an area surveillance system in accordance with claim 13, whereinġ5. An area surveillance system in accordance with claim 12, whereinġ4. An area surveillance system in accordance with claim 9, whereinġ3. An area surveillance system in accordance with claim 10, whereinġ2. An area surveillance system in accordance with claim 9, including means disposed aboard said mobile station for requesting permission of said traffic control center to engage in voice communication therewith.ġ1. An area surveillance system in accordance with claim 3, whereinġ0. An area surveillance system in accordance with claim 3, whereinĩ. An area surveillance system in accordance with claim 3, whereinĨ. An area surveillance system in accordance with claim 5, whereinħ. An area surveillance system in accordance with claim 3, whereinĦ. An area surveillance system in accordance with claim 3, whereinĥ. An area surveillance system in accordance with claim 2, whereinĤ. An area surveillance system in accordance with claim 1, includingģ. A unified area surveillance, communication and mobile station guidance system comprising a traffic control (TC) center having a plurality of reference stations associated therewith, the mobile station including means for transmitting calling pulses having a predetermined repetition period which pulses arrive and are received by said reference stations which information is then fed to said TC center to compute the position of and track said mobile station with respect thereto and to continuously track said calling pulses, said TC center thereafter causing the generation of an interrogation signal to said mobile station via transmissions generated from three of said reference stations at such times that said transmissions arrive only in the vicinity of said selected mobile station in an established interrogating pattern having an established time relationship with the aboard generated calling pulses to provide reliable mobile station selectivity, the reception of said interrogation signal enabling direct communication between said TC center and the aboard mobile station equipment to provide time-multiplexed voice communication and collision avoidance and mobile station guidance data which may be used for automatic operation of said mobile station, communication between the mobile station and the TC center is in digital form and in particular in binary coded decimal form to thereby provide said selected mobile station with collision avoidance, enroute navigation and approach data which data may be directly displayed on a digital display aboard said mobile station without any conversion of the data.ġ.
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