JPH06326640A - Earth receiving station device for satellite communication - Google Patents
Earth receiving station device for satellite communicationInfo
- Publication number
- JPH06326640A JPH06326640A JP6434494A JP6434494A JPH06326640A JP H06326640 A JPH06326640 A JP H06326640A JP 6434494 A JP6434494 A JP 6434494A JP 6434494 A JP6434494 A JP 6434494A JP H06326640 A JPH06326640 A JP H06326640A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- receiver
- signal
- receivers
- control
- 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.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 4
- 230000011664 signaling Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Landscapes
- Radio Relay Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、衛星中継局で中継され
て送出される信号を受信する衛星通信地球受信局装置に
関し、特にそのＡＦＣ（自動周波数制御）及びＡＧＣ
（自動利得制御）に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite communication earth receiving station apparatus for receiving a signal which is relayed and transmitted by a satellite relay station, and more particularly to its AFC (Automatic Frequency Control) and AGC.
(Automatic gain control)
【０００２】[0002]
【従来の技術】衛星通信に使用されるＳＣＰＣ（Ｓｉｎ
ｇｌｅ Ｃｈａｎｎｅｌ ＰｅｒＣａｒｒｉｅｒ）方式
の周波数配列は、４５ｋＨｚの周波数間隔で音声チャネ
ルが配列されており、周波数間隔４５ｋＨｚは、これら
のチャネルが送信されるＧＨｚ（ギガヘルツ）帯の無線
周波数に対しては極めて狭く、且つ地球受信局における
復調はＰＳＫ（Ｐｈａｓｅ Ｓｈｉｆｔ Ｋｅｙｉｎ
ｇ）変調の復調となり同期検波が必要となるので、受信
における周波数精度については極めて厳密な要求があ
る。2. Description of the Related Art SCPC (Sin) used for satellite communication
In the frequency array of the gle Channel PerCarrier) method, voice channels are arrayed at a frequency interval of 45 kHz, and the frequency interval of 45 kHz is extremely narrow with respect to the radio frequency in the GHz (GHz) band in which these channels are transmitted. In addition, demodulation at the earth receiving station is performed by PSK (Phase Shift Keyin).
g) Since it becomes demodulation of modulation and requires synchronous detection, there is an extremely strict requirement for frequency accuracy in reception.
【０００３】更に、ＳＰＡＤＥ（ＳＣＰＣ ＰＣＭ ｍ
ｕｌｔｉ Ａｃｃｅｓｓ Ｄｅ−ｍａｎｄ ａｓｓｉｇ
ｎｍｅｎｔ Ｅｑｕｉｐｍｅｎｔ）方式では、通信連絡
を行うためのＣＳＣ（ｃｏｍｍｏｎ ｓｉｇｎａｌｌｉ
ｎｇ ｃｈａｎｎｅｌ）が制御地球局から衛星を中継し
て常時送出されている。ＣＳＣは制御地球局からそのグ
ループに属する地球受信局への通信連絡（例えばチャネ
ルの割り当て（ａｓｓｉｇｎｍｅｎｔ））の送信に使用
される。なお、ＣＳＣはＡＦＣの便宜のため連続波とし
て送出されるが、他の全ての通信チャネルは、バースト
（ｂｕｒｓｔ）波により送出される。In addition, the SPADE (SCPC PCM m
ulti access de-mand assig
In the Ment Equipment system, a CSC (common signal) for making communication contact.
ng channel) is constantly transmitted from the controlling earth station by relaying satellites. The CSC is used to send communication communications (eg channel assignments) from the controlling earth station to earth receiving stations belonging to the group. Note that CSC is sent as a continuous wave for convenience of AFC, but all other communication channels are sent as a burst wave.
【０００４】図２は従来の地球受信局の構成を示すブロ
ック図であって、アンテナ１で受信した無線周波数（Ｇ
Ｈｚ帯）の信号は、第１周波数変換器２により第１中間
周波数の信号に変換され、分配器３を介して制御受信機
５とチャネル受信機６に分配される。制御受信機５とチ
ャネル受信機６とは、その構成部分に同一の部分が多
く、これら同一の部分は同一符号で表すが、区別の必要
があるときはその部分を表す符号の後部に当該部分の属
する受信機の符号をハイフンで接続する。例えば、符号
４１−５は制御受信機５内の第２中間周波増幅器４１を
表す。FIG. 2 is a block diagram showing a configuration of a conventional earth receiving station, in which the radio frequency (G
The signal of the Hz band) is converted into a signal of the first intermediate frequency by the first frequency converter 2, and is distributed to the control receiver 5 and the channel receiver 6 via the distributor 3. The control receiver 5 and the channel receiver 6 often have the same parts in their constituent parts, and these same parts are represented by the same reference numerals. Connect the receiver code that belongs to with a hyphen. For example, reference numeral 41-5 represents the second intermediate frequency amplifier 41 in the control receiver 5.
【０００５】制御受信機５はＣＳＣを受信しこのＣＳＣ
の搬送周波数に位相同期した第１局部発振周波数を発生
して第１周波数変換器２に供給する。例えば、ＣＳＣの
搬送波周波数における周波数をＦprとし、第１局部発振
器（ＶＣＯ４４）の周波数をＦ1 とすると、第１周波数
変換器２の出力点では搬送波周波数はＦpr−Ｆ1 に変換
される。制御受信機５の周波数シンセサイザ４８が周波
数ｆ2pの第２局部発振周波数を出力しているとすると、
第２中間周波増幅器４１の入力点ではＣＳＣの搬送波周
波数はＦpr−Ｆ1 −ｆ2pとなる。第２中間周波増幅器４
１の中心周波数をＦ2 とすると、Ｆpr−Ｆ1 −ｆ2p＝Ｆ
2 ・・・・（１）となるようにｆ2pを設定すると、ＣＳ
Ｃ信号は増幅されて復調部４２に供給される。The control receiver 5 receives the CSC and receives the CSC.
The first local oscillation frequency that is phase-synchronized with the carrier frequency is generated and supplied to the first frequency converter 2. For example, when the frequency at the carrier frequency of CSC is F pr and the frequency of the first local oscillator (VCO 44) is F 1 , the carrier frequency is converted to F pr −F 1 at the output point of the first frequency converter 2. . Assuming that the frequency synthesizer 48 of the control receiver 5 outputs the second local oscillation frequency of the frequency f 2p ,
At the input point of the second intermediate frequency amplifier 41, the carrier frequency of CSC is F pr -F 1 -f 2p . Second intermediate frequency amplifier 4
If the center frequency of 1 is F 2 , then F pr −F 1 −f 2p = F
2 ... If f 2p is set to be (1), CS
The C signal is amplified and supplied to the demodulation unit 42.
【０００６】復調部４２では周波数Ｆ2 の信号に対する
位相検波が行われ、Ｆ1 に周波数偏差があると、それは
第２中間周波数増幅器４１−５の出力における周波数偏
差となって現れ、復調部４２で位相誤差として検出さ
れ、この位相誤差がローパスフィルタ４３を介してＶＣ
Ｏ４４を制御し、ＶＣＯ４４の出力Ｆ1 をＣＳＣの搬送
波周波数Ｆprに対し式（１）の関係を保って位相ロック
する。すなわち、位相ロックループはＶＣＯ４４−第１
周波数変換器２−第２周波数変換器４０−第２中間周波
増幅器４１−復調部４２−ローパスフィルタ４３−ＶＣ
Ｏ４４で構成されるが、この位相ロックループの引き込
み範囲は極めて狭いのでＶＣＯ４４としては周波数精度
の良い水晶発振器が用いられる。また、第２中間周波増
幅器４１−５の出力レベルがレベル検出部４５で検出さ
れ、このレベル検出部の出力が第１周波数変換器２の利
得をフィードバック制御する信号として供給される。In the demodulation section 42, phase detection is performed on the signal of the frequency F 2 , and if there is a frequency deviation in F 1 , it appears as a frequency deviation in the output of the second intermediate frequency amplifier 41-5, and the demodulation section 42. Is detected as a phase error by the
By controlling O44, the output F 1 of the VCO 44 is phase-locked while maintaining the relationship of the expression (1) with respect to the carrier frequency F pr of the CSC. That is, the phase locked loop is VCO44-first
Frequency converter 2-Second frequency converter 40-Second intermediate frequency amplifier 41-Demodulator 42-Low-pass filter 43-VC
Although it is composed of O44, the pull-in range of this phase-locked loop is extremely narrow, so that a crystal oscillator with high frequency accuracy is used as the VCO 44. Further, the output level of the second intermediate frequency amplifier 41-5 is detected by the level detecting section 45, and the output of this level detecting section is supplied as a signal for feedback controlling the gain of the first frequency converter 2.
【０００７】チャネル受信機６が無線周波数Ｆcrを受信
するとき、第２周波数変換器４０−６の入力点ではその
チャネル周波数はＦcr−Ｆ1 となり、周波数シンセサイ
ザ４８−６を周波数ｆ2cに設定し、Ｆcr−Ｆ1 −ｆ2c＝
Ｆ2 ・・・・（２）になるようにすれば、Ｆcrのチャネ
ル周波数を正確に受信することができる。式（１），
（２）から、Ｆpr−Ｆcr＝ｆ2p−ｆ2cになるように周波
数シンセサイザ４８の周波数を設定するだけで、チャネ
ル受信機６においてはＡＦＣ，ＡＧＣは必要ない。When the channel receiver 6 receives the radio frequency F cr , the channel frequency becomes F cr −F 1 at the input point of the second frequency converter 40-6, and the frequency synthesizer 48-6 is changed to the frequency f 2c . Set F cr -F 1 -f 2c =
If F 2 ... (2) is set, the channel frequency of F cr can be accurately received. Formula (1),
From (2), it is only necessary to set the frequency of the frequency synthesizer 48 so that F pr −F cr = f 2p −f 2c , and the channel receiver 6 does not need AFC and AGC.
【０００８】チャネル受信機６も常時ＣＳＣを待ち受け
ており、ＣＳＣにより受信周波数が指定されると、その
指定は復調部４２を経てデータ処理部４６に入力され、
データ処理部４６は論理部４７−６を制御して周波数シ
ンセサイザ４８−６の周波数を指定された受信周波数に
対応する周波数に設定する。地球受信局で同時に受信す
るチャネル数が増加あると、図３に示すようにチャネル
受信機６の台数を増加して対応する。The channel receiver 6 is also always waiting for CSC, and when the reception frequency is designated by the CSC, the designation is input to the data processing unit 46 via the demodulation unit 42,
The data processing unit 46 controls the logic unit 47-6 to set the frequency of the frequency synthesizer 48-6 to the frequency corresponding to the designated reception frequency. If the number of channels simultaneously received by the earth receiving station is increased, the number of channel receivers 6 is increased as shown in FIG.
【０００９】[0009]
【発明が解決しようとする課題】以上のような従来の地
球受信局では制御受信機が１台だけのため、この制御受
信機が故障するとその地球受信局全体の動作が停止する
という問題がある。この問題を避けるために制御受信機
に予備を設けると、常用の制御受信機に故障がない間は
予備の制御受信機は全く無駄な存在になる。本発明の目
的は、従来のものにおけるこのような問題点を解決し、
制御受信機が故障した場合にも当該地球受信局の動作が
停止することのない衛星通信地球受信局装置を提供する
ことを目的としている。Since the conventional earth receiving station as described above has only one control receiver, there is a problem that the operation of the earth receiving station as a whole stops when the control receiver fails. . If a spare control receiver is provided in order to avoid this problem, the spare control receiver is completely useless as long as the regular control receiver has no failure. The object of the present invention is to solve such problems in the conventional one,
It is an object of the present invention to provide a satellite communication earth receiving station device in which the operation of the earth receiving station does not stop even if the control receiver fails.
【００１０】[0010]
【課題を解決するための手段】本発明に係わる衛星通信
地球受信局装置は、制御受信機としてもチャネル受信機
としても使用することができる受信機を複数台備える構
成とした。すなわち、衛星中継局から送信される信号を
第１中間周波数の信号に変換する広帯域周波数変換器、
この広帯域周波数変換器の出力を入力し、連続的に送出
されるＣＳＣ信号を受信し、このＣＳＣの搬送周波数に
対して位相ロックされた第１局部発振周波数を生成して
第１周波数変換器に供給する制御受信機として、又はバ
ースト信号として送出される任意の通信チャネルを受信
するチャネル受信機として動作する複数台の受信機、複
数台の受信機のうちの１台の受信機を制御受信機として
動作させ、その他をチャネル受信機として動作させる手
段、を備えたことを特徴とする。The satellite communication earth receiving station apparatus according to the present invention comprises a plurality of receivers that can be used as both control receivers and channel receivers. That is, a wideband frequency converter that converts a signal transmitted from a satellite relay station into a signal of a first intermediate frequency,
The output of this wideband frequency converter is input, the CSC signal continuously transmitted is received, the first local oscillation frequency phase-locked to the carrier frequency of this CSC is generated, and the first frequency converter is supplied. A plurality of receivers operating as a control receiver to be supplied or as a channel receiver for receiving an arbitrary communication channel transmitted as a burst signal, and one receiver of the plurality of receivers is a control receiver And means for operating the others as a channel receiver.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面について説明す
る。図１は本発明の一実施例を示すブロック図であっ
て、図において、図３２同一符号は同一または相当部分
を示し、図３２説明すた重複部分の説明は省略する。第
１周波数変換器２は、アンテナ１で受信した信号を無線
周波数のまま増幅する低雑音増幅器２０、第１ミキサ２
１、及び広帯域の中間周波増幅機２２で構成される。こ
の第１周波数変換器２の出力は、分配器３を介して複数
の受信機４ａ，４ｂ，４ｃに供給される。また、各受信
機４ａ，４ｂ，４ｃのＶＣＯ４４の出力は第１のセレク
タ８ａに、レベル検出部４５の出力は第２のセレクタ８
ｂに接続される。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the same reference numerals in FIG. 32 denote the same or corresponding parts, and the description of the overlapping parts described in FIG. 32 will be omitted. The first frequency converter 2 includes a low noise amplifier 20 that amplifies a signal received by the antenna 1 at a radio frequency, and a first mixer 2
1 and a wide band intermediate frequency amplifier 22. The output of the first frequency converter 2 is supplied to the plurality of receivers 4a, 4b, 4c via the distributor 3. The output of the VCO 44 of each receiver 4a, 4b, 4c is output to the first selector 8a, and the output of the level detection unit 45 is output to the second selector 8a.
connected to b.
【００１２】複数台の受信機４のうちのどれを制御受信
機として使用し、どれをチャネル受信機として使用する
かは、例えば、ホストコンピュータ（図示せず）から端
局７を通して当該受信機を制御して行う。受信機４ａを
制御受信機とし、受信機４ｂをチャネル受信機とする場
合、ホストコンピュータは端局７ａを経て、受信機４ａ
のデータ処理部４６−４ａにＣＳＣ搬送周波数を受信す
べき指令を与えると、その指令に従って論理部４７−４
ａが周波数シンセサイザ４８−４ａに当該周波数を受信
するための第２局部発振周波数（式（１）の例では
ｆ2p）を設定する。Which of a plurality of receivers 4 is used as a control receiver and which is used as a channel receiver is determined by, for example, a host computer (not shown) through a terminal station 7 Control and do. When the receiver 4a is the control receiver and the receiver 4b is the channel receiver, the host computer goes through the terminal station 7a and then the receiver 4a.
When a command to receive the CSC carrier frequency is given to the data processing unit 46-4a of the above, the logic unit 47-4 follows the command.
A sets a second local oscillation frequency (f 2p in the example of the formula (1)) for receiving the frequency in the frequency synthesizer 48-4a.
【００１３】同時にセレクタ８ａ，８ｂを制御して、受
信機４ａのＶＣＯ４４−４ａの出力とレベル検出部４５
−４ａの出力とを第１周波数変換器２に接続する。復調
部４２で生成した位相誤差出力がローパスフィルタ４３
に接続され、ＶＣＯ４４の位相ロックループを構成して
いる。一方、端局７ｂを経て、受信機４ｂのデータ処理
部４６−４ｂに、ＣＳＣを受信すべき指令を与えると、
受信機４ｂはＣＳＣの待ち受け受信状態に入る。At the same time, the selectors 8a and 8b are controlled so that the output of the VCO 44-4a of the receiver 4a and the level detector 45 are controlled.
-4a output is connected to the first frequency converter 2. The phase error output generated by the demodulator 42 is the low-pass filter 43.
And forms a phase locked loop for the VCO 44. On the other hand, if a command to receive CSC is given to the data processing unit 46-4b of the receiver 4b via the terminal station 7b,
The receiver 4b enters the CSC standby reception state.
【００１４】ＣＳＣによって特定のチャネルの受信が指
示されると、その指示は復調部４２−４ｂからデータ処
理部４６−４ｂに入り、データ処理部４６−４ｂはＣＳ
Ｃによって指示された特定のチャネルを受信するように
論理部４７−４ｂを介して周波数シンセサイザ４８−４
ｂを制御する。受信機４ｂが特定のチャネルを受信して
いる間は、受信機４ｃがＣＳＣを待ち受け受信する。When the CSC gives an instruction to receive a specific channel, the instruction enters from the demodulation section 42-4b to the data processing section 46-4b, and the data processing section 46-4b sends the CS signal to the CS.
The frequency synthesizer 48-4 is received via the logic unit 47-4b so as to receive the specific channel designated by C.
Control b. While the receiver 4b is receiving the specific channel, the receiver 4c waits for and receives the CSC.
【００１５】万一、受信機４ａが故障すると、ホストコ
ンピュータの制御によって受信機４ｂが制御受信機とし
て用いられ、このときは受信機４ｃがＣＳＣを待ち受け
受信する。すなわち、この場合にはこの地球受信局から
チャネル受信機が１台減少したことになるが、従来の装
置のように全体の受信局が動作不能となるようなことは
なくなる。なお、受信機４ａの故障が例えばＶＣＯ４４
−４ａの故障であるような場合には、受信機４ａはチャ
ネル受信機としては使用できるので、受信機４ｂを制御
受信機として使用し、受信機４ａをチャネル受信機とし
て使用するだけで、この地球受信局の機能は何ら低下し
ない。Should the receiver 4a break down, the receiver 4b is used as a control receiver under the control of the host computer, and at this time, the receiver 4c waits for and receives the CSC. That is, in this case, the number of channel receivers is reduced by one from the earth receiving station, but the whole receiving station does not become inoperable unlike the conventional apparatus. Note that the failure of the receiver 4a is caused by, for example, the VCO44.
In the case of a failure of -4a, since the receiver 4a can be used as a channel receiver, it is only necessary to use the receiver 4b as a control receiver and the receiver 4a as a channel receiver. The function of the earth receiving station does not deteriorate at all.
【００１６】[0016]
【発明の効果】以上説明したように本発明の衛星通信地
球受信局装置は、衛星通信の地球受信局でＣＳＣの搬送
周波数を受信して第１局部発振周波数を発生する制御受
信機が故障した場合でも、その地球受信局全体が動作不
能になることを防止できるという効果がある。As described above, in the satellite communication earth receiving station apparatus of the present invention, the control receiver for receiving the carrier frequency of CSC and generating the first local oscillation frequency at the earth receiving station of satellite communication has failed. Even in this case, it is possible to prevent the entire earth receiving station from becoming inoperable.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】従来の装置の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a conventional device.
【図３】従来の装置の構成を示すブロック図である。FIG. 3 is a block diagram showing a configuration of a conventional device.
２ 第１周波数変換器 ３ 分配器 ４ 受信機 ７ 端末装置 ８ａ 第１のセレクタ ８ｂ 第２のセレクタ ４０ 第２周波数変換器 ４１ 第２中間周波増幅器 ４２ 変調部 ４３ ローパスフィルタ ４４ ＶＣＯ ４５ レベル検出部 ４６ データ処理部 ４７ 論理部 ４８ 周波数シンセサイザ 2 1st frequency converter 3 distributor 4 receiver 7 terminal device 8a 1st selector 8b 2nd selector 40 2nd frequency converter 41 2nd intermediate frequency amplifier 42 modulator 43 low-pass filter 44 VCO 45 level detector 46 Data processing unit 47 Logic unit 48 Frequency synthesizer
Claims (3)
るための衛星通信地球受信局装置において、 衛星中継局から送信される無線周波数の信号を第１中間
周波数の信号に変換する第１周波数変換器、 この第１周波数変換器の出力を入力し、衛星通信に用い
られるＳＣＰＣ（Ｓｉｎｇｌｅ Ｃｈａｎｎｅｌ Ｐｅ
ｒ Ｃａｒｒｉｅｒ）方式の中で連続して送信されるＣ
ＳＣ（Ｃｏｍｍｏｎ Ｓｉｇｎａｌｌｉｎｇ Ｃｈａｎ
ｎｅｌ）を受信し、このＣＳＣの搬送周波数に対して位
相ロックされた第１局部発振周波数を生成して前記第１
周波数変換器に供給する制御受信機として、又は前記Ｓ
ＣＰＣ方式の任意のチャネルを受信するチャネル受信機
として動作する複数台の受信機、 これらの複数台の受信機のうちの１台の受信機を前記制
御受信機として動作させ、その他を前記チャネル受信機
として動作させる手段、 を備えたことを特徴とする衛星通信地球受信局装置。1. A satellite communication earth receiving station apparatus for receiving a signal transmitted from a satellite relay station, wherein a first frequency for converting a radio frequency signal transmitted from the satellite relay station into a signal of a first intermediate frequency. A converter, which receives the output of the first frequency converter and which is used for satellite communication in an SCPC (Single Channel Pe)
r Carrier) C continuously transmitted in the
SC (Common Signaling Chan)
(nel) and generates a first local oscillation frequency that is phase locked to the carrier frequency of this CSC to generate the first local oscillation frequency.
As a control receiver for supplying to a frequency converter, or the S
A plurality of receivers operating as channel receivers for receiving arbitrary channels of the CPC system, one receiver of these plurality of receivers operating as the control receiver, and others receiving the channels A satellite communication earth receiving station apparatus comprising means for operating as a satellite.
１中間周波数の信号を第２局部発振周波数により第２中
間周波数の信号に変換する第２周波数変換器、 この第２周波数変換器からの信号のうちの所定の周波数
帯の信号を増幅する第２中間周波増幅器、 この第２中間周波数増幅器からの信号を復調する復調
部、 前記第１局部発振周波数を発生するＶＣＯの発振周波数
を前記復調器で検出される位相誤差信号によりフィード
バック制御する手段、 前記第２中間周波数増幅器の出力レベルを検出するレベ
ル検出部、 前記復調部の出力が入力されるデータ処理部、 前記第２局部発振周波数を発生する周波数シンセサイ
ザ、 この周波数シンセサイザの発振周波数を前記データ処理
部からの信号により設定する手段、 を備えたことを特徴とする請求項第１項記載の衛星通信
地球受信局装置。2. Each of the plurality of receivers receives a signal of a first intermediate frequency, which is input from the first frequency converter through a distributor, and outputs a signal of a second intermediate frequency by a second local oscillation frequency. A second frequency converter for converting into a signal, a second intermediate frequency amplifier for amplifying a signal in a predetermined frequency band of the signal from the second frequency converter, and a demodulation for demodulating the signal from the second intermediate frequency amplifier Section, means for feedback controlling the oscillation frequency of the VCO for generating the first local oscillation frequency by a phase error signal detected by the demodulator, a level detection section for detecting an output level of the second intermediate frequency amplifier, the demodulation A data processing unit to which the output of the unit is input; a frequency synthesizer that generates the second local oscillation frequency; and an oscillation frequency of the frequency synthesizer that is transmitted from the data processing unit. Satellite earth receiving station apparatus according to claim any preceding claim, characterized in that it comprises means, to be set by the.
機を前記制御受信機として動作させ、その他を前記チャ
ネル受信機として動作させる手段は、ホストコンピュー
タから制御用受信機として動作させる両用受信機のデー
タ処理部に信号を送り当該受信機のシンセザイザが前記
ＣＳＣの搬送周波数を受信するための第２局部発振周波
数を発生するように制御させ、かつ当該受信機のＶＣＯ
の出力を第１のセレクタを介して前記第１周波数変換器
の第１局部発振周波数として接続し、当該受信機のレベ
ル検出部の出力を第２セレクタを介して前記第１周波数
変換器の利得をフィードバック制御する信号として接続
することを特徴とする請求項第２項記載の衛星通信地球
受信局装置。3. A means for operating one receiver of the plurality of receivers as the control receiver and operating the other as the channel receiver from a host computer as a control receiver. A signal is sent to the data processing unit of the dual-purpose receiver to control the synthesizer of the receiver to generate the second local oscillation frequency for receiving the carrier frequency of the CSC, and the VCO of the receiver is controlled.
Is connected as the first local oscillation frequency of the first frequency converter via a first selector, and the output of the level detector of the receiver is connected to the gain of the first frequency converter via a second selector. Is connected as a signal for feedback control of the satellite communication earth receiving station apparatus according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6064344A JP2812194B2 (en) | 1993-03-19 | 1994-03-09 | Satellite communication earth receiving station equipment |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5-59997 | 1993-03-19 | ||
| JP5999793 | 1993-03-19 | ||
| JP6064344A JP2812194B2 (en) | 1993-03-19 | 1994-03-09 | Satellite communication earth receiving station equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06326640A true JPH06326640A (en) | 1994-11-25 |
| JP2812194B2 JP2812194B2 (en) | 1998-10-22 |
Family
ID=26401062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6064344A Expired - Lifetime JP2812194B2 (en) | 1993-03-19 | 1994-03-09 | Satellite communication earth receiving station equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2812194B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6871053B2 (en) | 2000-07-03 | 2005-03-22 | Fujitsu Limited | Wireless communication apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62290207A (en) * | 1986-06-10 | 1987-12-17 | Nec Corp | Radio transmitter |
-
1994
- 1994-03-09 JP JP6064344A patent/JP2812194B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62290207A (en) * | 1986-06-10 | 1987-12-17 | Nec Corp | Radio transmitter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6871053B2 (en) | 2000-07-03 | 2005-03-22 | Fujitsu Limited | Wireless communication apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2812194B2 (en) | 1998-10-22 |
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