System for monitoring airport equipments utilizing power-line carrier

• US 20010038345A1
• Filed: 01/25/2001
• Published: 11/08/2001
• Est. Priority Date: 01/27/2000
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Gotoh, Hidenori, Satoh, Takakazu
• Granted Patent: US 6,437,686 B2
• Time in Patent Office: Days
• US Class Current: 340/947
• CPC Class Codes: B64F 1/18 Visual or acoustic landing aids taxiing aids B64F1/002
• CPC Class Codes: B64F 1/36 Other airport installations ground installations for de-icing aircraft B64F5/20
• CPC Class Codes: H05B 47/185 via power line carrier transmission
• CPC Class Codes: H05B 47/235 with communication between the lamps and a central unit

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.

Claims

1. An power-line carrier airport facilities monitor system, wherein a host station connected to a higher order system and respective terminal for monitoring individually the airport facilities via a rubber transformer are connected in series to a power line derived from a fixed current generator, said host station transmits control signal to said respective terminal using power-line carrier based on a signal from said higher order system, and said respective terminal transmits the monitoring signal to said host station using power-line carrier, wherein said host station and terminal comprise;

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 terminal/monitoring signal of the object facilities as text data; and

signal insert means for inserting said text data to said power line by FSK modulation based on the zero cross detected by said zero cross detection means.

3. The power-line carrier airport facilities monitor system according to

claim 1

or

claim 2

, wherein:

said host station comprises means for creating several bytes of text data based on said control command, and inserting said text data into said power line by using zero crosses of a plurality of cycles of said power source waveform; and

said respective terminal comprises means for creating 1-byte text data, which is monitoring signal of the concerned object equipment, one terminal being allocated to each cycle of said power source waveform, and for inserting said text data into said power line using the zero cross of a predetermined cycle of said power source waveform, after the reception of text data power-line carried from said host station,

when a communication of said host station;

terminal station=1;

n is to be performed.

4. The power-line carrier airport facilities monitor system according to

claim 1

or

claim 2

, wherein:

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.

5. 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.

2. An power-line carrier airport facilities monitor system, wherein a host station connected to a higher order system and respective terminal for monitoring individually the airport facilities via a rubber transformer are connected in series to a power line derived from a fixed current generator, said host station transmits control signal to said respective terminal using power-line carrier based on a signal from said higher order system, and said respective terminal transmits the monitoring signal to said host station using power-line carrier, wherein:

said host station and terminal comprise;

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 terminal/monitoring signal of the object facilities as text data; and

signal insert 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.

6. A monitoring control system, wherein a host station and respective terminal for monitoring and controlling the object to be monitored respectively via a rubber transformer are connected in series to a power line derived from a fixed current generator, said host station transmits control signal to said respective terminal using power-line carrier, and said respective terminal controls said facilities to be monitored upon reception of said control signal and, on the other hand, transmits the monitoring signal of the facilities to be monitored to said host station using power-line carrier, wherein:

a filter apparatus comprising a LC 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, and 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.

7. The power-line carrier facilities monitor system according to

claim 6

, wherein said filter apparatus comprises compensation reactance elements for increasing respectively said host station/respective terminal side impedance, installed at the power line primary side positioned at said host station/respective terminal side than said LC resonance circuit, in order to lower the attenuation slope of the frequency used for power-line carrier due to phasing or standing wave.

8. The power-line carrier facilities monitor system according to

claim 6

, wherein said host stations comprises a plurality of signal extraction sensors installed at the power line primary side positioned at said host station/respective terminal side than said LC resonance circuit in said bypass filter apparatus, in order to taking in as reception signal the signal extraction sensor side extraction signal presenting a higher reception level.

9. The power-line carrier facilities monitor system according to

claim 6

, wherein an additional rubber transformer is connected to said power line on this side of a specific terminal presenting a deeper depression of reception level, among terminals connected to said power line, in order to avoid the reception level depression at said specific terminal.

10. The power-line carrier facilities monitor system according to

claim 6

, wherein an additional rubber transformer is connected to said power line on this side of a specific terminal presenting a deeper depression of reception level, among terminals connected to said power line, and a resonance circuit resonating with the frequency used for the power-line carrier at the secondary side of the connected additional rubber transformer, in order to avoid the reception level depression at said specific terminal.

11. The power-line carrier facilities monitor system according to

claim 6

, wherein said terminal is provided with a power charging capacitor for charging power to the output side of the power line modem out of signal injection period, when signal is injected to said power line from the power line modem through a signal injection reactance, and a switching element for short-circuiting said signal injection reactance during said non signal injection period, in order to increase the transmission power using said charged power during signal injection.

12. The power-line carrier facilities monitor system according to

claim 11

, wherein said switching element connects said signal injection reactance before a predetermined time of the power source waveform to inject signal, in order to avoid the generation of overvoltage by the signal injection reactance.