User's Manual

HiPer Ga/Gb Receiver Setup and Survey
HiPer Ga/Gb Operator’s Manual
4-12
This method of GPS survey allows the operator to reduce the point
occupation time, thus permitting field crews to survey many more
points compared to the other methods available.
Real Time Kinematic
Surveying
In RTK surveying, one receiver serves as the reference station. The
receiver conducts observations with its antenna affixed to a stationary
tripod or another device. The second receiver functions as a rover and
conducts observations (using an antenna) affixed to a mobile pole and
moved to observation points.
Unlike post-processed kinematic surveys, RTK surveys use a
communications link between the Base and Rover. Using a radio
modem link, the Base receiver transmits its measurement and location
data to the Rover receiver. The Rover, based on the transmitted data
and its own observation data, immediately conducts a baseline
analysis and outputs the results. For specific settings used in RTK
surveys, see “Configuring the Radio Modem” on page 3-3 and
“Configuring the Receiver” on page 3-7.
If using PC-CDU to monitor an RTK Rover receiver, check the LQ
field on the main screen (Figure 4-7 on page 4-13) to ensure the
receiver obtains differential corrections. Usually, the receiver starts to
output the coordinates of the antenna’s phase center along with the
solution type within 10–30 seconds; however, spread spectrum radios
and GSM phones may take as long as 60 seconds to synchronize.
The geodetic coordinates displayed on the Geo tab are always
computed in WGS84 and have four solution types.
• Standalone – where the receiver computes 3D coordinates in
autonomous mode without using differential corrections.
• Code differential – where the Rover receiver computes the current
relative coordinate in differential mode using only pseudo ranges.
• RTK float – where the Rover receiver computes the current
relative coordinates in differential mode using both pseudo ranges