Location measurement techniques

A mobile device, comprising:

• one or more processors;
• and
• a memory storing instructions that when executed by the one or more processors perform operations to:
• responsive to a trigger signal at an associated first time, generate a first location value using a first ranging session with one or more other devices;
• store the first location value in a memory;
• track, using a motion sensor of the mobile device, motion of the mobile device to determine a present location relative to the first location value;
• determine that a present location for the mobile device has changed by a threshold amount from the first location value since the associated first time;
• responsive to the present location for the mobile device having changed by more than a predetermined threshold amount since the associated first time, generate a second location value using a second ranging session with the one or more other devices;
• and
• store the second location value in the memory.

A non-transitory computer-readable medium storing instructions that when executed by one or more processors perform operations to:

• responsive to a trigger signal at an associated first time, generate a first location value using a first ranging session with one or more other devices;
• store the first location value in a memory;
• track, using a motion sensor of a mobile device, motion of the mobile device to determine a present location relative to the first location value;
• determine that a present location for the mobile device has changed by a threshold amount from the first location value since the associated first time;
• responsive to the present location for the mobile device having changed by more than a predetermined threshold amount since the associated first time, generate a second location value using a second ranging session with the one or more other devices;
• and
• store the second location value in the memory.