Global Positioning System Reference
In-Depth Information
example when the “blue” network is used, where the effect of few outliers positions, not
detected in real-time by the receiver, disappears only after 5 hours of measurements.
Fig. 8. Positioning quality of a geodetic receiver when a VRS correction is used: CDF of the
planimetric error (top left) and of the elevation error (top right), cumulative moving average
of the planimetric error (bottom left) and of the three-dimensional positioning error (bottom
right)
7.1.2 MAC positioning
As said previously, the MAC correction is realized using observations from a single
reference station (master) with additional information of other CORSs within a well-defined
cell of the network (auxiliary stations). For this reason, this correction should be less
sensitive to the variation of GNSS network sizes. As long as the distance between the master
station and the rover is maintained below the permissible values for differential real-time
positioning, the variation of the network size represents only a minor contribution to the
differential correction (i.e., the contribution due to the auxiliary stations). The tests allow to
extract an “average” behaviour of a geodetic dual frequency receiver when a MAC
correction is used. This behaviour is summarized in the Fig. 9.
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