JPH05218920A - Control system for satellite communication equipment transmission power - Google Patents

Abstract

PURPOSE:To expand the service range to a ground station by optimum transmission power control of a transponder of a satellite communication equipment. CONSTITUTION:An up-link signal sent to a transponder mounted on an artificial satellite with up-linking from a ground station is inputted to a frequency converter 4 through an antenna 1 and a diplexer 2, in which the signal is converted into an intermediate frequency signal. The signal is subject to AGC control by an AGC attenuator 6 of an AGC loop, the result passes through a band pass filter 7 and the result is detected by a detector 8. Then the signal is used for a reception system AGC attenuator 6 and a transmission system output level controller 7 by a control signal amplifier 9, a down-link signal for a ground station outputted via a driver amplifier 12, a high output amplifier 13, the diplexer 2 and the transmission reception antenna 1 is optimizingly controlled by the same condition as the up-link signal and the reduction of the service range due to over-control is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system for satellite communication equipment, and in particular, in satellite communication, satellite broadcasting services, etc. TECHNICAL FIELD The present invention relates to a transmission power control method for satellite communication equipment that controls transmission power.

[0002]

2. Description of the Related Art Conventionally, satellite communication devices equipped with artificial satellites of this type have used fixed communication power or a communication power switching function according to a command from a ground station.

[0003]

In the case of the above-mentioned conventional satellite communication equipment, the power flux density regulation or the like for the purpose of avoiding interference or the like in the communication line using the frequency shared with the terrestrial public line is satisfied. For this reason, there is a drawback in that the transmission power is restricted more than necessary, which limits the service performance itself.

The object of the present invention is to eliminate the above-mentioned drawbacks and provide a satellite communication equipment transmission power control system capable of ensuring the desired service by controlling the optimum downlink signal transmission power corresponding to the situation of the transmission path. To do.

[0005]

In the satellite communication equipment transmission power control method of the present invention, a satellite communication equipment equipped with an artificial satellite which receives an uplink signal from a ground station detects the level of the uplink signal, It is configured to include means for controlling the transmission power level of the downlink signal to the ground station corresponding to the level.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. The configuration of the embodiment shown in FIG. 1 has a transmission / reception antenna 1, a diplexer 2, an oscillator 14 and an AG common to a transmission / reception system.
AGC attenuator 6, bandpass filter 7, detector 8, control signal amplifier 9 forming a C loop, low noise amplifier 3, frequency converter 4, intermediate frequency amplifier 5 and reception system station transmitter / receiver 15 as a reception system And a frequency converter 10 as a transmission system, an output level controller 11, a driver amplifier 12 and a high output amplifier 13.

Next, the operation of this embodiment will be described.

In FIG. 1, an uplink signal transmitted from a ground station is received by a low noise amplifier 3 via a transmission / reception antenna 1 and a diplexer 2.

This received signal is mixed with the output of the reception system station transmitter / receiver 15 by the frequency converter 4, converted into an intermediate frequency, and then controlled to a required constant level by the intermediate frequency amplifier 5 and the AGC attenuator 6. .

As a control signal for controlling the AGC operation of the AGC attenuator 6, the output signal whose power is controlled by the AGC attenuator 6 is input to the detector 8 through the bandpass filter 7 and detected, and the detected output is detected by the control signal amplifier 9. It is amplified and obtained.

The intermediate frequency signal band-limited by the bandpass filter 7 is transmitted by the frequency converter 10 to the transmission system station multiplier 1
After being mixed with the output of No. 6 and converted into the downlink frequency to be sent to the ground station, the level is controlled by the output level controller 11.

The level control in the output level controller 11 is performed by using the output of the control signal amplifier 9 as a control signal, like the level control of the receiving system. This means that the level control of the transmission system is also performed by the output of the same AGC loop as the reception system.

In a satellite communication device mounted on an artificial satellite, a so-called satellite transponder, an uplink signal, that is, a reception frequency is higher than a downlink signal, that is, a transmission frequency. For example, 14 GHz reception / 12 GHz transmission, 30 GHz reception / 20 GHz transmission, An example of 50 GHz reception / 40 GHz transmission is shown. In other words, by using the uplink signal itself, which is easily affected by radio wave propagation characteristics on the transmission path such as rainfall attenuation, as a sensor, and finely controlling the transmission power of the downlink transmission signal according to the attenuation, It is possible to eliminate unnecessary suppression of transmission power due to the regulation of the power flux density, etc., and to perform unnecessary compression and avoidance of service range.

[0015]

INDUSTRIAL APPLICABILITY The present invention described above allows a ground station user to use a detection output used for level control of a receiving system of a satellite communication device (satellite transponder) mounted on an artificial satellite for transmission power control. On the other hand, a stable downlink signal can be supplied while avoiding unnecessary suppression, and the compression of the service range can be significantly reduced.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Transmitting / receiving antenna 2 Diplexer 3 Low noise amplifier 4 Frequency converter 5 Intermediate frequency amplifier 6 AGC attenuator 7 Bandpass filter 8 Detector 9 Control signal amplifier 10 Frequency converter 11 Output level controller 12 Driver amplifier 13 High output amplifier 14 Oscillator 15 Receiving system station multiplier 16 Transmit system station multiplier

Claims (1)

[Claims] 1. A satellite communication device mounted on an artificial satellite, which receives an uplink signal from a ground station, detects the level of the uplink signal, and the transmission power level of the downlink signal to the ground station corresponding to the level. A satellite communication device transmission power control method comprising means for controlling the transmission power.