The selection of reference station

The selection of reference station should be considered. The base station is generally selected in the middle of the survey area and the terrain is relatively high, and there should be no large area of water, tall trees, buildings or electromagnetic interference sources (such as the transmitter tower of the radio station, high-voltage wires, etc.) beside it.⑥ The radio should not be placed too close to the GPS receiver, otherwise the radio signal will interfere with the GPS satellite signal. At the same time, the signal line and power line of the radio station should not be rolled up when they are too long, which will cause magnetic field interference to GPS signal due to eddy current.⑦ When the GPS signal loses its lock, it needs to be reinitialized (i.e. static observation for a few minutes). When the satellite is locked again, it needs to observe the broken points. In order to ensure safety and reliability, it is better to return to the reference point for verification.