High confidence isolated presence detection in fine resolution region

A method that includes determining likelihood of presence of a radio presence-advertising signal (PA-signal, also PAS) emitter within a predetermined fine resolution region of interest, the method comprising:

• receiving at two or more co-located directional antennas, radio PA-signals repeatedly broadcast from the radio PAS emitter and relaying the received signals to one or more respective radio receivers used for the co-located directional antennas, the co-located directional antennas being directed to cover the predetermined fine resolution region of interest;
• in the respective one or more radio receivers, determining corresponding strengths of the radio PA-signals that were received at a substantially same time by two or more of the co-located directional antennas;
• generating from the determined strengths, a current strength difference signal for at least one pair of the two or more respective radio PA-signals that were received at a substantially same time by two or more of the co-located directional antennas, the generated current strength difference signal indicating a difference between a first of the determined corresponding strengths, that is optionally weighted, and a second of the determined corresponding strengths, that is optionally weighted;
• and
• using the generated current strength difference signal to generate a confidence signal that indicates the likelihood of presence of the radio PAS emitter within the predetermined fine resolution region of interest, wherein the confidence signal is generated based on an antenna favoring factor and empirically picked constants.

A machine system that is responsive to a likelihood that a radio PAS emitter is present within a predetermined fine resolution region of interest, the system comprising:

• two or more co-located directional antennas structured to receive radio PA-signals repeatedly broadcast from the radio PAS emitter and to relay the received signals to one or more respective radio receivers used for demodulating the received signals, the co-located directional antennas being directed to cover the predetermined fine resolution region of interest;
• respective signal strength measuring circuits in the respective one or more radio receivers, the measuring circuits structured to determine corresponding strengths of the radio PA-signals that were received at a substantially same time by two or more of the co-located directional antennas;
• a first generator structured to generate from the determined strengths, a current strength difference signal for at least one pair of the two or more respective radio PA-signals that were received at a substantially same time by two or more of the co-located directional antennas, the generated current strength difference signal indicating a difference between a first of the determined corresponding strengths, that is optionally weighted, and a second of the determined corresponding strengths, that is optionally weighted;
• and
• a second generator structured to use the generated current strength difference signal to generate a confidence signal that indicates the likelihood of presence of the radio PAS emitter within the predetermined fine resolution region of interest, wherein the confidence signal is generated based on an antenna favoring factor and empirically picked constants.

A computer system comprising one or more processors and a memory having collectively stored therein instructions that, when executed by the one or more processors, cause the one or more processors to determine a likelihood of presence of a radio presence-advertising signal emitter (PAS emitter) within a predetermined fine resolution region of interest, the executed instructions comprising:

• obtaining from a respective one or more radio receivers, strength data representing corresponding strengths of the radio presence-advertising signals (PA-signals) that were received at a substantially same time by two or more of co-located directional antennas, the received radio PA-signals being those repeatedly broadcast from the radio PAS emitter and relayed to the one or more respective radio receivers that are operatively coupled to the co-located directional antennas, the co-located directional antennas being directed to cover the predetermined fine resolution region of interest;
• generating from the determined strengths, a current strength difference signal for at least one pair of the two or more respective radio PA-signals that were received at a substantially same time by two or more of the co-located directional antennas, the generated current strength difference signal indicating a difference between a first of the determined corresponding strengths, that is optionally weighted, and a second of the determined corresponding strengths, that is optionally weighted;
• and
• generating a confidence signal based on the generated current strength difference signal, the confidence signal indicating the likelihood of presence of the radio PAS emitter being within the predetermined fine resolution region of interest, wherein the confidence signal is generated based on an antenna favoring factor and empirically picked constants.