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公开(公告)号：EP0830659A1
公开(公告)日：1998-03-25
申请号：EP96920187.0
申请日：1996-05-13
CPC分类号： G08B25/016 , G08B21/02 , G08B25/007
摘要： A portable locator (10) disposed on a person can be set to continuously transmit an alarm signal. This alarm signal is a PN ORed with data and transmitted over a carrier frequency to a plurality of fixed receivers (14). The fixed receivers (14) determine from the time of arrival the proximate location of the locator (10). After a short time, the locator (10) switches from a high power mode sufficient to reach each of the receivers (14) into a low power mode to conserve the battery. A portable monitor (62) with two receivers (66, 68) and two antennas (70, 72) operating on an angle of arrival method is moved into the general location of the locator (10) to further refine and determine the exact location of the locator (10).
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