the accuracy of the method) and (2) a constant assumed value of Fresnel frequency for the data set, convenient for the situation when contemporaneous phase PSDs are not available. Both of the spectral parameters (p, T) calculated using this method are in quite good agreement with those obtained by direct measurements of the phase spectrum as are tracking jitter variances determined for GPS receiver PLLs using these values. For the Svalbard data set, a significant difference in the scintillation level observed on the paths from different satellites received simultaneously was noted. Then, it is shown that the accuracy of relative GPS positioning can be improved by use of the tracking jitter variance in weighting the measurements from each satellite used in the positioning estimation. This has significant advantages for scintillation mitigation, particularly since the method can be accomplished utilizing only time domain measurements thus obviating the need for the phase PSDs in order to extract the spectral parameters required for tracking jitter determination.
Author(s): Strangeways HJ, Ho YH, Aquino MHO, Elmas ZG, Marques HA, Monico JFG, Silva HA
Publication type: Article
Publication status: Published
Journal: Radio Science
Year: 2011
Volume: 46
Issue: 6
Pages: -
Print publication date: 04/08/2011
ISSN (print): 0048-6604
ISSN (electronic): 1944-799X
Publisher: Wiley-Blackwell Publishing, Inc.
URL: http://dx.doi.org/10.1029/2010RS004575
DOI: 10.1029/2010RS004575
Notes: ARTN RS0D15
Altmetrics provided by Altmetric
