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GPS and RTK Module Setup ​

TIP

LGC Ground Station configures GPS and RTK modules graphically. Click the GPS/RTK icon and follow the on-screen steps. The module position slider sets the GPS offset, and the Positioning module 2 slider configures GPS2.

  • Connect LGC Ground Station to the controller.
  • Open UAV Setup > Positioning module.

  • If the GPS/RTK antenna is not mounted at the centre of gravity, turn Module position off from the centre and enter the offset from the centre of gravity.

TIP

A wrong GPS offset makes the aircraft drift off the spot when it yaws in place instead of turning about its own axis. If you have GPS2 as a redundant unit, click Positioning module 2 to enable it.

  • Click Next and wire the hardware as shown in the diagram.

  • Click Finish and restart the controller as prompted.

Dual-antenna position and heading ​

When GPS1 is a C-RTK 9Ps and GPS2 is a C-RTK 9Ps on UART4, the system shows the heading source settings.

Changing the positioning settings ​

To change the GPS settings after setup, click Modify in the top left corner first.

RTK base station setup ​

If you are using a C-RTK series module, you can add an RTK base station for centimetre-level positioning.

  • Open LGC Ground Station, click the LGC icon, then App Settings > General. Scroll the right-hand pane down to the RTK GPS section.

  • Choose to run a Survey In.
  • Set the survey accuracy to 3–3.5 m and the minimum observation time to 60 s.
  • Restart LGC Ground Station.

TIP

Survey accuracy here is the single-point convergence accuracy of the base station, not the accuracy after RTK fixing. 3–3.5 m is a reasonable balance between environment and speed — at that setting the rover still resolves to centimetre accuracy. If the base station is already configured, skip all of this and go to the next step.

  • Connect the RTK base station, raise the antenna and set it up outdoors with a clear sky view.
  • LGC detects the base station and starts convergence. The RTK icon turns red and shows the current accuracy and satellite information.

  • Once the accuracy meets the threshold and the observation time is up, the RTK icon turns white.

  • When a vehicle or aircraft carrying an RTK rover is connected, LGC forwards the base station's RTCM corrections to the rover through the controller for differential solving.

  • The rover receives the RTCM data, solves it and enters RTK status. (RTK Fixed gives the highest accuracy.)

NTRIP / network RTK base / CORS ​

LGC supports network RTK (CORS/NTRIP). Click the CORS icon in the top right of the main screen to see RTK status; click it again to open the NTRIP settings.

  • Buy a network RTK (CORS) account (Qianxun, China Mobile and similar providers).
  • Make sure LGC Ground Station has internet access (computer or phone online).
  • Select ntrip as the protocol.
  • Enter the IP and account details from the provider. The controller uses WGS84, so set the port to 8002.
  • Enter the account and password to fetch the mount points, then pick one.
  • Check the base station information on the left — once data arrives, the setup works.

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For a network RTK base, LGC has to know where the vehicle or aircraft is before it can pick the nearest base station. Without a position fix you cannot get RTK service.