Apparatus and method for reviewing path of travel
First Claim
1. A system for reviewing the travel of an object or a person, comprising:
- (a) single, radio frequency transmitting means disposed at a fixed, predetermined geographical location to broadcast a signal containing first information identifying said location; and
(b) radio frequency receiving means to be carried by said object or person, having memory means and real time clock means, to receive said broadcast signal, means for detecting a broadcast range of said transmitting means based on a carrier frequency of said broadcast signal, when said object or person is within the broadcast range of said transmitting means, and to store said first information in said memory means together with the current times and dates from said real time clock means, when said object or person enters and leaves said broadcast range, for later readout of said first information with said times and dates to determine the interval of time said object or person was in said broadcast range.
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Accused Products
Abstract
In a preferred embodiment, a plurality of battery-operated radio frequency transmitters that are located throughout a travel route, which transmitters periodically broadcast location numbers, each transmitter having a location number uniquely identifying that transmitter and its location. A radio frequency receiver is located in the object or on the person being monitored. When the receiver detects the carrier frequency of a transmitter, it activates a microprocessor which stores in memory the identification number of that transmitter and the date and time when the number was received. This is repeated within the broadcast range of each transmitter. When the receiver is taken to a home base, the memory is unloaded and the travel route that was taken can be determined together with the times the various check points were passed. The transmitted signal may also include a message that the state of charge of the transmitter battery is low.
36 Citations
17 Claims
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1. A system for reviewing the travel of an object or a person, comprising:
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(a) single, radio frequency transmitting means disposed at a fixed, predetermined geographical location to broadcast a signal containing first information identifying said location; and (b) radio frequency receiving means to be carried by said object or person, having memory means and real time clock means, to receive said broadcast signal, means for detecting a broadcast range of said transmitting means based on a carrier frequency of said broadcast signal, when said object or person is within the broadcast range of said transmitting means, and to store said first information in said memory means together with the current times and dates from said real time clock means, when said object or person enters and leaves said broadcast range, for later readout of said first information with said times and dates to determine the interval of time said object or person was in said broadcast range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for reviewing the travel of an object or a person, comprising:
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(a) broadcasting at a single, predetermined, fixed, geographical location a radio frequency signal containing first information identifying said location; (b) detecting a broadcast range of said radio frequency signal based on a carrier frequency of said radio frequency signal, and (c) receiving at said object or person said radio frequency signal and storing said first information in memory means together with the current times and dates, when said object or person enters and leaves the broadcast range, for later readout of said first information with said times and dates to determine the interval of time said object or person was in said broadcast range. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification