Topcon HiPER GD, Руководство оператора

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Setup and Survey
Topcon HiPer GD and HiPer GGD Operator’s Manual
3-4
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.
3. Press the power key and release it to turn the receiver on.
The STAT (status) light (LED) will blink red at first.
4. Once the receiver has locked on to one or more satellites,
the STAT light will blink green for GPS satellites, orange
for GLONASS satellites, and a short red blink indicating it
has not solved a position. Four or more satellites provide
optimal positioning.
5. Once the short red blink is gone, the receiver has a position
and surveying can begin. You should wait for green and
orange lights before beginning data collection. This ensures
that the receiver has the correct date and time, and is locked
on to enough satellites to ensure good quality data.
The process of locking on to satellites normally takes less
than one minute. In a new area, under heavy tree canopy, or
after resetting the receiver, it may take several minutes.