A method for identifying and monitoring a plurality of individual vehicles which are congregated together in a given area and locating an individual vehicle in the plurality of vehicles, comprising the steps of;
- providing a central monitoring unit having a programmable microprocessor and CPU with memory storage means, data input means, and display means operatively connected through associated circuitry with RF transceiver means operable for transmitting RF polling signals and RF vehicle locate signals and receiving RF response signals and RF low battery signals through the atmosphere, the operation of said microprocessor and CPU controlled by software programs to transmit and receive said signals in response to instructions inputted by a user and in response to received RF signals;
- installing an individual programmable RF transponder unit on each individual vehicle respectively and connecting it with the battery of the respective vehicle to provide a primary source of electrical power thereto;
- assigning an identification number to each said individual RF transponder unit such that each identification number identifies a particular RF transponder unit;
- storing the identification number of each said particular RF transponder unit and the corresponding identity of each said respective individual vehicle on which it is installed in said central monitoring unit memory storage means;
- each said individual RF transponder unit having a programmable microprocessor with memory storage means interfaced through associated circuitry With RF transceiver means for receiving RF inventory palling signals and RF vehicle locate signals and transmitting RF response signals and RF low batter signals through the atmosphere in response to RF signals received from said central monitoring unit;
- each said individual RF transponder unit having an auxiliary power supply, battery voltage sensor means operable to sense the voltage of the battery of the respective individual vehicle in which it is installed and to produce a sensor signal upon sensing a predetermined low voltage condition of said battery, and associated circuitry connected with its said microprocessor, its said RF transceiver means, its said battery voltage sensor means, and its said auxiliary power supply for supplying power from said auxiliary power supply to its said RF transceiver means upon receiving said sensor signal;
- each said individual RF transponder unit having alarm means and associated circuitry interfaced with its said microprocessor and its said RF transceiver means for producing a perceivable alarm responsive to receiving an RF vehicle locate signal transmitted from said central monitoring unit;
- programming said microprocessor of each said individual RF transponder unit to cause its said RF transceiver means to transmit an RF response signal upon receiving an RF inventory polling signal;
- inputting data to instruct said central monitoring unit RF transceiver means to sequentially transmit an RF inventory polling signal to a said individual RF transponder unit and to wait for a predetermined time interval to receive an RF response signal transmitted from the corresponding individual RF transponder unit and to record which of said individual RF transponder units has transmitted its said RF response signal;
- recording the identity of the respective individual RF transponder units which have transmitted said RF response signal within said tie interval and the identity of the respective said individual vehicle on which it is installed and being in inventory, and recording the identity of the respective said individual RF transponder units which have not transmitted said RF response signal within said time interval and the identity of the respective said individual vehicle on which it is installed as being inactive or not in inventory;
- programming said microprocessor of each said individual RF transponder unit to cause its said RP transceiver means to transmit an RF low battery signal through the atmosphere in response to receiving said sensor signal from its said battery voltage sensor means;
- inputting data to instruct said central monitoring unit RF transceiver means to receive an RF low battery signal transmitted from an individual RF transponder unit;
- and
- recording the identification number of the individual RF transponder units that have transmitted its said RF low battery signal and the identity of the respective said individual vehicle on which it is installed;
- programming said microprocessor of each said individual RF transponder unit to cause its said RF transceiver means to receive an RF vehicle locate polling signal transmitted from said central monitoring unit, and to activate its said alarm means upon receiving said RF vehicle locate signal;
- inputting data to cause said central monitoring unit RF transceiver means to transmit an RF vehicle locate polling signal to a said individual RF transponder unit to cause said individual RP transponder unit to activate its said alarm means;
- whereby
- the respective said individual vehicle with on which said individual RF transponder unit is alarm means is activated may be easily located out of said plurality of individual vehicles which are congregated together in said given area.