Airplane detection system
First Claim
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1. An airplane detection system comprising:
- wheel detection means including an energy transmission type sensor with a first pair of wave transmitter and wave receiver arranged on each side of a runway,said wheel detection means providing an output to indicate presence of an airplane when electromagnetic waves emitted from the wave transmitter of the first pair are blocked and energy received by the wave receiver of the first pair becomes lower than a first predetermined level;
fuselage detection means including a radar type energy reflection sensor with a second pair of wave transmitter and wave receiver arranged on the side of the runway wherein said wave transmitter of the wheel detection means is arranged,said fuselage detection means providing an output to indicate presence of the airplane when a reflection of electromagnetic waves emitted from the wave transmitter of the second pair is received by the wave receiver of the second pair and energy of the reflection received by the wave receiver of the second pair becomes higher than a second predetermined level; and
decision means for determining whether or not there is an airplane on the runway according to the output conditions of the wheel detection means and the fuselage detection means,wherein the decision means includes a nose wheel detected signal generator for generating a nose wheel detected signal according to the detection signals from the wheel detection means and fuselage detection means, a main wheel passage detected signal generator for generating a main wheel passage detected signal according to the detection signal from the fuselage detection means, and a self-hold circuit for generating and self-holding a decision signal to indicate the presence of an airplane upon receiving the nose wheel detected signal from the nose wheel detected signal generator and resetting the decision signal in response to the main wheel passage detected signal from the main wheel passage detected signal generator.
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Abstract
The present invention relates to an airplane detection system to surely detect an airplane moving along a runway or a taxiway. The system employs a wheel detection sensor for providing a wheel detected output when emitted electromagnetic waves are blocked by the wheels of the airplane and a fuselage detection sensor for providing a fuselage detected output when receiving the reflection of the emitted electromagnetic waves from the fuselage of the airplane. According to the output signals from both the sensors, the system detects the airplane.
23 Citations
8 Claims
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1. An airplane detection system comprising:
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wheel detection means including an energy transmission type sensor with a first pair of wave transmitter and wave receiver arranged on each side of a runway, said wheel detection means providing an output to indicate presence of an airplane when electromagnetic waves emitted from the wave transmitter of the first pair are blocked and energy received by the wave receiver of the first pair becomes lower than a first predetermined level; fuselage detection means including a radar type energy reflection sensor with a second pair of wave transmitter and wave receiver arranged on the side of the runway wherein said wave transmitter of the wheel detection means is arranged, said fuselage detection means providing an output to indicate presence of the airplane when a reflection of electromagnetic waves emitted from the wave transmitter of the second pair is received by the wave receiver of the second pair and energy of the reflection received by the wave receiver of the second pair becomes higher than a second predetermined level; and decision means for determining whether or not there is an airplane on the runway according to the output conditions of the wheel detection means and the fuselage detection means, wherein the decision means includes a nose wheel detected signal generator for generating a nose wheel detected signal according to the detection signals from the wheel detection means and fuselage detection means, a main wheel passage detected signal generator for generating a main wheel passage detected signal according to the detection signal from the fuselage detection means, and a self-hold circuit for generating and self-holding a decision signal to indicate the presence of an airplane upon receiving the nose wheel detected signal from the nose wheel detected signal generator and resetting the decision signal in response to the main wheel passage detected signal from the main wheel passage detected signal generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification