MR/LR kit hookup guide

Unboxing the kit:

Take a few minutes to open the box and understand the elements of your kit:

  • 2x simpleRTK2B boards (one base & one rover, check the bottom of the board)
  • 2x GPS/GNSS Dual Band Antennas
  • (only in the LR kit) 2x Radio Link Antennas
Note that you will need a USB cable to power the boards. You can take any microUSB you have at home, together with its wall plug.

Setting up the base:

Start with the simpleRTK2B board labeled as “BASE”.

Do not power the board until the installation is finished. Because once the board is powered, it is very important to not move the GPS/GNSS antenna nor obstruct its visibility from the sky.

That being said, take the BASE unit and its antennas and install them in a fixed location with line of sight to the the area where the other unit will move around.

The top of a barn roof is a good place to install the base station

Once the installation is done, you are ready to power the board:

You can connect to “XBEE+POWER” if you are an advanced GPS user and would like to check the base station parameters by connecting the “GPS+POWER” to your PC.

The BASE unit comes pre-configured so that once your power it up, it calculates its absolute position with an accuracy of 2.5meters.
This process takes around 10 minutes.

Once this is finished, the unit will start sending corrections so that the rover can start calculating its relative position within centimeters.
You will also notice that the LED “GPS>XBEE” will increase its activity.

If high relative accuracy is not enough for you, and you need high absolute accuracy, you have 2 options:

  • You can re-configure the base, to calculate its position with better absolute accuracy.
    You can use the message UBX-CFG-TMODE3 for that.
    You can monitor the status of this calculation with message UBX-TIM-SVIN.
    The better absolute accuracy you want, the longer it will take to calculate it.
    To give you an idea, it can take 24h to achieve decimeter accuracy.
  • If you know the exact position of the base station, you can also set it directly.

While you wait, you can start setting up the rover.

Setting up the rover:

Take the other simpleRTK2B board labeled as “ROVER”.

Get a microUSB cable and connect it to the USB labeled as “GPS+POWER”.
Connect the other end to your preferred mobile phone, tablet, or PC.

If you are using a Windows PC, don’t forget to install the USB driver before connecting it for the first time to the PC.
The driver is available here: https://www.u-blox.com/en/product-resources/2673The.
Make sure you only install the “VCP” (Virtual COM Port) variant.

Once you power the board, start monitoring the LEDs:

  • simpleRTK2B is powered: “POWER” LED will indicate that the board is powered.
  • simpleRTK2B is receiving data from the base unit: Monitor “XBEE>GPS” LED to confirm.
  • With good view of the sky, it will take 20-40 seconds until “GPS FIX” LED starts blinking: once it blinks once per second it means you have the first position fix.
  • To know if the position fix is with standard accuracy or RTK accuracy, you can monitor “RTK FIX” LED: blinking when receiving RTCM data, OFF when RTK fix
We know this LED codes for FIX and RTK are not ideal, but they are the default u-blox configuration.

Ready to go:

Now you are ready to start enjoying high precision.

During the first minutes, we recommend that you check regularly the LEDs for RTK FIX to be sure that everything is working OK.

If you want to achieve the best range for the radio link, we recommend you to have a look at our XBee antenna installation guide.