Techniques for improving ranging between electronic devices

1. A method of ranging via a wireless protocol with an electronic device by a mobile device, the method performed by the mobile device comprising:

receiving a plurality of timestamps, wherein the plurality of timestamps indicate receiving a first ranging packet at a first time, sending a response packet at a second time, and receiving a second ranging packet at a third time;

calculating a responder turn-around time using a first difference between the second time and the first time;

calculating a responding round trip time using a second difference between the second time and the third time;

receiving from the electronic device an initiator turn-around time and an initiator round trip time;

calculating a frequency offset between a first oscillator of the mobile device and a second oscillator of the electronic device using the responder turn-around time, the responding round trip time, the initiator turn-around time, and the initiator round trip time;

comparing an observed frequency offset to the calculated frequency offset to determine a frequency offset difference; and

when the frequency offset difference exceeds a threshold, adjusting a ranging measurement.

2. The method of claim 1 , wherein the observed frequency offset is determined from a measured signal of the wireless protocol of the electronic device.

3. The method of claim 1 , further comprising calculating a range between the electronic device and the mobile device using the responder round trip time and the initiator turn-around time.

4. The method of claim 1 , further comprising:

receiving, via the wireless protocol, an information packet comprising a first timestamp from the electronic device in a first ranging packet, the first timestamp indicating a first transmission time of the first ranging packet;

calculating a second timestamp indicating a second transmission time for the mobile device to transmit a response packet to the first ranging packet; and

sending, via the wireless protocol, the calculated second timestamp to the electronic device.

5. The method of claim 1 , wherein the adjusting the ranging measurement comprises applying a weighting to the ranging measurement based at least on the frequency offset difference.

6. The method of claim 1 , further comprising displaying a previously calculated ranging based at least on the frequency offset difference.

7. The method of claim 1 , further comprising calculating a direction to the electronic device based at least in part on received data packets.

8. A mobile device configured to perform ranging via a wireless protocol with an electronic device, comprising:

a memory comprising computer-executable instructions; and one or more processors in communication with the memory and configured to access the memory and execute the computer-executable instructions to perform operations comprising:

receiving a plurality of timestamps, wherein the plurality of timestamps indicate receiving a first ranging packet at a first time, sending a response packet at a second time, and receiving a second ranging packet at a third time;

calculating a responder turn-around time using a first difference between the second time and the first time;

calculating a responding round trip time using a second difference between the second time and the third time;

receiving from the electronic device an initiator turn-around time and an initiator round trip time;

calculating a frequency offset between a first oscillator of the mobile device and a second oscillator of the electronic device using the responder turn-around time, the responding round trip time, the initiator turn-around time, and the initiator round trip time;

comparing an observed frequency offset to the calculated frequency offset to determine a frequency offset difference; and

when the frequency offset difference exceeds a threshold, adjusting a ranging measurement.

9. The mobile device of claim 8 , wherein the observed frequency offset is determined from a measured signal of the wireless protocol of the electronic device.

10. The mobile device of claim 8 , wherein the operations further comprise calculating a range between the electronic device and the mobile device using the responder round trip time and the initiator turn-around time.

11. The mobile device of claim 8 , wherein the operations further comprise:

receiving, via the wireless protocol, an information packet comprising a first timestamp from the electronic device in a first ranging packet, the first timestamp indicating a first transmission time of the first ranging packet;

calculating a second timestamp indicating a second transmission time for the mobile device to transmit a response packet to the first ranging packet; and

sending, via the wireless protocol, the calculated second timestamp to the electronic device.

12. The mobile device of claim 8 , wherein the adjusting the ranging measurement comprises applying a weighting to the ranging measurement based at least on the frequency offset difference.

13. The mobile device of claim 8 , wherein the operations further comprise displaying a previously calculated ranging based at least on the frequency offset difference.

14. The mobile device of claim 8 , wherein the operations further comprise calculating a direction to the electronic device based at least in part on received data packets.

15. One or more non-transitory computer-readable storage mediums comprising computer-executable instructions that, when executed by one or more processors, cause the one or more processors of a mobile device to perform operations to perform ranging via a wireless protocol with an electronic device, the operations comprising:

receiving a plurality of timestamps, wherein the plurality of timestamps indicate receiving a first ranging packet at a first time, sending a response packet at a second time, and receiving a second ranging packet at a third time;

calculating a responder turn-around time using a first difference between the second time and the first time;

calculating a responding round trip time using a second difference between the second time and the third time;

receiving from the electronic device an initiator turn-around time and an initiator round trip time;

calculating a frequency offset between a first oscillator of the mobile device and a second oscillator of the electronic device using the responder turn-around time, the responding round trip time, the initiator turn-around time, and the initiator round trip time;

comparing an observed frequency offset to the calculated frequency offset to determine a frequency offset difference; and

when the frequency offset difference exceeds a threshold, adjusting a ranging measurement.

16. The one or more non-transitory computer-readable storage mediums of claim 15 , wherein the observed frequency offset is determined from a measured signal of the wireless protocol of the electronic device.

17. The one or more non-transitory computer-readable storage mediums of claim 15 , wherein the operations further comprise calculating a range between the electronic device and the mobile device using the responder round trip time and the initiator turn-around time.

18. The one or more non-transitory computer-readable storage mediums of claim 15 , wherein the operations further comprise:

receiving, via the wireless protocol, an information packet comprising a first timestamp from the electronic device in a first ranging packet, the first timestamp indicating a first transmission time of the first ranging packet;

calculating a second timestamp indicating a second transmission time for the mobile device to transmit a response packet to the first ranging packet; and

sending, via the wireless protocol, the calculated second timestamp to the electronic device.

19. The one or more non-transitory computer-readable storage mediums of claim 15 , wherein the adjusting the ranging measurement comprises applying a weighting to the ranging measurement based at least on the frequency offset difference.

20. The one or more non-transitory computer-readable storage mediums of claim 15 , wherein the operations further comprise displaying a previously calculated ranging based at least on the frequency offset difference.