Passive infrared sensor system for position detection

A PIR sensor system, comprising:

• a first PIR sensor associated with a first sensing region, the first PIR sensor comprising a first sensing element configured to sense heat radiation from a first group of zones of the first sensing region and a second sensing element, which is distinct from the first sensing element, configured to sense heat radiation from a second group of zones of the first sensing region, wherein at least one zone of the first group of zones is associated with one of the first and second sensing elements and at least one zone of the second group of zones, adjacent to the at least one zone of the first group of zones, is associated with the other one of the first and second sensing elements;
• a second PIR sensor associated with a second sensing region, the second PIR sensor comprising a third sensing element configured to sense heat radiation from a first group of zones of the second sensing region and a fourth sensing element, which is distinct from the third sensing element, configured to sense heat radiation from a second group of zones of the second sensing region, wherein at least one zone of the first group of zones of the second region is associated with one of the third and fourth sensing elements and at least one zone of the second group of zones of the second region, adjacent to the at least one zone of the first group of zones, is associated with the other one of the third and fourth sensing elements;
• wherein the first and second sensing regions partially overlap such that an overlapped zone of the first sensing region overlapping a zone of the second sensing region defines a plurality of detection cells and a non-overlapped zone defines another detection cell;
• wherein the sensor system is configured to represent each detection cell with a predetermined amplitude and a predetermined sign of a first output signal based on input signals from the first and second sensing elements of the first PIR sensor and with a predetermined amplitude and a predetermined sign of a second output signal based on input signals from the third and fourth sensing elements of the second PIR sensor, each predetermined amplitude determined by a distance from the detection cell to the first and second PIR sensors, and each predetermined sign determined by a wiring between input of the sensing element associated with the zone and a differential electronic component, the PIR sensor system further comprising:
• a processing unit configured to associate the amplitude and sign of the first output signal and the amplitude and sign of the second output signal with one of the detection cells to determine a position of a heat source within the first and second sensing regions;
• and
• a calibration unit configured to determine a configuration of the first and second sensing regions based on the first and second output signals by analyzing a configuration of the first and second output signals generated in response to a motion of an installer along a predefined pattern.