Topcon HiPer Pro Operator's Manual page 73

30.50mm
• SHMM to ARP vertical offset = 30.50mm
• SHMM to ARP horizontal offset = 77.75mm
Table 3-1gives the offset values for the receivers.
Table 3-1. Antenna Offset Values for Receiver Options
Up
The point to which surveying with GPS/GLONASS 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.
2. Record the antenna height, point name, and start time in the field
notes.
P/N 7010-0681
SHMM
77.75mm
Figure 3-1. HiPer Pro Antenna Offsets
To L1 Phase Center
105.9mm
Receiver Setup
ARP
To L2 Phase Center
97.1mm
3-3