JPS63187926A - Communication system utilizing communication satellite - Google Patents

Abstract

PURPOSE:To realize communication having high stability at a low cost by providing a ground repeater station being capable of communicating with a communication satellite, in each area, and executing the communication with a slave station in a remote place through the communication satellite. CONSTITUTION:Communication between a base 4 in an area A and a vehicle 5 is executed by using a radio frequency such an VHF, etc. When the base 4 or the vehicle 5 inputs a code number, etc., of its other party in order to communicate with a base 24 in an area B or a moving vehicle 25, a transmitting and receiving equipment 8 in a ground repeater station 2 receives those signals from an antenna 6, and a storage device 10 analyzes this code number, discriminates a fact that the transmission is executed through a communication satellite 1, and operates a controller 9. A radio frequency such as VHF, etc., from the base 4 or the vehicle 5 is converted to a microwave, transmitted to the communication satellite 1 through a parabolic antenna 3 from a transmitting and receiving equipment 7, and received by a parabolic antenna 26 of a ground repeater station 21. From this ground repeater station 21, a radio frequency such as VHF, etc., is transmitted to the base 24 or the moving vehicle 25.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a communication method for wirelessly exchanging information between remote locations. This invention relates to a communication system that uses communication satellites and ground relay stations to enable communication even with ordinary radio equipment.

[Technical background of the invention]

2. Description of the Related Art Communicating between remote locations by radio communication is used in a variety of ways, including for commercial purposes such as police, fire departments, and taxi services, and for hobbies such as amateur radio and personal radio. In this type of wireless communication, it is difficult to communicate in areas where communication is difficult due to topography,
In order to ensure communication with a wide range of areas, there are methods to increase the transmission power of not only radio equipment but also radio bases, relay stations, or mobile stations, and to increase the gain of antennas. It may not be compatible with all devices due to interference.

[Problem that the invention seeks to solve]

On the other hand, in recent years, wireless communication over a wide area using communication satellites has been put into practical use, but in order to use communication satellites, a satellite tracking device is required, and the wireless equipment has become large-scale. This cannot be done with radio equipment, and radio bases,
This can be implemented only at relay stations or vehicle-mounted mobile stations.

Therefore, the present invention provides a new communication system that uses communication satellites and enables communication over a wide area even with a portable radio.

[Means for solving problems]

A communication system using a communication satellite according to the present invention includes a first ground relay station equipped with a communication satellite tracking device and capable of communicating with the communication satellite using microwaves, and a first ground relay station located at a remote location with respect to the first ground relay station. A second terrestrial relay station that has the same configuration as the first terrestrial relay station, a first slave station that can communicate with the first terrestrial relay station using radio waves of a different frequency from microwaves, and a second terrestrial relay station that uses radio waves other than microwaves to communicate with the second terrestrial relay station. A second slave station capable of communicating by radio waves is provided, and the first slave station and the second slave station communicate via first and second terrestrial relay stations and a communication satellite.

[For production]

As before, VHF, UHF is used between each slave station and its relay station.
Or communicate using radio waves such as microwaves.

When a slave station communicates with a remote slave station, the slave station uses V
The information is transmitted to the relay station of the slave station on radio waves such as HF. The relay station converts this radio wave into a microwave with a frequency different from the above-mentioned microwave, controls a satellite tracking device, and transmits it to a communication satellite.

Relay stations in remote areas also track communication satellites with their tracking devices, so relay stations can communicate with relay stations in faraway areas via communication satellites; The received information is converted into radio waves such as VHF and transmitted to the slave station. Therefore, even if the slave station has the same configuration as before,
It is possible to communicate with remote slave stations.

【Example〕

Hereinafter, an embodiment of the present invention shown in the drawings will be described. In this embodiment, a case is taken as an example in which communication is carried out between an area A and an area B which is far away from area A via a communication satellite 1. A parabolic antenna 3, which is a tracking device for the communication satellite 1, and a transmitting and receiving antenna 6 for communicating with a base 4 and a mobile vehicle 5, which are slave stations, are attached to the roof of the ground relay station 2 in area A. A microwave transmitting/receiving device 7 and a radio wave transmitting/receiving device 8 such as VHF or UHF installed in the ground relay station 2 are connected to the parabolic antenna 3 and the transmitting/receiving antenna 6, respectively. These transmitting/receiving devices 7 and 8 also include a control device 9 that performs control such as converting microwaves into radio waves such as VHF or vice versa, and transmitting to the communication satellite 1 depending on the region of the slave station to be transmitted. , and the location of a slave station called by a code number or the like, and a storage device 1O is connected thereto which instructs the control device 9 to operate the transmitting/receiving device 7 as necessary. An antenna 11 for transmitting and receiving radio waves such as VHF to and from a transmitting and receiving antenna 6 is provided at the base 4 and the mobile vehicle 5.
．． 12 is attached, and a transmitting/receiving device (not shown) is installed inside.

Area B also has a terrestrial relay station 21 with the same configuration as area A, and a base 24 that is a slave station each equipped with antennas 22 and 23.
and moving vehicles 25 are arranged. Similar to the terrestrial relay station 2, the terrestrial relay station 11 is provided with a parabolic antenna 26 and a transmitting/receiving antenna 27.

Therefore, the communication between base 4 and vehicle 5 in area A is V
Communicate using existing radio frequencies such as HF. Base 4 or vehicle 5 is base 24 or mobile vehicle 25 in area B.
When the code number of the other party is inputted in order to communicate with the other party, the transmitting/receiving device 8 in the terrestrial relay station 2 receives these signals from the antenna 6.

The storage device 10 analyzes this code number, determines that it is to be transmitted via the communication satellite 1, operates the control device 9, and converts the existing radio frequency such as VHF from the base 4 or vehicle 5 into microwave. The radio wave is then transmitted from the transmitting/receiving device 7 to the communication satellite 1 via the parabolic antenna 3, and the radio wave is received from the communication satellite 1 by the parabolic antenna 26 of the ground relay station 21 in area B. The signal received by the parabolic antenna 26 is transmitted to the VH by the control device in the ground relay station 21.
The signal is converted to an existing radio frequency such as F, and is transmitted from the transmitting/receiving device via the antenna 27. If the radio waves from this antenna 27 are received by the antenna 22 or 23, the base 2
4 or a moving vehicle 25.

Transmission from area B to a slave station in area A is the opposite.

In the above embodiment, the ground relay station 2 is provided with communication equipment, but it may also be provided on the mobile vehicle 5, thereby making it possible to provide mobility to the relay station. Furthermore, although the slave station is constructed from a base or a mobile vehicle, it goes without saying that it may also be a portable radio device.

〔Effect of the invention〕

As described above, this invention provides ground relay stations capable of communicating with communication satellites in each region, and communicates with slave stations in remote areas via the communication satellites. Without any modifications, it becomes possible to communicate with remote locations to which transmission was previously impossible, and highly stable communications can be achieved at a relatively low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram schematically showing an embodiment of a device implementing the communication method of the present invention. In the drawing, 1 is a communication satellite, 2.21 is a ground relay station,
3 and 26 are parabolic antennas, and 4 and 24 are bases. 5.25 is a moving vehicle, 6, 11.12.22.23.
27 is an antenna, and 7 and 8 are transmitting/receiving devices.

Claims (3)

[Claims] (1) A system for communicating with a remote location using a communication satellite, comprising: a first ground relay station equipped with a tracking device for the communication satellite and capable of communicating with the communication satellite by microwave; a second terrestrial relay station that is located remotely from the relay station and has a similar configuration to the first terrestrial relay station; and a first slave station that can communicate with the first terrestrial relay station using radio waves other than the microwave. and a second slave station capable of communicating with the second terrestrial relay station using radio waves of a frequency different from that of the microwave, and the first slave station and the second slave station are connected to the first and second terrestrial relay stations. A communication system using a communication satellite, characterized in that communication is carried out via a station and the communication satellite. (2) A communication system using a communication satellite according to claim 1, wherein at least one of the first and second terrestrial relay stations is installed in a fixed position on the ground. . (3) The communication system using a communication satellite according to claim 1, wherein at least one of the first and second terrestrial relay stations is mounted on a movable vehicle.