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Compatible airborne navigation-air traffic control and collision avoidance system

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16. IN A RADIO NAVIGATION SYSTEM FOR A PLURALITY OF STATIONS IN WHICH A FIRST REFERENCE STATION TRANSMITS PERIODIC REFERENCE SIGNALS TO A NUMBER OF SECOND STATIONS AND EACH OF SAID SECOND STATIONS MAY DERIVE NAVIGATION DATA BY TRANSMITTING INTERROGATION SIGNALS TO SAID FIRST STATION AND RECEIVING REPLY SIGNALS THEREFROM, THE IMPROVEMENT COMPRISING AT EACH SECOND STATION: MEANS RESPONSIVE TO SAID PERIODIC REFERENCE SIGNALS FOR PRODUCING A PLURALITY OF FIRST SIGNALS BETWEEN TWO SUCCESSIVE PERIODIC REFERENCE SIGNALS AND HAVING A PREDETERMINED TIME RELATIONSHIP WITH RESPECT THERETO, SAID FIRST SIGNALS HAVING A PRE-ASSIGNED CODE OF POSITIONAL DATA IN ACCORDANCE WITH THE TIME OF OCCURRENCE BETWEEN SAID TWO SUCCESSIVE PERIODIC REFERENCE SIGNALS, AND MEANS FOR PRODUCING SAID INTERROGATION SIGNALS IN RESPONSE TO AND AT PREDETERMINED TIME RELATIONSHIPS WITH SELECTED ONES OF SAID FIRST SIGNALS TO INDICATE POSITIONAL DATA OF SAID SECOND STATION.
32. IN RADIO NAVIGATION SYSTEM FOR A PLURALITY OF MOBILE STATIONS WHICH TRANSMIT INTERROGATION SIGNALS AND WHICH OPERATE WITH A REFERENCE STATION WHICH TRANSMITS REFERNCE SIGNALS WHICH ARE RECEIVED BY THE MOBILE STATIONS, THE IMPROVEMENT AT EACH MOBILE STATION COMPRISING: MEANS RESPONSIVE TO THE REFERENCE SIGNALS RECEIVED FROM THE REFERENCE STATION FOR PRODUCING A PLURALITY OF INTERROGATION SIGNAL TRANSMISSION POSITIONS BETWEEN TWO SUCCESSIVE TRANSMITTED REFERENCE SIGNALS AND HAVING A PREDETERMINED TIME RELATIONSHIP THERETO, MEANS FOR MEASURING A POSITIONAL COORDINATE OF SAID MOBILE STATION WITH RESPECT TO A POSITIONAL DATUM, AND MEANS RESPONSIVE TO THE MEASURED POSITIONAL COORDINATE FOR PRODUCING THE INTERROGATION SIGNAL IN RESPONSE TO AND AT A PREDETERMINED TIME RELATIONSHIP WITH RESPECT TO SELECTED ONES OF SAID FIRST SIGNALS.
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