Contributions of Differential GPS and GLONASS Observations to Point Accuracy under Forest Canopies

Contributions of Differential GPS and GLONASS Observations to Point Accuracy under Forest Canopies Erlk Naesset, Trygve Bjerke, Ola Bvstedal, and Lore...
Author: William Chase
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Contributions of Differential GPS and GLONASS Observations to Point Accuracy under Forest Canopies Erlk Naesset, Trygve Bjerke, Ola Bvstedal, and Lorentz H. Ryan

1996;Naesset, 1999).When differential positioning is used, the two receivers collect data simultaneously, and common errors and carrier phase of both GPS and GLONASS was used to deter- in the two receivers are limited. However, site-dependent mine the positional accuracy of 27 points under tree canopies. errors are not reduced by differencing between receivers. Two observables are available for positioning with GPS,i.e., The mean positional accuracy based on combined differential postprocessing of GPS C/A code and carrier phase observations the pseudorange determined from the C I A code and the carrier ranged from 0.20 m to 5.72 m for 2.5min to 30 min of observa- phase. The carrier phase is the basis of the techniques used for tion at points with basal area rangingfrom

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