Patent ID: 7450029

Claim:
An airport incursion collision avoidance system to assist with avoiding collisions in a restricted movement area traversed by both airplanes and ground traffic vehicles that require clearance from an air traffic control tower before entering said restricted movement area, comprising: a transmitter that generates a low-frequency warning signal having a frequency in the range from about 3 kHz to about 30 kHz, a cable that is coupled to said transmitter and buried at a distance outside of a perimeter said restricted movement area traversed by both airplanes and ground traffic vehicles that include vehicles that require clearance from an air traffic control tower before entering said restricted movement area, said cable radiating said warning signal a receiver in each of said vehicles, each of said receivers receiving said radiated warning signal in response to said respective vehicle passing over said buried cable and before said respective vehicle passes into said restricted movement area, an alarm in each of said vehicles producing an advance warning in response to receipt of said warning signal by said receiver to alert a vehicle operator of said restricted movement area.