System of people search under avalanches in mines

Abstract

Some aspects of creation of a system for people search under rock obstruction and avalanches in mines are considered. The system design is based on use of a radio beacon. Rescue worker activates the beacon in a case of saving actions remotely. The operating distance of the system should be up to hundred meters. Taking into account the operating wave-length in 3 km, the proper operation of any antenna at such frequency and at such distance is impossible. The near-field zone must be considered. The antenna pattern is not formed in this zone and the loop antenna can not be used for the solving of classical task of navigation with the pattern minimum. The use of inductance coils for signal reception and signal transmitting is offered. In this case due to the mutual induction between the coils it is possible to establish the communication and it is possible to estimate the distance up to object of search. Rescue workers by means of searching devices determine the position of people under/behind the avalanches.