JPH05218924A - Transmission power control system - Google Patents
Transmission power control systemInfo
- Publication number
- JPH05218924A JPH05218924A JP2084792A JP2084792A JPH05218924A JP H05218924 A JPH05218924 A JP H05218924A JP 2084792 A JP2084792 A JP 2084792A JP 2084792 A JP2084792 A JP 2084792A JP H05218924 A JPH05218924 A JP H05218924A
- Authority
- JP
- Japan
- Prior art keywords
- level
- frequency
- transmission
- rainfall
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Transmitters (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は送信電力制御方式に関
し、特に衛星通信における降雨減衰の大きい準ミリ波帯
以上の周波数を使用する地球局においてアップリンクの
降雨減衰を補償する送信電力制御方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control method, and more particularly to a transmission power control method for compensating for uplink rain attenuation in an earth station using a frequency above the quasi-millimeter wave band where rain attenuation is large in satellite communication. ..
【0002】[0002]
【従来の技術】一般に衛星通信の地球局において、降雨
減衰の大きい準ミリ波帯以上の周波数を使用する場合に
は、降雨減衰の大きいときには地球局の送信電力を増加
させてアップリンクの降雨減衰を補償するための送信電
力制御が必要となる。2. Description of the Related Art Generally, in a satellite communication earth station, when a frequency above the quasi-millimeter wave band with large rain attenuation is used, when the rain attenuation is large, the transmission power of the earth station is increased to increase the uplink rain attenuation. The transmission power control for compensating for is required.
【0003】従来この種の送信電力制御方式の動作手順
としては、ダウンリンクの降雨減衰量を衛星から送出さ
れるビーコン信号を用いて実測し、この測定値からビー
コン信号の周波数をパラメータとする後述する関係式
(1)から、まず降雨強度R(mm/h)を求める。次
にアップリンクの送信周波数についてこのRを使用し、
降雨減衰量Aを再度(1)式を使って求める。Conventionally, as an operation procedure of this type of transmission power control system, downlink rain attenuation is actually measured using a beacon signal transmitted from a satellite, and the frequency of the beacon signal is used as a parameter from the measured value, which will be described later. First, the rainfall intensity R (mm / h) is obtained from the relational expression (1). Then use this R for the uplink transmit frequency,
Rainfall attenuation A is calculated again using equation (1).
【0004】次に、関係式(1)は減衰量AdB/Km
とし、降雨強度R(mm/h)とし、係数r、又、べき
数n=0.88(17.7GHz≦f<31GHz)と
すると、 A=r・Rn …(1) となる。ここで計数rは周波数の関数として(2)式と
なる。Next, the relational expression (1) is the attenuation amount AdB / Km.
When the rainfall intensity is R (mm / h), the coefficient is r, and the power is n = 0.88 (17.7 GHz ≦ f <31 GHz), A = r · R n (1) Here, the count r is a function of the frequency and becomes the formula (2).
【0005】 r=0.1423−3.0976×10-2×f+3.1174×10-3 ×f2 −8.8328×10-5×f3 +8.9270×10-7 ×f4 …(2) 前述の(1),(2)式を用いてアップリンクの降雨減
衰量を補償する送信電力制御を行うが、このような従来
例の構成としては、図3に示す構成により行っている。
図3において送信系への入力信号Aはアップコンバータ
1により送信周波数に変換され、レベル制御器3により
レベル制御されRF信号3Aを出力する。もう一方の入
力信号はアップコンバータ2により送信周波数に変換さ
れ、レベル制御器4によりレベル制御されRF信号4B
を出力する。RF信号3A,4Bは合成器5により合成
された周波数の異なる2波の送信信号は電力増幅器6に
より所定のレベルまで共通増幅されアンテナ7から送信
される。次に、地球局の受信系は衛星からのビーコン信
号をアンテナ7で受信し、低雑音増幅器8により所定の
レベルまで増幅され、ダウンコンバータ9により所定の
周波数に変換され、ビーコン受信機10によりビーコン
信号が検出される。制御器11は、このビーコン信号を
入力し、基準値と比較して送信系のレベル制御器3,4
へ制御情報を送るためにレベル制御量を算出する。ここ
で基準値は晴天時ビーコン信号レベルを記憶している。
すなわち、降雨減衰を含む晴天時との差のレベルを算出
する。次に、このビーコン信号による降雨減衰量を
(1),(2)式に代入して降雨強度を求めた後に、前
述した特定の送信周波数について計算により減衰量Aを
求め、制御量データ25をレベル制御器3,4に印加し
て降雨減衰量の補正を行っていた。R = 0.1423-3.0976 × 10 −2 × f + 3.1174 × 10 −3 × f 2 −8.8328 × 10 −5 × f 3 + 8.9270 × 10 −7 × f 4 ( 2) The transmission power control for compensating the amount of rain attenuation in the uplink is performed using the above equations (1) and (2). As a configuration of such a conventional example, the configuration shown in FIG. 3 is used. ..
In FIG. 3, an input signal A to the transmission system is converted into a transmission frequency by an up converter 1 and level-controlled by a level controller 3 to output an RF signal 3A. The other input signal is converted into a transmission frequency by the up-converter 2 and level-controlled by the level controller 4 to generate the RF signal 4B.
Is output. The RF signals 3A and 4B are combined by the combiner 5 and the two transmission signals of different frequencies are commonly amplified to a predetermined level by the power amplifier 6 and transmitted from the antenna 7. Next, in the receiving system of the earth station, the beacon signal from the satellite is received by the antenna 7, amplified to a predetermined level by the low noise amplifier 8, converted to a predetermined frequency by the down converter 9, and beaconed by the beacon receiver 10. The signal is detected. The controller 11 inputs this beacon signal, compares it with a reference value, and transmits the level controllers 3 and 4 of the transmission system.
Calculate the level control amount to send control information to. Here, the reference value stores the beacon signal level in fine weather.
That is, the level of the difference from the time of fine weather including rain attenuation is calculated. Next, after substituting the rainfall attenuation amount by the beacon signal into the equations (1) and (2) to obtain the rainfall intensity, the attenuation amount A is calculated by the above-described specific transmission frequency, and the control amount data 25 is obtained. It was applied to the level controllers 3 and 4 to correct the amount of rainfall attenuation.
【0006】[0006]
【発明が解決しようとする課題】上述した従来の送信電
力制御方式は、送信ルートが周波数の異なる複数ルート
で構成される場合に、代表の送信周波数に対し、制御量
を算出し、他の送信周波数の送信ルートについては同一
の制御量を用いているので、周波数差による降雨減衰量
の補償誤差を発生するという欠点があった。In the above-described conventional transmission power control method, when the transmission route is composed of a plurality of routes having different frequencies, the control amount is calculated for a representative transmission frequency and the other transmission frequencies are calculated. Since the same control amount is used for the frequency transmission route, there is a drawback that a rain attenuation compensation error occurs due to the frequency difference.
【0007】本発明の目的は、複数の送信周波数の異な
る送信系に対し、それぞれ適正な制御量で送信電力制御
が可能な送信電力制御装置を提供することにある。An object of the present invention is to provide a transmission power control device capable of controlling transmission power with a proper control amount for a plurality of transmission systems having different transmission frequencies.
【0008】[0008]
【課題を解決するための手段】本発明の送信電力制御方
式は、衛星通信の地球局で、ビーコン受信機により受信
信号レベルを検出し、晴天時の受信レベルと比較して降
雨時の受信信号レベルの降雨減衰量を測定し、この降雨
減衰量と降雨強度と伝搬周波数の関係式にもとづき、ま
ず、降雨強度を求め、次にアップリンクの送信周波数を
代入して送信信号の降雨減衰補償量を算出して制御信号
を送出する制御器と、この制御信号を受信し制御信号に
比例したレベル制御を行なうレベル制御器とを備えた送
信電力制御方式において、前記制御器が複数の送信周波
数情報を入力して該当する各送信周波数に対応する複数
のレベル制御器に対し、前記関係式により得られた個別
の降雨減衰量を補償する制御信号を送出する。A transmission power control system of the present invention is a satellite communication earth station, in which a received signal level is detected by a beacon receiver and compared with a received signal level in fine weather to receive a received signal in rainfall. Level rain attenuation is measured, and based on this relational expression of rain attenuation, rain intensity and propagation frequency, first the rain intensity is calculated, and then the transmission frequency of the uplink is substituted and the rain attenuation compensation amount of the transmission signal is calculated. In a transmission power control system including a controller for calculating and transmitting a control signal, and a level controller for receiving the control signal and performing level control proportional to the control signal, the controller has a plurality of transmission frequency information. Is input to the plurality of level controllers corresponding to the corresponding transmission frequencies, and a control signal for compensating the individual rainfall attenuation amount obtained by the above relational expression is transmitted.
【0009】[0009]
【実施例】次に本発明について図面を参照して説明す
る。図1は本発明の第1の実施例のブロック図である。
図1において図3の従来例と同一の符号は同一の構成と
機能を有する。すなわち、本実施例では周波数制御器1
2の周波数データ14を周波数データ14Aのラインで
制御器11にも伝達している。また後述する第2の実施
例では、周波数データ14Aの代りに周波数データ14
Bのラインでレベル制御器3,4に直接伝達している。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the first embodiment of the present invention.
1, the same reference numerals as those in the conventional example of FIG. 3 have the same configuration and function. That is, in this embodiment, the frequency controller 1
The frequency data 14 of No. 2 is also transmitted to the controller 11 through the line of frequency data 14A. In the second embodiment described later, the frequency data 14A is used instead of the frequency data 14A.
It is directly transmitted to the level controllers 3 and 4 through the line B.
【0010】第1の実施例では制御器11は外部の周波
数制御器12から図2に示すアップコンバータ1,2の
アドレスを付記した周波数制御データ14を入力し、個
々の周波数に対応するレベル制御量を従来例で説明した
(1)式に基づいて計算する。最終的に送信周波数に対
応するレベル制御量を求め、図2(a)に示すアップコ
ンバータのアドレスを付記した制御量データ13の形式
でレベル制御器3,4へ送出する。レベル制御器3,4
は受信制御データ13が自己のアドレスと一致している
場合に、制御データを制御情報として受けて送信電力制
御を行なう。このようにして送信周波数が異なる複数の
送信波がある場合に、時間スケジュールで送信周波数が
変更になる運用形態においても送信周波数に一致したレ
ベル制御が可能である。In the first embodiment, the controller 11 inputs the frequency control data 14 with the addresses of the up-converters 1 and 2 shown in FIG. 2 from the external frequency controller 12, and controls the level corresponding to each frequency. The amount is calculated based on the equation (1) described in the conventional example. Finally, the level control amount corresponding to the transmission frequency is obtained and sent to the level controllers 3 and 4 in the form of the control amount data 13 with the address of the up converter shown in FIG. Level controller 3, 4
When the reception control data 13 matches its own address, the control data is received as control information to control the transmission power. In this way, when there are a plurality of transmission waves having different transmission frequencies, level control matching the transmission frequency is possible even in an operation mode in which the transmission frequency is changed according to the time schedule.
【0011】次に本発明の第2の実施例を図1のブロッ
ク図により説明する。前に説明したように第1の実施例
とほぼ同様であるが以下の点が異なる。制御器21は周
波数制御器12からの周波数制御データの入力機能はな
く、周波数データ14B(図の点線)のラインで図2
(b)に示すように特定送信周波数に対する制御データ
を従来例と同様にアドレスが付記されていないデータ2
5を送信する。したがって各レベル制御器22,23は
ともに同一データを受信するが図2(b)に示すように
周波数制御器12からのアドレス付きの周波数制御デー
タ14Bを入力し、この周波数と前述の特定周波数との
差からレベル制御器内で(1)式に基づいて制御データ
の補正を行ない送信電力制御を行なう。なお、本実施例
ではビーコン信号レベルを用いてレベル制御量を求める
場合を説明したが信号レベルの代わりにC/Nを用いて
レベル制御を求めることも可能である。Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG. As described above, it is almost the same as the first embodiment, except for the following points. The controller 21 does not have a function of inputting the frequency control data from the frequency controller 12, and the line of the frequency data 14B (dotted line in the figure) is used in FIG.
As shown in (b), the control data for the specific transmission frequency is data 2 in which no address is added as in the conventional example.
5 is transmitted. Therefore, both level controllers 22 and 23 receive the same data, but as shown in FIG. 2B, the frequency control data 14B with an address is input from the frequency controller 12, and this frequency and the above-mentioned specific frequency are input. From the difference between the two, the control data is corrected in the level controller based on the equation (1), and the transmission power control is performed. In the present embodiment, the case where the level control amount is obtained using the beacon signal level has been described, but it is also possible to obtain the level control using C / N instead of the signal level.
【0012】[0012]
【発明の効果】以上説明したように本発明の送信電力制
御方式は、ビーコン信号を用いた降雨減衰量をもとにア
ップリンクの送信制御方式を用いているが送信周波数が
異なる複数の送信波や時間スケジュールに従い送信周波
数が変化する運用形態においても実際の送信周波数に基
づくレベル制御を行なっているので、各送信周波数ごと
に降雨減衰量のレベル制御の精度を高めることができる
効果がある。As described above, the transmission power control method of the present invention uses the uplink transmission control method based on the rainfall attenuation amount using the beacon signal, but a plurality of transmission waves having different transmission frequencies are used. Since the level control based on the actual transmission frequency is performed even in the operation mode in which the transmission frequency changes according to the time schedule, there is an effect that the accuracy of the level control of the rainfall attenuation amount can be improved for each transmission frequency.
【図1】本発明の第1および第2の実施例のブロック図
である。FIG. 1 is a block diagram of first and second embodiments of the present invention.
【図2】第1および第2の実施例のそれぞれの信号の説
明図である。FIG. 2 is an explanatory diagram of respective signals of the first and second embodiments.
【図3】従来の送信電力制御方式のブロック図である。FIG. 3 is a block diagram of a conventional transmission power control method.
1,2 アップコンバータ 3,4 レベル制御器 5 合成器 6 電力増幅器 7 アンテナ 8 低雑音増幅器 9 ダウンコンバータ 10 ビーコン受信機 11 制御器 12 周波数制御器 13 制御量データ 14 周波数データ 14A,14B 第1と第2の実施例の周波数データ
ライン。1, 2 up converter 3, 4 level controller 5 combiner 6 power amplifier 7 antenna 8 low noise amplifier 9 down converter 10 beacon receiver 11 controller 12 frequency controller 13 control amount data 14 frequency data 14A, 14B 1st and The frequency data line of the second embodiment.
Claims (2)
より受信信号レベルを検出し、晴天時の受信レベルと比
較して降雨時の受信信号レベルの降雨減衰量を測定し、
この降雨減衰量と降雨強度と伝搬周波数の関係式にもと
づき、まず、降雨強度を求め、次にアップリンクの送信
周波数を代入して送信信号の降雨減衰補償量を算出して
制御信号を送出する制御器と、この制御信号を受信し制
御信号に比例したレベル制御を行なうレベル制御器とを
備えた送信電力制御方式において、前記制御器が複数の
送信周波数情報を入力して該当する各送信周波数に対応
する複数のレベル制御器に対し、前記関係式により得ら
れた個別の降雨減衰量を補償する制御信号を送出するこ
とを特徴とする送信電力制御方式。1. In a satellite communication earth station, a received signal level is detected by a beacon receiver, and the amount of rainfall attenuation of the received signal level during rainfall is measured by comparing with the received level during fine weather,
Based on this relational expression of rainfall attenuation, rainfall intensity, and propagation frequency, first calculate the rainfall intensity, then substitute the uplink transmission frequency to calculate the rainfall attenuation compensation amount of the transmission signal and send the control signal. In a transmission power control system including a controller and a level controller that receives the control signal and performs level control proportional to the control signal, the controller inputs a plurality of transmission frequency information and each corresponding transmission frequency To a plurality of level controllers corresponding to the above, a control signal for compensating the individual rainfall attenuation amounts obtained by the above relational expression is sent out.
報および送信ルート情報を前記制御器の代りに直接入力
して前記関係式にもとずき、前記制御器から入力された
特定周波数に対する制御信号に補正を行ない各送信周波
数に対応する降雨減衰量の制御信号を求めることを特徴
とする請求項1記載の送信電力制御方式。2. The plurality of level controllers directly input transmission frequency information and transmission route information instead of the controller, and based on the relational expression, control for a specific frequency input from the controller. 2. The transmission power control method according to claim 1, wherein the signal is corrected to obtain a control signal of rainfall attenuation corresponding to each transmission frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2084792A JPH05218924A (en) | 1992-02-06 | 1992-02-06 | Transmission power control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2084792A JPH05218924A (en) | 1992-02-06 | 1992-02-06 | Transmission power control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05218924A true JPH05218924A (en) | 1993-08-27 |
Family
ID=12038479
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2084792A Withdrawn JPH05218924A (en) | 1992-02-06 | 1992-02-06 | Transmission power control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05218924A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007214980A (en) * | 2006-02-10 | 2007-08-23 | Mitsubishi Electric Corp | Satellite communication system |
JP2015173355A (en) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | satellite communication apparatus and transmission power control method |
JP2015173356A (en) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | Satellite communication device and transmission power control method |
-
1992
- 1992-02-06 JP JP2084792A patent/JPH05218924A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007214980A (en) * | 2006-02-10 | 2007-08-23 | Mitsubishi Electric Corp | Satellite communication system |
JP2015173355A (en) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | satellite communication apparatus and transmission power control method |
JP2015173356A (en) * | 2014-03-11 | 2015-10-01 | 株式会社東芝 | Satellite communication device and transmission power control method |
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