System and methods of detecting human presence in the vicinity of a radio frequency receiver system

A system comprising:

• one or more processors;
• a display device;
• a passive antenna array focused to receive radio frequency signals reflected off of one or more surfaces within an area surrounding the passive antenna array;
• and
• a non-transitory machine-readable storage medium containing instructions, which when executed on the one or more processors, cause the one or more processors to perform operations including:
• receiving, at a first time, a first plurality of radio frequency signals, wherein the first plurality of radio frequency signals are received from one or more devices positioned within a same area as the passive antenna array;
• receiving, at a second time, a second plurality of radio frequency signals from the one or more devices;
• determining differences between characteristics of the first plurality of radio frequency signals and corresponding characteristics of the second plurality of radio frequency signals, wherein the characteristics of at least one first signal of the first plurality of radio frequency signals and the corresponding characteristics of at least one second signal of the second plurality of radio frequency signals include a phase angle and a distance value, and wherein the distance value is based on a first distance between the passive antenna array and a device of the one or more devices or a second distance between the passive antenna array and a surface off of which the at least one first signal or the at least one second signal are reflected;
• and
• generating an image of the area surrounding the passive antenna array using the differences.

A non-transitory machine-readable storage medium containing instructions, which when executed on one or more processors, cause the one or more processors to perform operations including:

• receiving, at a first time and by a passive antenna array, a first plurality of radio frequency signals, wherein the first plurality of radio frequency signals are received from one or more devices positioned within a same area as the passive antenna array, and wherein the passive antenna array is focused to receive radio frequency signals reflected off of one or more surfaces within an area surrounding the passive antenna array;
• receiving, at a second time, a second plurality of radio frequency signals from the one or more devices;
• determining differences in time between the first time and the second time;
• determining differences between characteristics of the first plurality of radio frequency signals and corresponding characteristics of the second plurality of radio frequency signals, wherein the characteristics of at least one first signal of the first plurality of radio frequency signals and the corresponding characteristics of at least one second signal of the second plurality of radio frequency signals include a phase angle and a distance value, and wherein the distance value is based on a first distance between the passive antenna array and a device of the one or more devices or a second distance between the passive antenna array and a surface off of which the at least one first signal or the at least one second signal are reflected;
• and
• generating an image of the area surrounding the passive antenna array using the differences.