Ashtech Z-Surveyor Service Manual download pdf (Page 18)

10 Post-Process GPS Surveying

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

building which houses large metal compressors and air conditioning units. These

structures 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.

Handheld Computer

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 interface, 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 included with the system.

Figure 2.3. Choke Ring Antenna

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Ashtech Z-Surveyor Service Manual Page 18