| 摘要 |
FIELD: radio engineering; rescue operations.SUBSTANCE: novel in method of searching affected under rubble is provision of whole mine personnel with beacons, and establishing of search group, which is equipped with radio beacons activation devices and search devices in amount of three pieces. Activation device drives variable-frequency magnetic field with one frequency and set power. This variable magnetic field is caught by mine personnel radio beacon and if radio beacon exceeds certain threshold level of this field, heart rate microwave sensor is actuated and low-frequency magnetic field is excited with another frequency. By movable coils with ferromagnetic cores of search devices that variable-frequency magnetic field is received, amplified electrical signals obtained at outputs of coils and supplied to level indicators. By rotating moving coils with electromagnetic cores maximum or minimum readings of level indicator are produced. At that, coils with ferromagnetic cores longitudinal axes turning angle is measured relative to certain known direction, for example, to the North of Earth's magnetic field. At known distances between themselves by search devices and known azimuths of search devices relative to each other and relative to certain known direction, for example, to North of Earth's magnetic field, by measured angles of rotation of longitudinal axes of coils with ferromagnetic cores in search devices, determining range and true azimuths of search object or beacon from each of search devices. Selecting these azimuth and distance to search object from that of search devices, from which rescue operations are carried out most efficiently.EFFECT: method of searching for injured people under rubble can be used to locate personnel under rubble in mines.1 cl |
