www.javad.com Maxor Operator’s Manual 3-3
SETUP AND MEASURING
Maxor Receiver Setup
1. Measure the antenna height above the point or marker (see “External
Antenna Setup” on page 3-4 for external antenna measurements and
setup).
Figure 3-1 illustrates the ant
enna offsets. (See Figure 1-3 on page 1-12
and Figure 1-4 on page 1-13 for the exact SHMM location.)
Figure 3-1. Maxor GD and Maxor GGD Antenna Offsets
• SHMM to ARP vertical offset = 30.5 mm
• SHMM to ARP horizontal offset = 79.5 mm
Table 3-1 gives the offset values for the receivers.
The actual point to which measuring with GPS/GLON
ASS measures 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. In the case of a GPS/GLONASS 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 not the
same number because of the difference in location between the slant
measuring point and the vertical measuring point.
Table 3-1.
Antenna Offset Values
To L1 Phase Center To L2 Phase Center
North -1.7 mm -1.2 mm
East -0.8 mm -0.8 mm
Up 106.0 mm 101.2 mm
79.5mm
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