JPS6161531A - Frequency control system - Google Patents
Frequency control systemInfo
- Publication number
- JPS6161531A JPS6161531A JP18165584A JP18165584A JPS6161531A JP S6161531 A JPS6161531 A JP S6161531A JP 18165584 A JP18165584 A JP 18165584A JP 18165584 A JP18165584 A JP 18165584A JP S6161531 A JPS6161531 A JP S6161531A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- frequency
- frequency control
- satellite
- repeater
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/2043—Mixed mode, TDM and FDM systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
ｓｃｐｃ多元接続方式を用いたマルチビーム構成の衛星
通信における周波数制御方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a frequency control method in multi-beam satellite communication using an SCPC multiple access method.
（従来の技術）
第２図は従来のシングルビームの場合の、５ｃｐｃ（Ｓ
ｉｎｇｌｅ ｃｈａｎｎｅｌ ｐｅｒ ｃａｒｒｌｅｒ
）方式における周波数制御の構成例である。α３）は
衛星中継器の構成、（２４）は基地局、Ｃ３２は加入者
局の無線系の構成を示す。(Prior art) Figure 2 shows a conventional single beam with 5 cpc (S).
ingle channel per carrler
) is a configuration example of frequency control in the system. α3) indicates the configuration of the satellite repeater, (24) indicates the base station, and C32 indicates the configuration of the wireless system of the subscriber station.
基地局のｃ！３）は周波数制御釦用いる擬似加入者局の
無線系を示し、□□□の基地局無線系はｆ１〜ｆｎの無
線チャネルを有し基地局〜衛星間はＦ、衛星・加入者間
は伝ばん損失の比較的少ないＦ′の無線周波数帯を使用
する。無線周波数の主な変動要因は衛星中継器系の周波
数変換器（１１）、 ａ’；：ｔの局部発振器（４）。Base station c! 3) shows the radio system of a pseudo subscriber station that uses a frequency control button, and the base station radio system of □□□ has radio channels f1 to fn, F between the base station and the satellite, and F between the satellite and the subscriber. The radio frequency band F', which has relatively low band loss, is used. The main fluctuation factors in the radio frequency are the frequency converter (11) of the satellite repeater system and the local oscillator (4) of a';:t.
（５）の不安定さと、基地局無線系の送信及び受信用局
部発振器の不安定さである。基地局と多数の加入者局と
の間で数ｋｂ／ｓから数十ｋ ｂ／ｓの低速度の信号を
伝送するＳＣＰＣ衛星通信方式では、復調回路を安定に
動作させるために到来波の周波数変動量を許容値以下に
補正する必要がある。その一つの方法として従来では、
基地局送り、加入者局受信の系では「１〜ｆｎの無線チ
ャネルの内特定のｆｎ−ｉを周波数制御専用チャネルと
し、口の無線チャネル合波器で他の無線チャネルと合波
して、（２０）の周波数変換器で周波数Ｆに変換し、Ｇ
６）の送信機、（１９の送受共用器及び基地局アンテナ
系を経て０３）の衛星中継器へ送信する。衛星では（１
１のマルチビームアンテナ系で受信した無線周波数Ｆを
（２）のＦ波送受共用器で分離して（３）の中継器用受
信器で受信する。受信した周波数を（１１）のＦ −＋
Ｆ／変換器で１２′に変換して（５）のＦ′波帯送信
機、（６）のＦ′波帯送受共器（７）のマルチビームア
ンテナを経て加入者局送信する。基地局に在る擬似加入
者局用無線機では（１＝υの加入者局用アンテナ、（Ｉ
５）の送受共用器を経てＧ９の受信器でＦ′波を受信し
く２■の周波数変換器でパイロットチャネル用周波数ｆ
ｎ ｉを出力する。ｅυの下り周波数誤差検出回路で
は（２渇の基準周波数発振器出力とパイロットチャネル
用周波数ｆｎ−ｉとの誤差を検出し、基地局無線装置送
信用局部発振１１ 器（２８）を制御し加
入者局受信の無線周波数■“′が所定の偏差内で受信さ
れるようにする。加入者局送信の場合、（２３）の擬似
加入者局用無線機００印のパイロットチャネル用層波数
ｆｈ−ｉ波発生回路より出力し、αηの送信周波数変換
器でｆ’ｌ−ｉのチャネルをＦ′に変換しく１６）の送
信機、霞の送受共用器、α（１）の加入者局アンテナを
経て衛星に送信する。（１３）の衛星中継器では受信し
た２波帯は（８）のＦ′波帯受信機、ａりのＦ／−Ｆ周
波帯同波変換器及び、（１０）の送信機を経て地上へ送
信する。無線基地局では受信したｆｆ１＝ｉの周波数と
擬似加入者局用無線機が送信したｆｈ−ｉ波を比較し、
（２９）の下り周波数誤差検出回路で誤差周波数を検出
しく３０）の受信周波数変換器の局部発振器Ｃ３１）を
制御しｆ’ｎ−ｉの周波数誤差が所定の値になるように
制御する。(5) instability and the instability of the local oscillator for transmitting and receiving in the base station wireless system. In the SCPC satellite communication system, which transmits low-speed signals of several kb/s to several tens of kb/s between a base station and a large number of subscriber stations, the frequency of the incoming wave is It is necessary to correct the amount of variation to below the allowable value. Conventionally, one method is to
In the base station transmission and subscriber station reception system, "among the radio channels 1 to fn, a specific fn-i is designated as a channel dedicated to frequency control, and is multiplexed with other radio channels using a radio channel multiplexer at the base. Convert to frequency F using the frequency converter (20), and
The signal is transmitted to the satellite repeater (03) via the transmitter (6), the duplexer (19), and the base station antenna system. In the satellite (1
The radio frequency F received by the multi-beam antenna system (1) is separated by the F-wave duplexer (2) and received by the repeater receiver (3). The received frequency is F −+ of (11)
The signal is converted to 12' by an F/converter and transmitted to the subscriber station via the F' wave band transmitter (5) and the multi-beam antenna of the F' wave band transmitter/receiver (7) (6). In the base station's pseudo subscriber station radio, (1=υ subscriber station antenna, (I
The F' wave is received by the G9 receiver via the transmitter/receiver in 5).The frequency converter in 2) converts the pilot channel frequency f.
Output n i. The downlink frequency error detection circuit of eυ detects the error between the reference frequency oscillator output of (2) and the pilot channel frequency fn-i, controls the local oscillator (28) for transmitting the base station radio equipment, and transmits the signal to the subscriber station. Ensure that the receiving radio frequency is received within a predetermined deviation.In the case of subscriber station transmission, the pilot channel layer wave number fh-i wave of the pseudo subscriber station radio 00 mark in (23) The signal is output from the generator circuit, and the channel f'l-i is converted to F' by the transmission frequency converter αη, and sent to the satellite via the transmitter 16), the duplexer Kasumi, and the subscriber station antenna α(1). The two wave bands received by the satellite repeater (13) are transmitted to the F' wave band receiver (8), the F/-F frequency band converter (a), and the transmitter (10). The radio base station compares the received frequency of ff1=i with the fh-i wave transmitted by the pseudo subscriber station radio,
The downlink frequency error detection circuit (29) detects the error frequency and controls the local oscillator C31) of the reception frequency converter (30) so that the frequency error of f'ni becomes a predetermined value.
このような制御を行うことにより基地局〜衛星〜擬似加
入者局間の無線周波数の不安定さを除去することができ
る。残る不安定さは加入者局（３ツの送信系（２）及び
受信系顛の共通局部発振器３９）の基準発振器（４１）
の安定度であるが、安定度を高めることにより復調回路
の安定動作を維持することが可能であり必要ならば加入
者局毎に周波数制御回路を具備することになる。By performing such control, instability in the radio frequency between the base station, the satellite, and the pseudo subscriber station can be eliminated. The remaining instability is caused by the reference oscillator (41) of the subscriber station (common local oscillator 39 for the three transmitting systems (2) and the receiving system).
However, by increasing the stability, it is possible to maintain stable operation of the demodulation circuit, and if necessary, a frequency control circuit may be provided for each subscriber station.
このようにして、シングルビームでは（２４）の基地局
を１局設けることによって基地局−加入者局間の周波数
制御が可能であった。In this way, in the single beam system, frequency control between the base station and the subscriber station was possible by providing one base station (24).
（発明が解決しようとする問題点）
しがし、サービス地域を複数のビームで照射するマルチ
ビーム衛星通信方式ではビーム毎に第２図の０３）に示
す周波変換器からなる衛星中継器をビーム毎に設ける必
要がある。第３図は３ビーム構成の場合の衛星中継系の
構成例である。衛星中継の局部発振器（４）、（９）が
中継器毎に独立に設置される場合第２図に示す（２４）
の基地局が各ビーム設置し、中継毎に周波数制御を行う
必要がある。しかし、サービスを船舶を対象にした場合
ビーム構成の上から海上がサービスエリアとなり周波数
制御を行う基地局が設置できないビーム（３３ｂ ）、
（３３ｃ）が考えられる。(Problem to be solved by the invention) However, in a multi-beam satellite communication system that illuminates a service area with multiple beams, a satellite repeater consisting of a frequency converter shown in 03 in Figure 2 is used for each beam. It is necessary to provide one for each. FIG. 3 shows an example of the configuration of a satellite relay system in the case of a three-beam configuration. When local oscillators (4) and (9) for satellite relay are installed independently for each repeater, the case shown in Figure 2 (24)
It is necessary to install base stations for each beam and perform frequency control for each relay. However, when the service is targeted at ships, the beam configuration means that the sea is the service area, and a base station for frequency control cannot be installed on the beam (33b).
(33c) is possible.
本発明は上記欠点を改善するものである。The present invention aims to improve the above-mentioned drawbacks.
（問題点を解決するための手段）
本発明の特徴は、衛星中継系の局部発振器を共通にして
代表するビームの基地局で全ビームの周波数制御を行う
ようにしたことにある。(Means for Solving the Problems) A feature of the present invention is that the satellite relay system uses a common local oscillator, and the frequency control of all beams is performed at the base station of a representative beam.
（作 用）
衛星中継器の局部発振器を共通化したので、従来のごと
くビーム毎に基地局をもうける必要がなく、代表する基
地局で全てのビームの周波数制御を行うことができる。(Function) Since the local oscillator of the satellite repeater is shared, there is no need to create a base station for each beam as in the past, and a representative base station can control the frequency of all beams.
（実施例）
第１図は本発明の３ビームの場合の衛星中継系の構成例
である。各ビームの中継系毎の局部発振器を上り（移動
局→基地局）、下り（基地局→移動局）それぞれ共通に
（３６）、Ｇ５１を設置する構成とし、その局部発振器
出力を（３４ａ）、 （３４ｂ）の分配器でそれぞれの
中継系に供給する。上り、下り中継系の局部発振器を共
通局部発振器構成にすることにより各中継系の周波数変
動が同一となり、第１図に示した従来の周波数制御法で
周波数制御することにより、基地局１局で第３図に示す
衛星中継系３系統の周波数変動に対する制御が可能とな
る。(Embodiment) FIG. 1 is a configuration example of a satellite relay system in the case of three beams according to the present invention. The local oscillator for each relay system of each beam is configured to have G51 installed in common for uplink (mobile station → base station) and downlink (base station → mobile station) (36), and the local oscillator output is (34a), The distributor (34b) supplies each relay system. By using a common local oscillator configuration for the local oscillators of the uplink and downlink relay systems, the frequency fluctuation of each relay system becomes the same, and by controlling the frequency using the conventional frequency control method shown in Figure 1, it is possible to It becomes possible to control frequency fluctuations in the three satellite relay systems shown in FIG.
すなわち、サービスエリアを複数ビームで照射し、周波
数制御が不可欠な５ｃｐｃ方式において、複数ビームの
内基地局設置に都合のよい所定の１ビームに１基地局を
設置し複数ビームの周波数制御を行うことができる。In other words, in the 5cpc method in which a service area is irradiated with multiple beams and frequency control is essential, one base station is installed on a predetermined beam among the multiple beams that is convenient for installing a base station, and the frequency of multiple beams is controlled. I can do it.
以上サービスエリアを複数ビームで照射するマルチビー
ム構成において衛星のビーム対応の中継器系の局部発振
器を共通に設置する構成とし、所定のど−ムに設置され
た１基地局で周波数制御機能式について説明した。The above explains the frequency control function formula for one base station installed in a predetermined dome, with a multi-beam configuration that illuminates the service area with multiple beams, in which the local oscillator of the repeater system corresponding to the satellite beam is installed in common. did.
また、システノ・信頼度の向上を図るため基地局無線系
は複数局設置しバンクアップ構成とする場合が一般的で
あるが、その場合第２図に示すようにビームエリア（３
３ａ）の基地局で周波数制御を行い、バンクアンプ局に
は（４りのデータ回線を介して周波数制御情報を伝送し
、ビームエリア（３３ｂ）の基地局無線系の周波数制御
をビームエリア（３３ａ）の基地局から行う構成にする
ことにより、各基地局に擬似加入者局など周波数制御を
行う機能を設電
置する必要がなく、基地局の経済化に寄与する。In addition, in order to improve system reliability, it is common to install multiple base station wireless systems in a bank-up configuration, but in this case, the beam area (3
The base station (3a) performs frequency control, transmits frequency control information to the bank amplifier station (4) via the data line, and controls the frequency of the base station radio system in the beam area (33b) to the beam area (33a). ), there is no need to install a frequency control function such as a pseudo subscriber station in each base station, contributing to the economicalization of base stations.
（発明の効果）
以上説明した衛星に複数の中継器が必要なマルチビーム
通信方式では、従来方式の場合中継器毎に周波数制御を
行う必要がありビームによってはビーム領域が海上とな
り周波数変換器う基地局の設置が不可能な場合でも、周
波数制御が可能となる。(Effects of the Invention) In the multi-beam communication system that requires multiple repeaters on a satellite as described above, in the conventional system, it is necessary to perform frequency control for each repeater, and depending on the beam, the beam area may be over the ocean and the frequency converter may be required. Frequency control becomes possible even when it is impossible to install a base station.
また、周波数制御を行う基地局は最低１局でよく、経済
的なシステム構成に寄与する。衛星の局部発振器を共通
にすることにより衛星搭載のノ・−ドが簡略化される。Furthermore, at least one base station is required to perform frequency control, contributing to an economical system configuration. By making the satellite's local oscillator common, the nodes onboard the satellite can be simplified.
また、基地局が複数の場合各基他局に周波数制御機能を
設ける必要がなく基地局の経済化に寄与する。Furthermore, when there are a plurality of base stations, there is no need to provide a frequency control function for each base station, contributing to the economicalization of base stations.
第１図は本発明による衛星中継器の構成例、第２図は従
来の周波数制御の構成例、第３図は３ビーム構成の場合
の従来の衛星中継器の構成例である。
（１）・・・マルチビームアンテナ系、（２）・・・Ｆ
波帯送受共用器、（３）・・・中継器用受信器、（４）
・・・中継器用局部発振器、（５）・・・Ｆ′波帯送信
機、（６）・・・２波帯送受共用器、（７）・・・マル
チビームアンテナ系、（８）Ｐ波帯受信器、（９）・・
・局部発振器、（１０）・・・Ｆ波帯送信機、■・・・
Ｆ −＋ Ｆ／周波数変換器、ａｚ・・・Ｆ′→Ｆ周波
数変換器、０３）・・・衛星中継器、（１４）・・・加
入者局アンテナ、（１９・・・送受共用器、（１６）・
・・送信機、（１７）・・・送信周波数変換器、（１帽
・・パイロットチャネル用周波ｐ ｆｆ１− ｉ発生回
路、α帽・・受信器、（２０）・・・周波数変換器、（
２１１・・・下り周波数誤差検出回路、（２り・・・基
準周波数発振器、（ハ）・・・擬似加入者局用無線機、
（２４）・・・基地局、（ハ）・・・基地局アンテナ系
、（２６）・・・パイロットチャネル側周波数ｆｎ−ｉ
発生回路、（２７）・・・基地無線系、（２８１・・・
基地局無線装置送信用局部発振器、（２９）・・・上り
周波数誤差検出回路、（３０）・・・受信周波数変換器
、（３１）・・・受信用局部発振器、（３カ・・・加入
者局、（３３）・・・ビームエリア、０４）・・・分配
器、（３９・・・下り中継器系用局部発振器、０６）・
・・上り中継器系用局部発振器、噌・・・無線チャネル
合波器、（２）・・・加入者局送信系、０！ｌ）・・・
共通局部発振器、（４０）・・・加入者局受信系、（４
１）・・・加入者局基準発振器、（４Ｚ・・・データ回
路。
第２図
（Ａ）、＠
第３図FIG. 1 shows an example of the configuration of a satellite repeater according to the present invention, FIG. 2 shows an example of a conventional frequency control structure, and FIG. 3 shows an example of the structure of a conventional satellite repeater with a three-beam configuration. (1)...Multi-beam antenna system, (2)...F
Waveband transmitter/receiver, (3)... Receiver for repeater, (4)
...Local oscillator for repeater, (5)...F' wave band transmitter, (6)...2 wave band duplexer, (7)...Multi-beam antenna system, (8) P wave Band receiver, (9)...
・Local oscillator, (10)...F wave band transmitter, ■...
F −+ F/frequency converter, az...F'→F frequency converter, 03)...Satellite repeater, (14)...Subscriber station antenna, (19...Transmission/reception duplexer, (16)・
...Transmitter, (17)...Transmission frequency converter, (1 cap...Pilot channel frequency pff1-i generation circuit, α cap...Receiver, (20)...Frequency converter, (
211... Downlink frequency error detection circuit, (2... reference frequency oscillator, (c)... pseudo subscriber station radio equipment,
(24)...Base station, (c)...Base station antenna system, (26)...Pilot channel side frequency fn-i
Generation circuit, (27)...Base radio system, (281...
Base station wireless device transmitting local oscillator, (29)...uplink frequency error detection circuit, (30)...receiving frequency converter, (31)...receiving local oscillator, (3 components...added) (33)... Beam area, 04)... Distributor, (39... Local oscillator for downlink repeater system, 06)
...Local oscillator for uplink repeater system, 噌...Radio channel multiplexer, (2)...Subscriber station transmission system, 0! l)...
Common local oscillator, (40)...Subscriber station receiving system, (4
1)...Subscriber station reference oscillator, (4Z...data circuit. Figure 2 (A), @ Figure 3
Claims (1)
構成のＳＣＰＣ（Ｓｉｎｇｌｅ ｃｈａｎｎｅｌ ｐｅ
ｒ ｃａｒｒ−ｉｅｒ）衛星通信方式において、衛星上
にビーム対応に設置される中継器に供給する局部発振周
波数の発振器を全ビームに共通に設置し、複数ビームエ
リアの内所定のビームエリアに設けた、周波数制御用擬
似加入者局を有する基地局により、複数ビームの周波数
制御を行い、基地局が複数の場合周波数制御機能を有す
る基地局が自局の制御情報に従って、周波数制御機能を
有しない他の基地局の周波数制御をデータ回線を介して
行うことを特徴とする周波数制御方式。SCPC (Single Channel PE) has a multi-beam configuration that illuminates the service area with multiple beams.
r carr-ier) In the satellite communication system, an oscillator with a local oscillation frequency that supplies the repeaters installed on the satellite corresponding to each beam is installed in common for all beams, and is installed in a predetermined beam area among multiple beam areas. , a base station with a pseudo subscriber station for frequency control performs frequency control of multiple beams, and when there are multiple base stations, a base station with a frequency control function follows its own control information, and other base stations do not have a frequency control function. A frequency control method characterized by controlling the frequency of a base station via a data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18165584A JPS6161531A (en) | 1984-09-01 | 1984-09-01 | Frequency control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18165584A JPS6161531A (en) | 1984-09-01 | 1984-09-01 | Frequency control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6161531A true JPS6161531A (en) | 1986-03-29 |
Family
ID=16104542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18165584A Pending JPS6161531A (en) | 1984-09-01 | 1984-09-01 | Frequency control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6161531A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04281626A (en) * | 1991-03-08 | 1992-10-07 | Nippon Telegr & Teleph Corp <Ntt> | Satellite mount repeater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58143638A (en) * | 1982-02-22 | 1983-08-26 | Nippon Telegr & Teleph Corp <Ntt> | Direction controlling system of satellite antenna |
-
1984
- 1984-09-01 JP JP18165584A patent/JPS6161531A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58143638A (en) * | 1982-02-22 | 1983-08-26 | Nippon Telegr & Teleph Corp <Ntt> | Direction controlling system of satellite antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04281626A (en) * | 1991-03-08 | 1992-10-07 | Nippon Telegr & Teleph Corp <Ntt> | Satellite mount repeater |
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