System and method for animal location tracking and health monitoring using long range RFID and temperature monitoring

The invention includes a location tracking device in an RFID environment, a system and method for tracking tag objects. Preferred embodiments include location tracking for livestock and a system and method for categorizing animal health. The location tracking device is an active or passive RFID device having a low power, long range transceiver for tracking the location and movement of the tag animal. The RFID device further includes a temperature reader circuit that induces an activation voltage on an inductive coupled temperature sensor having an LC circuit. The activation voltage is selectively cycled on and off to measure the decay of the LC circuit by its resonant frequency. Changes in capacitance of the LC circuit are converted to temperature readings thereby providing temperature monitoring of the animal. The system and method includes logic in the form of predetermined movement categories which indicate whether an animal may be potentially sick or healthy. The movement categories include frequency of movement and distances traveled by a monitored animal.