Magnetic communication system comprised of at least one underground transceiver unit and one surface transceiver unit having common transmit and receive antennae for two-way, wireless, through-the-earth communications using advanced signal processing and optimized antenna design for mine safety and other applications, namely, emergency underground communications and location detection of trapped miners

'advanc':34 'antenna':22,39 'applic':46 'common':18 'communic':2,32,50 'compris':4 'design':40 'detect':53 'earth':31 'emerg':48 'least':7 'locat':52 'magnet':1 'mine':42 'miner':56 'name':47 'one':8,13 'optim':38 'process':36 'receiv':21 'safeti':43 'signal':35 'surfac':14 'system':3 'through-the-earth':28 'transceiv':10,15 'transmit':19 'trap':55 'two':25 'two-way':24 'underground':9,49 'unit':11,16 'use':33 'way':26 'wireless':27

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