JPH05206968A - Space/time division communication equipment - Google Patents

Abstract

PURPOSE:To provide a communication equipment capable of transmitting different channels to two artificial satelites by time-dividing the whole output power of one power amplifier. CONSTITUTION:The base-band signals 1 of CH1 to CHn are duplicated on a time axis in a duplicating equipment 2 by a time division controller 9. Afterwards, a modulation equipment 3 superimposed the signals into a high frequency signal, the power amplifier 4 inputs it and a time division controller 9 controls a signal switching part consisting of a first four-terminal directional coupler 6, a variable phase shifter 7 and a second four-terminal directional coupler 8 with the duplicating equipment 2. Thus, the whole output of the power amplifier of the optional channels of an input signal 1 can be selected/sent to a transmission antenna 10 or 11 and transmitted to a first communication system consisting of a first artificial satelite 12 and a receiver 14 and the second communication system consisting of a second artificial satelite 13 and a receiver 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device used for microwave communication such as satellite communication.

[0002]

2. Description of the Related Art In recent years, with the increase in the number of communication satellites and the number of channels, the transmission form thereof has been diversified. Among them, as the number of artificial satellites increases, the number of modes in which one transmitter provides services to many receiving stations is increasing. When there are a plurality of artificial satellites, at the frequency above the SHF band, the antenna directivity is currently limited, so that the earth station generally uses one antenna to communicate with one communication satellite. On the other hand, means for time division multiplexing many channels is generally used from the viewpoint of utilization efficiency of the artificial satellite repeater.

A conventional space-time division communication device will be described below. FIG. 6 is a configuration diagram of a conventional system for transmitting a plurality of channels to two artificial satellites by time division. In FIG. 6, 1 is a plurality of input signals CH1 to CH
n, 2 are multiplexers, 3 are modulators, 4 and 4'are amplifiers, 1
7 is a distributor, 18 is a time division controller, 10 is a first transmitting antenna, 11 is a second transmitting antenna, 12 is a first artificial satellite, 13 is a second artificial satellite, and 14 is a first artificial satellite. A satellite receiver, 15 is a second artificial satellite receiver.

The operation of the conventional space-time division communication apparatus configured as described above will be described below. CH1
The CHn baseband signal 1 is multiplexed on the time axis by the multiplexer by the time division controller 18. Then, the modulator 3 superimposes it on the high-frequency signal, and the distributor 17 divides it into two parts, which are input to different power amplifiers 4 and 4 ', respectively.
It is sent to one transmitting antenna 10 and 11 and sent to different artificial satellites 12 and 13, respectively. As a result, both the receiving station 14 of the first artificial satellite 12 and the receiving station 15 of the second artificial satellite 13 can receive the signals of CH1 to CHn.

[0005]

However, the above-mentioned conventional structure has a problem that two amplifiers are required to transmit to two artificial satellites.

The present invention solves the above-mentioned conventional problems, and the total output power of one power amplifier is divided into two by time division.
An object is to provide a space-time division communication device capable of transmitting different channels to two artificial satellites.

[0007]

[Means for Solving the Problems] To achieve this object
In addition, the space-time division communication device of the present invention consists of multiple channels.
Input multiplexer and the output of the multiplexer.
Input power amplifier and output of said power amplifier
A first four-terminal directional coupler, and the first four-terminal directional coupler
A matching terminator terminating the other one of the combiner inputs,
It is possible to input one output of the first four-terminal directional coupler.
The phase shifter and the other output of the first four-terminal directional coupler.
Force and the second four-terminal direction for inputting the output of the variable phase shifter
Input and the output of the second four-terminal directional coupler.
Two transmitting antennas, and the two transmitting antennas
Two satellites for relaying radio waves from the satellite and the multiplexer
And a time division controller for controlling the phase of the variable phase shifter
It has a configuration.

[0008]

With this configuration, the present invention controls the phases of the multiplexer and the variable phase shifter simultaneously by the time division controller, so that the total output power of one power amplifier is divided into two artificial satellites by time division. Different channels can be transmitted.

[0009]

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

FIG. 1 is a block diagram of a space-time division communication device according to an embodiment of the present invention. In FIG. 1, 1 is a plurality of input signals CH1 to CHn, 2 is a multiplexer, 3 is a modulator, 4 is an amplifier, 5 is a matching terminator, 6 is a first four-terminal directional coupler, and 7 is variable. Phaser, 8 is a second four-terminal directional coupler,
9 is a time division controller, 10 is a first transmitting antenna, 11
Is a second transmitting antenna, 12 is a first artificial satellite, 13 is a second artificial satellite, 14 is a receiver of the first artificial satellite, 15
Is the receiver of the second satellite.

The operation of the space-time division communication apparatus configured as described above will be described with reference to FIGS. 2 and 3.

FIG. 2 shows the operation of the signal switching section of FIG. 1 by showing the amplitude at each terminal position as a vector. In the case of using the four-terminal couplers 6 and 8 in which the phases of the output signals are 90 ° different from each other in FIG. 2, the input signal of the amplitude Ei is input to the terminal T4 when the phase amount of the variable phase shifter 7 is 0 °, 18
At 0 °, all the input power is output to the terminal T3. Therefore, by switching the phase amount of the variable phase shifter 7 between 0 ° and 180 °, the total input power of the terminal T1 can be sent to any one of the two output terminals T3 and T4. FIG. 4 is a configuration example of a four-terminal directional coupler, and FIG. 5 is a configuration example of a variable phase shifter. In the figure, 16 is a variable capacitance diode.

Next, FIG. 3 shows the operation of the time division control of FIG. In this embodiment, the odd channels of CH1 to CHn are used for the first artificial satellite 12 and the even channels are used for the second artificial satellite 1.
It is a case of transmitting to No. 3. The time division controller 9 sends a signal as shown in FIG. 1A, and the multiplexer 2 multiplexes the input signal on the time axis as shown in FIG. 2B by the signal. At the same time, the variable phase shifter 7 changes its phase according to the signal from the time division controller 9 as shown in FIG. As a result, according to the operation shown in FIG. 2, the odd channel is transmitted to the first artificial satellite 12 via the transmitting antenna 10 and the even channel is transmitted to the second artificial satellite 13 via the transmitting antenna 11.

As described above, the baseband signals 1 of CH1 to CHn in FIG. 1 are multiplexed on the time axis by the multiplexer 2 by the time division controller 9. After that, the signal is superimposed on the high frequency signal by the modulator 3 and input to the power amplifier 4, and the signal switching unit is composed of the first four-terminal directional coupler 6, the variable phase shifter 7, and the second four-terminal directional coupler 8. Is controlled by the time division controller 9 together with the multiplexer 2,
The entire output of the power amplifier 4 of an arbitrary channel of the input signal 1 is selected and transmitted to the transmission antenna 10 or the transmission antenna 11, and the first communication system including the first artificial satellite 12 and the receiver 14, It can be transmitted to the second communication system including the two artificial satellites 13 and the receiver 15.

In this embodiment, the modulator 3 is replaced with the multiplexer 2
, But may be before multiplexer 2. Further, the phase amount of the variable phase shifter 7 is changed from 0 ° to 180 °.
It is also possible to distribute the output power of the amplifier 4 to the two artificial satellites and transmit it by setting the value within the range of.

[0016]

As described above, according to the present invention, there is an excellent effect that the total output power of one power amplifier can be transmitted to a plurality of artificial satellites by time division.

[Brief description of drawings]

FIG. 1 is a diagram of a space-time division communication device according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of a signal switching unit according to an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of time division control according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of a four-terminal directional coupler according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a variable phase shifter according to an embodiment of the present invention.

FIG. 6 is a diagram of a conventional space-time division communication device.

[Explanation of symbols]

 2 multiplexer 4 amplifier 6 first four-terminal directional coupler 7 variable phaser 8 second four-terminal directional coupler 9 time division controller 10 first transmitting antenna 11 second transmitting antenna 12 first Artificial satellite 13 Second artificial satellite

Claims (1)

[Claims] 1. A multiplexer for inputting a signal composed of a plurality of channels, a power amplifier for inputting an output of the multiplexer, and a first four-terminal directional coupler for inputting an output of the power amplifier. A matching terminator terminating the other one of the inputs of the first four-terminal directional coupler; a variable phaser inputting one output of the first four-terminal directional coupler; Second four-terminal directional coupler for inputting the other output of the four-terminal directional coupler and the output of the variable phase shifter, and two transmissions for inputting the output of the second four-terminal directional coupler An antenna, two artificial satellites that relay radio waves from the two transmitting antennas, and a time division controller that controls the phases of the multiplexer and the variable phase shifter, and the total output power of one power amplifier. Send different channels to two satellites by time division Space division communication device when you can.