JPH0575516A - System for monitoring satellite communication circuit - Google Patents

Abstract

PURPOSE:To monitor the quality of a satellite circuit and also the state of an earth station with high efficiency and simple constitution. CONSTITUTION:A common signal transmission-receiver 10 generates the specific circuit evaluation data through a circuit evaluation data generating part 103 to evaluate the quality of a satellite circuit and then by multiplexing the evaluation data with the state monitoring information through a common signal multiplexing part 104 these pieces of information are sent to an earth station. Furthermore the addresses are designated so that all earth stations receive the circuit evaluation data. A common signal transmission-receiver of each earth station receives the multiplexed signal and extracts the circuit evaluation data Dt through a common signal processing part 202. A bit error rate calculating part 203 compares the data held previously with the data Dt to calculate a bit error rate. When the bit error rate is deteriorated less than a prescribed level, the circuit quality information Dq is generated and sent to a control station. Thus the control station controls the address in order to stop the state monitoring the earth station having the deteriorated circuit quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite communication line monitoring system, and more particularly to a satellite communication line in satellite communication in which a plurality of earth stations share a plurality of satellite communication lines in accordance with instructions from one control station. Monitoring system.

[0002]

2. Description of the Related Art In a conventional satellite communication line monitoring system, a control station manages a shared transmission line and allocates the transmission line in response to a request. In this case, a transmission line for a common signal for transmitting the transmission line allocation information is provided between the control station and the earth station. Each earth station always receives a common signal from the control station, and receives a frequency allocation of a communication signal from the control station when performing communication.

In order to monitor the status of each earth station, the control station transmits status monitoring information to each earth station as a common signal and receives a common signal indicating the status from each earth station. ..

Conventionally, when the control station monitors the state of the earth station, as shown in FIG. 3, first, in the control station, the address of the earth station selected by the address selecting unit 401 of the common signal transmitting / receiving device 40 and the common The state monitoring information for each earth station generated by the signal data generating unit 402 is multiplexed by the common signal multiplexing unit 403 into a predetermined format as shown in FIG. 4, and further modulated by the common signal modulating unit 404, and then the transmitter 4
1 to the earth station via the antenna 43 and the communication satellite 30.

In the earth station, the signal transmitted by the control station is received by the antenna 53 and the receiver 52, demodulated by the common signal demodulating section 501 of the common signal transmitting / receiving apparatus 50, and the common signal processing section 502 decodes the common signal data. Then, the data indicating the state of the earth station is generated, modulated by the common signal modulator 503, and then transmitted to the control station via the transmitter 51, the antenna 53, and the communication satellite 30.

Further, the control station receives the signal indicating the state transmitted by the earth station via the antenna 43 and the receiver 42, demodulates it by the common signal demodulation section 405 of the common signal transmission / reception device 40, and the common signal processing section 406. The status of each earth station is monitored by processing at.

[0007]

As described above, when the control station monitors the status of each earth station, it does not work for all earth stations, that is, for earth stations that are not operating normally. A common signal is sent to monitor the status. Therefore, as the number of earth stations increases, it takes a long time to monitor the condition, and the condition monitoring interval becomes long.
In addition, in this method, if the response signal from each satellite communication earth station cannot be received, it is not possible to determine whether the satellite circuit is abnormal due to rainfall or the equipment of the earth station has failed, so it is always possible for all earth stations to communicate. We are monitoring it.

An object of the present invention is to provide a satellite communication line monitoring system capable of monitoring the satellite line quality with a simple structure and efficiently executing the condition monitoring of the earth station.

[0009]

The satellite communication line monitoring system of the present invention is a satellite communication in satellite communication in which a plurality of earth stations share a plurality of satellite communication lines according to an instruction from one control station. In the line monitoring method, the control station includes means for generating specific data for evaluating the line quality of the satellite communication line, and the plurality of satellite communication earths by multiplexing the specific data at a predetermined cycle. Means for transmitting to all of the stations; the earth station receives the specific data, compares it with data that is stored in advance, and calculates a bit error rate; And means for generating line quality information and transmitting it to the control station. Further, the control station includes means for controlling communication with the earth station according to the line quality information.

[0010]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, showing a control station and an earth station.

When the control station monitors the state of the earth station, the address selecting section 10 of the common signal transmitting / receiving device 10 on the control station side
1 selects the address of each earth station, the common signal data generation unit 102 generates state monitoring information for each earth station, and the line evaluation data generation unit 103 is for evaluating the quality of the satellite line. The specific line evaluation data is generated and sent to the common signal multiplexing unit 104.

The common signal multiplexer 104 multiplexes these data in a predetermined format as shown in FIG. Here, the line evaluation data is arranged as data for all stations next to the status monitoring information for the earth station, and the all-station address is used to cause all earth stations to receive the data.

The common signal modulator 105 modulates the signal multiplexed by the common signal multiplexer 104 and transmits it to the earth station via the transmitter 11, the antenna 13 and the communication satellite 30.

In the earth station, the signal transmitted by the control station is received by the antenna 23 and the receiver 22 and demodulated by the common signal demodulation section 201 of the common signal transmitting / receiving apparatus 20. The common signal processing unit 202 processes the data addressed to itself, extracts the line evaluation data Dt, and sends it to the bit error rate calculation unit 203.

The bit error rate calculation unit 203 compares the data held in advance with the received data to calculate the bit error rate. When the bit error rate becomes worse than a predetermined value, the common signal processing unit 202 sets the line quality information Dq.
Send to. Also, the channel quality information Dq is sent to the common signal processing unit 202 even when the bit error rate recovers to a predetermined value. The common signal processing unit 202 modulates the line quality information Dq by the common signal modulation unit 204 and transmits it to the control station via the transmitter 21 and the antenna 23.

The control station receives the signal transmitted by the earth station via the antenna 13 and the receiver 12, demodulates it by the common signal demodulation section 106 of the common signal transmission / reception apparatus 10, and processes it by the common signal processing section 107. There is. Here, the common signal processing unit 107 analyzes the line quality information and controls the address selection unit 101. Now, when the line quality deteriorates,
The state monitoring for the earth station whose satellite line quality has deteriorated is stopped, and when the line quality is restored, the state monitoring for the earth station whose satellite line quality has been restored is restarted.

[0018]

As described above, according to the present invention, the control station for monitoring the condition of the earth station sends specific line evaluation data for evaluating the quality of the satellite line to all earth stations at a predetermined cycle. Each earth station receives specific line evaluation data, calculates the bit error rate, generates line quality information according to the bit error rate, and sends it to the control station. The condition monitoring can be efficiently performed by performing the condition monitoring only on the earth station which is normally operating and the earth station whose line is normal, according to the line quality information of. Further, since the bit error rate is calculated by comparing the data held in advance with the received line evaluation data, there is an effect that an accurate bit error rate can be calculated with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an output data configuration of a common signal multiplexing unit 104 shown in FIG.

FIG. 3 is a block diagram showing an example of a conventional satellite communication line monitoring system.

4 is a diagram showing an example of an output data structure of a common signal multiplexing unit 403 shown in FIG.

[Explanation of symbols]

 101 Address Selector 103 Channel Evaluation Data Generator 104 Common Signal Multiplexer 107, 202 Common Signal Processor 203 Bit Error Rate Calculator Dt Channel Evaluation Data Dq Channel Quality Information

Claims (2)

[Claims] 1. In a satellite communication line monitoring system in satellite communication, wherein a plurality of earth stations share a plurality of satellite communication lines in accordance with an instruction from one control station, and the control station is the satellite communication line. Means for generating specific data for evaluating the line quality of the satellite, and means for multiplexing the specific data in a predetermined cycle and transmitting the multiplexed data to all of the plurality of satellite communication earth stations; , Means for calculating the bit error rate by comparing the specific data with the data held in advance, and generating channel quality information in accordance with the bit error rate and sending it to the control station A method for monitoring a satellite communication line, comprising: 2. The satellite communication line monitoring system according to claim 1, wherein the control station comprises means for controlling communication with the earth station according to the line quality information. Line monitoring method.