Mitigation of multipath in DGPS ground reference stationsMultipath represents one of the most serious threats to accuracy in Differential GPS (DGPS). The theoretical foundations of multipath are presented and several multipath mitigation techniques are reviewed. Special emphasis is placed on signal diffraction methods. Reflections enter peaks and nulls in the distorted antenna pattern in a random manner. This, coupled with the oscillations in relative phase (with respect to the direct signal), results in a multipath error signature which is noise-like. Since it is noise-like, it may be significantly reduced by averaging the code phase measurements against the more stable carrier-phase measurements. Exploitation of this effect to reduce multipath error represents a significant increase in accuracy for real time DGPS. Experiments have been performed which verify these conclusions.
Document ID
19930037188
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Braasch, Michael S. (NASA Headquarters Washington, DC United States)
Van Graas, Frank (Ohio Univ. Athens, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Institute of Navigation, National Technical Meeting, San Diego, CA, Jan. 27-29, 1992, Proceedings (A93-21176 06-04)