E$1\mathrm{.}13$ Consider the inverted P$1\mathrm{.}10$ The role of air traffic control systems is increasing as airplane traffic increases at busy airports. Engineers are developing air traffic control systems and collision avoidance systems using the Global Positioning System $($GPS$)$ navigation satellites $[34,55].$ GPS allows each aircraft to know its position in the airspace landing corridor very precisely. Sketch a block diagram depicting how an air traffic controller might use GPS for aircraft collision avoidance.