Net-G3A Configuration and Setup
NET-G3A Operator’s Manual
3-24
• Model of the antenna used
Antennas have two types of measurements:
• Vertical – measured from the marker to the antenna reference
point (ARP) located on the bottom of the antenna at the base of
the mounting threads.
• Slant – measured from the marker to the lower edge of the
antenna slant height measure mark (SHMM).
The point to which all measurements are being referenced is called
the Phase Center of the antenna. This is analogous to the point at
which a distance meter measures in a prism. A user must enter the
prism offset to compensate for this point not being at a physical
surface of the prism. For a GNSS antenna, the offset is entered
depending on the type of measurement taken.
• For vertical, the offset is simply added to the measured vertical
height to produce a “true” vertical height.
• For slant height, the vertical height must first be calculated using
the radius of the antenna, then the offset can be added.
The offsets are different because of the difference in location between
the slant measuring point and the vertical measuring point.
1. Measure the antenna height above the control point or marker,
either the slant height or the vertical height (Figure 3-18 on
page 3-25).
2. Record the antenna height, point name, and start time in the field
notes.
The height of the antenna and it’s offsets depend on the type of
antenna used. Refer to the antenna’s documentation for details.
NOTICE
Refer to the antenna’s offset measurements card for
measurement and offset details.
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