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Aircraft-rendezvous-using-low-data-rate-two-way-TACAN-bearing-information

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Aircraft rendezvous using low data rate two-way TACAN bearing information

Details

Inventors: Gilmour, John H.; Godleski, John S.; Carter, Randolph L.; Didier, Patrick F.;
Assignee: Rockwell International Corporation (El Segundo, CA)
Primary Examiner: Black; Thomas G.
Assistant Examiner: Auchterlonie; Thomas S.
Attorney, Agent or Firm: Murrah; M. Lee, Sewell; V. Lawrence, Hamann; H. Frederick

Aircraft rendezvous is facilitated by operating airborne remote aircraft TACAN stations in the inverse bearing mode and using low data rate range interrogation and range reply signals for determining bearing. An aircraft determines its bearing to another similarly equipped aircraft by switching its antenna to an omnidirectional pattern and transmitting range interrogation pulses and then switching its antenna to a rotating directional pattern and receiving range interrogation and range reply signals from the other aircraft. The TACAN station calculates the bearing to the other aircraft using the low data rate signals, thereby obviating the necessity of using a high power base TACAN station.

DETAILED DESCRIPTION With these and other objects in view, the present invention permits an aircraft to determine its bearing to a pulse navigation system base station solely from low data rate pulses such as those normally used in TACAN systems for range determinations.
The received data may be used to permit efficient rendezvous of two aircraft by means of antennas in both aircraft having selectable omnidirectional and rotating cardioid field strength patterns.
A first aircraft switches its antenna to the omnidirectional pattern and transmits a low data rate pulse train to the other aircraft.
The first aircraft then switches to the rotating cardioid pattern to receive pulses from the second aircraft.
The first aircraft operates similarly so that each aircraft can determine its bearing to the other.

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