| 摘要 |
A mine rescue system for locating trapped miners following a mine disaster. A transmitting device deployed by the trapped miners transmits a signal at a frequency below 3 kHz. The phase of the signal received on the surface is measured with respect to the signal received at an arbitrary reference point and the position on the surface is found where the phase lead is maximized over the reference thus locating the point below which the miners are trapped. The system may be extended to provide for two-way communications between the surface and the mine. Also, the invention encompasses means to guide a rescue drill bit.
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