Check survey device sensors

During an indoor positioning system (IPS) survey, a device records Bluetooth Low Energy (BLE) radio signals from the environment. Simultaneously, motion unit sensors provide additional input that is used to optimize position estimations. The sensors must be calibrated for optimal performance. A built-in sensor check displays a warning if one or more sensors are not calibrated or if the required permissions are not granted.

Use the Sensors section in the user profile to verify the app permissions and the status of Bluetooth, location, compass, gyroscope, and accelerometer sensors. To access the Sensors section, tap Profile at the top of the map list.

Verify app permissions

To verify app permissions, complete the following steps:

1. Tap Profile .

   The status of the sensors is displayed in the Sensors section.

2. Ensure that the following permissions are enabled:
   • Location
   • Precise Location
   • Compass Calibration
   • Bluetooth
   • Heading Accuracy

Verify heading accuracy

Heading accuracy refers to the deviation between the reported heading and the true geomagnetic heading, measured in degrees. A positive value between 0 and 35 indicates an accurate heading, and a negative value indicates an inaccurate heading.

To verify heading accuracy and calibrate your device's compass, complete the following steps:

1. Open ArcGIS IPS Setup and sign in if necessary.
2. Tap Profile or the Sensor Check bar if it is displayed on the map screen.

   The Sensors section appears.

3. Tap Heading Accuracy and follow the prompts to calibrate the compass if the accuracy value is less than 0 or greater than 35.

   If the Heading Accuracy value is between 0 and 35, no calibration is necessary.

The compass is now calibrated.

Note:

Interference from local magnetic fields may result in Heading Accuracy values of less than 0 or greater than 35. If this is the case, move to a location away from potential sources of interference, or calibrate the device outdoors where there is a strong enough GPS signal for a successful calibration.

You can calibrate the compass at any time without accessing the Sensor Check list.

The Sensor Check bar is displayed in yellow if the accuracy of the compass is below the minimum accepted threshold. Regardless of the compass accuracy, you can still test the ArcGIS IPS performance in Map mode.

The performance of a deployment may be negatively affected if the compass sensor is not calibrated. To perform surveys, the device's sensors must be calibrated.