METHOD FOR SIGNALLING COVERAGE OF ROADS INTERSECTION Russian patent published in 2017 - IPC G08B25/10 

FIELD: security systems.

SUBSTANCE: invention relates to methods for remote area security monitoring and can be used in cases of application of detection means (DM) with an extended detection area (EDA) built on radio beam or infrared principles of detection for signalling coverage of four-way road intersections. Method involves deploying on the intersection of two DM in such a way, that distances from the intersection center to the points of the EDA crossing the road relate as 1:3:9:27 and points "1" and "3" and points "3" and "9" lie on requiring unambiguous determination two straight mutually reverse and two rotary mutually reverse directions, respectively, the EDA of the first DM passes through points "1" and "9", of the second DM passes through points of "3" and "27"; issuing a DM alarm signal at an intruder getting in its EDA and automatic switching over to the standby mode when the intruder leaves the EDA; further determining the intruder movement direction by a sequence of two different or two identical numbers of DM outputting the signal and a delay time interval between their arrival taking into account the possible range of the intruder speeds on the given terrain and distances between the EDA at these directions of movement. Method includes a preparatory step for deploying two DM according to the developed scheme and the main step, which begins from the moment the intruder appearance on the intersection and his crossing the detection area of one of the DM. During the main step the intruder direction of movement is determined by an algorithm taking into account the recorded sequence of numbers of DM outputting the alarm signal, the time interval of a delay between the arrival of signals, the range of possible speeds of the intruder on the given terrain and the distance between the EDA by the roads.

EFFECT: thus, it becomes possible to increase the accuracy of indicating the most important directions of an intruder movement (these four directions are determined unambiguously) without increasing the DM number and without reducing the accuracy of indicating other directions (remaining eight directions are determined in pairs).

1 cl, 9 dwg