During an indoor positioning 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:
- Tap Profile .
The status of the sensors is displayed in the Sensors section.
- 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, while a negative value indicates an inaccurate heading.
To verify heading accuracy and calibrate your device's compass, complete the following steps:
- Open IPS Setup and sign in if necessary.
- Tap Profile or the Sensor Check bar if it is displayed on the map screen.
The Sensors section appears.
- 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 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. In such situations, move to a different location away from potential sources of interference or calibrate the device outdoors where there is 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.
Configure beacon UUID
Bluetooth scanning on iOS devices is limited to a single UUID value. Due to this limitation, you must specify the exact string to which the beacon network is configured. Type the beacon UUID value that your network is configured to, or leave the text box blank to accept the default UUID value. If the beacon network at your site contains multiple UUID values, you must perform separate surveys for each unique value.
Tip:
When working with custom network details, set the appropriate beacon configuration before starting the survey or the data may become invalid.
Path snapping
When preparing maps for performing surveys and positioning testing, you can create pathway features to enable path snapping functionality for your map. If pathways are configured for path snapping, the functionality is enabled by default. After the survey has been completed and the reference Indoor Positioning Data Service is configured for your map, positioning testing can be performed. Optionally, during the positioning testing, you can compare the location indicator accuracy with the path snapping feature enabled and disabled. You can enable and disable the feature by turning Path Snapping on or off in the profile menu.
To visualize the Pathways feature class, turn on Show Paths.