Ashtech Z-Surveyor Service Manual download pdf (Page 40)

32 Post-Process GPS Surveying

The rover system for a kinematic survey is set up in a slightly different manner due

to the fact that kinematic data collection is dynamic in nature, i.e. the operator must

be able to easily move around the project site with the rover system in order to

position objects of interest. This requires that the rover system be set up in a man-

portable configuration, as described below.

1. Mount GPS antenna on Rover pole

For kinematic data collection, the rover antenna is mounted on a fixed-height

pole carried by the operator, as shown in Figure 4.6. The pole includes a

level vial to assist the operator in leveling the pole and antenna over the

features to be surveyed.

2. Measure and record instrument height (HI) of GPS antenna

Remember that measurements of satellite data are made at the center

(horizontally and vertically) of the GPS antenna. The HI allows the computed

position of the antenna center to be transferred to the ground. It is critical that

the HI of the antenna above the ground is measured accurately. It can be

physically measured, or the HI can be calculated based on the known fixed

length of the pole plus the length of the quick-release and the thickness of the

antenna from the base to the data measurement point.

3. Mount handheld computer

For kinematic method of data collection, a handheld computer is highly

recommended. The computer is mounted onto the pole along with the GPS

Figure 4.6. Geodetic IV GPS Antenna on Rover Pole

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Ashtech Z-Surveyor Service Manual Page 40