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Calibration of the UAV sensors

You should re-calibrate Stribog UAV any time there's a change in hardware, location, or environmental conditions, or if the drone behaves unexpectedly.

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Calibration info

This guide explains how to calibrate the Stribog UAV's sensors — specifically the compass, accelerometer, and gyroscope.

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You don’t always need to calibrate every sensor during a calibration session.

  • Compass Calibration: Perform compass calibration if drone’s heading doesn’t match the actual direction it's facing, if it drifts off course, or if it behaves unpredictably. An incorrectly calibrated compass is often the main cause of erratic UAV flight behavior.

  • Accelerometer Calibration: Calibrate accelerometer if compass calibration didn’t resolve the issue and the UAV is still flying unpredictably.

  • Gyroscope Calibration: The gyro is usually calibrated automatically at startup. However, after a crash or hard impact, it’s a good idea to manually recalibrate the gyroscope along with the other sensors to ensure stable flight.

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After calibration/s always reboot drone by powering it down, not only autopilot via QGroundControl

1

Calibration Setup

Calibration Setup

  1. Turn off the Doodle Labs radio (wearable).

  2. Turn on the Stribog UAV.

  3. Turn on the Getac notebook.

  4. Open QGroundControl-x86_64.AppImage on the Getac notebook by double-clicking the app.\

  5. Connect the Stribog and Getac using a Micro USB to USB-A data cable.

  6. After a few seconds, the status in the top left corner of QGroundControl should change from Disconnected (Connection Lost) to Not Ready or Ready. This indicates that the Stribog autopilot is connected.\

  7. After a few seconds, the status in the top left corner of QGroundControl should change from Disconnected (Connection Lost) to Not Ready or Ready. This indicates that the Stribog autopilot is connected.\

  8. Click on the logo in the top left corner.

  9. A menu will pop up. Select Vehicle Configuration.\

  10. On the right panel, click on the Sensors tab.

  11. From this page, you can calibrate sensors such as the compass, accelerometer, and gyro. Each calibration process is described in detail below.

2

Compass Calibration

Compass Calibration

  1. Click on the Compass tab. Do not change any settings in the pop-up window.

  2. Click OK to begin calibration.

  3. Calibration: Randomly rotate the drone along each axis(roll, pitch, yaw) until the calibration bar fills up.

  4. If calibration is not successful, an error message will appear: Calibration failed. Repeat the process if this happens.\

  5. If successful, a Calibration complete window will appear. It will also show a calibration quality indicator — aim for the green region. You can always redo the calibration if needed.\

3

Accelerometer Calibration

Accelerometer Calibration

  1. Click on the Accelerometer tab.

  2. Click OK to start calibration. Do not change any settings in this tab.\

  3. Click OK to start calibration. Do not change any settings in this tab.\

  4. Follow the pictograms: hold the Stribog UAV in the specified orientation. Hold the UAV still, while pressing Next button.\

  5. When each pictogram's bezel turns green, that axis is calibrated. Continue until all are complete.

4

Gyro Calibration

Gyro Calibration

  1. Place the Stribog UAV on a flat surface and leave it completely still.

  2. Click on the Gyro tab.

  3. Click OK to calibrate. The process should complete within a second.

5

After Calibration

After Calibration

  1. Unplug the Micro USB cable from the PC and the Stribog.

  2. Close QGroundControl-x86_64.AppImage.

  3. Turn on the Doodle Labs radio.

  4. Restart the Stribog by holding the power button until the arm LEDs turn off. Then turn it on again by pressing the power button.

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