Ashtech Z-Surveyor Service Manual download pdf (Page 16)

8 Post-Process GPS Surveying

The Z-Xtreme supports an integral battery, removable PC card memory, and

optional internal radio. It is capable of functioning as the base or rover in RTK

and post-processed surveys. The integrated display and control panel supports

the ability to perform some survey tasks without a handheld computer.

Environmentally, the receiver meets MIL-STD-810E specifications for wind-driven

rain and dust.

GPS Antenna

In order for the GPS receiver to receive satellite signals, it must utilize an

antenna. The GPS receiver antenna is the actual collection point of the satellite

signals. It is also the point for which the position of the rover system is computed.

Therefore, to determine the location of a feature, the GPS receiver antenna must

be placed over this feature. The horizontal position of the feature is determined

by the location of the center of the antenna. The vertical position of the feature is

determined by the location of the center of the antenna minus the known height of

the antenna above the feature. Each GPS receiver in the system will have one

GPS receiver antenna.

The Z-Xtreme system offers a choice between two different GPS receiver

antennae for the base system, the Geodetic IV antenna, and the choke ring

antenna. Obstruction conditions will dictate which antenna is appropriate.

Figure 2.1. Z-Xtreme GPS Receiver

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Ashtech Z-Surveyor Service Manual Page 16