Systems and methods for the selection of antennas in aircraft navigation systems
An aircraft, antenna technology, applied to antennas suitable for movable objects, directional diversity systems using radio waves, navigation through velocity/acceleration measurements, etc., to solve problems such as not always being optimally oriented
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example 1
[0048] Example 1 includes a navigation receiver system for an aircraft comprising a first aircraft antenna receiving a transmitter signal from a fixed location ground transmitter and a second aircraft antenna receiving a transmitter signal from the fixed location ground transmitter , wherein the first aircraft antenna has a first gain pattern different from a second gain pattern of the second aircraft antenna; a switch coupled to the first receiver and to the first aircraft antenna and the the second aircraft antenna; and a switch controller coupled to the switch, wherein the switch controller is based on whether the first gain pattern or the second gain pattern is at the fixed location ground transmitter A determination of higher gain is provided in the direction of a first fixed-position ground transmitter in the receiver, operating the switch to electrically couple the first receiver to either the first aircraft antenna or the second aircraft antenna.
example 2
[0049] Example 2 includes the system of example 1, wherein the determination of whether the first gain pattern or the second gain pattern provides higher gain in the direction of the first fixed location ground transmitter is Based on an orientation of the aircraft relative to the first fixed-position ground transmitter as determined at least in part from position information of the aircraft and altitude information of the aircraft.
example 3
[0050] Example 3 includes any of Examples 1-2 above, further comprising: a global navigation satellite system (GNSS) that outputs position information for the aircraft; and an inertial reference system that outputs altitude information for the aircraft.
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