Patent ID: 7414545

Claim:
An airport incursion collision avoidance system to avoid collisions in a restricted movement area that includes an airport runway, said restricted movement area being traversed by both airplanes and ground traffic vehicles that require clearance from an air traffic control tower before entering such restricted movement areas, comprising; a transmitter that generates a low-frequency warning signal, a controller coupled to said transmitter for switching said transmitter between an on-state and an off-state based on an operational state of said airport runway, an antenna in communication with said transmitter to transmit said warning signal into areas traversed by said vehicles approaching said restricted movement area when said transmitter is in said on-state, said antenna including an inductive cable buried in the ground, said inductive cable being at a known distance outside of said restricted movement area, said low-frequency warning signal being continuously radiated from said inductive cable during said on-state, and a receiver in each of said vehicles to receive said transmitted warning signals when said vehicle approaches one of said restricted movement areas, said receiver further including an advance warning alarm that is responsive to said warning signal to alert the vehicle operator of said restricted movement area before said vehicle enters said restricted movement area.