Determining positions of devices

1. A system comprising:

a processor; and

a non-transitory storage medium storing instructions executable on the processor to:

when the instructions determine that a first accuracy of a determined position of a device comprising a position sensor exceeds an accuracy threshold at a first time:

select, from a plurality of different power control profiles based on the first accuracy, a first power control profile, the different power control profiles corresponding to different accuracies in device positioning, and each power control profile of the different power control profiles specifying a respective periodicity of activation of the position sensor to acquire position data;

send the first power control profile over a network to the device;

receive a first plurality of instances of position data and associated first accuracy metadata acquired by the position sensor at a first non-zero periodicity specified by the first power control profile; and

determine a position of the device based on combining the first plurality of instances of position data and the associated first accuracy metadata;

when the instructions determine that a second accuracy of a determined position of the device is less than the accuracy threshold at a second time:

select, from the plurality of different power control profiles based on the second accuracy, a second power control profile;

send the second power control profile over the network to the device;

receive a second plurality of instances of position data and associated second accuracy metadata acquired by the position sensor at a second non-zero periodicity specified by the second power control profile, the second non-zero periodicity being different from the first non-zero periodicity; and

determine a position of the device based on combining the second plurality of instances of position data and the associated second accuracy metadata.

2. The system of claim 1 , wherein the first plurality of instances of position data and the associated first accuracy metadata are acquired by the position sensor in a lower power state.

3. The system of claim 2 , wherein the position sensor in the lower power state is to acquire the first plurality of instances of position data and the associated first accuracy metadata at a plurality of time points according to the first non-zero periodicity specified by the first power control profile, and the position sensor is deactivated between successive time points of the plurality of time points.

4. The system of claim 3 , wherein a time interval between the successive time points of the plurality of time points exceeds an hour according to the first non-zero periodicity specified by the first power control profile.

5. The system of claim 1 , wherein the first plurality of instances of position data and the associated first accuracy metadata are acquired by the position sensor located in an area where signals to the position sensor are blocked or degraded.

6. The system of claim 1 , wherein the instructions are executable on the processor to use a Kalman filter to combine the first plurality of instances of position data and the associated first accuracy metadata.

7. The system of claim 1 , wherein the instructions are executable on the processor to use a weighted averaging technique to combine the first plurality of instances of position data and the associated first accuracy metadata.

8. The system of claim 1 , wherein the first accuracy metadata comprises at least one metric selected from among horizontal accuracy, three-dimensional (3D) accuracy, horizontal dilution of precision (HDOP), vertical dilution of precision (VDOP), position dilution of precision (PDOP), time dilution of precision (TDOP), and geometric dilution of precision (GDOP).

9. The system of claim 1 , wherein the device comprises a moveable platform, and wherein the first plurality of instances of position data and the associated first accuracy metadata were acquired by the position sensor while the moveable platform is stationary.

10. The system of claim 1 , wherein the device comprises a moveable platform, and wherein the first plurality of instances of position data and the associated first accuracy metadata were acquired by the position sensor while the moveable platform is moving.

11. The system of claim 1 , wherein the instructions are executable on the processor to:

receive, from an application executing in a user device, configuration information relating to a configuration for determining a location of the device using the position sensor.

12. The system of claim 11 , wherein the instructions are executable on the processor to:

send, to the application executing in the user device, the determined position of the device based on combining the first plurality of instances of position data and the associated first accuracy metadata.

13. The system of claim 1 , wherein the system is separate from the device, and wherein the first plurality of instances of position data and the associated first accuracy metadata are received from the device over the network by the system.

14. A method performed by a system comprising a hardware processor, comprising:

when the system determines that a first accuracy of a determined position of a device comprising a position sensor exceeds an accuracy threshold at a first time:

selecting, from a plurality of different power control profiles based on the first accuracy, a first power control profile, the different power control profiles corresponding to different accuracies in device positioning, and each power control profile of the different power control profiles specifying a respective periodicity of activation of the position sensor to acquire position data;

sending the first power control profile over a network to the device;

receiving, over the network, a first plurality of instances of position data and associated first accuracy metadata acquired by the position sensor at a first non-zero periodicity specified by the first power control profile; and

determining a position of the device based on combining the first plurality of instances of position data and the associated first accuracy metadata;

when the system determines that a second accuracy of a determined position of the device is less than the accuracy threshold at a second time:

selecting, from the plurality of different power control profiles based on the second accuracy, a second power control profile;

sending the second power control profile over the network to the device;

receiving a second plurality of instances of position data and associated second accuracy metadata acquired by the position sensor at a second, non-zero periodicity specified by the second power control profile, the second non-zero periodicity being different from the first non-zero periodicity; and

determining a position of the device based on combining the second plurality of instances of position data and the associated second accuracy metadata.

15. The method of claim 14 , wherein the first plurality of instances of position data and the associated first accuracy metadata are acquired by the position sensor in a lower power state, wherein the position sensor in the lower power state acquires the first plurality of instances of position data and the associated first accuracy metadata at a plurality of time points according to the first non-zero periodicity specified by the first power control profile, and the position sensor is deactivated between successive time points of the plurality of time points.

16. A non-transitory machine-readable storage medium storing instructions that upon execution cause a system to:

when the instructions determine that a first accuracy of a determined position of a device comprising a position sensor exceeds an accuracy threshold at a first time:

select, from a plurality of different power control profiles based on the first accuracy, a first power control profile, the different power control profiles corresponding to different accuracies in device positioning, and each power control profile of the different power control profiles specifying a respective periodicity of activation of the position sensor to acquire position data;

send the first power control profile over a network to the device;

receive a first plurality of instances of position data and associated first accuracy metadata acquired by the position sensor at a first non-zero periodicity specified by the first power control profile; and

determine a position of the device based on combining the first plurality of instances of position data and the associated first accuracy metadata;

when the instructions determine that a second accuracy of a determined position of the device is less than the accuracy threshold at a second time:

select, from the plurality of different power control profiles based on the second accuracy, a second power control profile;

send the second power control profile over the network to the device;

receive a second plurality of instances of position data and associated second accuracy metadata acquired by the position sensor at a second, non-zero periodicity specified by the second power control profile, the second non-zero periodicity being different from the first non-zero periodicity; and

determine a position of the device based on combining the second plurality of instances of position data and the associated second accuracy metadata.

17. The non-transitory machine-readable storage medium of claim 16 , wherein the instructions upon execution cause the system to use a Kalman filter to combine the first plurality of instances of position data and the associated first accuracy metadata.

18. The non-transitory machine-readable storage medium of claim 16 , wherein the instructions upon execution cause the system to use a weighted averaging technique to combine the first plurality of instances of position data and the associated first accuracy metadata.

19. The non-transitory machine-readable storage medium of claim 16 , wherein the device comprises a moveable platform, and wherein the first plurality of instances of position data and associated first accuracy metadata were acquired by the position sensor while the moveable platform is stationary.