JPH027727A - Supervision control system on earth station for satellite communication - Google Patents

Abstract

PURPOSE:To eliminate the need for an equipment of the time division multiple access(TDMA) system or the like in the case of sending monitor control information and to make the device small in size by sending a monitor control information signal multiply onto a communication ordering line provided between stations. CONSTITUTION:A normal voice and an FSK wave to be sent with the addition of monitor control information are sent multiply on an ordering line used in the SCPC transmission and polling is applied to plural slave stations 3 in a control station 2 and a monitor controller receiving a signal from the slave station 3 is switched sequentially corresponding to the station of polling to attain the central control from the control station 2. Thus, the device applying monitor control in the TDMA system or the like is not required, the system is constituted inexpensively and the device is made small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an earth station monitoring and control system for satellite communication.

[Conventional technology]

Fig. 3 shows an example of a satellite communication system that monitors and controls an earth station in 5cpc transmission, where 1 is a communication satellite, 2 is a control station that has the function of centrally controlling multiple stations, 3a, 3b, . . .
3n is each dependent station.

Figure 4 shows an example of the arrangement of carriers in communication satellite 1, where 4 is a 5cpc carrier for transmitting data signals and voice signals (including signals for meeting lines), and 5 is a carrier for the sole purpose of monitoring and control. This is a carrier for a common signal channel in the TDMA (time division multiple access) system.

FIG. 5 shows an example of a transmission format of a common signal channel carrier.

FIG. 7 is a block diagram of a satellite communication system showing only the devices necessary for monitoring and control. In the figure, 9 indicates own station equipment controlled by the control station supervisory control panel 10 or subordinate station supervisory control panel 13, and 10 polls the own station equipment 9 and multiple subordinate stations to monitor and control the status of the equipment. 11 is a modem, 12 is a high frequency device, 1 is a monitoring control panel for a control station that performs
Reference numeral 3 denotes a subordinate station supervisory control panel that controls and monitors its own station equipment in accordance with supervisory control information from the control station supervisory control panel 10 and notifies the control station 2 of the equipment status.

Next, the operation will be explained using FIG. 7. The supervisory control panel 10 shown in FIG. 7 monitors and controls the own station equipment 9 according to the input information when the operator inputs equipment status setting information, and also monitors and controls the own station equipment 9 according to the input information.

output monitoring control information for control signals (consisting of the own station address and the station address to be controlled inserted into the signal, hereinafter referred to as a request signal) for the purpose of monitoring and controlling the stations b, ..., n); Notification is sent to each dependent station through the modem 11 and high frequency device 12. The information is collected in block A in FIG. 5 and transmitted on carrier 5 in FIG. The frame timing shown in FIG. 5 is determined by a self-running frame counter within the supervisory control device 10.

Next, the supervisory control panel 13 of the dependent station 3a that received the request signal addressed to its own station from the control station 2 immediately monitors and controls its own station equipment 9 in accordance with the request signal, and also receives the request signal from the control station 2. After detecting (detected using the station address), after a certain period of delay, the own station address is inserted into the status signal of the own station equipment, and the response signal supervisory control information (hereinafter referred to as response signal) is sent as shown in Figure 5. The signals are collected in block a and sent to the control station 2 via carrier 5 in FIG. The amount of delay for this fixed time can be arbitrarily varied by a delay circuit within the supervisory control panel 13. Similarly, block b in FIG.
This is a response signal addressed to the control station from b, and after receiving and detecting the request signal from the control station 2, it is output through a delay circuit set to a delay amount different from that of the dependent station 3a. Next, the control station 2 inputs the response signal from each dependent station 3 in the format shown in Figure 5, but the station address of each dependent station 3 inserted in the response signal indicates which station the information is about. recognize. In this way, from the control station 2 to a plurality of dependent stations 3a, 3b,...
, 3n, and response signals from multiple dependent stations can also be received by the control station, making it possible for the control station to centrally control multiple dependent stations.

[Problem to be solved by the invention]

As mentioned above, the conventional method handles communication information (data and voice).
Since monitoring and control was performed using a TDMA method, etc., which is different from the 5 CPC method for transmitting the data, there was a drawback that the scale of the device became large.

This invention was made in order to solve the above-mentioned problems, and provides an earth station monitoring and control system for satellite communication that eliminates the need for devices such as TDMA systems that transmit monitoring and control information, and makes it possible to downsize the device. is intended to provide.

[Means to solve the problem]

The earth station monitoring and control method for satellite communication according to the present invention is 5c
For the meeting line traditionally used for PC transmission,
F for transmitting normal audio and supervisory control information
The SK waves are multiplexed and transmitted, and the control station sequentially polls multiple dependent stations, and the multiple monitoring control information received from the dependent stations is sequentially switched and received in response to the polling station. In this system, multiple dependent stations can be centrally controlled from a control station.

[Effect]

Since the present invention has the above-described configuration, it is possible to eliminate the need for a device such as a TDMA system for transmitting supervisory control information, and it is possible to miniaturize the device.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the arrangement of carriers in the satellite communication 1 of FIG. 3 in the earth station monitoring and control system for satellite communication according to an embodiment of the present invention. 5cpc carrier, 6-A is control station 2
6-a is a carrier for a meeting line of the dependent station 3a, 6-b is a carrier for a meeting line of the dependent station 3b, and 6-n is a carrier for a meeting line of the dependent station 3n. FIG. 2 shows an example of multiplexing carriers for meeting lines. In the figure, 7 is an audio signal for a meeting, and 8 is supervisory control information for a control signal or a response signal.

FIG. 6 shows a timing flow for outputting monitoring control information of each station in the present invention. In the figure, a is a request signal output from the control station 2 to the dependent station 3a, b is a request signal to the dependent station 3b, and n
is a request signal output to the dependent station 3n, and a' is the request signal output to the dependent station 3a.
Similarly, b' is a response signal output from the dependent station 3b to the control station 2.

FIG. 8 is a block diagram of the satellite communication system according to the present invention, depicting only the devices necessary for monitoring and control. In the figure, 14
1 is a transmitter, 15 is a receiver, 16 is a meeting panel that connects the transmitter and receiver and converts input and output audio and electrical signals;
17 is a multiplexing circuit that multiplexes the voice converted into an electrical signal and the supervisory control information output from the supervisory control panel 10 in the form of FSK (frequency shift keying) waves; 20 is a modulator; and 21-a is a dependent station 3a. 21-b is a demodulator that receives signals from dependent station 3b, 21-n is a demodulator that receives signals from dependent station 3n, and 21-A is a demodulator that receives signals from control station 2. A demodulator 21 receives signals from a station other than the control station, and a modulator 22 sets a channel to receive a signal from a station other than the control station when making a meeting from a station other than the control station. A separation circuit 18 separates the monitoring control information and outputs it individually, in the control station 2,
A supervisory control information switcher 19 automatically switches and outputs the supervisory control information that is sequentially input in correspondence with the station polled for transmission and separated by the demultiplexing circuit 22; This is an audio signal switch that manually switches and outputs the signal to the station where you want to have a meeting.

Next, the operation will be explained using FIG. 8. When the operator inputs equipment status setting information, the supervisory control m10 in FIG. 8 monitors and controls the own station equipment 9 according to the input information, and also monitors and controls the own station equipment 9 according to the input information.

Input supervisory control information for control signals (the own station address and the station address to be controlled are inserted into the signal, hereinafter referred to as a request signal) to the multiplexer 17 for the purpose of supervisory control of the stations b, . . . , n). do. On the other hand, the voice output from the transmitter 14 as a meeting voice signal is converted into an electrical signal (voice) by the meeting panel 16 and input to the multiplexer 17 . The multiplexer 17 multiplexes the two input signals as shown in FIG. 2, and notifies each dependent station 3 through the modulator 20 and the high frequency device 12. The information to be notified to the dependent station 3 is sent to the n block in FIG. 6 for the dependent station 3a, to the b block in FIG. 6 for the dependent station 3b, and to the b block in FIG. 6 for the dependent station 3n. The signals are collected into n blocks and sent from the control station 2 on the carrier 6-A shown in FIG. The frame timing shown in FIG. 6 is determined by a self-running frame counter within the supervisory control device 10. Next, the dependent station 3a that received the signal from the control station 2 receives the signal input from the high frequency device 12, the demodulator 21-A whose channel is set to receive the signal from the control station 2, and the demodulator 21-A. Only the request signal is input to the supervisory control panel 13 through a separation circuit 22 that separates the electric signal (voice) and the request signal. After receiving the request signal addressed to its own station, the supervisory control panel 13 immediately monitors and controls its own equipment 9 according to the request signal, inserts its own address into the status signal of its own equipment, and sends the supervisory control information for the response signal ( The received signal is sent to the multiplex circuit 17 as a response signal (hereinafter referred to as a response signal). The timing at which this signal is sent is determined by detecting that the request signal from the control station 2 has been received (detected by the station address) and then delaying it for a certain period of time to become the timing a' in FIG. 6. It is assumed that this fixed time delay amount is the same value for other dependent stations and is set on the supervisory control panel 13. On the other hand, when the audio signal for the meeting is input from the control station 2, the demodulator 2
1-A and the separation circuit 22 to the audio signal switch 19. When input from a station other than the control station 2, the signal is input to the audio signal switch 19 through the demodulator 21 set to the transmission channel of that station and the separation circuit 22.

Then, the audio signal switch 19 manually selects one of the two, and the audio signal is input to the receiver 15 through the meeting panel 16. Next, the audio signal output from the transmitter 14 is input to the multiplex circuit 17 through the meeting panel 16. The response signal and the electrical signal (audio) are multiplexed in the multiplex circuit 17, and then passed through the modulator 20 and the high frequency device 12.
It is sent out on a carrier 6-a shown in FIG. Similarly, the n block in FIG. 6 is a response signal from the dependent station 3n to the control station 2, and the carrier 6-n in FIG. 1 is a multiplexed signal of a voice signal and a response signal sent from the dependent station 3n. Next, in the control station 2, the signal from the dependent station 3a is sent to the demodulator 2.
1-a, the signal from the dependent station 3b is sent to the demodulator 21-
b, and the signal from the dependent station 3n is sent to the demodulator 21-n.
The 0 separation circuit 22 separates the electrical signal (audio) from the response signal for each dependent station.
9, the response signal is output to the supervisory control information switch 18.

Here, the response signals received from each subordinate station are input to the supervisory control information switch 18 at the timing shown in FIG. is automatically switched and output to the monitoring control panel 10.

The other electric signal (voice) is manually set by the voice signal switch 19 so that the signal of the station to which the user wishes to talk is input to the telephone receiver 15 through the meeting panel 16. In this way, the control station can send request signals to multiple dependent stations, and the control station can also receive response signals from multiple dependent stations. Control becomes possible. Furthermore, it is possible to communicate without any problems on the meeting line as before.

In the above embodiment, the audio signal ICH and one block of supervisory control information are multiplexed and transmitted within the audio band as shown in FIG. 2, but in the second embodiment of the present invention shown in FIG. As shown in the figure, if one block of supervisory control information is transmitted for an additional 9 minutes, it is possible to send twice the amount of information in the same time as in the above example, and a more efficient and faster supervisory control method can be achieved. realizable.

Further, in the above embodiment, the modulation method is a frequency shift temperature change method in order to add supervisory control information. Although binary modulation is used, binary modulation using a differential phase modulation method may be used.

〔Effect of the invention〕

As described above, according to the present invention, a conventional meeting line is configured to be able to multiplex and transmit a signal adding supervisory control information, and a control station polls multiple subordinate stations. By switching the supervisory control information received from subordinate stations in response to the polling station, it is possible to perform centralized control from the control station. This eliminates the need for the device, which has the effect of making the device cheaper than before and making the device more compact.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a carrier arrangement in a communication satellite using an earth station monitoring and control system for satellite communications according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of signal multiplexing according to an embodiment of the present invention, and FIG. 4 shows an example of a carrier arrangement in a conventional communication satellite. FIG. 5 shows a transmission format on a satellite in a conventional TDMA system. FIG. A diagram showing a timing flow for outputting supervisory control information of each station, Figure 7 is a block diagram of a satellite communication system depicting only the equipment necessary for conventional supervisory control, and Figure 8 is a diagram showing the equipment necessary for supervisory control of the present invention. FIG. 9 is a block diagram of a satellite communication system depicting only the satellite communication system, and is a diagram showing an example of signal multiplexing according to another embodiment of the present invention. In the figure, l is a communication satellite, 2 is a control station, and 3a, 3b. 0. ,, 3n is a dependent station, 4 is a 5cpc carrier for transmitting data signals and audio signals, 5 is a TDMA common signal channel carrier for the purpose of monitoring and control only, 6A, 6a, . A carrier for a meeting line on which audio signals and supervisory control information are multiplexed, 7 is an audio signal, 8 is supervisory control information, 9 is own station equipment, 10 is a supervisory control panel for the control station, 11 is a modulator/demodulator 1, and 12 is a high frequency 13 is a supervisory control panel for subordinate stations; 14 is a transmitter; 15 is a telephone receiver; 16 is a panel for meetings; 17 is a multiplex circuit; 18 is a supervisory control information switch; 19 is an audio signal switch; 20 is a modulation device. Vessel, 21A
. 21a, . . . are demodulators, and 22 is a separation circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In an earth station monitoring and control system for satellite communications, in which the equipment status of multiple subordinate stations is centrally monitored and controlled remotely from a control station, monitoring and control information signals are multiplexed onto a communication meeting line established between each station. A satellite communication globe characterized in that a control station sequentially polls a plurality of dependent stations, and sequentially switches and receives a plurality of supervisory control information signals received from the dependent stations in correspondence with the polling station. Station monitoring control method.