Patent ID: 6127931
Filing Date: 2000-10-03
Classification: G08B

Abstract:
A device for monitoring the movement of a person, said device comprising:a) a homing unit including:i) means for independently generating a homing signal; andii) means for transmitting said homing signal at predetermined intervals;b) a base unit including:i) means for receiving said homing signal;ii) means for processing said homing signal to determine whether said homing unit is within a predetermined distance from said base unit and generating an alarm signal upon determining said homing unit is at a distance from said base unit greater than said predetermined distance, said processing means determining a time between receipt of the sequentially transmitted homing signals and strength of said signal to determine a distance between said base unit and said homing unit;iii) means for alerting a user that said homing unit has moved a distance greater than said predetermined distance from said base unit upon receipt of said alarm signal from said processing means;iv) means for adjusting said predetermined distance;v) means for adjusting a reference time period utilized by said processing means for determining said predetermined distance; andc) means in said homing unit for establishing the monitoring area by setting the strength of the homing signal.