Patent ID: 6472976
Filing Date: 2002-10-29
Classification: B60R,G08B

Abstract:
In a system including tags for monitoring at least one of the locating, identifying, counting or controlling animals and/or objects, repeaters and a center for maintaining, controlling and/or locating the animals and objects in time and space for the purpose of determining the locations, numbers rate of movement, if any, and projected movement rate or movement within monitored area, the improvement comprising:at least one tag comprising a transceiver, a microprocessor and, in permanent microprocessor memory, data representing the positions of the repeaters and center transmitter/receiver in and/or around the monitored area, and custom software having the functions necessary to calculate, from the elapsed time and change of phase between the signals transmitted to each of the at least one tag by the transmitter receiver and/or the repeaters, the position within the system of the at least on tag(s) and to implement the transmission of the calculated position of the at least on tag(s) to the transmitter/receiver and/or to the repeaters.