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6 Back in the Office<br />

6.4 Postprocessed Differential Correction<br />

C<br />

C<br />

The data collected by GPS receivers is subject to errors. The vast<br />

majority of these errors can be removed from the data by differential<br />

correction.<br />

When this is applied to the data file, submeter C/A code position<br />

accuracy can be achieved using a GPS Pathfinder Pro XR,<br />

Pro XRS, Pro XL, 4600LS, Site Surveyor 4400, GPS Total<br />

Station ® 4700, GPS Total Station 4800, or Series 4000 receiver.<br />

Warning – If you are going to permanently average positions, adjust the<br />

2D records, or manipulate the file in other ways in addition to differential<br />

correction, perform differential correction first.<br />

Warning – Although there are no real advantages of collecting carrier<br />

data over code data at distances greater than 35 km, the GPS Pathfinder<br />

Office software does not restrict the user with distance limits between the<br />

rover and base when processing in Carrier Only mode. However, when<br />

processing in Smart mode, the GPS Pathfinder Office software will not<br />

process carrier data collected more than 75 km from the base.<br />

152 TSC1 Asset Surveyor Operation Manual

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