When you start an RTK survey, if base corrections are being received and there are sufficient satellites, the survey initializes automatically using the on the fly initialization method. A survey must be initialized before centimeter‑level surveying can begin. If required, To initialize on a known point.
After initialization, the survey mode changes from Not initialized to Initialized. The mode remains Initialized if the receiver continuously tracks the minimum number of satellites. If the mode changes to Not initialized, you must reinitialize the survey.
Initialization reliability depends on the initialization method used and whether multipath occurred during the initialization phase. Multipath occurs when GNSS signals are reflected off objects, such as the ground, a building, or trees. When initializing, always choose a site that has a clear view of the sky and is free of obstructions that could cause multipath. The initialization process in Trimble receivers is very reliable, but to reduce the effects of multipath, use good survey practice and periodically check your initialization by measuring previously measured points with a new initialization. To reduce the effects of multipath during an on-the-fly initialization, move around.
The number of satellites required depends on whether you are using satellites from only one constellation or a combination of constellations. After initialization, a position can be determined and the initialization can be maintained with one satellite less than the number required to initialize. If the number of satellites drops below this number, the survey must be reinitialized.
The minimum L1/L2 satellites required are:
|Satellite systems||Required satellites for initialization||Required satellites to produce positions|
|GPS only||5 GPS||4 GPS|
|GPS + QZSS||4 GPS + 1 QZSS||3 GPS + 1 QZSS|
|GPS + GLONASS||4 GPS + 2 GLONASS||3 GPS + 2 GLONASS|
|GPS + BeiDou||4 GPS + 2 BeiDou||3 GPS + 2 BeiDou|
|GPS + Galileo||4 GPS + 2 Galileo||3 GPS + 2 Galileo|
|BeiDou only||5 BeiDou||4 BeiDou|
|BeiDou + GPS||4 BeiDou + 2 GPS||3 BeiDou + 2 GPS|
|BeiDou + GLONASS||4 BeiDou + 2 GLONASS||3 BeiDou + 2 GLONASS|
You cannot initialize if the PDOP is greater than 7.
- Tap and select Measure and then select RTK initialization.
- In the Method field select one of the following:
- Reset RTK (only available when connected to an R10 receiver)
Reset SV tracking to drop all satellite tracking, reaquire satellites and reinitialize the RTK survey
Resetting SV tracking in compromised GNSS environments is not recommended.
Tap Reset or Start.
A message confirms when the receiver is initialized.