Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-01-18
2005-01-18
Zimmerman, Brian (Department: 2735)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S005270
Reexamination Certificate
active
06844816
ABSTRACT:
An Electronic House Arrest Monitoring (EHAM) system of the present invention includes a transmitter attached to a monitored offender and a receiver positioned in the vicinity of the desired monitoring location. The transmitter and the receiver each have a pattern stored or generated therein for determining the interval of time between signal transmissions and receptions. The pattern is pseudo-random to offer improved protection against imposter transmitters, in other words the time intervals are selected to be unequal and randomly varying but the pattern is repeated or cycled to allow continuing signal transmission by the transmitter. The transmitter transmits signals at varying time intervals according to this pattern, and the receiver authenticates signals it receives as coming from the monitored transmitter based on the expected time intervals from the pattern. The pattern may include any number of time intervals and, in one embodiment, includes more than one subpattern to extend the length of the repeat cycle to increase the difficulty of defeating the monitoring system. As further protection against imposter devices, the receiver may verify the signals based on information unique to the transmitter included in each signal. The receiver may further use the received signals and unique time interval patterns to determine a number of operating states, including New Transmitter ID Received, Transmitter In Range and Locked to Transmitter, Transmitter In Range and Not Locked, Transmitter Out of Range, and Imposter Likely. The monitoring system may also include a remote host computer linked to the receiver or receivers to enable these operating states to be monitored remotely by enforcement personnel.
REFERENCES:
patent: 4734680 (1988-03-01), Gehman et al.
patent: 4761778 (1988-08-01), Hui
patent: 4918432 (1990-04-01), Pauley et al.
patent: 4952913 (1990-08-01), Pauley et al.
patent: 4952928 (1990-08-01), Carroll et al.
patent: 4980671 (1990-12-01), McCurdy
patent: 4990892 (1991-02-01), Guest et al.
patent: 5023901 (1991-06-01), Sloan
patent: 5032823 (1991-07-01), Bower et al.
patent: 5117222 (1992-05-01), McCurdy et al.
patent: 5146207 (1992-09-01), Henry et al.
patent: 5182543 (1993-01-01), Siegel et al.
patent: 5189395 (1993-02-01), Mitchell
patent: 5204670 (1993-04-01), Stinton
patent: 5255306 (1993-10-01), Melton et al.
patent: 5266944 (1993-11-01), Carroll et al.
patent: 5369699 (1994-11-01), Page et al.
patent: 5383134 (1995-01-01), Wrzesinski
patent: 5537102 (1996-07-01), Pinnow
patent: 5627524 (1997-05-01), Fredrickson
patent: 5661458 (1997-08-01), Page et al.
patent: 5745037 (1998-04-01), Guthrie et al.
patent: 5898230 (1999-04-01), Bartel
patent: 5933098 (1999-08-01), Haxton
patent: 5959533 (1999-09-01), Layson, Jr. et al.
patent: 5969595 (1999-10-01), Schipper
patent: 6040770 (2000-03-01), Britton
patent: 0 344 138 (1989-11-01), None
patent: 0 575 753 (1993-12-01), None
patent: 2 186 404 (1987-08-01), None
“Code Hopping Encoder Product Brief,”Microchip HCS301,DS40136A, Microchip Technology Incorporated, Chandler, Arizona, 1996.
Melton Donald Alfred
Wilbur Todd James
BI Incorporated
Faegre & Benson LLP
Zimmerman Brian
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