JP2004007531A

JP2004007531A - Satellite signal receiving antenna, converter, satellite signal receiving system, and satellite signal retransmission system

Info

Publication number: JP2004007531A
Application number: JP2003092002A
Authority: JP
Inventors: Kenji Suzuki; 鈴木　賢治; Toshihiro Sugiura; 杉浦　敏博
Original assignee: Maspro Denkoh Corp
Current assignee: Maspro Denkoh Corp
Priority date: 2002-03-29
Filing date: 2003-03-28
Publication date: 2004-01-08
Anticipated expiration: 2023-03-28
Also published as: JP4050645B2

Abstract

【課題】ＣＳ，ＢＳ右偏波信号に加えてＢＳ左偏波信号を受信しても、２ＧＨｚ帯の移動体向衛星放送信号を混合して１本の信号ケーブルで引き込み、屋内でもＢＳ，ＣＳ信号と共に移動体向衛星放送を良好に受信することを可能とする。
【解決手段】衛星信号受信アンテナ１で受信した左偏波信号を９．５７６ＧＨｚのローカル周波数でＩＦ変換すると共に、受信した右偏波信号を１０．６７８ＧＨｚのローカル周波数でＩＦ変換し、双方の受信信号を混合して出力した。この混合した衛星信号に移動体向衛星放送受信アンテナ２で受信した２ＧＨｚ帯の移動体向け音声放送信号を混合して１本の信号ケーブル９ｂで屋内に引き込み、屋内に設けた再送信アンテナ８に接続して２ＧＨｚ帯の移動体向け音声放送信号を再放射した。
【選択図】　図１[PROBLEMS] Even if a BS left polarized signal is received in addition to a CS or BS right polarized signal, a 2 GHz band mobile-facing satellite broadcast signal is mixed and pulled in with one signal cable, and the BS and CS signals are used indoors. It is possible to satisfactorily receive a mobile-targeted satellite broadcast together with a signal.
A left-polarized signal received by a satellite signal receiving antenna is IF-converted at a local frequency of 9.576 GHz, and a received right-polarized signal is IF-converted at a local frequency of 10.678 GHz to receive both signals. The signals were mixed and output. The mixed satellite signal is mixed with a 2 GHz band audio broadcast signal for a mobile object received by the mobile object satellite broadcast receiving antenna 2, pulled into a room with one signal cable 9 b, and transmitted to a retransmission antenna 8 provided indoors. By connecting, a 2 GHz band audio broadcast signal for mobiles was re-emitted.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は、移動体向衛星放送（周波数帯域２．６３〜２．６５５ＧＨｚ）を受信して、ＢＳ，ＣＳの衛星信号に混合して１本の信号ケーブルで屋内に引き込み、屋内でも衛星デジタル音声放送信号を受信可能とする技術に関する。
【０００２】
【従来の技術】
携帯情報端末等のモバイル機器を対象とした周波数帯域２．６３〜２．６５５ＧＨｚの移動体向衛星放送である衛星デジタル音声放送が計画されている。また、この衛星デジタル音声放送を受信するモバイル機器としては、例えば特許文献１の図４に示すような受信装置が提案されているが、衛星放送は屋内では電波が弱くなるため、特許文献１に示すようなモバイル機器を屋内に持ち込んで、その衛星デジタル音声放送を受信しようとした場合、良好に受信するためには屋外に衛星デジタル音声放送を受信するアンテナを設置し、その受信信号を信号ケーブルで屋内に引き込んで有線により受信しなければならなかった。
【０００３】
【特許文献１】
特開平１０−３０８９４１号公報
【０００４】
【発明が解決しようとする課題】
しかし、屋外に衛星デジタル音声放送を受信するアンテナを設置して、その受信信号を屋内に引込む場合、信号ケーブルの引き込み作業は面倒であるし、引き込んだ信号ケーブルは屋内の壁等に配設して引回すことになるため見栄えも悪い。また、有線とすることで携帯機器としての機能が損なわれてしまっていた。
【０００５】
そのため、既設のＢＳ，ＣＳ等の衛星信号受信システムのアンテナから屋内に引き込まれている信号ケーブルに衛星デジタル音声放送信号を混合して屋内に伝送して、新たな信号ケーブルの引き込みを無くす方法が考えられるが、ＢＳ，ＣＳ双方の受信信号を１本の信号ケーブルで伝送する受信システムの場合、伝送周波数の周波数スペクトラムは例えば図６に示すように１．０３５〜２．５９０ＧＨｚとなっている。但し、これはＢＳ左偏波信号を含まない場合であり、従来のＢＳ右偏波信号に加えて予定されているＢＳ左偏波信号も受信して伝送しようとした場合、上記構成では伝送周波数帯の上端が３ＧＨｚを超えてしまう。
ところが、衛星デジタル音声放送信号は２．６３〜２．６５５ＧＨｚの周波数であるため、上記従来のＢＳ，ＣＳ信号に加えてＢＳ左偏波も伝送するシステムでは１本の信号ケーブルに衛星デジタル音声放送信号を周波数変換せずに混合して伝送することは難しい。
【０００６】
そこで、本発明は上記問題点に鑑み、ＢＳ，ＣＳの様な左右偏波を有する２つの衛星信号を受信して１本の信号ケーブルで屋内に引込む衛星信号受信システムにおいて、２ＧＨｚ帯の移動体向衛星放送信号を混合して１本の信号ケーブルで引き込み、屋内でも移動体向衛星放送を良好に受信することが可能な衛星信号受信システムを提供すること、またそのシステムに好適な衛星信号受信アンテナ、コンバータ、更には屋内にて引込んだ移動体向衛星放送電波を再放射して、屋内でもモバイル機器により良好な受信が可能な衛星信号再送信システムを提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記課題を解決するため、請求項１に係る衛星信号受信アンテナは、少なくとも左右何れかの偏波信号を出力する第１及び第２の衛星からの信号を受信する右偏波信号受信部及び左偏波信号受信部を有し、受信した右偏波信号が受信した左偏波信号より高い周波数に配列されるように双方の受信信号をＩＦ変換して出力することを特徴とする。
この衛星信号受信アンテナによれば、受信した左偏波信号を周波数軸上で右偏波信号より上方にＩＦ変換するので、衛星信号の左右偏波に重なる周波数帯があっても分離されるので、１本の信号ケーブルで全ての受信信号を伝送することが可能となる。従って、例えば第１衛星及び第２衛星からの信号がＢＳ及びＣＳ信号であって、受信周波数にＢＳ左偏波信号を有していても、１本の信号ケーブルで全ての受信信号を伝送することが可能となる。
また、この際ＩＦ変換するローカル周波数を選択することで、例えば移動体向衛星放送を、ＢＳ左偏波周波数帯とＣＳ左偏波周波数帯のガードバンド内に配置することもでき、１本の信号ケーブルでＢＳ及びＣＳ信号に影響を及ぼすことなく移動体向衛星放送信号を更に混合して伝送することが可能となる。
【０００８】
請求項２の発明は、請求項１に記載の衛星信号受信アンテナにおいて、第１及び第２の衛星からの信号がＢＳ信号及びＣＳ信号であり、受信した右偏波信号を略１０．６７８ＧＨｚのローカル周波数でＩＦ変換すると共に、受信した左偏波信号を略９．５７６ＧＨｚのローカル周波数でＩＦ変換することを特徴とする。
この構成によれば、２．６３〜２．６５５ＧＨｚ帯での移動体向衛星放送があった場合に、ＢＳ左偏波周波数帯とＣＳ左偏波周波数帯のガードバンド内にこの移動体向衛星放送は配置されるので、１本の信号ケーブルでＢＳ及びＣＳ信号に影響を及ぼすことなく移動体向衛星放送信号を混合して良好に伝送することが可能となる。
従って、ＢＳ右偏波信号、ＣＳ左右偏波信号に加えてＢＳ左偏波信号を１本の信号ケーブルで屋内に引込む形態であっても、移動体向衛星放送信号を更にその信号ケーブルに混合して伝送できるので、衛星デジタル音声放送信号を新たに信号ケーブルを引き込むことなく屋内での受信が可能となる。
【０００９】
請求項３の発明は、請求項１又は２記載の発明において、ＩＦ変換した右偏波信号とＩＦ変換した左偏波信号とを混合する混合手段を有し、受信信号を１本の信号ケーブルで出力することを特徴とする。この構成により、アンテナから直接１本の信号ケーブルで全ての受信信号を出力できる。
【００１０】
請求項４の発明に係るコンバータは、２つの信号入力部と２つの信号出力部を有し、一方の信号入力部に入力された信号を略１０．６７８ＧＨｚのローカル周波数でＩＦ変換すると共に、他方の信号入力部に入力された信号を略９．５７６ＧＨｚのローカル周波数でＩＦ変換することを特徴とする。
このコンバータによれば、ＢＳ及びＣＳ信号を受信した場合、周波数軸上でＢＳ右偏波信号，ＣＳ右偏波信号、ＢＳ左偏波信号、ＣＳ左偏波信号の順に高い周波数帯にＩＦ変換するので、ＢＳ及びＣＳ信号を混合して１本の信号ケーブルで伝送することが可能になる。更に、ＩＦ変換したＢＳ右偏波信号とＣＳ右偏波信号の間のガードバンド内に２．６３〜２．６５５ＧＨｚの周波数帯で伝送される衛星デジタル音声放送信号を配置できるので、衛星デジタル音声放送信号も合わせて混合して１本の信号ケーブルで伝送することが可能となる。
【００１１】
ここで、衛星デジタル音声放送信号は、２ＧＨｚ帯の放送以外に、電波が直接届かない不感エリアに対して実施されるギャップフィラー装置を対象として１２ＧＨｚ帯でも同様な放送が実施され、ギャップフィラー装置にて２ＧＨｚ帯に周波数変換されて再放射され、モバイル機器で受信可能としている。そのため、衛星デジタル音声放送は２つの周波数帯にて実施されることになる。
そこで、請求項５の発明に係る衛星信号受信システムは、ＢＳ及びＣＳ信号を受信する右偏波信号受信部及び左偏波信号受信部を有し、受信した右偏波信号を略１０．６７８ＧＨｚのローカル周波数でＩＦ変換すると共に、受信した左偏波信号を略９．５７６ＧＨｚのローカル周波数でＩＦ変換するアンテナ部と、ＩＦ変換した前記受信信号を混合して出力する第１混合手段と、２ＧＨｚ帯或いは１２ＧＨｚ帯の移動体向衛星放送信号を受信して２ＧＨｚ帯の移動体向衛星放送と同一の周波数で出力する移動体向衛星放送受信アンテナと、該アンテナの出力信号と前記第１混合手段からの信号とを混合する第２混合手段と、を備えて成ることを特徴とする。
この衛星信号受信システムによれば、左右偏波のＢＳ及びＣＳ信号に加えて移動体向衛星放送信号である衛星デジタル音声放送信号を１本の信号ケーブルで屋内に引き込むことが可能となり、ＢＳ左偏波或いは衛星デジタル音声放送信号を新たに受信する場合に信号ケーブルを引き込むことなく屋内で受信できる。
【００１２】
請求項６の発明は、請求項５の発明において、移動体向衛星放送受信アンテナの受信する移動体向衛星放送信号が２ＧＨｚ帯の信号であり、前記移動体向衛星放送受信アンテナはＩＦ変換せずに第２混合手段へ受信信号を出力することを特徴とする。
この構成によれば、移動体向衛星放送受信アンテナにコンバータ回路を設ける必要が無く、システムを安価に構成できる。
【００１３】
請求項７の発明に係る衛星信号再送信システムは、ＢＳ及びＣＳ信号を受信する右偏波信号受信部及び左偏波信号受信部を有し、受信した右偏波信号を略１０．６７８ＧＨｚのローカル周波数でＩＦ変換すると共に、受信した左偏波信号を略９．５７６ＧＨｚのローカル周波数でＩＦ変換するアンテナ部と、ＩＦ変換した前記受信信号を混合して出力する第１混合手段と、１２ＧＨｚ帯の移動体向衛星放送信号を受信して、２ＧＨｚ帯にＩＦ変換して出力する移動体向衛星放送受信アンテナと、該アンテナからの出力信号と前記第１混合手段からの信号とを混合する第２混合手段と、該第２混合手段で混合した信号を１本の信号ケーブルで伝送して屋内に引き込み、引き込んだ信号ケーブルに接続して２ＧＨｚ帯の移動体向け衛星受信信号を再放射する再送信アンテナと、を備えて成ることを特徴とする。
【００１４】
この衛星信号再送信システムによれば、１本の信号ケーブルで、ＢＳ，ＣＳ信号に加えて移動体向衛星放送である衛星デジタル音声放送信号を屋内に伝送し、屋内にて衛星デジタル音声放送信号電波を放射するので、屋内でもモバイル機器により衛星デジタル音声放送を受信できる。尚、ここで言う屋内は、住宅等の内部空間に加えて地下街等の閉塞空間も含む。
そして、受信する信号周波数と出力及び送信する周波数が異なるので、双方の電波が混在しても、再放射電波が移動体向衛星放送受信アンテナの受信動作に悪影響を及ぼすようなこともない。また、その際衛星デジタル音声放送信号は、ＢＳ，ＣＳ信号と共に１本の信号ケーブルで引き込まれるので、衛星デジタル音声放送信号のために新たに信号ケーブルを引き込む必要が無く、容易に実施できる。
【００１５】
請求項８の発明に係る衛星信号再送信システムは、ＢＳ及びＣＳ信号を受信する右偏波信号受信部及び左偏波信号受信部を有し、受信した右偏波信号を略１０．６７８ＧＨｚのローカル周波数でＩＦ変換すると共に、受信した左偏波信号を略９．５７６ＧＨｚのローカル周波数でＩＦ変換するアンテナ部と、ＩＦ変換した前記受信信号を混合して出力する第１混合手段と、２ＧＨｚ帯の移動体向衛星放送信号を受信して、ＩＦ変換せずに出力する移動体向衛星放送受信アンテナと、該アンテナからの出力信号と前記第１混合手段からの信号とを混合する第２混合手段と、該第２混合手段で混合した信号を１本の信号ケーブルで伝送して屋内に引き込み、引き込んだ信号ケーブルに接続して、受信した周波数で再放射する再送信アンテナと、を備えて成ることを特徴とする。
【００１６】
この衛星信号再送信システムによれば、ＢＳ，ＣＳ信号に加えて１本の信号ケーブルで移動体向衛星放送信号である衛星デジタル音声放送を屋内に伝送し、屋内にて衛星デジタル音声放送信号電波を放射するので、屋内でもモバイル機器により衛星デジタル音声放送を受信できる。
そして、受信した衛星デジタル音声放送信号をＩＦ変換せずに伝送及び送信するので、コンバータ回路を必要とせず、簡易な回路構成にできるので、安価にシステムを構成でき、外部に再放射電波が漏れることのないエリアに対して好適に適用できる。また、その際衛星デジタル音声放送信号は、ＢＳ，ＣＳ信号と共に１本の信号ケーブルで引き込まれるので、衛星デジタル音声放送信号のために新たに信号ケーブルを引き込む必要が無く、システムの実施が容易である。
【００１７】
【発明の実施の形態】
以下、本発明を具体化した実施の形態を、図面に基づいて詳細に説明する。図１は本発明に係る衛星信号受信システム及び衛星信号再送信システムの１例を示すブロック図であり、１は第１衛星からのＢＳ信号及び第２衛星からのＣＳ信号を受信する衛星信号受信アンテナ、２は移動体向衛星放送信号である衛星デジタル音声放送信号を受信する移動体向衛星放送受信アンテナ、３，４はブースタ、５はフィルタ回路、６は第２混合手段としての混合器、７は分岐器、そして８は受信した信号を再放射する再送信アンテナ、１７は住戸内や地下街等の屋内を示している。
【００１８】
衛星信号受信アンテナ１は、図２のブロック図に示すように、１対の受信プローブ１０とコンバータ部１１と第１混合手段としての混合部１２とから構成され、一対のプローブ１０は左偏波受信用の第１プローブ１０ａ、右偏波受信用の第２プローブ１０ｂから成る。また、コンバータ部１１は、第１局発部１１ａ、第２局発部１１ｂを有し、第１プローブ１０ａで受信した信号と、第２プローブ１０ｂで受信した信号は夫々独立したローカル周波数でＩＦ変換される。また、１３は増幅回路である。
混合部１２は、第１プローブ１０ａ側にハイパスフィルタ１２ａを設け、第２プローブ１０ｂ側にローパスフィルタ１２ｂを設けて混合している。
【００１９】
第１プローブ１０ａで受信された左偏波信号は第１局発部１１ａのローカル周波数９．５７６３８ＧＨｚでＩＦ変換され、第２プローブ１０ｂで受信された右偏波信号は第２局発部１１ｂのローカル周波数１０．６７８ＧＨｚでＩＦ変換される。こうして、図３（ａ）に示す周波数スペクトラムで受信されたＢＳ，ＣＳ信号は図３（ｂ）に示す周波数帯にＩＦ変換され、１本の同軸ケーブルである信号ケーブル９ａに出力されて伝送される。
そして、移動体向衛星放送受信アンテナ２で受信された衛星デジタル音声放送信号は周波数変換されることなくブースタ４で増幅されて出力され、上記ＢＳ，ＣＳ信号と混合されて、図３（ｃ）に示す周波数スペクトラムで屋内に１本の信号ケーブル９ｂで引込まれる。
【００２０】
図３（ｃ）の周波数スペクトラムに示すように、衛星デジタル音声放送信号は２．６３〜２．６５５ＧＨｚの比較的挟帯域であるため、この周波数はＢＳ左偏波信号のハイエンド周波数２．６１１ＧＨｚとＣＳ左偏波信号のローエンド周波数２．６７３ＧＨｚの間のガードバンド内に配置でき、受信周波数にＢＳ左偏波信号を有していても、１本の信号ケーブルでＢＳ及びＣＳ信号に影響を及ぼすことなく衛星デジタル音声放送信号を混合して良好に伝送することができる。
【００２１】
再送信アンテナ８は、２つのバンドパスフィルタ８ａ，８ｂと信号増幅器８ｃを介して屋内で信号ケーブル９ｂに分岐器７を介して接続されている。２つのバンドパスフィルタ８ａ，８ｂは２．６３ＧＨｚ〜２．６６５ＧＨｚの周波数帯の信号を通過させるよう構成され、信号増幅器８ｃはその周波数帯の信号を増幅する。こうして、再送信アンテナ８は、衛星から送信される衛星デジタル音声放送周波数と同一周波数の２．６３ＧＨｚ〜２．６６５ＧＨｚで再放射される。尚、信号増幅器８ｃは信号ケーブル９ｂにより伝送されてきた信号状況により無くすことが可能である。
【００２２】
このように、上記衛星信号受信アンテナは、受信した左偏波信号を周波数軸上で右偏波信号より上方にＩＦ変換するので、衛星信号の左右偏波に重なる周波数帯があっても分離されるので、１本の信号ケーブルで全ての受信信号を伝送することが可能となる。従って、第１衛星及び第２衛星からの信号がＢＳ及びＣＳ信号の場合、受信周波数にＢＳ左偏波信号を有していても、共通する周波数帯がなくなり、１本の信号ケーブルで全ての受信信号を伝送することができる。
そして、その際に左偏波信号は９．５７６３８ＧＨｚでＩＦ変換し、右偏波信号は１０．６７８ＧＨｚでＩＦ変換するので、受信信号にＢＳ左偏波信号を有していても、２．６３〜２．６５５ＧＨｚの衛星デジタル音声放送信号を混合して伝送させることができる。
【００２３】
従って、新たに信号ケーブルを引き込むことなく、衛星デジタル音声放送信号を屋内に引き込むことができるし、衛星デジタル音声放送信号を再放射するので、屋内でもモバイル機器にて屋外と同様に容易に衛星デジタル音声放送を受信できる。尚、引き込んだ信号ケーブルにモバイル機器を直接接続すれば再送信アンテナを設けなくても衛星デジタル音声放送が受信できることは言うまでもない。また、受信した信号を周波数変換せずに伝送及び送信するので、コンバータ回路を必要とせず、衛星信号再送信システムを簡易に構成できるので、外部（特に移動体向衛星放送受信アンテナ設置部）に再放射電波が漏れることのない例えば地下街等のエリアに対して好適である。
【００２４】
図４は上記衛星信号受信アンテナ１のコンバータ部１１及び混合部１２を一体化したコンバータ１４のブロック図を示している。図４に示すように、２つの信号入力部１５ａ，１５ｂ及び１つの信号出力部１６を設け、コンバータ１４に混合部１２を内蔵して形成し、上記図２と同一の構成要素には同一の符号を付してある。
このように、受信プローブを有するアンテナ本体からコンバータ部を独立させて形成しても良く、一方の信号入力部にＢＳ右偏波信号，ＣＳ右偏波信号を入力させ、他方の信号入力部にＢＳ左偏波信号、ＣＳ左偏波信号を入力させれば、周波数軸上でＢＳ右偏波信号，ＣＳ右偏波信号、ＢＳ左偏波信号、ＣＳ左偏波信号の順に高い周波数でＩＦ変換し、混合して１本の信号ケーブルで伝送することが可能になると共に、衛星デジタル音声放送の周波数帯域がＩＦ変換したＢＳ左偏波信号とＣＳ左偏波信号の間のガードバンド内となるので、衛星デジタル音声放送信号も合わせて混合して１本の信号ケーブルで伝送することが可能となる。
【００２５】
尚、上記コンバータは混合回路１２を内蔵しているが、混合回路１２は別体として形成しても良く、その場合コンバータの信号出力部は入力部と同様に２つ設ければよい。
また、上記図１の実施形態は１つのアンテナでＢＳ，ＣＳ双方の衛星信号を受信するシステムについて説明したが、ＢＳ，ＣＳを個別のアンテナで受信して１本の信号ケーブルで伝送するシステムであっても、上記コンバータを用いることで、左偏波信号と右偏波信号の周波数帯を重ならないように分離して１本の信号ケーブルで出力することができるし、更に衛星デジタル音声放送信号を周波数変換することなく混合して伝送することができる。
【００２６】
図５は、衛星信号受信システム及び衛星信号再送信システムの他の形態を示し、その要部である移動体向衛星放送受信装置を示している。図５において、２０は移動体向衛星放送受信アンテナ、２１は信号処理器であり、信号処理器２１の出力は図１に示す混合器６に接続され、ＢＣ，ＣＳ受信信号に混合される。尚、ＢＳ，ＣＳ信号を受信する衛星信号受信アンテナ及び室内の再放射アンテナの構成は図１と同様であり省略してある。
【００２７】
図５の移動体向衛星放送受信アンテナ２０は、図１の移動体向衛星放送受信アンテナ２とは異なり、ギャップフィラー向けに送信されている１２ＧＨｚ帯の信号を受信するよう構成され、２．６３〜２．６５５ＧＨｚの周波数に周波数変換して出力している。この移動体向衛星放送受信アンテナ２０は、同様に１２ＧＨｚ帯で放射されるＣＳ信号を受信する周知のＣＳ受信アンテナをそのまま使用でき、ここではＣＳ受信アンテナを使用した例を示している。そのため、内蔵されるコンバータ回路でＩＦ変換されて１．０〜１．５５ＧＨｚの周波数帯で出力される。
そして、信号処理器２１は、チューナ２２、ＴＤＭ復調器２３、ＣＤＭ変調器２４、出力増幅器２５を有し、ＣＤＭ変調器２４で２．６３〜２．６５５ＧＨｚの周波数に変換されて出力される。
【００２８】
このように、受信する信号周波数と伝送及び再放射する周波数が異なるので、衛星からの電波と再放射電波が混在する例えば一般の住宅ような環境で使用しても、再放射電波が移動体向衛星放送受信アンテナの受信動作に悪影響を及ぼすようなことがなく、良好に再送信でき、室内にてモバイル機器を使用できる。
また、その際衛星デジタル音声放送信号は、ＢＳ，ＣＳ信号と共に１本の信号ケーブルで引き込まれるので、衛星デジタル音声放送信号のために新たに信号ケーブルを引き込む必要が無く、容易に実施できる。
【００２９】
尚、上記実施形態では、第１及び第２衛星（ＢＳ及びＣＳ）から受信した左偏波をＩＦ変換するローカル周波数を１０．６７８ＧＨｚ、右偏波をＩＦ変換するローカル周波数を９．５７６ＧＨｚとして、挟帯域な信号である移動体向衛星放送信号を合わせて伝送可能としているが、左右偏波のガードバンド内に配置可能な信号であれば、ローカル周波数を適当に選択することで移動体向衛星放送信号で無くともＢＳ及びＣＳ受信信号に合わせて１本の信号ケーブルで伝送することができる。
また、移動体向衛星放送受信アンテナにＣＳ受信アンテナを使用することで、大量生産される安価なアンテナを使用でき、コンバータを備えたシステムであってもコスト高にならないようにしているが、１２ＧＨｚ帯から直接２，６３〜２．６５５ＧＨｚに周波数変換する専用のアンテナを用いても良い。
更に、上記実施形態は、第１局発部のローカル周波数を９．５７６３８ＧＨｚ、第２局発部のローカル周波数を１０．６７８ＧＨｚとしているが、上述するようにこの周波数は衛星デジタル音声放送信号の中間周波数をガードバンド内の中央に配置させる周波数であり、衛星デジタル音声放送信号がＢＳ左偏波とＣＳ左偏波の間のガードバンド内に配置されれば双方の信号を混合して伝送することが可能であり、第１及び第２局発部のローカル周波数は上記数値の近傍の周波数でも良い。
【００３０】
【発明の効果】
以上詳述したように、本発明の衛星信号受信アンテナによれば、受信した左偏波信号を受信した右偏波信号より高い周波数にＩＦ変換するので、共通する周波数帯が無くなり、１本の信号ケーブルで全ての受信信号を伝送可能となる。従って、第１及び第２の衛星からの信号がＢＳ及びＣＳ信号である場合に、受信偏波にＢＳ左偏波信号が含まれていても、１本の信号ケーブルで全ての受信信号を伝送できる。
また、右偏波をＩＦ変換するローカル周波数を１０．６７８ＧＨｚ、左偏波をＩＦ変換するローカル周波数を９．５７６ＧＨｚとすることで、２．６３〜２．６５５ＧＨｚの周波数帯を有する衛星デジタル音声放送は、ＢＳ左偏波周波数帯とＣＳ左偏波周波数帯のガードバンド内に配置され、１本の信号ケーブルでＢＳ及びＣＳ信号に影響を及ぼすことなく衛星デジタル音声放送信号も混合して良好に伝送することができる。
従って、ＢＳ右偏波信号、ＣＳ左右偏波信号に加えてＢＳ左偏波信号を１本の信号ケーブルで屋内に引込む形態であっても、衛星デジタル音声放送信号を更にその信号ケーブルに混合して伝送できるので、衛星デジタル音声放送信号を新たに信号ケーブルを引き込むことなく屋内での受信が可能となる。
【００３１】
また、本発明のコンバータによれば、ＢＳ及びＣＳ信号を受信した場合、周波数軸上でＢＳ右偏波信号，ＣＳ右偏波信号、ＢＳ左偏波信号、ＣＳ左偏波信号の順に高い周波数帯にＩＦ変換するので、ＢＳ及びＣＳ信号を混合して１本の信号ケーブルで伝送することが可能になる。更に、ＩＦ変換したＢＳ右偏波信号とＣＳ右偏波信号の間のガードバンド内に２．６３〜２．６５５ＧＨｚの周波数帯で伝送される衛星デジタル音声放送信号を配置できるので、衛星デジタル音声放送信号も合わせて混合して１本の信号ケーブルで伝送することが可能となる。
【００３２】
また、本発明の衛星信号受信システムによれば、左右偏波のＢＳ及びＣＳ信号に加えて衛星デジタル音声放送信号を合わせて１本の信号ケーブルで屋内に引き込むことが可能となり、ＢＳ左偏波或いは衛星デジタル音声放送信号を新たに受信する場合に信号ケーブルを引き込む必要が無く、屋内で容易に受信できる。
【００３３】
更に、本発明の衛星信号再送信システムによれば、ＢＳ，ＣＳ信号に加えて１本の信号ケーブルで衛星デジタル音声放送信号を屋内に伝送し、屋内にて衛星デジタル音声放送信号電波を放射するので、屋内でもモバイル機器により衛星デジタル音声放送を受信できる。また、その際移動体向衛星放送信号は、ＢＳ，ＣＳ信号と共に１本の信号ケーブルで引き込まれるので、移動体向衛星放送信号受信のために新たに信号ケーブルを引き込む必要が無く、システムを容易に実施できる。
そして、特に受信する信号周波数と出力及び送信する周波数が異なる場合は、双方の電波が混在するような環境でも、再放射電波が移動体向衛星放送受信アンテナの受信動作に悪影響を及ぼすようなこともない。
【図面の簡単な説明】
【図１】本発明の実施形態の１例を示す衛星信号受信システム及び衛星信号再送信システムのブロック図である。
【図２】図１に示す衛星信号受信アンテナのブロック図である。
【図３】受信信号の変化を示し、（ａ）はＢＳ，ＣＳ信号の受信周波数スペクトラム、（ｂ）はＢＳ，ＣＳ信号をＩＦ変換した周波数スペクトラムである。（ｃ）はＩＦ変換したＢＳ，ＣＳ信号に衛星デジタル音声放送信号を加えた周波数スペクトラムである。
【図４】本発明のコンバータの１例を示すブロック図である。
【図５】本発明の衛星信号受信システム及び衛星信号再送信システムの他の例を示し、その要部である移動体向衛星放送受信アンテナのブロック図である。
【図６】従来の衛星信号受信アンテナのＩＦ変換した出力信号の１例を示す周波数スペクトラムである。
【符号の説明】
１・・衛星信号受信アンテナ、２・・移動体向衛星放送受信アンテナ、６・・第２混合手段としての混合器、８・・再送信アンテナ、９ａ，９ｂ・・信号ケーブル、１０・・プローブ、１０ａ・・第１プローブ、１０ｂ・・第２プローブ、１１・・コンバータ部、１１ａ・・第１局発部、１１ｂ・・第２局発部、１２・・第１混合手段としての混合部、１５ａ，１５ｂ・・信号入力部、１６・・信号出力部、１７・・屋内、２０・・移動体向衛星放送受信アンテナ、２４・・ＣＤＭ変調器。[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a satellite broadcast for mobiles (frequency band of 2.63 to 2.655 GHz) is received, mixed with satellite signals of BS and CS, and drawn indoors with a single signal cable. The present invention relates to a technique for enabling reception of a broadcast signal.
[0002]
[Prior art]
2. Description of the Related Art Satellite digital audio broadcasting, which is a mobile-targeted satellite broadcasting having a frequency band of 2.63 to 2.655 GHz for mobile devices such as portable information terminals, is planned. As a mobile device that receives this satellite digital audio broadcast, for example, a receiving device as shown in FIG. 4 of Patent Document 1 has been proposed. If you bring a mobile device as shown below indoors and try to receive the satellite digital audio broadcast, install an antenna to receive the satellite digital audio broadcast outdoors and transmit the received signal to a signal cable in order to receive it well. Had to be pulled indoors and received by wire.
[0003]
[Patent Document 1]
JP-A-10-308941
[0004]
[Problems to be solved by the invention]
However, when installing an antenna for receiving satellite digital audio broadcasting outdoors and pulling the received signal indoors, the work of pulling in the signal cable is troublesome, and the pulled-in signal cable must be installed on an indoor wall or the like. It looks bad because it will be circulated. In addition, the function as a portable device has been impaired by using a wired connection.
[0005]
For this reason, there is a method of mixing a satellite digital audio broadcast signal with a signal cable drawn indoors from an antenna of a satellite signal receiving system such as an existing BS or CS and transmitting the mixed signal indoors to eliminate the need to pull in a new signal cable. Although it is conceivable, in the case of a receiving system that transmits both received signals of BS and CS through one signal cable, the frequency spectrum of the transmission frequency is, for example, 1.035 to 2.590 GHz as shown in FIG. However, this is the case where the BS left polarized signal is not included, and when the intended BS left polarized signal is to be received and transmitted in addition to the conventional BS right polarized signal, the transmission frequency is not used in the above configuration. The upper end of the band exceeds 3 GHz.
However, since a satellite digital audio broadcast signal has a frequency of 2.63 to 2.655 GHz, a satellite digital audio broadcast signal is transmitted to a single signal cable in a system that transmits a BS left-polarized wave in addition to the conventional BS and CS signals. It is difficult to mix and transmit signals without frequency conversion.
[0006]
In view of the above problems, the present invention provides a 2 GHz band mobile unit in a satellite signal receiving system that receives two satellite signals having left and right polarizations, such as BS and CS, and leads them indoors with a single signal cable. Provided is a satellite signal receiving system capable of receiving satellite broadcasting signals for mobile units satisfactorily even indoors by mixing and broadcasting satellite broadcasting signals for one direction, and receiving satellite signals suitable for the system. It is an object of the present invention to provide a satellite signal retransmission system capable of re-radiating an antenna, a converter, and a satellite broadcast wave directed to a mobile object drawn indoors, so that a mobile device can receive a signal well indoors.
[0007]
[Means for Solving the Problems]
To solve the above problem, a satellite signal receiving antenna according to claim 1 includes a right polarization signal receiving unit that receives signals from first and second satellites that output at least one of left and right polarization signals, and a left polarization signal receiving unit. It has a polarization signal receiving unit, and is characterized in that both received signals are IF-converted and output so that the received right-polarized signal is arranged at a higher frequency than the received left-polarized signal.
According to this satellite signal receiving antenna, since the received left-polarized signal is IF-converted above the right-polarized signal on the frequency axis, it is separated even if there is a frequency band overlapping the left-right polarized wave of the satellite signal. (1) All received signals can be transmitted by one signal cable. Therefore, for example, even if the signals from the first satellite and the second satellite are BS and CS signals and have a BS left polarization signal in the reception frequency, all the reception signals are transmitted by one signal cable. It becomes possible.
At this time, by selecting a local frequency to be IF-converted, for example, mobile-targeted satellite broadcasting can be arranged in the guard bands of the BS left polarization frequency band and the CS left polarization frequency band. It becomes possible to further mix and transmit the satellite broadcast signals for mobile units without affecting the BS and CS signals using the signal cable.
[0008]
According to a second aspect of the present invention, in the satellite signal receiving antenna according to the first aspect, the signals from the first and second satellites are a BS signal and a CS signal, and the received right-polarized signal is substantially 10.678 GHz. In addition to performing IF conversion at a local frequency, the received left-polarized signal is subjected to IF conversion at a local frequency of approximately 9.576 GHz.
According to this configuration, when there is a mobile-oriented satellite broadcast in the band of 2.63 to 2.655 GHz, the mobile-oriented satellite is included in the guard bands of the BS left polarization frequency band and the CS left polarization frequency band. Since the broadcast is arranged, it becomes possible to mix and broadcast the satellite broadcast signals for mobile objects without affecting the BS and CS signals with one signal cable.
Therefore, even if the BS left-polarized signal is pulled indoors with a single signal cable in addition to the BS right-polarized signal and CS left-right polarized signal, the mobile-side satellite broadcast signal is further mixed into the signal cable. Therefore, it is possible to receive the satellite digital audio broadcast signal indoors without drawing a new signal cable.
[0009]
According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided mixing means for mixing the IF-converted right-polarized signal and the IF-converted left-polarized signal, and the received signal is converted into one signal cable. Output. With this configuration, all received signals can be output directly from the antenna with one signal cable.
[0010]
A converter according to a fourth aspect of the present invention has two signal input units and two signal output units, and performs IF conversion of a signal input to one of the signal input units at a local frequency of about 10.678 GHz and the other. The signal input to the signal input unit is IF-converted at a local frequency of about 9.576 GHz.
According to this converter, when BS and CS signals are received, IF conversion is performed on the frequency axis in the order of BS right polarization signal, CS right polarization signal, BS left polarization signal, CS left polarization signal in the order of higher frequency band. Therefore, it becomes possible to mix the BS and CS signals and transmit the mixed signals through one signal cable. Furthermore, since the satellite digital audio broadcast signal transmitted in the frequency band of 2.63 to 2.655 GHz can be arranged in the guard band between the IF-converted BS right polarization signal and the CS right polarization signal, the satellite digital audio Broadcast signals can also be mixed and transmitted over a single signal cable.
[0011]
Here, in addition to the broadcasting in the 2 GHz band, the satellite digital audio broadcasting signal is also broadcast in the 12 GHz band with respect to the gap filler device which is performed in an insensitive area where radio waves do not directly reach. The frequency is converted to a 2 GHz band, re-emitted, and can be received by a mobile device. Therefore, satellite digital audio broadcasting is performed in two frequency bands.
Therefore, a satellite signal receiving system according to a fifth aspect of the present invention has a right-polarized signal receiving unit and a left-polarized signal receiving unit for receiving BS and CS signals, and converts the received right-polarized signal to approximately 10.678 GHz. An IF unit for IF-converting the received left-polarized signal at a local frequency of about 9.576 GHz; a first mixing unit for mixing and outputting the IF-converted received signal; Mobile satellite broadcast receiving antenna for receiving a mobile satellite broadcast signal in the band or 12 GHz band and outputting the same at the same frequency as the mobile satellite broadcast in the 2 GHz band; an output signal of the antenna and the first mixing means And a second mixing unit that mixes the signal with the second signal.
According to this satellite signal receiving system, in addition to the left and right polarized BS and CS signals, a satellite digital audio broadcast signal, which is a satellite broadcast signal for mobile units, can be pulled in indoors with a single signal cable. When newly receiving a polarization or satellite digital audio broadcast signal, it can be received indoors without having to pull in a signal cable.
[0012]
According to a sixth aspect of the present invention, in the fifth aspect, the mobile satellite broadcast signal received by the mobile satellite broadcast receiving antenna is a 2 GHz band signal, and the mobile satellite broadcast receiving antenna performs IF conversion. And outputting the received signal to the second mixing means.
According to this configuration, there is no need to provide a converter circuit in the satellite broadcasting receiving antenna for mobile objects, and the system can be configured at low cost.
[0013]
A satellite signal retransmission system according to a seventh aspect of the present invention has a right polarization signal receiving section and a left polarization signal receiving section for receiving BS and CS signals, and converts the received right polarization signal to approximately 10.678 GHz. An antenna unit for performing IF conversion at a local frequency and performing IF conversion on a received left-polarized signal at a local frequency of approximately 9.576 GHz; first mixing means for mixing and outputting the IF-converted received signal; A mobile satellite broadcast receiving antenna for receiving the satellite broadcast signal for mobile, and performing IF conversion to a 2 GHz band and outputting the signal; and a second antenna for mixing the output signal from the antenna and the signal from the first mixing means. 2 mixing means, and the signal mixed by the second mixing means is transmitted by a single signal cable and drawn indoors, and connected to the drawn signal cable to transmit a 2 GHz band satellite reception signal for mobiles. And characterized in that it comprises a re-transmitting antenna for radiating a.
[0014]
According to this satellite signal retransmission system, in addition to the BS and CS signals, a satellite digital audio broadcast signal, which is a satellite broadcast for mobile units, is transmitted indoors using a single signal cable, and the satellite digital audio broadcast signal is transmitted indoors. Since it emits radio waves, it is possible to receive satellite digital audio broadcasts with mobile devices even indoors. Note that the indoor here includes a closed space such as an underground shopping mall in addition to an internal space such as a house.
Since the received signal frequency is different from the output and transmitted frequencies, the re-radiated radio wave does not adversely affect the receiving operation of the mobile-oriented satellite broadcast receiving antenna even if both radio waves are mixed. Further, at this time, the satellite digital audio broadcast signal is pulled in with one signal cable together with the BS and CS signals, so that it is not necessary to newly insert a signal cable for the satellite digital audio broadcast signal, and therefore, it can be easily implemented.
[0015]
The satellite signal retransmission system according to the invention of claim 8 has a right polarization signal receiving section and a left polarization signal receiving section for receiving the BS and CS signals, and converts the received right polarization signal to approximately 10.678 GHz. An antenna unit that performs IF conversion at a local frequency and performs IF conversion on a received left-polarized signal at a local frequency of approximately 9.576 GHz; a first mixing unit that mixes and outputs the received signal subjected to IF conversion; And a second mixing means for mixing the output signal from the antenna and the signal from the first mixing means, for receiving the satellite signal for mobile object and outputting the signal without IF conversion. Means, and a retransmitting antenna for transmitting the signal mixed by the second mixing means through a single signal cable, drawing the signal indoors, connecting to the drawn signal cable, and reradiating at a received frequency. Wherein the Ete made.
[0016]
According to this satellite signal retransmission system, in addition to BS and CS signals, a satellite digital audio broadcast, which is a satellite broadcast signal for mobile units, is transmitted indoors via a single signal cable, and a satellite digital audio broadcast signal radio wave is transmitted indoors. , So satellite digital audio broadcasts can be received by mobile devices even indoors.
Then, since the received satellite digital audio broadcast signal is transmitted and transmitted without IF conversion, a converter circuit is not required and a simple circuit configuration can be made, so that a system can be configured at low cost and re-radiated radio waves leak to the outside. It can be suitably applied to an area where there is no problem. At this time, since the satellite digital audio broadcast signal is pulled in with one signal cable together with the BS and CS signals, there is no need to newly insert a signal cable for the satellite digital audio broadcast signal, and the system can be easily implemented. is there.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a satellite signal receiving system and a satellite signal retransmitting system according to the present invention, wherein reference numeral 1 denotes a satellite signal reception for receiving a BS signal from a first satellite and a CS signal from a second satellite. An antenna, 2 a mobile satellite broadcast receiving antenna for receiving a satellite digital audio broadcast signal which is a mobile satellite broadcast signal, 3 and 4 boosters, 5 a filter circuit, 6 a mixer as second mixing means, Reference numeral 7 denotes a branching device, 8 denotes a retransmitting antenna for re-radiating a received signal, and 17 denotes an interior such as a dwelling unit or an underground mall.
[0018]
As shown in the block diagram of FIG. 2, the satellite signal receiving antenna 1 includes a pair of receiving probes 10, a converter unit 11, and a mixing unit 12 as a first mixing unit. It comprises a first probe 10a for receiving and a second probe 10b for receiving right polarized wave. The converter section 11 has a first local oscillator section 11a and a second local oscillator section 11b, and the signal received by the first probe 10a and the signal received by the second probe 10b are IF signals at independent local frequencies. Is converted. Reference numeral 13 denotes an amplifier circuit.
The mixing section 12 is provided with a high-pass filter 12a on the first probe 10a side and a low-pass filter 12b on the second probe 10b side for mixing.
[0019]
The left polarized signal received by the first probe 10a is IF-converted at the local frequency of 9.57638 GHz of the first local oscillator 11a, and the right polarized signal received by the second probe 10b is transmitted to the second local oscillator 11b. IF conversion is performed at a local frequency of 10.678 GHz. Thus, the BS and CS signals received in the frequency spectrum shown in FIG. 3A are IF-converted into the frequency band shown in FIG. 3B, output to a signal cable 9a which is one coaxial cable, and transmitted. You.
Then, the satellite digital audio broadcast signal received by the mobile object satellite broadcast receiving antenna 2 is amplified and output by the booster 4 without being frequency-converted, and is mixed with the BS and CS signals. The signal is drawn indoors by one signal cable 9b with the frequency spectrum shown in FIG.
[0020]
As shown in the frequency spectrum of FIG. 3C, since the satellite digital audio broadcast signal has a relatively narrow band of 2.63 to 2.655 GHz, this frequency is the high-end frequency 2.611 GHz of the BS left polarization signal. It can be arranged in a guard band between the low-end frequency of the CS left-polarized signal of 2.673 GHz, and even if it has a BS left-polarized signal at the receiving frequency, it affects the BS and CS signals with one signal cable. It is possible to mix and transmit satellite digital audio broadcast signals without transmission.
[0021]
The retransmission antenna 8 is connected indoors to a signal cable 9b via a splitter 7 via two bandpass filters 8a and 8b and a signal amplifier 8c. The two band-pass filters 8a and 8b are configured to pass signals in the frequency band of 2.63 GHz to 2.665 GHz, and the signal amplifier 8c amplifies the signal in the frequency band. In this way, the retransmission antenna 8 is re-radiated at a frequency between 2.63 GHz and 2.665 GHz, which is the same frequency as the satellite digital audio broadcast frequency transmitted from the satellite. Note that the signal amplifier 8c can be eliminated depending on the state of the signal transmitted through the signal cable 9b.
[0022]
As described above, since the above-mentioned satellite signal receiving antenna performs IF conversion on the received left-polarized signal above the right-polarized signal on the frequency axis, it is separated even if there is a frequency band overlapping the left-right polarized wave of the satellite signal. Therefore, it is possible to transmit all received signals with one signal cable. Therefore, when the signals from the first satellite and the second satellite are BS and CS signals, there is no common frequency band even if the reception frequency has a BS left polarization signal, and all signals are transmitted with one signal cable. The receiving signal can be transmitted.
At this time, the left-polarized signal is IF-converted at 9.57638 GHz, and the right-polarized signal is IF-converted at 10.678 GHz. Therefore, even if the received signal has a BS left-polarized signal, it is 2.63. It is possible to mix and transmit satellite digital audio broadcast signals of up to 2.655 GHz.
[0023]
Therefore, the satellite digital audio broadcast signal can be pulled in indoors without having to pull in a new signal cable, and the satellite digital audio broadcast signal is re-radiated. Can receive audio broadcasts. It is needless to say that if a mobile device is directly connected to the pulled-in signal cable, satellite digital audio broadcasting can be received without providing a retransmission antenna. In addition, since the received signal is transmitted and transmitted without frequency conversion, a converter circuit is not required and a satellite signal retransmission system can be easily configured. It is suitable for an area such as an underground shopping mall where re-radiated radio waves do not leak.
[0024]
FIG. 4 shows a block diagram of a converter 14 in which the converter 11 and the mixer 12 of the satellite signal receiving antenna 1 are integrated. As shown in FIG. 4, two signal input sections 15a and 15b and one signal output section 16 are provided, and the mixing section 12 is built in the converter 14, and the same components as those in FIG. The reference numerals are attached.
As described above, the converter section may be formed independently from the antenna body having the receiving probe. One of the signal input sections receives the BS right polarization signal and the CS right polarization signal, and the other signal input section receives the BS right polarization signal and the CS right polarization signal. If a BS left polarization signal and a CS left polarization signal are input, IF is used at a higher frequency in the order of BS right polarization signal, CS right polarization signal, BS left polarization signal, CS left polarization signal on the frequency axis. The signal can be converted, mixed, and transmitted on a single signal cable, and the frequency band of the satellite digital audio broadcast can be adjusted within the guard band between the IF-converted BS left polarization signal and CS left polarization signal. Therefore, satellite digital audio broadcast signals can be mixed together and transmitted through a single signal cable.
[0025]
Although the above-mentioned converter incorporates the mixing circuit 12, the mixing circuit 12 may be formed separately. In this case, two signal output units of the converter may be provided similarly to the input unit.
Although the embodiment of FIG. 1 described a system that receives satellite signals of both BS and CS with one antenna, it is a system that receives BS and CS with separate antennas and transmits them with one signal cable. Even so, by using the converter, the frequency bands of the left-polarized signal and the right-polarized signal can be separated so that they do not overlap, and output with one signal cable. Can be mixed and transmitted without frequency conversion.
[0026]
FIG. 5 shows another embodiment of the satellite signal receiving system and the satellite signal retransmitting system, and shows a mobile-oriented satellite broadcast receiving apparatus which is a main part thereof. In FIG. 5, reference numeral 20 denotes a mobile satellite broadcast receiving antenna, and reference numeral 21 denotes a signal processor. The output of the signal processor 21 is connected to the mixer 6 shown in FIG. 1, and is mixed with BC and CS reception signals. The configurations of the satellite signal receiving antenna for receiving the BS and CS signals and the indoor re-radiating antenna are the same as in FIG. 1 and are omitted.
[0027]
The mobile satellite broadcast receiving antenna 20 of FIG. 5 is different from the mobile satellite broadcast receiving antenna 2 of FIG. 1 and is configured to receive a signal in the 12 GHz band transmitted to the gap filler. The frequency is converted to a frequency of 2.655 GHz and output. A well-known CS receiving antenna that similarly receives a CS signal radiated in the 12 GHz band can be used as it is as the mobile object satellite broadcast receiving antenna 20. Here, an example in which the CS receiving antenna is used is shown. Therefore, the signal is IF-converted by a built-in converter circuit and output in a frequency band of 1.0 to 1.55 GHz.
The signal processor 21 includes a tuner 22, a TDM demodulator 23, a CDM modulator 24, and an output amplifier 25. The signal processor 21 converts the signal to a frequency of 2.63 to 2.655 GHz and outputs the converted signal.
[0028]
As described above, since the frequency of the received signal is different from the frequency of transmission and re-radiation, even when used in an environment such as a general residence where radio waves from satellites and re-radiated radio waves are mixed, the re-radiated radio waves are directed toward mobile objects. Retransmission can be performed satisfactorily without adversely affecting the receiving operation of the satellite broadcast receiving antenna, and the mobile device can be used indoors.
Further, at this time, the satellite digital audio broadcast signal is pulled in with one signal cable together with the BS and CS signals, so that it is not necessary to newly insert a signal cable for the satellite digital audio broadcast signal, and therefore, it can be easily implemented.
[0029]
In the above embodiment, the local frequency for IF conversion of the left polarization received from the first and second satellites (BS and CS) is 10.678 GHz, and the local frequency for IF conversion of the right polarization is 9.576 GHz. The mobile-targeted satellite broadcast signal, which is a narrow band signal, can be transmitted together. However, if the signal can be arranged in the left and right polarization guard bands, the mobile-targeted satellite can be selected by appropriately selecting the local frequency. Even if it is not a broadcast signal, it can be transmitted by one signal cable in accordance with the BS and CS reception signals.
In addition, the use of a CS receiving antenna as a satellite broadcasting receiving antenna for a mobile object allows the use of a mass-produced inexpensive antenna, so that even a system having a converter does not increase the cost. A dedicated antenna for directly converting the frequency from the band to 2,63 to 2.655 GHz may be used.
Further, in the above embodiment, the local frequency of the first local oscillator is 9.57638 GHz, and the local frequency of the second local oscillator is 10.678 GHz. However, as described above, this frequency is the intermediate frequency of the satellite digital audio broadcast signal. A frequency that places the frequency in the center of the guard band. If the satellite digital audio broadcast signal is placed in the guard band between the BS left polarization and the CS left polarization, both signals are mixed and transmitted. The local frequencies of the first and second local oscillators may be frequencies near the above numerical values.
[0030]
【The invention's effect】
As described above in detail, according to the satellite signal receiving antenna of the present invention, since the received left-polarized signal is IF-converted to a higher frequency than the received right-polarized signal, there is no common frequency band, and one All received signals can be transmitted by the signal cable. Therefore, when the signals from the first and second satellites are BS and CS signals, even if the received polarization includes the BS left-polarized signal, all the received signals are transmitted using one signal cable. it can.
Also, by setting the local frequency for IF conversion of right-polarized wave to 10.678 GHz and the local frequency for IF conversion of left-polarized wave to 9.576 GHz, satellite digital audio broadcasting having a frequency band of 2.63 to 2.655 GHz. Is arranged in the guard band between the BS left polarization frequency band and the CS left polarization frequency band, and mixes satellite digital audio broadcast signals without affecting the BS and CS signals with one signal cable. Can be transmitted.
Therefore, even if the BS left-polarized signal is pulled indoors with one signal cable in addition to the BS right-polarized signal and CS left-right polarized signal, the satellite digital audio broadcast signal is further mixed into the signal cable. Therefore, it is possible to receive a satellite digital audio broadcast signal indoors without newly introducing a signal cable.
[0031]
Further, according to the converter of the present invention, when the BS and CS signals are received, the higher frequency in the order of BS right polarization signal, CS right polarization signal, BS left polarization signal, CS left polarization signal on the frequency axis. Since the signal is IF-converted into a band, it is possible to mix the BS and CS signals and transmit the mixed signal using a single signal cable. Furthermore, since the satellite digital audio broadcast signal transmitted in the frequency band of 2.63 to 2.655 GHz can be arranged in the guard band between the IF-converted BS right polarization signal and the CS right polarization signal, the satellite digital audio Broadcast signals can also be mixed and transmitted over a single signal cable.
[0032]
Further, according to the satellite signal receiving system of the present invention, in addition to the left and right polarized BS and CS signals, the satellite digital audio broadcast signal can be brought into the room indoors with a single signal cable. Alternatively, when newly receiving a satellite digital audio broadcast signal, there is no need to pull in a signal cable, and the signal can be easily received indoors.
[0033]
Further, according to the satellite signal retransmission system of the present invention, a satellite digital audio broadcast signal is transmitted indoors by one signal cable in addition to the BS and CS signals, and a satellite digital audio broadcast signal radio wave is radiated indoors. Therefore, it is possible to receive satellite digital audio broadcasts using mobile devices even indoors. Also, at this time, the satellite broadcast signal for the mobile unit is pulled in with one signal cable together with the BS and CS signals. Therefore, it is not necessary to newly connect a signal cable for receiving the satellite broadcast signal for the mobile unit, and the system can be simplified. Can be implemented.
In particular, if the received signal frequency is different from the output and transmitted frequencies, the re-radiated radio waves may adversely affect the receiving operation of the mobile-oriented satellite broadcast receiving antenna even in an environment where both radio waves are mixed. Nor.
[Brief description of the drawings]
FIG. 1 is a block diagram of a satellite signal receiving system and a satellite signal retransmission system showing an example of an embodiment of the present invention.
FIG. 2 is a block diagram of the satellite signal receiving antenna shown in FIG.
3A and 3B show changes in a received signal, wherein FIG. 3A shows a received frequency spectrum of BS and CS signals, and FIG. 3B shows a frequency spectrum obtained by IF-converting the BS and CS signals. (C) is a frequency spectrum obtained by adding a satellite digital audio broadcast signal to the IF-converted BS and CS signals.
FIG. 4 is a block diagram showing an example of a converter according to the present invention.
FIG. 5 is a block diagram showing another example of the satellite signal receiving system and the satellite signal retransmitting system according to the present invention, which is a main part of a satellite broadcasting receiving antenna for a mobile object.
FIG. 6 is a frequency spectrum showing an example of an IF-converted output signal of a conventional satellite signal receiving antenna.
[Explanation of symbols]
1. Satellite signal reception antenna, 2. Satellite reception antenna for mobile object, 6. Mixer as second mixing means, 8. Retransmission antenna, 9a, 9b signal cable, 10 probe A first probe, 10b second probe, 11 converter unit, 11a first local oscillator unit, 11b second local oscillator unit, 12 mixing unit as first mixing means .., 15a, 15b... Signal input section, 16... Signal output section, 17... Indoor, 20... Mobile object satellite broadcast receiving antenna, 24... CDM modulator.

Claims

A right-polarized signal receiver and a left-polarized signal receiver for receiving signals from the first and second satellites that output at least one of the right and left polarized signals, and the received right-polarized signal is received A satellite signal receiving antenna, wherein both reception signals are IF-converted and output so as to be arranged at a higher frequency than the left polarization signal.

The signals from the first and second satellites are a BS signal and a CS signal. The received right-polarized signal is IF-converted at a local frequency of approximately 10.678 GHz, and the received left-polarized signal is converted to approximately 9.576 GHz. 2. The satellite signal receiving antenna according to claim 1, wherein IF conversion is performed at a local frequency.

3. The satellite signal receiving antenna according to claim 1, further comprising mixing means for mixing the IF-converted right-polarized signal and the IF-converted left-polarized signal, and outputting the received signal via one signal cable.

It has two signal input sections and two signal output sections, and performs IF conversion on a signal input to one signal input section at a local frequency of about 10.678 GHz, and converts a signal input to the other signal input section. A converter that performs IF conversion at a local frequency of about 9.576 GHz.

It has a right-polarized signal receiving unit and a left-polarized signal receiving unit for receiving BS and CS signals, performs IF conversion on the received right-polarized signal at a local frequency of about 10.678 GHz, and receives the left-polarized signal. , An antenna unit that performs IF conversion at a local frequency of approximately 9.576 GHz, a first mixing unit that mixes and outputs the IF-converted reception signal, and receives a mobile-targeted satellite broadcast signal in the 2 GHz band or 12 GHz band. A mobile satellite broadcast receiving antenna that outputs at the same frequency as the mobile satellite broadcasting in the 2 GHz band; and a second mixing unit that mixes an output signal of the antenna and a signal from the first mixing unit. A satellite signal receiving system comprising:

The mobile satellite broadcast signal received by the mobile satellite broadcast receiving antenna is a 2 GHz band signal, and the mobile satellite broadcast receiving antenna outputs a reception signal to the second mixing unit without performing IF conversion. 6. The satellite signal receiving system according to 5.

It has a right-polarized signal receiving unit and a left-polarized signal receiving unit for receiving BS and CS signals, performs IF conversion on the received right-polarized signal at a local frequency of about 10.678 GHz, and receives the left-polarized signal. , An antenna unit for performing IF conversion at a local frequency of approximately 9.576 GHz, first mixing means for mixing and outputting the received signal subjected to IF conversion, and receiving a mobile-targeted satellite broadcast signal in the 12 GHz band and transmitting the signal in the 2 GHz band. A mobile satellite broadcast receiving antenna for performing IF conversion on the signal, and a second mixing means for mixing an output signal from the antenna with a signal from the first mixing means; and a signal mixed by the second mixing means A retransmission antenna that transmits the signal through a single signal cable, pulls the signal indoors, connects to the pulled signal cable, and re-radiates a satellite reception signal for mobiles in the 2 GHz band. Re-transmission system.

It has a right-polarized signal receiving unit and a left-polarized signal receiving unit for receiving BS and CS signals, performs IF conversion on the received right-polarized signal at a local frequency of about 10.678 GHz, and receives the left-polarized signal. , An IF unit for performing IF conversion at a local frequency of approximately 9.576 GHz, first mixing means for mixing and outputting the received signal subjected to IF conversion, and receiving a 2 GHz band mobile-oriented satellite broadcast signal and performing IF conversion. A mobile satellite broadcast receiving antenna that outputs the signal without using the antenna, a second mixing unit that mixes an output signal from the antenna with a signal from the first mixing unit, and a signal mixed by the second mixing unit. A satellite signal retransmission system, comprising: a retransmission antenna that transmits the signal signal through a book cable, pulls it indoors, connects to the pulled signal cable, and re-radiates at a received frequency.