Set Survey-in time & position accuracy limit

This step-by-step tutorial will let you to manually set the survey-in time and the position accuracy limit for the Base.

First, connect your GNSS device to a computer using a USB micro cable.

Now start the U-blox “u-center” software. Then on the top left corner of the screen, left-click on the reversed tiny black triangle to select the COM Port related to your GNSS device. (it may differs from COM7 as shown in pictures)

Make sure the connection icon is blinking in the bottom state bar. It indicates that the serial communication between the computer and the GNSS device is working.

Next go to ‘View’ then click on “Generation 9 Configuration View”

Survey-in time

A new window showing by default “GNSS Configuration” opens.

1. So first, click on “Advanced Configuration” to display all the configuration registers.

2. Then click on the small ‘+’ on the CFG-TPMODE line

3. You can now have access to an expanded menu and click on CFG-TPMODE-SVIN_MIN_DUR

4. Enter a valid position value in seconds (ex : a 60s value = 60)

5. Click consecutively on RAM, BBR and Flash to write changes into RAM and both non-volatile memories (BBR and Flash)

6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘Send’

Position accuracy limit

A new window showing by default “GNSS Configuration” opens.

1. So first, click on “Advanced Configuration” to display all the configuration registers.

2. Then click on the small ‘+’ on the CFG-TPMODE line

3. You can now have access to an expanded menu and click on CFG-TPMODE-SVIN_ACC_LIMIT

4. Enter a valid position value in millimeter with a 0.1mm scale (ex : a value of 1m = 10000 / a value of 3.2598m = 32598 / a value of 0.0054m = 54, etc... )

5. Click consecutively on RAM, BBR and Flash to write changes into RAM and both non-volatile memories (BBR and Flash)

6. Check the 3 corresponding commands are present in the “Ready to send” box and then click on ‘Send’

You have successfully set the Survey-in Time Duration and Position Accuracy limit !

Keep in mind the smaller the position accuracy is, the longer the RTK fix duration.