Dual power security location system

Details Dual power security location system Dual power security location system

1995-05-16

1997-01-21

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340573, 342126, 342146, G08B 2512

Patent

active

055963137

ABSTRACT:
A security system is provided wherein a portable locator (10) is disposed on a protected person and, with the use of an alarm switch (88), an individual can set the locator (10) to continuously transmit an alarm signal. This alarm signal is comprised of a pseudonoise (PN) code ORed with data and transmitted over a carrier frequency. This carrier frequency is then transmitted to a plurality of fixed receivers (14). The fixed receivers (14) note the time of arrival and then determine via this time of arrival the approximate location of the locator (10). During this time, the locator (10) operates in a high power mode that is sufficient to reach each of the receivers (14). This occurs for a short time and then the locator (10) goes into a low power mode to conserve the battery. During this low power mode, a portable monitor (62) is provided that has two receivers (66) and (68). Two antennas (70) and (72) are associated therewith. The system operates on an angle of arrival method. This basically gives left-right direction to the portable monitor (62). The portable monitor (62) 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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