JPH03123224A - Satellite communication system - Google Patents

Abstract

PURPOSE:To attain the control from all slave stations to all the other slave stations by providing to each slave station with a means converting a control signal transmission channel to a reception channel and connecting the channel to a receiver when a polling signal not designating its own station is received. CONSTITUTION:A master station 2 sends a polling signal designating a slave station 3n. Slave stations 3n, 31 receive the polling signal and the slave station 3n sends monitor information to the master station 2 and sends a control signal to, e.g. the slave station 31 simultaneously. Then the master station 2 receives the monitor information and the slave station 31 receives the control signal sent from the slave station 3n. Then slave stations 31-3n-1 not designated restore switching of a control signal transmission channel F1 to a reception channel. When the master station 2 sends a polling signal designating the slave station 31, the slave station 3n receiving it converts the channel F2 into the channel F1, the slave station 31 receives the polling signal designating its own station and sends the monitor information to the master station 2 and sends the result of processing. The slave station 3n receives the transmission information and the master station 2 receives the monitor information.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to a satellite communication system based on the 5CPC method,
In particular, it relates to remote control methods for ground stations.

[Conventional technology]

Conventionally, in the remote monitoring and control method of this type of satellite communication system, a polling signal sent from a master station contains a monitoring information request and a control instruction, and a slave station that receives the instruction from the master station receives the instructions. At the same time, the master station executes the specified control and transmits its own monitoring information, but since the transmission and reception channel arrangement is the same as that of all other slave stations, only the master station can receive the monitoring information.

[Problem to be solved by the invention]

The above-mentioned conventional remote monitoring and control method for satellite communication systems has the disadvantage that only the master station can send control instructions, so it is not possible to have a configuration in which the stations that are manned change during the day and night. be.

An object of the present invention is to provide a 5-cpc satellite communication system in which control instructions can be given between slave stations without going through a master station.

[Means to solve the problem]

In the satellite communication system of the present invention, each slave station has means for converting a control signal transmission channel to a reception channel and connecting to a receiver when receiving a polling signal that does not designate the slave station.

[Effect]

All slave stations that receive a polling signal that does not specify their own station convert their control signal transmission channel to a receiving channel, and the slave stations that receive a boring signal that specifies their own station return monitoring information for the master station. At the same time, when a control signal that specifies any other slave station is output, the specified slave station can receive the control signal, and then when it receives a polling signal that specifies itself from the master station, it A response can be sent to the slave station that sent the control signal to the station, so
Control signals can be sent and received between slave stations without going through the master station.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of an embodiment of the satellite communication system of the present invention, and FIG. 2 shows the master station 2 and child 7431 shown in FIG.
3n is a communication sequence chart between slave stations 3+ and 3n.

This satellite communication system consists of a communication satellite 1, a master station 2, and a slave station 31.
．． 32, -, 3n, a polling signal is transmitted from the master station 2 through the polling signal channel F1, and the slave stations designated to receive from the master station transmit the control signal through the control signal transmission channel F2.
When the monitoring information station of the own station: 3+, 32, ~, 3n receives a polling signal that does not specify the own station, it converts the control signal transmission channel F2 to the receiving channel, connects to the receiving device, and after a predetermined time. It has a channel switching device that restores the channel F2 to a transmission channel.

Next, the operation of this embodiment will be explained with reference to FIG.

First, the master station 2 sends out a polling signal specifying the slave station 3n at time t1. The slave station 3n receives the polling signal at time t2, the slave station 31 receives the polling signal at time t3, the slave station 3n sends monitoring information to the master station 2 at time t4, and at the same time sends a control signal to the slave station 31, for example. Suppose you send out Then, the master station 2 receives the monitoring information at time t5, and the slave station 31 receives the monitoring information at time t5.
Since the control signal transmission channel is changed to the reception channel by the reception of the polling signal of 3n, the control signal transmitted by the slave station 3n is received at time t6. Thereafter, after a predetermined polling signal transmission time interval has elapsed, the slave station 31. ~
3 old restores the conversion of control signal transmission channel F2 to reception channel. Next, when the parent 82 sends out a polling signal specifying the slave station 31 at time t7, the slave station 3n that receives this at time t8 converts the control signal transmission channel F2 to the reception channel, and the slave station 31 It receives a polling signal designated by its own station at t9, transmits monitoring information to the master station at time tto, and transmits the processing result for the control signal received from slave station 3n at time t6. The slave station 3n receives this transmission information at time t11, and the master station 2 receives the monitoring information at time t12.

In this way, mutual control between slave stations without bowling rights becomes possible.

〔Effect of the invention〕

As explained above, the present invention provides a control signal sending function for slave stations that have received a polling signal from a master station, and a transmission/reception channel reversal function for slave stations that have not received a station designation. By having a control signal reception function, it is possible to control all other slave stations from all slave stations, and conversion of stations to be manned during the day and night can be performed without making any changes to the equipment. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the satellite communication system of the present invention, and FIG. 2 shows the master station 2 and slave stations 31 and 3 shown in FIG.
It is a sequence chart of communication between n questions and slave stations 31 and 3n. 1... Communication satellite, 2... Master station, 3+, 32, ~3
n child station.

Claims (1)

[Claims] 1. In a satellite communication system based on the SCPC method, when each slave station receives a polling signal that does not specify its own station, means for converting a control signal transmission channel to a reception channel and connecting to a receiver. A satellite communication system characterized by having.