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Patent No. 6014080 Body worn active and passive tracking device (Layson, Jr., Jan 11, 2000)
Abstract
Tamper resistant body-worn tracking device to be worn by offenders or potential victims for use in a wireless communication system receiving signals from a global positioning system (GPS). The tracking device directly communicates spacial coordinates to multiple remote sites. The tracking device is an enclosed case worn on a limb of a person. The case contains a battery, a signaling device, and a circuit board containing a field programmable gate array, a wireless data modem, a conventional GPS receiver, and a matched filtering GPS receiver.
Notes:
SUMMARY
OF THE INVENTION
The problem of implementing an all body worn active tracking device which is
small, lightweight and can be powered by rechargeable or replaceable rechargeable
batteries is solved by this invention. By employing significantly reduced power
consumption of subsystems required for active and passive body worn tracking,
the present invention produces an all body worn self rechargeable tracking device
using replaceable rechargeable batteries.
The high power consumption manner of determining the location, health and status
(i.e. performing a heartbeat function) of an active tracking apparatus by a
central data base system using connection oriented wireless service (i.e. a
cellular phone call) is solved by this invention using lower power consuming
connectionless oriented analog or digital wireless service.
By using very low power matching filter GPS receivers providing GPS almanac
data every hour by a connectionless oriented wireless message, the power required
to determine location using GPS receivers can be reduced by one to two orders
of magnitude.
Significant power and size reductions are achieved by integrating several integrated
circuit chip devices such as processor, memory, serial input/output, digital
input/output, etc. on a field programmable gate array (FPGA) versus implementing
discrete logic integrated circuits on a circuit board. Further power savings
of up to 35% are achieved by implementing all integrated circuits in low power
SOI versions of the integrated circuits.
This invention further provides an all body worn low power passive tracking
apparatus that when integrated with a wireless communications interface, transfers
the location movement history stored in the passive tracking apparatus to a
central data base system.
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Equivalent
elements can be substituted for the elements employed in this invention to obtain
substantially the same results in substantially the same way. Although the present
invention has been described in terms of the presently preferred embodiment,
it is to be understood that the disclosure is not to be interpreted as limiting.
Various alterations and modifications will no doubt become apparent to those
skilled in the art after having read the above disclosure. Accordingly, it is
intended that the appended claims be interpreted as covering all alterations
and modifications as fall within the true spirit and scope of the invention.