UPrecise application from Unicore
- Download, install, and run the configuration utility from Unicore (use Save As) UPRECISE-V2.0.1037
- Select English language with the button CH/EN in the top of the program screen
- Connect the UM980/UM982 board to the USB port of your PC. It will be recognized as a new COM port in the Dropbox of UPrecise.
- Press the "Connect" button at the bottom of the program screen to establish a connection.
Once connected, the data from the GNSS module will be displayed in the data stream box. You can pause the data stream to analyze past data or enter new configuration commands in the command line box. To send these commands to the GNSS module, press "Enter" on your PC keyboard. This functionality is useful for configuring the GNSS module for advanced applications or resetting it to its factory settings for normal GNSS usage.
For more details, check the UPrecise User Manual
Using UM982 module as Single Antenna GNSS for Base Station, providing RTCM data
The UM982 actually comes with this mode enabled. However, if it is connected to an autopilot, it will be reconfigured to provide normal GNSS data and moving baseline yaw data for the vehicle. To connect the UM982 GNSS to a PC running Mission Planner or QGC, use a USB cable. Using UPrecise, enter the following commands into the configuration command line, followed by pressing Enter on your keyboard:
- GPGGA COM1 1
- mode base time 60 2 2.5
- rtcm1006 com3 1
- rtcm1033 com3 1
- rtcm1074 com3 1
- rtcm1124 com3 1
- rtcm1084 com3 1
- rtcm1094 com3 1
- Saveconfig
This action will initiate a "survey-in" process to ascertain the GPS accuracy of the location. If no reconfiguration is carried out, the UM982 will restart the survey every time it is powered on. Upon completion of the survey, the UM982 will start transmitting RTCM correction data through the USB port.
In the mode command above:
- 60 is the time in seconds that all fixes obtained by the UM982 must remain within an area of horizontal and vertical precision in order for the survey to be declared complete.
- 2 is the horizontal precision in meters all fixes must be within to declare the survey complete.
- 2.5 is the vertical precision required of all fixes for completing the survey.
Reducing the precision settings will increase the total duration needed for the survey to be finished. If this approach is used on the bench, it may never finish or require extremely high precision values (i.e., less precise). Generally, the displayed values will provide precision at the decimeter level or better. Whenever the UM982 is power cycled or moved significantly (20 meters or more), this command should be reissued (followed by the saveconfig command) to initiate a new survey-in process for that particular location.
Now, let's shut it down or unplug it, and open the Mission Planner. In the Mission Planner's setup tab, select the RTK/GPS input option to establish a connection with the UM982. Connect it using the COM port to which the UM982 USB port is connected. Set the baud rate to 115200 and click on the connect button. Make sure that the ublox M8/F9P autoconfig checkbox is unchecked before establishing the connection.
After connecting to Mission Planner, the constellation checkboxes will become green, signifying the successful locking of satellites in the respective GNSS systems. Additionally, a bar graph displaying the strength of each constellation satellite will be presented, along with the location surveyed on a map.
Once the RTK data undergoes processing by the GNSS system of the vehicle, it's status will transition to "RTK float" and subsequently to "RTK fixed" on the ground control station's heads-up display (HUD), signifying its readiness for utilization. "RTK float" indicates the usage of correction data but has not yet reached the highest level of accuracy.
Resetting to factory configuration.
Using a configuration command line, enter the following commands precisely and press enter on your keyboard:
- FRESET
- GPGGA COM1 0.2
- GPRMC COM1 0.2
- AGRICA COM1 0.2
- config com1 230400
- saveconfig
© Eltehs SIA 2023
