Gps Antenna; Figure 2.1 Z-Xtreme Gps Receiver - ashtech Z-Xtreme System Manual

For post-process surveying

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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-pro-

cessed surveys. The integrated display and control panel supports the ability to per-

form 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 loca-

tion 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. Obstruc-

Post-Process GPS Surveying

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