Choke Ring Antenna; Handheld Computer; Figure 2.3 Choke Ring Antenna - ashtech Z-Xtreme System Manual

For post-process surveying

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multipath, the groundplane attachment is a recommended option.

Choke Ring Antenna

The choke ring antenna, Figure 2.3, is the ultimate antenna for multipath rejection.

For points located in harsh multipath environments, the choke ring antenna would be

advisable. An example of a harsh multipath environment would be the top of a build-

ing which houses large metal compressors and air conditioning units. These struc-

tures will reflect satellite signals which the antenna may pick up. The choke ring

antenna is designed to function in the most demanding multipath environments.

A significant drawback to the choke-ring antenna is its size and weight, making the

antenna unwieldy for mobile use. For this reason, choke-ring antennas are normally

used only in surveys requiring the highest level of accuracy.

A handheld computer is an optional component of the Z-Xtreme Survey System. It

serves as a more advanced interface to the Z-Xtreme GPS receiver. Although the Z-

Xtreme has a built-in interface, it is limited in its capabilities. The handheld computer,

running field application software (discussed below), expands on the receiver inter-

face, providing more control and functionality. If the kinematic data collection method

is intended to be utilized, it is highly recommended that one handheld computer be

Post-Process GPS Surveying

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