Geodetic Iv Antenna; Choke Ring Antenna; Figure 2.2 Geodetic Iv Gps Antenna - Without And With Groundplane - ashtech Z-Xtreme System Manual

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Geodetic IV Antenna

The Geodetic IV antenna, Figure 2.2, is the standard antenna used by the base and

rover RTK systems. It is small, lightweight, and meets the needs of most users. This

is the only antenna available for use with the rover system. The other antenna option

is too large and heavy for practical use on the rover.

The Geodetic IV antenna is available with an optional groundplane attachment, which

is effective in reducing noise created by satellite signals reflecting off nearby obstruc-

tions. The technical name for this noise is multipath. The groundplane attachment

reduces the effects of multipath on the data collected. In order to be effective at

reducing the effects of multipath, the groundplane attachment significantly increases

the size and weight of the antenna. For this reason, the groundplane attachment is

only recommended for use at the base station. If the base system is to be located in

an area where obstructions, such as metal buildings, may cause multipath, the

groundplane attachment is a good option.

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

the base system is to be located in a harsh multipath environment, the choke ring

antenna is 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

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