3. RTK: Base Receiver

To configure the base receiver:

  1. The External Receiver box is enabled for a controller that has an internal GNSS receiver. You can select a connection with the internal GNSS receiver or any external GNSS receiver. If the controller does not have a GNSS receiver or the software is installed on the computer, the External Receiver box is always checked. The connection to the external receivers (except NET G5 and HiPer HR receivers) can be Bluetooth and Serial Cable. For NET G5 and HiPer HR receivers you can select Bluetooth, Serial Cable and WiFi connection.

    Note: Topcon Legacy selection will work with all receiver models which were manufactured before GR-3 receiver.

  2. From the Receiver Model list, select the model of the base receiver you are using and enter its Serial Number.

  3. Set Elevation Mask. Usually the default 13 degrees is appropriate. Data from satellites below this elevation will not be used.
  4. From RTK Format list, select the format for the differential corrections data, which the base radio will transmit. RTCM MSM format is supported in Topcon GNSS receivers with firmware version 4.5 and later. This format allows you to create the correction data with measurements of GPS, GLONASS and BeiDou satellite systems.
  5. From the Antenna drop-down list, select the type of the base receiver antenna used.
  6. Enter the antenna height and set the type of height measurement (vertical or slant). To do this, click the Antenna Height button and select Edit from the drop-down menu. The Antenna Setup dialog is opened. Here you can edit the antenna type, the value of the antenna height, and the type of height.

    Note: The antenna height for a base receiver should not exceed the RTK protocol limits:
    • For RTCM 3.x - 6.5535m Mark-to-ARP.
    • For RTCM 2.3 - 26.2144m Mark-to-ARP.
    • For RTCM 2.1/2.2 - 26.2144m Mark-to-L1PC.
    • For CMR - 8.192m Mark-to-L1PC.

  7. If needed to transmit data from different ports of the base receiver to several rovers, you need activate the Multiple Ports option. To do this, click the Peripherals button. The Peripherals dialog is opened. Here you can select the number of ports to use for base output.
  8. Optionally, you can turn off the charger mode for the receiver's internal battery if it is available. To do this, select the Receiver Setting option from the pop-up menu that displays by clicking in the top left corner.
  9. Click Next. The wizard will open the corresponding screen to create the RTK configuration.