House arrest monitoring system with improved tamper detection
First Claim
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1. An electronic monitor for attachment to a subject being monitored wherein a tampering of the monitor is detected and a tamper condition is indicated, said monitor comprising:
- a) a strap terminating in first and second connectors, said strap containing a plurality of conductors each having a first end and a second end, said conductors extending between said first and second connectors;
b) a module having first and second engaging means for receiving the first and second connectors respectively, said strap and module being attached to the subject;
c) a transmitter contained within said module for generating a monitor signal, said transmitter indicating a tamper condition when the strap and module are disconnected;
d) means for applying a voltage to the first end of selected conductors in the strap to establish a voltage pattern at the second ends of said plurality of conductors;
e) means for monitoring the voltage pattern at the second ends to determine a change in voltage pattern causing the transmitter upon detection of a change to indicate a tamper condition.
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Abstract
A house arrest monitoring system wherein a transmitter module is attached to the subject by a strap containing a number of conductors. The module includes a microprocessor which applies a voltage to selected conductors and establishes a voltage pattern on the conductors. Any detected change in the pattern causes the generation of a tamper signal. The system is set for monitoring by an optical signal to prevent unauthorized resetting following a tamper condition.
63 Citations
21 Claims
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1. An electronic monitor for attachment to a subject being monitored wherein a tampering of the monitor is detected and a tamper condition is indicated, said monitor comprising:
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a) a strap terminating in first and second connectors, said strap containing a plurality of conductors each having a first end and a second end, said conductors extending between said first and second connectors; b) a module having first and second engaging means for receiving the first and second connectors respectively, said strap and module being attached to the subject; c) a transmitter contained within said module for generating a monitor signal, said transmitter indicating a tamper condition when the strap and module are disconnected; d) means for applying a voltage to the first end of selected conductors in the strap to establish a voltage pattern at the second ends of said plurality of conductors; e) means for monitoring the voltage pattern at the second ends to determine a change in voltage pattern causing the transmitter upon detection of a change to indicate a tamper condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting tampering of an electronic monitoring system attached to a subject being monitored which comprises the following steps:
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a) providing a securing strap having opposing ends for electrical connection to an electronics module containing a transmitter, the strap containing a plurality of conductors therein; b) securing the electronics module to the subject by attaching the module to the securing strap; c) applying a voltage at an end of the strap to selected conductors in said plurality of conductors to establish a voltage pattern at the opposing end of the strap; d) monitoring the voltage pattern at the opposing end and detecting a change in said pattern, the detection of a change indicating tampering with the monitoring system. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A tamper condition detection circuit for detecting an unauthorized removal of a transmitter module from a monitored subject, said circuit comprising:
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a) an encircling strap terminating in first and second electrical connectors; b) a plurality of individual conductors embedded in said strap and extending between said first and second electrical connectors, and c) a transmitter module for receiving the first and second electrical connectors which includes; i. first means for establishing a voltage pattern at the first electrical connector for the individual conductors; ii. second means for sensing the voltage pattern on the plurality of conductors at the second electrical connector, and iii. third means for detecting a variation between the voltage patterns present at the first and second connectors, said variation indicating the presence of a tamper condition. - View Dependent Claims (20, 21)
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Specification