JPH10178378A - Satellite communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain efficient and speedy transmission by allowing a receiving station to transmit data showing the operating state of a satellite transponder on the side of a transmitting station to the side of the transmitting station and allowing the transmitting station to recognize the operating state of the satellite transponder. SOLUTION: Based on the transmission signal 13 of a transmitter 1 and the transmission signal 23 of the transmitting station 2, a receiver 3 prepares information on all the presently used satellite transponders and returns the answer signals 31, 32 (31=32) of completely the same contents to a transmitting station 1 and the transmitting station 2. These answer signals 31 and 32 are sent also to transmitting stations using no transponder presently and when a transmitting station tries to transmit, e.g. it catches these answer signals 31 and 32 and automatically recognizes a dead slot to send. The receiving station 3 sends a signal for recognizing information on the dead slot of the satellite transponder 4 based on received radio wave. Thereby it is possible to automatically send to a dead slot without passing through a manual system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite communication system, and more particularly to recognition of the operation status of a satellite transponder used for satellite broadcasting and satellite communication and automatic transmission of radio waves.

[0002]

2. Description of the Related Art Conventionally, when transmitting radio waves using a satellite, the transmitting station (fixed station, mobile station or vehicle-mounted station) cannot recognize the operation status of the satellite transponder. For this reason, the transmitting station has to be instructed of the empty slot of the satellite transponder from the receiving station (or a ground station that manages a large number of radio waves emitted to the satellite transponder).

[0003] In this case, especially when a radio wave is emitted from a vehicle-mounted station, in addition to a driver or a carrier of the vehicle, a skilled person who can always check the radio wave condition with the receiving station by telephone or the like and operate the transmitter is required. There was a problem of needing.

[0004]

The above conventional satellite communication system is inefficient in that the transmitting station waits for an instruction from the receiving station in order to recognize an empty slot in the satellite transponder, and requires extra labor. There was a problem.

An object of the present invention is to provide an improved satellite communication system in order to solve the above problems of the conventional satellite communication system.

[0006]

According to the satellite communication system of the present invention, (1) a receiving station transmits data indicating an operation state of a satellite transponder on the transmitting station side to the transmitting station side, and the transmitting station receives the data. Automatically transmits radio waves based on information on empty slots. (2) The transmitting station transmits to the receiving station a signal requesting data indicating the operational state of the satellite transponder, and in response to this signal, the receiving station transmits data indicating the operational state of the satellite transponder at the transmitting station to the transmitting station. And the transmitting station receiving the data automatically transmits a radio wave based on the information on the empty slot. (3) In a transmitting station and a receiving station in which respective antennas are opposed to each other via a transponder, the transmitting station is connected to one of the antennas, a duplexer connected to the antenna, and a transmitting signal connected to the duplexer. And a transmitter controlled by a transmitter controller and a vacant slot information signal receiver connected to the demultiplexer and transmitting vacant slot information received by the demultiplexer to the transmitter controller. A receiving station is connected to the other one of the antennas, and further comprises an empty slot information signal transmitter connected to the antenna.

According to the satellite communication system of the present invention, the receiving station gives information data on the operation status of the satellite transponder to the transmitting station, so that the transmitting station can automatically transmit information to the satellite transponder without passing through a human system. Can be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a system diagram of one embodiment.
In the figure, a transmitting station 1 is arranged facing a receiving station 3 via a satellite transponder 4 together with a vehicle-mounted station 2.

[0010] As for the transmission radio wave, a radio signal 13 transmitted from the transmitting station 1 to the receiving station 3 is received by the receiving station 3 via the satellite transponder 4. Similarly, a radio signal 23 transmitted from the vehicle-mounted station 2 to the receiving station 3 is received by the receiving station 3 via the satellite transponder 4.

Next, the receiving station 3 receives the transmission signal of the transmitting station 1.
Based on the transmission signal 13 and the transmission signal 23 from the transmission station 2, information on all currently used satellite transponders is created, and the transmission signals 31 and 32 having exactly the same contents are transmitted to the transmission stations 1 and 2.
(31 = 32) is returned. These reply signals 31 and 32 are also sent to the transmitting station 4 not currently using the transponder. For example, when the transmitting station 4 tries to transmit, the reply signals 31 and 32 are caught and automatically transmitted. Is recognized and transmitted.

The receiving station 3 transmits a signal (FIG. 2) for recognizing the information on the empty slot of the satellite transponder 4 based on the received radio wave. FIG. 2 shows the band used in the satellite transponder as an example. In FIG. 2, the information signal of the vacant slot, the transmission radio wave, and the vacant slot 20 are recognized.

As shown in FIG. 3, the configuration of the transmitting station is such that an information signal for recognizing an empty slot is received by a duplexer 52 provided between the transmitter 51 and the antenna 10. Sent to the station. Upon receiving the information signal, the receiving station transmits an empty slot information signal from the empty slot information signal transmitter 35 to the transmitting station.

Next, on the transmitting station side, a transmitting signal is transmitted from the transmitter 51 to the receiving station 3 by the transmitter control device 54 based on the received information signal.

The transmitting station 1 the on-board station 2
In order to receive the radio signal 31 (Fig. 1),
And an empty slot information signal receiver 53 shown in (1). If an empty slot is found, the transmitter controller 54 is operated.

As described above, in the satellite communication system according to the present invention, as shown in FIG. 3, the transmitting station and the receiving station in which the respective antennas face each other via the transponder are the transmitting stations, A duplexer 52 connected to one of the antennas 10; a transmitter 51 connected to the duplexer 52 for transmitting a transmission signal thereto and controlled by a transmitter controller 54; And a vacant slot information signal receiver 53 for transmitting the vacant slot information received by the vacant slot information to the transmitter control device 54, wherein the receiving station is connected to the other antenna 10 of the antennas, and And a vacant slot information signal transmitter 35 connected to the device.

According to the above description, the transmitting station recognizes the operation status of the satellite transponder, so that automatic transmission to an empty slot is possible without passing through a human system. As a result, human error is prevented beforehand, and the burden on the operator is reduced.

[0018]

According to the present invention, the receiving station transmits data indicating the operating state of the satellite transponder on the transmitting station side to the transmitting station side, and the transmitting station recognizes the operating state of the satellite transponder, so that transmission can be performed without passing through a human system. This has the significant advantage that transmission can be achieved efficiently and quickly. There is also an advantage that there is no human error and the burden on the working staff can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of a satellite communication system using a satellite transponder.

FIG. 2 is a diagram showing an example of a used band in a satellite transponder;

FIG. 3 is a configuration diagram of an embodiment of a satellite communication system according to the present invention;

[Explanation of symbols]

1 ... transmitting station 2 ... on-board station 3 ... receiving station 4 ... satellite transponder 10 ... antenna 20 ... empty slot 13 ... radio signal between transmitting station and receiving station (via satellite transponder) 31 ... radio signal between receiving station and transmitting station (satellite) 23: Radio signal between in-vehicle station and receiving station (via satellite transponder) 32: Radio signal between receiving station and in-vehicle station (via satellite transponder) 35 ... Empty slot information signal transmitter 51 ... Transmitter 52 ... Demultiplexer 53: Empty slot information signal receiver 54: Transmitter braking device

Claims (3)

[Claims] 1. A receiving station transmits data indicating an operation state of a satellite transponder on a transmitting station side to a transmitting station side, and the transmitting station receiving the data automatically transmits a radio wave based on information on an empty slot. A satellite communication system. 2. A transmitting station transmits a signal requesting data indicating the operation state of the satellite transponder to the receiving station, and the receiving station transmits data indicating the operating state of the satellite transponder on the transmitting station side in response to the signal. A satellite communication system in which a transmitting station that transmits data to a station and receives the data automatically transmits a radio wave based on information on an empty slot. 3. A transmitting station and a receiving station in which respective antennas face each other via a transponder, wherein the transmitting station is connected to a splitter connected to one of the antennas, and connected to the splitter. A transmitter controlled by a transmitter controller for transmitting a transmission signal; and an empty slot information signal receiver connected to the duplexer and transmitting the received empty slot information to the transmitter controller. A satellite communication system, wherein the receiving station is connected to the other one of the antennas, and further comprises an empty slot information signal transmitter connected to the antenna.