| 摘要 |
FIELD: rescue operations.SUBSTANCE: novel method of searching affected under rubble, is provision of whole personnel with mine 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 nine fixed coils with ferromagnetic cores three search devices (three 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 three from each of search devices. At that, longitudinal axes of three 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. At that, maximum level of received signal is provided at any position in space of search object beacon coil. 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 themselves and known azimuths of search devices 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 salvage measures are carried out most efficiently.EFFECT: disclosed is method of searching for injured people under rubble, taking into account arbitrary orientation of radio beacon antenna, method can be used to locate personnel under rubble in mines.1 cl |
