Abstract
Sidereal filtering is the name of a technique used to reduce the effect of multipath interference on a GPS position time series associated with a static or quasi-static antenna. This article assesses the impact of a GPS satellite outage on the performance of a sidereal filter. Two different types of sidereal filter are tested: a position-domain sidereal filter (PDSF) and an observation-domain sidereal filter (ODSF). A satellite outage is simulated at two static receivers with contrasting antenna types and multipath environments. At both stations, the ODSF is more effective than a PDSF at removing multipath error over averaging intervals under around 200 seconds in length whether there is an outage or not. However, difference in the performance of the two types of sidereal filter was much more significant at the station more prone to multipath interference. The results are particularly relevant for applications where high-rate precise point positioning (PPP) is used for monitoring: If a PDSF is applied, then errors due to highfrequency multipath interference may still alias into the resulting position time series if a satellite outage occurs and possibly increasing the false alarm rate. In contrast, an ODSF is likely to perform better in such circumstances.
References
Agnew D.C. and Larson K.M., 2007, Finding the repeat times of the GPS constellation, GPS Solut., 11, 71-76, doi: 10.1007/s10291-006-0038-4.Search in Google Scholar
Allan D.W., 1966, Statistics of atomic frequency standards, Proc. IEEE 54:221-230, doi: 10.1109/PROC.1966.4634.Search in Google Scholar
Atkins C., 2016, Observation-domain sidereal filtering for high-rate GPS precise point positioning, University College London.10.1007/s10291-015-0473-1Search in Google Scholar
Atkins C. and Ziebart M., 2016, E_ectiveness of observation-domain sidereal filtering for GPS precise point positioning, GPS Solut., 20, 111-122, doi: 10.1007/s10291-015-0473-1.Search in Google Scholar
Axelrad P., Larson K.M. and Jones B., 2005, Use of the correct satellite repeat period to characterize and reduce site-specific multipath errors, Proceedings of ION GNSS 2005, Long Beach, CA, 2638-2648.Search in Google Scholar
Bar-Sever Y.E., Kroger, P.M. and Borjesson, J.A., 1998, Estimating thehorizontal gradients of tropospheric path delay with a single GPS receiver, J. Geophys. Res., 103(B3), 5019-5035.10.1029/97JB03534Search in Google Scholar
Boehm J., Niell A., Tregoning P. and Schuh H., 2006, Global Mapping Function (GMF): a new empirical mapping function based on numerical weather data, Geophys. Res. Lett., 33, L07304, doi: 10.1029/2005GL025546.Search in Google Scholar
Chen D., Ye S., Xia J., Liu Y. and Xia P., 2016, A geometry-free and ionosphere-free multipath mitigation method for BDS threefrequency ambiguity resolution, J. Geodesy, 90, 703-714, doi: 10.1007/s00190-016-0903-z.Search in Google Scholar
Collins P., Lahaye F., Heroux P. and Bisnath S., 2008, Precise point positioning with ambiguity resolution using the decoupled clock model, Proceedings of ION GNSS 2008, Savannah, GA, 1315-1322.Search in Google Scholar
Dach R., Hugentobler U., Fridez P. and Meindl M., 2007, Bernese GPS software version 5.0. Usermanual, Astronomical Institute, University of Bern.Search in Google Scholar
Fuhrmann T., Luo X., Knöpfler A. and Mayer M., 2014, Generating statistically robust multipath stacking maps using congruent cells, GPS Solut., 19, 83-92, doi: 10.1007/s10291-014-0367-7.Search in Google Scholar
Ferre-Pikal E. and Walls F., 2005, Frequency standards, characterization, Encycl. RF Microw. Eng., John Wiley and Sons, Inc., Hoboken, N.J., 767-775.10.1002/0471654507.eme135Search in Google Scholar
Ge M., Gendt G., Rothacher M., Shi C. and Liu J., 2008, Resolution of GPS carrier-phase ambiguities in precise point positioning (PPP) with daily observations, J. Geod., 82, 389-399, doi: 10.1007/s00190-007-0187-4.Search in Google Scholar
Larson K.M., Bilich A.L. and Axelrad P., 2007, Improving the precision of high-rate GPS, J. Geophys. Res. Sol. Ea., 112, B05422, doi: 10.1029/2006JB004367.Search in Google Scholar
Laurichesse D., Mercier F., Berthias J.-P. and Broca P., 2009, Integer ambiguity resolution on undifferenced GPS phase measurements and its application to PPP and satellite precise orbit determination, Navigation, 56, 135-143, doi: 10.1016/S0273-1177(02)00277-6.Search in Google Scholar
Weinbach U., 2013, Feasibility and impact of receiver clock modeling in precise GPS data analysis, Leibniz University of Hannover.Search in Google Scholar
Ye S., Chen D., Liu Y., Jiang P., Tang W. and Xia P., 2015, Carrier phase multipath mitigation for BeiDou navigation satellite system, GPS Solut., 19, 545-557, doi: 10.1007/s10291-014-0409-1.Search in Google Scholar
© by C. Atkins
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