How to set up your UNI using radio

Why would you use radio?

As you might know, the UNI can be used as either a rover or a base station. The rover receives the data, processes it and provides you with an accurate location in the field. The base station is set on a fixed position and transmits correctional data to the rover in the field.

Normally, the base station emits the correctional data through a (mobile) dataconnection. This is a stable and reliable method to emit and receive the correctional data. However, in some cases the mobile data connection might be limited or non-existing. This would mean that it’s not possible to receive the correctional data and therefor it is not possible to get an accurate position. In this scenario, sending the correctional data through radio frequencies is the solution to still be able to work with an accurate location.

Radio is not reliant on any form of connection other than its own and that of thereceiver and is therefor self-reliant. If you want to use the UNI with radio, you can find how to set it up below;

Setting up your basestation with radio

First of all, ensure that the UNI that will be used as a base station is set on a location with open view of the sky. This ensures that the UNI is able to accurately gather the information to pinpoint its location and send out the proper data. Second, radio is more limited to a direct line-of-sight with the receiver. The less obstruction is between the base station and rover, the easier it is to receive the information and the quicker you will get an accurate location.

1. While connected to the WiFi-networkof the UNI which will be used as a base station, go to the UNI-Connect webpage (IP-address; 192.168.27.1)
2. Go to “Settings” and then “Location”, press “edit” and apply the following settings
   1. UNI-Mode: Static base
   2. Base station coordinates: Single Averaging
   3. Base coordinates options: Should remain on 30 minutes to gather a position
   4. Base output type: Radio
   5. Radio settings: Most can remain unchanged (see image 1)
      1. Frequency: 868.5 Mhz, the frequency at which the base emits the data
      2. Bandwidth: 250 khz, the amount of data send through the connection
      3. Spreadingfactor: 11, lowering decreases bitrate but increases the range
      4. Codingrate: 5, higher increases reliability, but decreases data rate
      5. Output power: 20 dBm, the maximum power possible with the UNI
      6. Preamblelength and Antenna gain are fixed on 8 and 0 respectively
   6. Output format: RTCM3 and MSM Type 4
   7. Advanced RTCM3
      1. Solely enable the following; (see image 2)
         1. 1006, 1074, 1084, 1094 and 1124 and set these to 1 Hertz
         2. 1033 and set this to 0.1 Hertz
      2. Lowering these increases the range but decreases the fix reliability and accuracy
   8. Finally, press “Save location setting”
3. Go to “Settings” and then “Advanced”and enter the following code: 022017
   1. Go to the “RTK/DGPS” tab
   2. If necessary change the RTK datatimeout to 20
   3. Press “save”
4. Your UNI is now ready to emit correctional data through radio!

Image 1

Image 2

Setting up your rover with radio

After setting up your base station, it’s time to set up your rover as well so you can start your measurements. Setting up the rover is very similar to the base station, however the rover does not need time to gather an accurate position beforehand. Ensure that the rover is set up with the exact same settings and output format options as the base station. In the default situation, as shown above, you can follow the following steps:

1. While connected to the WiFi-network of the UNI which will be used as a rover, go to the UNI-Connect webpage (IP-address; 192.168.27.1)
2. Go to “Settings” and then “Location”, press “edit” and apply the following settings
   1. UNI-Mode: Moving rover
   2. Position mode: Real-time kinematic
   3. Correction mode: Radio
   4. Radio settings: Most can remain unchanged (see image 1)
      1. Frequency:868.5 Mhz
      2. Bandwidth:250 khz
      3. Spreadingfactor: 11
      4. Coding rate: 5
      5. Outputpower: 20 dBm
      6. Preamblelength and Antenna gain are fixed on 8 and 0 respectively
   5. Output format: Bluetooth
   6. Outputformat options: NMEA
3. Finally, press “Save location setting”
4. Go to “Settings” and then “Advanced”and enter the following code: 022017
   1. Go to the “RTK/DGPS” tab
   2. If necessary change the RTK datatimeout to 20
   3. Press “save”
5. Your UNI is now ready to receive correctional data through radio!

You're ready to go!

Following these steps enables the ability to receive correctional data through radio. Ensuring you are able to measure nearly anywhere your heart desires. Whether you are in a remote location without any internet coverage or anywhere where a base station in not within reach! Happy measuring!