JPH0661900A - Mobile body satellite communication system - Google Patents
Mobile body satellite communication systemInfo
- Publication number
- JPH0661900A JPH0661900A JP4100080A JP10008092A JPH0661900A JP H0661900 A JPH0661900 A JP H0661900A JP 4100080 A JP4100080 A JP 4100080A JP 10008092 A JP10008092 A JP 10008092A JP H0661900 A JPH0661900 A JP H0661900A
- Authority
- JP
- Japan
- Prior art keywords
- satellite
- station
- mobile
- mobile station
- building
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は移動体衛星通信システム
に関し、特に市街地において衛星から移動体への電波が
建物にさえぎられた場合に、通信回線を確保できる移動
体衛星通信システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile satellite communication system, and more particularly to a mobile satellite communication system capable of securing a communication line when a building is shielded from radio waves from a satellite in a city area.
【０００２】[0002]
【従来の技術】従来、公衆通信網と移動局との間を衛星
を経由して通信回線を構成する移動体衛星通信システム
では、図３に示すように、衛星地球局である固定局１、
衛星２、移動局３Ａから構成されており、固定局１は公
衆網８に接続されている。固定局１から送受信された電
波は衛星２を介して移動局３Ａで受信され、逆に移動局
３Ａで送受信された電波は、衛星２を介して、固定局１
で受信される。この衛星通信回線を利用して移動局３と
公衆網８との通信を可能にしていた。ここで市街地の建
築物４がある所へ移動した場合には、例えば移動先の移
動局３Ｂのように建築物４により衛星２との電波の授受
がさえぎられ、交信が一時的に断となる事があった。2. Description of the Related Art Conventionally, in a mobile satellite communication system in which a communication line is formed between a public communication network and a mobile station via a satellite, as shown in FIG.
It is composed of a satellite 2 and a mobile station 3A, and the fixed station 1 is connected to a public network 8. Radio waves transmitted and received from the fixed station 1 are received by the mobile station 3A via the satellite 2, and conversely radio waves transmitted and received by the mobile station 3A are transmitted via the satellite 2 to the fixed station 1
Will be received at. Communication between the mobile station 3 and the public network 8 is enabled using this satellite communication line. If the building 4 in the city area moves to a place where the building 4 is located, the building 4 interrupts the transmission and reception of radio waves with the satellite 2 like the mobile station 3B at the moving destination, and the communication is temporarily interrupted. There was a thing.
【０００３】[0003]
【発明が解決しようとする課題】この従来の移動体衛星
通信システムでは、市街地においては建築物にさえぎら
れて衛星と移動局との間で電波が伝わらない状態が発生
する確率が高いので、特に高層建築の多い過密市街地に
おいて移動体衛星通信システムのサービスエリアが相当
に制約される欠点があった。In this conventional mobile satellite communication system, there is a high probability that radio waves will not be transmitted between the satellite and the mobile station due to the building being blocked by the buildings in the urban area. There is a drawback in that the service area of the mobile satellite communication system is considerably restricted in an overcrowded urban area with many high-rise buildings.
【０００４】[0004]
【課題を解決するための手段】本発明の移動体衛星通信
システムは、衛星と、公衆網と接続され前記衛星を介し
て移動局と通信を行なう固定局と、前記衛星からの電波
が市街地の建築物により電波遮へいされるおそれのある
位置に移動した前記移動局とを有する移動体衛星通信シ
ステムにおいて、前記建築物の上に衛星と移動局との間
の電波を中継するための中継局を備え、前記移動局が衛
星からの電波の建築物により遮へいされる状態において
前記中継局と送受信する。A mobile satellite communication system according to the present invention is a satellite, a fixed station connected to a public network and communicating with a mobile station via the satellite, and radio waves from the satellite are transmitted in a city area. In a mobile satellite communication system having the mobile station moved to a position where radio waves may be shielded by a building, a relay station for relaying radio waves between the satellite and the mobile station is provided on the building. The mobile station transmits / receives to / from the relay station in a state where the mobile station is shielded by a building of radio waves from a satellite.
【０００５】[0005]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の第１の実施例のシステム構成図であ
る。図１において図３と同一の符号は同一の機能を有す
る。図１の実施例で固定局１から発せられた電波は衛星
を２を介して移動局３に送られるが、建築物４にさえぎ
られるために、直接受信できない。ここで市街地の高い
建築物の上にあらかじめ中継局５を設置しておくことに
よって、衛星２からの電波が中継局５を介して移動局３
に伝送される。同様にして、移動局３からの電波は中継
局５を中継し、衛星２を介して固定局１へ伝送される。
このようにして移動局３と公衆網８との通信が確保され
る。中継局５は、衛星との電波をさえぎる恐れのある高
い建築物にのみ設置しておけばよく、広い範囲をカバー
する必要性もないため、小規模な中継局でよい。The present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of a first embodiment of the present invention. 1, the same reference numerals as those in FIG. 3 have the same functions. The radio wave emitted from the fixed station 1 in the embodiment of FIG. 1 is sent to the mobile station 3 via the satellite 2 but cannot be directly received because it is blocked by the building 4. By installing the relay station 5 on a building in a high city area in advance, the radio wave from the satellite 2 is transmitted to the mobile station 3 via the relay station 5.
Be transmitted to. Similarly, the radio wave from the mobile station 3 is relayed by the relay station 5 and transmitted to the fixed station 1 via the satellite 2.
In this way, communication between the mobile station 3 and the public network 8 is secured. The relay station 5 may be a small-scale relay station because it may be installed only in a high building where there is a risk of blocking radio waves from the satellite, and there is no need to cover a wide range.
【０００６】次に本発明の第２の実施例を図２により説
明する。図２において図３と同一の符号は同一の機能を
有する。すなわち、第２の実施例では衛星と直接通信の
できない市街地にはあらかじめ地上基地局６を設けてお
く。衛星２との交信不能な地域がわかっている場合に
は、初めから地上基地局６との交信に切り換えて、移動
局３と公衆網９との通信を確保する。また、移動局３が
衛星と交信中に地上基地局６との交信に切り換える場合
には、地上基地局６と固定局１との間の地上通信回線７
を介して固定局１に通信信号を転送して公衆網８との通
信を確保する。Next, a second embodiment of the present invention will be described with reference to FIG. 2, the same reference numerals as those in FIG. 3 have the same functions. That is, in the second embodiment, the ground base station 6 is provided in advance in an urban area where direct communication with the satellite is not possible. When the area where communication with the satellite 2 is impossible is known, communication with the terrestrial base station 6 is switched from the beginning to ensure communication between the mobile station 3 and the public network 9. When the mobile station 3 switches to communication with the terrestrial base station 6 while communicating with the satellite, the terrestrial communication line 7 between the terrestrial base station 6 and the fixed station 1 is used.
A communication signal is transferred to the fixed station 1 via the network to secure communication with the public network 8.
【０００７】[0007]
【発明の効果】以上説明したように本発明は、市街地の
高い建築物の上に中継局を設置するか、あらかじめ衛星
との交信不可能な地域に地上基地局を設置することによ
り、建築物によって衛星と移動局との間の電波がさえぎ
られた場合でも、移動体通信システムを構成できるとい
う効果を有する。As described above, according to the present invention, a relay station is installed on a high building in an urban area, or a ground base station is installed in an area where communication with a satellite is not possible in advance. Even if the radio wave between the satellite and the mobile station is blocked by the, the mobile communication system can be configured.
【図１】本発明の第１の実施例を示すシステム構成図で
ある。FIG. 1 is a system configuration diagram showing a first embodiment of the present invention.
【図２】本発明の第２の実施例を示すシステム構成図で
ある。FIG. 2 is a system configuration diagram showing a second embodiment of the present invention.
【図３】従来の移動体衛星通信システムを示すシステム
構成図である。FIG. 3 is a system configuration diagram showing a conventional mobile satellite communication system.
１ 固定局 ２ 衛星 ３ 移動局 ４ 建築物 ５ 中継局 ６ 地上基地局 ７ 地上通信回線 ８，９ 公衆網 1 Fixed Station 2 Satellite 3 Mobile Station 4 Building 5 Relay Station 6 Terrestrial Base Station 7 Terrestrial Communication Line 8, 9 Public Network
Claims (2)
して移動局と通信を行なう固定局と、前記衛星からの電
波が市街地の建築物により電波遮へいされるおそれのあ
る位置に移動した前記移動局とを有する移動体衛星通信
システムにおいて、前記建築物の上に衛星と移動局との
間の電波を中継するための中継局を備え、前記移動局が
衛星からの電波の建築物により遮へいされる状態におい
て前記中継局と送受信することを特徴とする移動体衛星
通信システム。1. A satellite, a fixed station that is connected to a public network and communicates with a mobile station via the satellite, and has moved to a position where radio waves from the satellite may be blocked by a building in an urban area. In a mobile satellite communication system having the mobile station, a relay station for relaying radio waves between the satellite and the mobile station is provided on the building, and the mobile station is a building of radio waves from the satellite. A mobile satellite communication system which transmits and receives to and from the relay station in a shielded state.
介して移動局と通信を行なう固定局と、前記衛星からの
電波が市街地の建築物により電波遮へいされるおそれの
ある位置に移動した移動局とを有する移動体衛星通信シ
ステムにおいて、前記公衆網と接続されかつ前記固定局
とも地上通信回線を有し前記市街地の建築物により電波
遮へいされるおそれのある位置を選択してあらかじめ移
動局との地上電波による交信を行う地上固定局を備え、
前記移動局が衛星からの電波の建築物により遮へいされ
る状態において前記地上固定局と送受信することを特徴
とする移動体衛星通信システム。2. A satellite, a fixed station that communicates with a mobile station via the satellite connected to the public network, and a position where radio waves from the satellite may be blocked by a building in an urban area. In the mobile satellite communication system including the mobile station, the mobile station is moved in advance by selecting a position that is connected to the public network and has a ground communication line with the fixed station and may be shielded by a building in the city area. Equipped with a ground fixed station that communicates with the station by ground wave,
A mobile satellite communication system, wherein the mobile station transmits and receives to and from the ground fixed station in a state where the mobile station is shielded by a radio wave from a satellite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4100080A JPH0661900A (en) | 1992-04-21 | 1992-04-21 | Mobile body satellite communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4100080A JPH0661900A (en) | 1992-04-21 | 1992-04-21 | Mobile body satellite communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0661900A true JPH0661900A (en) | 1994-03-04 |
Family
ID=14264469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4100080A Pending JPH0661900A (en) | 1992-04-21 | 1992-04-21 | Mobile body satellite communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0661900A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0724339A2 (en) * | 1995-01-27 | 1996-07-31 | NEC Corporation | Mobile satellite communication terminal |
| US5689803A (en) * | 1995-08-25 | 1997-11-18 | Motorola, Inc. | Dial-back call completion method and apparatus in a radio-communication system |
| US5809418A (en) * | 1995-08-25 | 1998-09-15 | Motorola, Inc. | Position-dependent call connection method and apparatus in a radio-communication system |
| US6751442B1 (en) * | 1997-09-17 | 2004-06-15 | Aerosat Corp. | Low-height, low-cost, high-gain antenna and system for mobile platforms |
| US7251223B1 (en) | 2000-09-27 | 2007-07-31 | Aerosat Corporation | Low-height, low-cost, high-gain antenna and system for mobile platforms |
| US7403166B2 (en) | 2002-08-20 | 2008-07-22 | Aerosat Corporation | Communication system with broadband antenna |
| US7853197B2 (en) | 1996-10-11 | 2010-12-14 | Carmen Tawil | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
| US8427384B2 (en) | 2007-09-13 | 2013-04-23 | Aerosat Corporation | Communication system with broadband antenna |
| US10992052B2 (en) | 2017-08-28 | 2021-04-27 | Astronics Aerosat Corporation | Dielectric lens for antenna system |
| US11929552B2 (en) | 2016-07-21 | 2024-03-12 | Astronics Aerosat Corporation | Multi-channel communications antenna |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221530A (en) * | 1982-06-17 | 1983-12-23 | Nec Corp | Tunnel zone channel switching system |
| JPS6037843A (en) * | 1983-08-10 | 1985-02-27 | Hitachi Ltd | Communication system of mobile body over wide area |
| JPS62104327A (en) * | 1985-10-31 | 1987-05-14 | Nec Corp | Tunnel radio communication system |
| JPH02171037A (en) * | 1988-12-24 | 1990-07-02 | Mitsubishi Electric Corp | Satellite communication system in tunnel |
| JPH03291582A (en) * | 1990-04-09 | 1991-12-20 | Pioneer Electron Corp | Gps signal repeating device |
-
1992
- 1992-04-21 JP JP4100080A patent/JPH0661900A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58221530A (en) * | 1982-06-17 | 1983-12-23 | Nec Corp | Tunnel zone channel switching system |
| JPS6037843A (en) * | 1983-08-10 | 1985-02-27 | Hitachi Ltd | Communication system of mobile body over wide area |
| JPS62104327A (en) * | 1985-10-31 | 1987-05-14 | Nec Corp | Tunnel radio communication system |
| JPH02171037A (en) * | 1988-12-24 | 1990-07-02 | Mitsubishi Electric Corp | Satellite communication system in tunnel |
| JPH03291582A (en) * | 1990-04-09 | 1991-12-20 | Pioneer Electron Corp | Gps signal repeating device |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0724339A2 (en) * | 1995-01-27 | 1996-07-31 | NEC Corporation | Mobile satellite communication terminal |
| EP0724339A3 (en) * | 1995-01-27 | 1999-06-02 | NEC Corporation | Mobile satellite communication terminal |
| US5689803A (en) * | 1995-08-25 | 1997-11-18 | Motorola, Inc. | Dial-back call completion method and apparatus in a radio-communication system |
| US5809418A (en) * | 1995-08-25 | 1998-09-15 | Motorola, Inc. | Position-dependent call connection method and apparatus in a radio-communication system |
| US7853197B2 (en) | 1996-10-11 | 2010-12-14 | Carmen Tawil | Apparatus and method for reusing satellite broadcast spectrum for terrestrially broadcast signals |
| US6751442B1 (en) * | 1997-09-17 | 2004-06-15 | Aerosat Corp. | Low-height, low-cost, high-gain antenna and system for mobile platforms |
| US7181160B2 (en) | 1997-09-17 | 2007-02-20 | Aerosat Corporation | Method and apparatus for providing a signal to passengers of a passenger vehicle |
| US7251223B1 (en) | 2000-09-27 | 2007-07-31 | Aerosat Corporation | Low-height, low-cost, high-gain antenna and system for mobile platforms |
| US7791549B2 (en) | 2002-08-20 | 2010-09-07 | Aerosat Corporation | Communication system with broadband antenna |
| US7403166B2 (en) | 2002-08-20 | 2008-07-22 | Aerosat Corporation | Communication system with broadband antenna |
| US8760354B2 (en) | 2002-08-20 | 2014-06-24 | Astronics Aerosat Corporation | Communication system with broadband antenna |
| US9293835B2 (en) | 2002-08-20 | 2016-03-22 | Astronics Aerosat Corporation | Communication system with broadband antenna |
| US8427384B2 (en) | 2007-09-13 | 2013-04-23 | Aerosat Corporation | Communication system with broadband antenna |
| US9774097B2 (en) | 2007-09-13 | 2017-09-26 | Astronics Aerosat Corporation | Communication system with broadband antenna |
| US11929552B2 (en) | 2016-07-21 | 2024-03-12 | Astronics Aerosat Corporation | Multi-channel communications antenna |
| US10992052B2 (en) | 2017-08-28 | 2021-04-27 | Astronics Aerosat Corporation | Dielectric lens for antenna system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980811 |