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System Components 9

System Components

Geodetic IV

The Geodetic IV antenna, Figure 2.2, is the standard antenna offered.

The Geodetic IV is small, lightweight, and meets the needs of most users. It is

available with an optional groundplane attachment, which is effective in reducing

noise created by satellite signals reflecting off of nearby obstructions. The

technical name for this noise is multipath. Using the groundplane attachment will

reduce 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 not recommended for use on a kinematic rover. If points for static

data collection or placement of a kinematic base are located in areas where

obstructions, such as metal buildings, may cause multipath, the groundplane

attachment is a recommended option.

Figure 2.2. Geodetic IV Antenna without and with Groundplane

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Ashtech Z-Surveyor Service Manual Page 17