JP4559037B2 - Transmission / reception terminal device - Google Patents

Transmission / reception terminal device Download PDF

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Publication number
JP4559037B2
JP4559037B2 JP2003119603A JP2003119603A JP4559037B2 JP 4559037 B2 JP4559037 B2 JP 4559037B2 JP 2003119603 A JP2003119603 A JP 2003119603A JP 2003119603 A JP2003119603 A JP 2003119603A JP 4559037 B2 JP4559037 B2 JP 4559037B2
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transmission
reception
broadcast
receiving
distributor
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JP2004328326A (en
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洋二 中田
昌孝 大塚
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to JP2003119603A priority Critical patent/JP4559037B2/en
Priority to AU2004201468A priority patent/AU2004201468B2/en
Priority to KR1020040027076A priority patent/KR100576301B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32715—Workpiece holder
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
    • C23C16/505—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using radio frequency discharges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
    • H01J37/3211—Antennas, e.g. particular shapes of coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32082—Radio frequency generated discharge
    • H01J37/32174—Circuits specially adapted for controlling the RF discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/3244—Gas supply means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32623—Mechanical discharge control means
    • H01J37/32651—Shields, e.g. dark space shields, Faraday shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32715—Workpiece holder
    • H01J37/32724—Temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32733—Means for moving the material to be treated
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H05H1/4645—Radiofrequency discharges

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Power Engineering (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、衛星放送の受信を行いつつ、衛星通信をすることができる送受信端末装置に関するものである。
【０００２】
【従来の技術】
衛星放送及び衛星通信の分野における地上端末装置は、ＢＳ放送やＣＳ放送に代表される衛星放送を受信する受信端末装置と、衛星を介した双方向通信を目的とする送受信端末装置とに分類される。例えば、衛星放送に使用される受信端末装置については、特開平７−７５０３４号公報に記載されるように、複数の番組を同時に受信して映像面に映し出すために複数の受信系統を備えたものが考え出されるに至っている。
【０００３】
【特許文献１】
特開平７−７５０３４号公報。
【０００４】
【発明が解決しようとする課題】
上記のように地上端末装置は、放送受信目的又は通信目的のそれぞれの専用装置として開発されてきた経緯のために、放送受信及び衛星通信の双方を同時送受信することができないという問題点があった。上記の特開平７−７５０３４号公報に記載された受信装置についても、多数の受信系統を備えるものの、その目的とするところは衛星放送の受信のみであり、衛星通信と複合することについては検討されていない。
【０００５】
この発明は、上記のような問題点を解決するためになされたもので、衛星放送の受信を行いつつ、衛星通信をすることができる送受信端末装置を得ることを目的とする。
【０００６】
【課題を解決するための手段】
請求項１の発明に係る送受信端末装置は、衛星からの電波を送受信する送受信アンテナと、この送受信アンテナにより送受信する信号を分波する分波器と、この分波器からの受信信号を分配する分配器と、選局操作入力に基いて受信チャネルが設定されて、上記分配器からの１の出力を低周波変換し、データ伸長し、映像再生及び音声再生してゲートウェイ局からの放送を放送受信する放送受信部と、上記分配器からの他の１の出力を低周波変換し、管理コマンドを再生し、応答信号を生成する双方向通信部とを備え、上記放送受信部により放送受信しつつ、上記双方向通信部により生成した応答信号を上記分波器を介して上記送受信アンテナから上記衛星へ送信するものである。
【０００７】
請求項２の発明に係る送受信端末装置は、衛星からの電波を受信する受信アンテナと、この受信アンテナにより受信した受信信号を分配する分配器と、選局操作入力に基いて受信チャネルが設定されて、上記分配器からの１の出力を低周波変換し、データ伸長し、映像再生及び音声再生してゲートウェイ局からの放送を放送受信する放送受信部と、上記分配器からの他の１の出力を低周波変換し、管理コマンドを再生し、応答信号を生成する双方向通信部とを備え、上記放送受信部により放送受信しつつ、上記双方向通信部により生成した応答信号を送信アンテナを介して衛星へ送信するものである。
【００１１】
【発明の実施の形態】
実施の形態１．
この発明の実施の形態１に係る送受信端末装置を図１から図３によって説明する。図１は実施の形態１に係る送受信端末装置が使用される衛星通信システムの構成図である。図２は実施の形態１に係る送受信端末装置において送受信する信号の模式図である。図３は、実施の形態１に係る送受信端末装置の構成を示すブロック図である。図１において、１はゲートウェイ局、２は通信衛星、３は送受信端末装置であり、ゲートウェイ局１から通信衛星２を介して送受信装置３へ回線Ｆ１により放送送信を行うとともに、下り回線Ｆ２及び上り回線Ｆ３による双方向通信を行うものである。また、図２において、４は回線Ｆ１によって放送送信するパケットであり、５は下り回線Ｆ２により通信衛星２を介してゲートウェイ局１から送受信端末装置３へ送信する管理コマンド、６は上り回線Ｆ３により通信衛星２を介して送受信端末装置３からゲートウェイ局１へ送信する応答データである。
【００１２】
ゲートウェイ局１は、音楽データや映像データ等を蓄積しており、蓄積された音楽データや映像データを圧縮コーデックによって時間圧縮してパケット４を生成し、回線Ｆ１により放送する。また、ゲートウェイ局１は各送受信端末装置との間で双方向通信を行うものである。この双方向通信の用途には、送受信端末装置が車両等の移動体に搭載されている場合に、その移動体の運行管理を行う用途や、その移動体に緊急事態が発生した場合に緊急通報する用途、等がある。
【００１３】
次に図３により実施の形態１に係る送受信端末装置の構成を説明する。図３において、７は通信衛星２との間で電波を送受信する送受信アンテナ、８は受信波と送信波を分波する分波器、９は受信波を増幅する低雑音増幅器、１０は受信波を分配する分配器である。１１は通信衛星２を介して送信される放送電波を受信する放送受信部であり、１２は通信衛星２を介してゲートウェイ局１との間で双方向通信を行う双方向通信部、１３は双方向通信部１２により生成された応答信号を増幅する高出力増幅器である。放送受信部１１内において、１４はＣＨ制御信号に基づいて放送チャネルを選択し、放送受信した受信信号を中間周波数へ変換する周波数変換器、１５はＱＰＳＫ等の復調処理を行う復調器、１６は誤り訂正器である。１７は受信信号からパケット毎にパケットデータを抽出するパケット抽出回路、１８はパケットデータを伸長して音声・映像データを再生するＡＶデータ伸長回路、１９は出力先の表示装置やスピーカとのインタフェースをとるための出力インタフェース、２０は周波数変換器１４へ選択する放送チャネルを出力するチャネル制御部である。一方、双方向通信部１２において、２１はＣＨ制御信号に基づいて、双方向通信チャネルを選択して中間周波数への変換を行う周波数変換器、２２はＱＰＳＫ等の復調処理を行う復調器、２３は誤り訂正器である。２４は受信信号から管理データを再生する管理データ再生回路、２５は管理データに基づいて応答を指示する制御部、２６は制御部からの応答指示により、応答データを生成する応答データ生成回路である。２７は応答データに誤り訂正符号を付加する誤り訂正符号化器、２８はＱＰＳＫ等の変調を行う変調器、２９は変調器２８出力を高周波変換する高周波変換器である。
【００１４】
次に送受信端末装置の動作について説明する。通信衛星２から放送される放送信号は送受信アンテナ７により受信される。この受信信号は、分波器８を経由して低雑音増幅器９へ入力する。低雑音増幅器９により受信信号を増幅した後、分配器により受信信号を分配する。また、双方向通信により受信した受信信号も、同様にアンテナ７、分波器８、低雑音増幅器９を経て分配器１０により分配される。分配器１０は、送受信アンテナ７からの受信信号を２系統に分配しており、分配した受信信号の一方を放送受信部１１に、もう一方を双方向通信部１２に入力するものである。放送受信部１１は放送信号を受信して音声・映像等のＡＶデータを再生出力する。まず、周波数変換器１４では、放送されている複数のチャネルから１チャネルを選択するＣＨ制御信号が入力され、このＣＨ制御信号により位相同期ループで生成する局発信号をＣＨに応じた周波数とし、受信した高周波信号と局発信号をミキシングして低周波変換する。復調器１５はＱＰＳＫ変調波等の復調を行い、誤り訂正器１６は、誤り訂正符号による復調処理を行う。
【００１５】
復調された放送信号に対してパケット抽出回路１７においてパケットデータの読み出し処理を行う。ここで、放送信号は、ディジタル化され圧縮符号化されてパケットに格納して、順次送信されていることを想定している。放送送信されるパケットは、パケット抽出回路１７において、パケットヘッダ部により識別し読み出し処理する。パケット抽出回路１７により読み出されたパケットデータはＡＶデータ伸長回路１８により、音声及び映像データの伸長処理を行い出力する。この際、ＡＶデータ伸長回路１８では、伸長された音声及び映像データをバッファ処理して、複数のパケットに亘って送信される音声及び映像データを順次連結して出力する。出力インタフェース回路１９は、表示装置及び拡声装置の入出力方式に応じて音声・映像データを変換し出力する。チャネル制御部２０は、主として操作者の選局操作入力に基づいて受信する放送チャネルを設定し、周波数変換器１４に受信チャネルを指令する。さらに、複数の周回する衛星を順次切り替えて放送受信したり、衛星からのマルチビーム放送に対し、自局がビーム間を移動しつつ放送受信したりするような場合に生じる衛星間でのチャネル切替、ビーム間でのチャネル切替の発生に基づいて、自動的にＣＨ制御信号を周波数変換器に指令するものとしてもよい。
【００１６】
次に、双方向通信部１２の動作について説明する。送受信アンテナ７によって受信した双方向通信チャネルの受信信号は、分波器８を経由して低雑音増幅器９により増幅され、分配器１０により分配される。周波数変換器２１はＣＨ制御信号に基づいて、双方向通信チャネルを選択し、中間周波数への変換を行う。この周波数変換器の動作は周波数変換器１４の動作と同様である。周波数変換後の受信信号は復調器２２に入力され、復調器２２はＱＰＳＫ変調等の復調を行い、誤り訂正器２３は誤り訂正符号による復調処理を行う。管理データ再生回路２４は、受信信号から管理データを再生する。ここで、双方向通信における受信信号の通信方式は、放送受信の場合のパケット方式であっても良いし、ＴＤＭ（時間多重化）方式、ＦＤＭ（周波数多重化）方式等の種々の方式が考えられる。これらのどの方式を採用するかは、この送受信端末装置が双方向通信に使用される目的、例えば運行管理や緊急通報等の目的、及び送受信端末装置の数、通信頻度等に基づいて設定されるものである。
【００１７】
管理データ再生回路２４により再生された管理コマンドは、制御部２５に入力され、制御部２５は、管理コマンドに応じて処理を実行し、応答データ生成回路２６に対して、応答指令を出力する。制御部２５は、適宜管理コマンドの表示のための出力、及び応答データの入力を有する。さらに、上述の衛星間でのチャネル切替やビーム間移動に伴うチャネル切替のためのＣＨ制御信号を生成して出力する。ここで、制御部２５は、運行管理を行う用途や、緊急通報を行う用途等に応じて、処理を行うものであり、次に説明する。
【００１８】
運行管理を行う用途においては、ゲートウェイ局１は各種の管理コマンド５を生成し、下り回線Ｆ２により送信する。管理コマンド５には、例えば、送受信端末装置３の正常動作又は異常動作状態を応答させるためのヘルスチェックコマンドや、送受信端末装置３の現在位置を特定周期或いはイベント的に送信させるための位置確認コマンド等の各種の情報収集コマンド、この他、天気情報、交通情報等の提供など必ずしも送受信端末装置３からの応答を要求しない情報提供コマンドを用意する。これらの管理コマンドに対して、制御部２５は応答指令を応答データ生成回路２６へ出力し、双方向通信部１２は応答データ６を上り回線Ｆ３により通信衛星を介してゲートウェイ局１へ送信する。例えば上記のヘルスチェックコマンドに対して、送受信端末装置３や、搭載される移動体の動作チェックを行い、正常状態であるか異常状態であるかを応答データ６に格納して送信する。また、制御部２５は、位置確認コマンドに対して、ＧＰＳ受信機から位置情報を応答入力として取得し、取得した位置情報を応答データに格納するよう応答データ生成回路２６に指令し、ゲートウェイ局１へ送信する。
【００１９】
緊急通報を行う用途においては、運行管理を行う用途と同様に、ゲートウェイ局１は各種の管理コマンド５を生成し、下り回線Ｆ２により送信する。管理コマンド５には、例えば、送受信端末装置３の正常動作又は異常動作状態を応答させるためのヘルスチェックコマンドや、送受信端末装置３の現在位置を特定周期或いはイベント的に送信させるための位置確認コマンド等の各種の情報収集コマンドがある。また、送受信端末装置３側からは、上記のような管理コマンドに対して応答するとともに、その送受信端末装置３や搭載される移動体の異常状態を検出して、これを上り回線Ｆ３により、応答データ６と同様な形式により緊急通報する。異常状態とは、例えば車両や船舶、航空機等の移動体において事故が発生した状態が考えられる。この状態は、運転者等のオペレータによって送受信端末装置に入力されてもよいし、或いは車両等の異常を自動検知して送受信端末装置に入力されてもよい。自動検知の方法としては、例えば車両にあっては特定部分の異常過熱等、船舶にあっては浸水、航空機にあっては高度の急速低下等を、温度計や水位計、高度計等の計測器を用いて計測すればよい。また、車両等の移動体が盗難に遭遇するような場合も異常状態とすることができる。盗難に遭遇した場合の異常検出は、盗難防止用ロックの認証外解除を検知して、送受信端末装置３に入力されるようにすればよい。いずれにしても、異常状態であることが送受信端末装置３に入力されると、送受信端末装置３においては、異常状態である旨の応答データ６を生成し、上り回線Ｆ３により緊急通報を行う。
【００２０】
応答データ生成回路２６において生成された応答データは、誤り訂正符号化器２７により、誤り訂正符号を施し、変調器２８によりＱＰＳＫ等の変調を行い、高周波変換器２９により高周波変換し、さらに高出力増幅器１３により増幅する。高出力増幅器１３の出力は分波器８を介して送受信アンテナ７から送信する。なお、分波器８は送受信アンテナ７からの受信信号と送受信アンテナ７への送信信号を分波するものである。
【００２１】
このように送受信アンテナ７が受信した受信信号を放送受信部１１と双方向通信部１２とに分配して、それぞれ受信信号の処理を行い、双方向通信部１２は応答データの生成し分波器８を介して送受信アンテナ７により送信することにより、放送受信と双方向通信とを行うことができる。また送受信アンテナ７により受信及び送信を行うので、送受信端末装置の小型化を図ることができる。
【００２２】
なお、図３においては、双方向通信部１２からの送信信号を分波器８を介して送受信アンテナ７へ入力しているが、送受信アンテナ７を受信アンテナと送信アンテナに分割し、受信アンテナにより受信した受信信号を低雑音増幅器９へ入力し、双方向通信部１２からの送信信号を送信アンテナに入力するように構成してもよい。この場合、分波器８は不要となる。
【００２３】
実施の形態２．
この発明の実施の形態２に係る送受信端末装置について図４により説明する。
図４は、実施の形態２に係る送受信端末装置の構成を示すブロック図である。図４において、３０は通信衛星２を介してゲートウェイ局１との間で双方向の通信を行う第１の双方向通信部、３１は通信衛星２を介してゲートウェイ局１との間で双方向の通信を行う第２の双方向通信部であり、３２は第１の双方向通信部３０と第２の双方向通信部３１が出力する送信信号を切り替えて、高出力増幅器１３に出力する切替器である。図４において、図３と同一の符号を付した部分又は部品は図３におけるそれらと同等又は相当する部分又は部品を示す。
【００２４】
例えば、第１の双方向通信部３０として運行管理用途の双方向通信部を設け、第２の双方向通信部３１として緊急通報用途の双方向通信部を設けるような場合が考えられる。放送受信部１１での動作、第１の双方向通信部３０内及び第２の双方向通信部３１内での各２１〜２９のブロックの動作は実施の形態１において説明したものと同様であるので説明を省略する。分配器１０は双受信アンテナ７により受信した受信信号を３系統に分配しており、それぞれ放送受信部１１、第１の双方向通信部３０、第２の双方向通信部３１に入力される。また第１の双方向通信部３０からの送信信号、及び第２の双方向通信部３１からの送信信号は切替器３２に入力され、いずれか一方の送信信号を切り替えによって選択し高出力増幅器１３へ出力する。高出力増幅器１３出力は、分波器８を介して送受信アンテナ７から通信衛星２へ送信される。このように構成することで、１の放送受信と、複数系統の双方向通信を行うことが可能となる。
【００２５】
なお、図４においては、送受信アンテナ７によりアンテナ共用しているが、送受信アンテナ７を受信アンテナと送信アンテナに分割し、受信アンテナにより受信した受信信号を低雑音増幅器９へ入力し、第１の双方向通信部３０及び第２の双方向通信部３１からの送信信号を切替器３２及び高出力増幅器１３を経由して送信アンテナに入力するように構成してもよい。この場合、分波器８は不要となる。
【００２６】
【発明の効果】
この発明の請求項１又は請求項２に係る発明によれば、送受信アンテナが受信した受信信号を放送受信部と双方向通信部とに分配して、それぞれ受信信号の処理を行い、双方向通信部は応答データを生成し分波器を介して送受信アンテナにより送信するので、放送受信と双方向通信とを行うことができる。
【図面の簡単な説明】
【図１】 この発明の実施の形態１に係る送受信端末装置が使用される衛星通信システムの構成図である。
【図２】 この発明の実施の形態１に係る送受信端末装置において送受信する信号の模式図である。
【図３】 この発明の実施の形態１に係る送受信端末装置の構成を示すブロック図である。
【図４】 この発明の実施の形態２に係る送受信端末装置の構成を示すブロック図である。
【符号の説明】
７ 送受信アンテナ
８ 分波器
１０ 分配器
１１ 放送受信部
１２ 双方向通信部
３０ 第１の双方向通信部
３１ 第２の双方向通信部
３２ 切替器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission / reception terminal device capable of performing satellite communication while receiving satellite broadcast.
[0002]
[Prior art]
Terrestrial terminal devices in the field of satellite broadcasting and satellite communication are classified into receiving terminal devices that receive satellite broadcasting typified by BS broadcasting and CS broadcasting, and transmitting / receiving terminal devices that are intended for bidirectional communication via satellite. The For example, a receiving terminal device used for satellite broadcasting is provided with a plurality of receiving systems in order to simultaneously receive a plurality of programs and display them on a video screen, as described in JP-A-7-75034. Has come to be conceived.
[0003]
[Patent Document 1]
JP-A-7-75034.
[0004]
[Problems to be solved by the invention]
As described above, the terrestrial terminal device has a problem in that it cannot simultaneously transmit and receive both broadcast reception and satellite communication due to the circumstances that have been developed as dedicated devices for broadcast reception or communication purposes. . The receiver described in the above Japanese Patent Application Laid-Open No. 7-75034 is also provided with a large number of receiving systems, but its intended purpose is only to receive satellite broadcasts, and it has been studied to combine with satellite communications. Not.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a transmission / reception terminal device capable of performing satellite communication while receiving satellite broadcast.
[0006]
[Means for Solving the Problems]
The transmission / reception terminal device according to the invention of claim 1 distributes a reception signal from the transmission / reception antenna for transmitting / receiving a radio wave from a satellite, a duplexer for demultiplexing a signal transmitted / received by the transmission / reception antenna, and the duplexer. The receiving channel is set based on the distributor and the channel selection operation input, the output of 1 from the distributor is converted to low frequency, the data is decompressed, the video and audio are reproduced, and the broadcast from the gateway station is broadcast. A broadcast receiving unit for receiving, and a bidirectional communication unit for converting the other one output from the distributor to low frequency, reproducing a management command, and generating a response signal, and receiving the broadcast by the broadcast receiving unit. On the other hand, the response signal generated by the bidirectional communication unit is transmitted from the transmitting / receiving antenna to the satellite via the duplexer.
[0007]
In the transmission / reception terminal device according to the second aspect of the present invention, a reception antenna for receiving radio waves from a satellite, a distributor for distributing a reception signal received by the reception antenna, and a reception channel are set based on a channel selection operation input. Te, one of the outputs from the distributor converts a low frequency, and data decompression, and the broadcast receiving unit to broadcast receiving broadcast from the video playback and audio playback to the gateway station, the other one from the distributor A bidirectional communication unit that converts the output to low frequency, reproduces a management command, and generates a response signal. The broadcast reception unit broadcasts the response signal generated by the bidirectional communication unit to the transmission antenna. Via the satellite.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
A transmission / reception terminal device according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a satellite communication system in which a transmission / reception terminal device according to Embodiment 1 is used. FIG. 2 is a schematic diagram of signals transmitted and received in the transmission / reception terminal device according to the first embodiment. FIG. 3 is a block diagram showing a configuration of the transmission / reception terminal apparatus according to Embodiment 1. In FIG. 1, 1 is a gateway station, 2 is a communication satellite, 3 is a transmission / reception terminal device, which performs broadcast transmission from the gateway station 1 to the transmission / reception device 3 via the communication satellite 2 via the line F1, and the downlink F2 and the uplink Bidirectional communication is performed via the line F3. Also, in FIG. 2, 4 is a packet transmitted by broadcast on the line F1, 5 is a management command transmitted from the gateway station 1 to the transmission / reception terminal device 3 via the communication satellite 2 by the downlink F2, and 6 is by the uplink F3. Response data transmitted from the transmission / reception terminal device 3 to the gateway station 1 via the communication satellite 2.
[0012]
The gateway station 1 stores music data, video data, and the like. The stored music data and video data are time-compressed by a compression codec to generate a packet 4 and broadcast it via the line F1. The gateway station 1 performs two-way communication with each transmission / reception terminal device. The two-way communication is used when the transmission / reception terminal device is mounted on a moving body such as a vehicle, for the purpose of managing the operation of the moving body, or when an emergency occurs in the moving body. There are uses, etc.
[0013]
Next, the configuration of the transmission / reception terminal device according to Embodiment 1 will be described with reference to FIG. In FIG. 3, 7 is a transmission / reception antenna that transmits and receives radio waves to and from the communication satellite 2, 8 is a demultiplexer that demultiplexes received and transmitted waves, 9 is a low-noise amplifier that amplifies the received waves, and 10 is a received wave. Is a distributor. 11 is a broadcast receiving unit that receives broadcast radio waves transmitted via the communication satellite 2, 12 is a bidirectional communication unit that performs bidirectional communication with the gateway station 1 via the communication satellite 2, and 13 is both This is a high-power amplifier that amplifies the response signal generated by the bidirectional communication unit 12. In the broadcast receiving unit 11, 14 is a frequency converter that selects a broadcast channel based on the CH control signal and converts the received signal received by broadcast to an intermediate frequency, 15 is a demodulator that performs demodulation processing such as QPSK, and 16 is It is an error corrector. 17 is a packet extraction circuit that extracts packet data for each packet from the received signal, 18 is an AV data decompression circuit that decompresses the packet data and reproduces audio / video data, and 19 is an interface with an output destination display device or speaker. An output interface 20 is a channel control unit that outputs a broadcast channel to be selected to the frequency converter 14. On the other hand, in the bidirectional communication unit 12, 21 is a frequency converter that selects a bidirectional communication channel based on the CH control signal and performs conversion to an intermediate frequency, 22 is a demodulator that performs demodulation processing such as QPSK, and 23 Is an error corrector. Reference numeral 24 denotes a management data reproduction circuit that reproduces management data from the received signal, reference numeral 25 denotes a control unit that instructs a response based on the management data, and reference numeral 26 denotes a response data generation circuit that generates response data in response to a response instruction from the control unit. . 27 is an error correction encoder that adds an error correction code to response data, 28 is a modulator that performs modulation such as QPSK, and 29 is a high frequency converter that converts the output of the modulator 28 to high frequency.
[0014]
Next, the operation of the transmission / reception terminal device will be described. A broadcast signal broadcast from the communication satellite 2 is received by the transmission / reception antenna 7. This received signal is input to the low noise amplifier 9 via the duplexer 8. After the received signal is amplified by the low noise amplifier 9, the received signal is distributed by the distributor. Similarly, the received signal received by the bidirectional communication is distributed by the distributor 10 via the antenna 7, the demultiplexer 8, and the low noise amplifier 9. The distributor 10 distributes the received signal from the transmission / reception antenna 7 into two systems, and inputs one of the distributed received signals to the broadcast receiving unit 11 and the other to the bidirectional communication unit 12. The broadcast receiving unit 11 receives broadcast signals and reproduces and outputs AV data such as audio and video. First, in the frequency converter 14, a CH control signal for selecting one channel from a plurality of broadcast channels is input, and a local oscillation signal generated in a phase locked loop by this CH control signal is set to a frequency corresponding to the CH, The received high frequency signal and local signal are mixed and converted to low frequency. The demodulator 15 demodulates a QPSK modulated wave or the like, and the error corrector 16 performs demodulation processing using an error correction code.
[0015]
The packet extraction circuit 17 performs a packet data read process on the demodulated broadcast signal. Here, it is assumed that the broadcast signal is digitized, compressed and encoded, stored in a packet, and sequentially transmitted. The packet transmitted by broadcast is identified and read out by the packet header 17 in the packet extraction circuit 17. The packet data read out by the packet extraction circuit 17 is subjected to audio and video data expansion processing by the AV data expansion circuit 18 and output. At this time, the AV data decompression circuit 18 buffers the decompressed audio and video data, and sequentially concatenates and outputs the audio and video data transmitted over a plurality of packets. The output interface circuit 19 converts and outputs audio / video data according to the input / output method of the display device and the loudspeaker. The channel control unit 20 sets a broadcast channel to be received mainly based on an operator's channel selection operation input, and instructs the frequency converter 14 on the reception channel. Furthermore, channel switching between satellites that occurs when multiple orbiting satellites are sequentially switched to receive broadcasts or when the local station receives broadcasts while moving between beams for multi-beam broadcasting from satellites. The CH control signal may be automatically instructed to the frequency converter based on the occurrence of channel switching between the beams.
[0016]
Next, the operation of the bidirectional communication unit 12 will be described. The reception signal of the bidirectional communication channel received by the transmission / reception antenna 7 is amplified by the low noise amplifier 9 via the duplexer 8 and distributed by the distributor 10. The frequency converter 21 selects a bidirectional communication channel based on the CH control signal and performs conversion to an intermediate frequency. The operation of this frequency converter is the same as that of the frequency converter 14. The frequency-converted received signal is input to the demodulator 22, the demodulator 22 performs demodulation such as QPSK modulation, and the error corrector 23 performs demodulation processing using an error correction code. The management data reproduction circuit 24 reproduces management data from the received signal. Here, the communication method of the received signal in the bidirectional communication may be a packet method in the case of broadcast reception, and various methods such as a TDM (time multiplexing) method, an FDM (frequency multiplexing) method, etc. are considered. It is done. Which of these methods is adopted is set based on the purpose for which this transmission / reception terminal device is used for two-way communication, for example, the purpose of operation management or emergency notification, the number of transmission / reception terminal devices, the communication frequency, etc. Is.
[0017]
The management command reproduced by the management data reproduction circuit 24 is input to the control unit 25, and the control unit 25 executes processing according to the management command and outputs a response command to the response data generation circuit 26. The control unit 25 has an output for displaying a management command as appropriate and an input of response data. Further, it generates and outputs a CH control signal for channel switching between the above-mentioned satellites and channel switching accompanying movement between beams. Here, the control part 25 performs a process according to the use which performs operation management, the use which performs an emergency call, etc., and is demonstrated below.
[0018]
For the purpose of performing operation management, the gateway station 1 generates various management commands 5 and transmits them via the downlink F2. The management command 5 includes, for example, a health check command for responding to the normal operation or abnormal operation state of the transmission / reception terminal device 3, and a position confirmation command for transmitting the current position of the transmission / reception terminal device 3 in a specific cycle or event. In addition to this, an information provision command that does not necessarily request a response from the transmission / reception terminal device 3 such as provision of weather information, traffic information, and the like is prepared. In response to these management commands, the control unit 25 outputs a response command to the response data generation circuit 26, and the bidirectional communication unit 12 transmits the response data 6 to the gateway station 1 via the communication satellite via the uplink F3. For example, in response to the above health check command, operation check of the transmission / reception terminal device 3 and the mounted mobile body is performed, and the response data 6 stores and transmits whether it is in a normal state or an abnormal state. Further, the control unit 25 acquires position information from the GPS receiver as a response input in response to the position confirmation command, and instructs the response data generation circuit 26 to store the acquired position information in the response data. Send to.
[0019]
In the use for making an emergency call, the gateway station 1 generates various management commands 5 and transmits them through the downlink F2 in the same way as for the use for operation management. The management command 5 includes, for example, a health check command for responding to the normal operation or abnormal operation state of the transmission / reception terminal device 3, and a position confirmation command for transmitting the current position of the transmission / reception terminal device 3 in a specific cycle or event. There are various information collection commands. In addition, the transmission / reception terminal device 3 responds to the management command as described above, detects an abnormal state of the transmission / reception terminal device 3 and a mobile unit mounted thereon, and responds to this via the uplink F3. Make an emergency call in the same format as Data 6. The abnormal state may be a state where an accident has occurred in a moving body such as a vehicle, a ship, or an aircraft. This state may be input to the transmission / reception terminal device by an operator such as a driver, or may be input to the transmission / reception terminal device by automatically detecting an abnormality in the vehicle or the like. Automatic detection methods include, for example, abnormal overheating of specific parts in vehicles, flooding in ships, rapid drop in altitude in aircraft, etc., measuring instruments such as thermometers, water level gauges, and altimeters. What is necessary is just to measure using. Moreover, it can be set as an abnormal state also when moving bodies, such as a vehicle, encounter a theft. The detection of an abnormality in the case of encountering the theft may be performed by detecting the non-authentication release of the antitheft lock and inputting it to the transmission / reception terminal device 3. In any case, when it is input to the transmission / reception terminal device 3 that it is in an abnormal state, the transmission / reception terminal device 3 generates response data 6 indicating that it is in an abnormal state, and makes an emergency call through the uplink F3.
[0020]
The response data generated in the response data generation circuit 26 is subjected to error correction code by the error correction encoder 27, modulated by QPSK or the like by the modulator 28, converted to high frequency by the high frequency converter 29, and further output high. Amplification is performed by the amplifier 13. The output of the high-power amplifier 13 is transmitted from the transmission / reception antenna 7 via the duplexer 8. The duplexer 8 demultiplexes the reception signal from the transmission / reception antenna 7 and the transmission signal to the transmission / reception antenna 7.
[0021]
In this way, the reception signal received by the transmission / reception antenna 7 is distributed to the broadcast reception unit 11 and the bidirectional communication unit 12, and each of the reception signals is processed. The bidirectional communication unit 12 generates response data and generates a duplexer. Broadcast transmission and two-way communication can be performed by transmitting by the transmission / reception antenna 7 via 8. Further, since reception and transmission are performed by the transmission / reception antenna 7, the transmission / reception terminal device can be downsized.
[0022]
In FIG. 3, the transmission signal from the bidirectional communication unit 12 is input to the transmission / reception antenna 7 via the duplexer 8, but the transmission / reception antenna 7 is divided into a reception antenna and a transmission antenna, The received reception signal may be input to the low noise amplifier 9 and the transmission signal from the bidirectional communication unit 12 may be input to the transmission antenna. In this case, the duplexer 8 becomes unnecessary.
[0023]
Embodiment 2. FIG.
A transmission / reception terminal apparatus according to Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 4 is a block diagram showing a configuration of a transmission / reception terminal device according to Embodiment 2. In FIG. 4, 30 is a first bidirectional communication unit that performs bidirectional communication with the gateway station 1 via the communication satellite 2, and 31 is bidirectional with the gateway station 1 via the communication satellite 2. 2 is a second bidirectional communication unit that performs communication of the first bidirectional communication unit 30 and the second bidirectional communication unit 31 and switches the transmission signal output to the high output amplifier 13. It is a vessel. In FIG. 4, the part or part which attached | subjected the code | symbol same as FIG. 3 shows the part or part equivalent or equivalent to those in FIG.
[0024]
For example, a case where a bidirectional communication unit for operation management is provided as the first bidirectional communication unit 30 and a bidirectional communication unit for emergency notification is provided as the second bidirectional communication unit 31 is conceivable. The operation of the broadcast receiving unit 11 and the operations of the blocks 21 to 29 in the first bidirectional communication unit 30 and the second bidirectional communication unit 31 are the same as those described in the first embodiment. Therefore, explanation is omitted. The distributor 10 distributes the received signal received by the dual receiving antenna 7 into three systems, which are input to the broadcast receiving unit 11, the first bidirectional communication unit 30, and the second bidirectional communication unit 31, respectively. The transmission signal from the first bidirectional communication unit 30 and the transmission signal from the second bidirectional communication unit 31 are input to the switch 32, and one of the transmission signals is selected by switching, and the high output amplifier 13 is selected. Output to. The output of the high-power amplifier 13 is transmitted from the transmission / reception antenna 7 to the communication satellite 2 via the duplexer 8. With this configuration, it is possible to perform one broadcast reception and two-way bidirectional communication.
[0025]
In FIG. 4, although the antenna is shared by the transmission / reception antenna 7, the transmission / reception antenna 7 is divided into a reception antenna and a transmission antenna, and a reception signal received by the reception antenna is input to the low-noise amplifier 9, You may comprise so that the transmission signal from the bidirectional | two-way communication part 30 and the 2nd bidirectional | two-way communication part 31 may be input into a transmission antenna via the switch 32 and the high output amplifier 13. FIG. In this case, the duplexer 8 becomes unnecessary.
[0026]
【The invention's effect】
According to the first or second aspect of the present invention, the received signal received by the transmission / reception antenna is distributed to the broadcast receiving unit and the bidirectional communication unit, and the received signal is processed, respectively. Since the unit generates response data and transmits the response data via the duplexer using the transmission / reception antenna, broadcast reception and bidirectional communication can be performed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a satellite communication system in which a transmission / reception terminal device according to Embodiment 1 of the present invention is used.
FIG. 2 is a schematic diagram of signals transmitted and received in the transmission / reception terminal apparatus according to Embodiment 1 of the present invention.
FIG. 3 is a block diagram showing a configuration of a transmission / reception terminal apparatus according to Embodiment 1 of the present invention.
FIG. 4 is a block diagram showing a configuration of a transmission / reception terminal device according to Embodiment 2 of the present invention.
[Explanation of symbols]
7 Transmitting / receiving antenna 8 Divider 10 Divider 11 Broadcast receiving unit 12 Bidirectional communication unit 30 First bidirectional communication unit 31 Second bidirectional communication unit 32 Switch

Claims (2)

衛星からの電波を送受信する送受信アンテナと、この送受信アンテナにより送受信する信号を分波する分波器と、この分波器からの受信信号を分配する分配器と、選局操作入力に基いて受信チャネルが設定されて、上記分配器からの１の出力を低周波変換し、データ伸長し、映像再生及び音声再生してゲートウェイ局からの放送を放送受信する放送受信部と、上記分配器からの他の１の出力を低周波変換し、管理コマンドを再生し、応答信号を生成する双方向通信部とを備え、上記放送受信部により放送受信しつつ、上記双方向通信部により生成した応答信号を上記分波器を介して上記送受信アンテナから上記衛星へ送信することを特徴とする送受信端末装置。A transmission / reception antenna for transmitting / receiving radio waves from a satellite, a demultiplexer for demultiplexing a signal transmitted / received by the transmission / reception antenna, a distributor for distributing a reception signal from the demultiplexer, and receiving based on a channel selection operation input A channel is set, the output of 1 from the distributor is converted to a low frequency, the data is decompressed, the video is reproduced and the audio is reproduced and the broadcast from the gateway station is received, and the broadcast from the distributor A response signal generated by the bidirectional communication unit while receiving the broadcast by the broadcast receiving unit, and a bidirectional communication unit that converts the other one of the outputs to a low frequency, reproduces a management command, and generates a response signal Is transmitted from the transmission / reception antenna to the satellite via the duplexer. 衛星からの電波を受信する受信アンテナと、この受信アンテナにより受信した受信信号を分配する分配器と、選局操作入力に基いて受信チャネルが設定されて、上記分配器からの１の出力を低周波変換し、データ伸長し、映像再生及び音声再生してゲートウェイ局からの放送を放送受信する放送受信部と、上記分配器からの他の１の出力を低周波変換し、管理コマンドを再生し、応答信号を生成する双方向通信部とを備え、上記放送受信部により放送受信しつつ、上記双方向通信部により生成した応答信号を送信アンテナを介して衛星へ送信することを特徴とする送受信端末装置。A receiving antenna that receives radio waves from a satellite, a distributor that distributes a reception signal received by the receiving antenna, and a receiving channel that is set based on a channel selection operation input, the output of 1 from the distributor is reduced. Performs frequency conversion, data decompression, video playback and audio playback to receive broadcasts from the gateway station , and another one of the outputs from the distributor to perform low frequency conversion to reproduce management commands A transmission / reception unit for generating a response signal, and transmitting / receiving the response signal generated by the bidirectional communication unit to a satellite via a transmission antenna while receiving the broadcast by the broadcast reception unit Terminal device.
JP2003119603A 2003-04-24 2003-04-24 Transmission / reception terminal device Expired - Fee Related JP4559037B2 (en)

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