Abstract An aircraft instrument landing system for use on an aircraft runway to guide approaching aircraft along a glide path comprising in combination first and second directional transmitters to be disposed on the left and right sides of a runway for transmitting radio signals which will overlap including a high frequency oscillator complex for supplying a high frequency output carrier signal from each transmitter and modulator means for each transmitter supplying a pair of different identifiable modulation signals for each transmitter. Each transmitter defines a "reference plane" which is inclined to the horizontal in such a manner that the intersection of the two reference planes defines a desired glide path. Receiver means on the aircraft are disposed to receive said carrier signals and including narrow band pass filter means for separating the four identifiable modulation signals, detector means coupled to said filter means including resistor divider means to adjust the intensity of said signals and means to add and subtract the received signals, and, display means coupled to said detector means and including indicator means visibly indicating the position of the aircraft relative to a phantom glide slope reference plane, a phantom azimuth reference plane and visibly showing the signal displacement from said planes, and means to control the angle of the phantom glide slope reference plane at the receiver in the aircraft.
Inventors
👤 Rudolf Clemens Hergenrother
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 11:31
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
An aircraft instrument landing system for use on an aircraft runway to guide approaching aircraft along a glide path comprising in combination: a. first and second directional transmitters to be disposed on the left and right sides of a runway for transmitting directional radio signals in two reference planes at angles to the horizontal which will intersect to define a glide path including a high frequency oscillator complex for supplying a high frequency output carrier signal from each transmitter and modulator means for each transmitter supplying a pair of modulation signals for each transmitter which are different and identifiable; b. receiver means on the aircraft disposed to receive said carrier signals and including narrow band pass filter means for separating the four identifiable modulation signals; c. detector means coupled to said filter means including resistor divider means to adjust the intensity of said signals and means to add and subtract the received signals; and, d. display means coupled to said detector means and resistor divider means including indicator means visibly showing the position of the aircraft relative to a phantom glide slope reference plane, azimuth reference plane and visibly showing the signal displacement from said planes.
Claim 2
Dependent Claim
196 words
An aircraft instrument landing system for use on an aircraft runway to guide approaching aircraft along a glide path comprising in combination: a. first and second directional transmitters to be disposed on the left and right sides of a runway for transmitting directional radio signals in two reference planes at angles to the horizontal which will intersect to define a glide path including a high frequency oscillator complex for supplying a high frequency output carrier signal from each transmitter and modulator means for each transmitter supplying a pair of modulation signals for each transmitter which are different and identifiable; b. receiver means on the aircraft disposed to receive said carrier signals and including narrow band pass filter means for separating the four identifiable modulation signals; c. detector means coupled to said filter means including resistor divider means to adjust the intensity of said signals and means to add and subtract the received signals; and, d. display means coupled to said detector means and resistor divider means including indicator means visibly showing the position of the aircraft relative to a phantom glide slope reference plane, azimuth reference plane and visibly showing the signal displacement from said planes.
Claim 3
Dependent Claim
21 words
A system as claimed in claim 1 wherein said transmitters include microwave horn transmitters and said oscillator supplies a microwave signal.
Claim 4
Dependent Claim
30 words
A system as claimed in claim 2 wherein said transmitters each include at least two microwave horn antennas and said modulator means includes one modulator for each microwave horn antenna.
Claim 5
Dependent Claim
62 words
A system as claimed in claim 5 including pilot controlled means coupled to said receiver means for modifying the D.C. output signals in such a manner as to shift the phantom guide slope reference plane and additional pilot controlled means coupled to said receiver means modifying the D.C. output signals in such a manner as to shift the phantom azimuth reference plane.
Claim 6
Dependent Claim
131 words
A system as claimed in claim 1, said display means having first and second detectors with a D.C. output including sum and difference means for combining the D.C. output signals from these detectors and also with two indicators in said display means coupled to said sum and difference means and responsive thereto, one indicator being an azimuth course deviation indicator, the other indicator being a glide slope deviation indicator, said indicators being so coupled that the azimuth course deviation indicator responds to the difference of the D.C. output signals to indicate position of the receiver relative to a "phantom" azimuth reference plane and the glide slope deviation indicator responds to the sum of these D.C. signals to indicate the position of the receiver relative to a "phantom" glide slope reference plane.