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. Using six fixed coils with ferromagnetic cores of three search devices (two in each) this variable-frequency magnetic field is received, amplified obtained at output of coils electrical signals and rectified them, then rectified signals are squared and added by pairs from each of search devices. At that, longitudinal axes of two coils in each of search devices are arranged perpendicular to each other. After that, from resultant signal square root is extracted to measure level of received signal, which corresponds to received alternating low-frequency magnetic field maximum value. Distance from each of search devices to radio beacon is determined by measured signal levels with help of previously captured nomogramm. At known distances between search devices and known azimuths of search devices themselves relative to each other, azimuths of beacon or search object from each of search devices are determined. 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.
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