System for monitoring airport equipments utilizing power-line carrier
First Claim
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1. A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:
- a plurality of terminals connected in series to a power line derived from a fixed current generator, for monitoring individually said airport facilities via a rubber transformer; and
a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using a power-line carrier of said power line based on a signal from said higher order system and the monitoring signal to said host station using the power-line carrier of said power line, wherein each of said host station and said terminals comprises;
zero cross detection means for detecting the zero cross of power source waveform of said power line;
a data processing calculation control section for creating a control command for respective terminals and a monitoring signal of the airport facilities as text data; and
signal insertion means for inserting said text data into said power line by a predetermined modulation based on the zero cross detected by said zero cross detection means, and wherein said host station comprises means for creating a first text data based on said control command, and inserting the text data into said power line by using zero crosses of a plurality of cycles of said power source waveform; and
said respective terminals comprise means for creating second text data, which is a monitoring signal of the airport facilities, each of said terminal being allocated to each cycle of said power source waveform, and for inserting said second text data into said power line using the zero cross of a predetermined cycle of said power source waveform, after the reception of said first text data power line carried from said host station, when a communication between said host station and said plurality of terminals is to be performed.
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Abstract
A power-line carrier airport facilities monitor system, comprising a host station and respective terminal for monitoring individually the object facilities via a rubber transformer are connected in series to a power line derived from a fixed current generator, wherein the host station and respective terminal create a control command for respective terminal/monitoring signal of the object facilities as text data and, on the other hand, injections said text data to the power line by FSK modulation based on the zero cross detection of the power line power source waveform.
11 Citations
11 Claims
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1. A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:
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a plurality of terminals connected in series to a power line derived from a fixed current generator, for monitoring individually said airport facilities via a rubber transformer; and
a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using a power-line carrier of said power line based on a signal from said higher order system and the monitoring signal to said host station using the power-line carrier of said power line, wherein each of said host station and said terminals comprises;
zero cross detection means for detecting the zero cross of power source waveform of said power line;
a data processing calculation control section for creating a control command for respective terminals and a monitoring signal of the airport facilities as text data; and
signal insertion means for inserting said text data into said power line by a predetermined modulation based on the zero cross detected by said zero cross detection means, and wherein said host station comprises means for creating a first text data based on said control command, and inserting the text data into said power line by using zero crosses of a plurality of cycles of said power source waveform; and
said respective terminals comprise means for creating second text data, which is a monitoring signal of the airport facilities, each of said terminal being allocated to each cycle of said power source waveform, and for inserting said second text data into said power line using the zero cross of a predetermined cycle of said power source waveform, after the reception of said first text data power line carried from said host station, when a communication between said host station and said plurality of terminals is to be performed.- View Dependent Claims (2, 3, 4, 5)
the host station has a display element connected via a current transformer to a bypass filter provided between power lines derived from said fixed current generator, and the status of said bypass filter is monitored by the display status of this display element.
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4. The power-line carrier airport facilities monitor system according to claim 1 or claim 2, wherein:
said respective terminal is provided with a power accumulation element for accumulating power of the power source section used at least for the lamp, and the power accumulated in this a power accumulation element is used at least during the signal injection by said signal injection means.
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5. The power line carrier airport facilities monitor system according to claim 1, wherein said signal insertion means comprises means for inserting said text data into said power line when a predetermined time has elapsed in the same cycle, after the zero cross detection by said zero cross detection means.
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6. A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:
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a plurality of terminals connected in series to a power line derived from a fixed current generator, for monitoring individual said airport facilities via a rubber transformer are connected in series to a power line derived from a fixed current generator;
a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using the power-line carrier of said power line based on a signal from said higher order system the monitoring signal to said host station using power-line carrier of said power line;
a filter apparatus comprising a resonance circuit resonating with the frequency used for said power-line carrier is provided on the output side power line of said fixed current generator, such that noise generated from said fixed current generator and signal of the frequency used for said power-line carrier between said host station and each terminal are respectively separated, wherein said filter apparatus comprises compensation reactance elements for increasing respectively said host station/respective terminal side impedance, installed at the power line primary said positioned at said host station/respective terminal side in said resonance circuit, in order lower the attenuation slope of the frequency used for the power-line carrier due to phasing or standing wave. - View Dependent Claims (7, 8, 9)
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10. A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:
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a plurality of terminals connected in series to a power line derived from fixed current generator, for monitoring individually said airport facilities via a rubber transformer;
a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using a power-line carrier of said power line based on a signal from said higher order system and the monitoring signal to said host station using the power-line carrier of said power line; and
a filter apparatus comprising a resonance circuit resonating with the frequency used for said power-line carrier provided on the output side power line of said fixed current generator, such that noise generated from said fixed current generator and signal of the frequency used for said power-line carrier between said host station and each terminal are respectively separated, said terminal being provided with a power charging capacitor for charging power to the output side of a power line modem out of a signal injection period, when a signal is injected into said power line from the power line modem through a signal injection reactance, and a switching element for short-circuiting and signal injection reactance during said out of signal injection period, in order to increase the transmission power using said charged power during signal injection.
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11. A system for monitoring and controlling airport facilities having at least one of a plurality of lamps, said system comprising:
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a plurality of terminals connected in series to a power line derived from a fixed current generator for monitoring individually said airport facilities via a rubber transformer;
a host station connected to a higher order system of said airport facilities, for transmitting control signals to each of said terminals using power-line carrier of said power line based on a signal from said higher order system and the monitoring signal to said host station using power-line carrier of said power line; and
a filter apparatus comprising a resonance circuit resonating with the frequency used for said power-line carrier provided on the output side power line of said fixed current generator, such that noise generated from said fixed current generator and signal of the frequency used for said power-line carrier between said host station and each terminal are respectively separated, said switching element connects in said signal injection reactance before a predetermined time of the power source waveform to inject a signal, in order to avoid generation of over voltage by the signal injection reactance.
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Specification