Signal strength determination and mobile device identification monitoring system

A mobile device calibration system comprising one or more processors and one or more computer storage media storing instructions that when executed by the one or more processors, cause the one or more processors to:

• receive, from a particular mobile device, information indicating that it is to be carried around a perimeter of an area, the information specifying a broadcast identifier associated with the particular mobile device;
• obtain, from one or more wireless receivers monitoring communications associated with the specified broadcast identifier, information indicating signal strengths associated with monitored wireless communications;
• determine locations associated with the particular mobile device based on the obtained information and information indicating locations of the one or more wireless receivers;
• and
• determine, based on information indicating locations of the one or more wireless receivers, signal strengths associated with a plurality of locations included in the perimeter of the area, the signal strengths usable to associate signal strengths associated with mobile devices and locations of the mobile devices.

An indoor mapping system in communication with at least three active beacons, the system comprising one or more processors and one or more computer storage media storing instructions that when executed by the one or more processors, cause the one or more processors to:

• monitor, from information received from the active beacons, signal strengths of wireless communications being provided by one or more mobile devices located in a particular area;
• determine, based on the monitor signal strengths, respective locations of the one or more mobile devices over a time period;
• compare the determined locations with historical locations of other mobile devices in the particular area;
• and
• determine, based on the comparisons, locations within the particular area in which mobile devices can be located.

A crowd-sourced audience measurement system, said system comprising:

• a memory;
• a mobile device including processor and suitable wireless communications hardware configured to:
• identify a second mobile device in proximity via its wireless transmissions;
• store a unique identifier and the signal strength of wireless transmissions from second mobile device in memory;
• transfer unique identifier and signal strength data, including the present location of the mobile device, to a remote computer system;
• and
• a remote computer system configured to:
• receive data from mobile device;
• convert second mobile device's unique identifier into at least one demographic attribute;
• and
• assign the demographic attribute to the location.