JP3153496B2 - 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法 - Google Patents

天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法

Info

Publication number
JP3153496B2
JP3153496B2 JP16429697A JP16429697A JP3153496B2 JP 3153496 B2 JP3153496 B2 JP 3153496B2 JP 16429697 A JP16429697 A JP 16429697A JP 16429697 A JP16429697 A JP 16429697A JP 3153496 B2 JP3153496 B2 JP 3153496B2
Authority
JP
Japan
Prior art keywords
degrees
satellite
orbit
satellites
orbital
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.)
Expired - Fee Related
Application number
JP16429697A
Other languages
English (en)
Japanese (ja)
Other versions
JPH1134996A (ja
Inventor
利秀 前田
亘男 浜野
繁樹 中村
富治 吉田
政孝 大和田
雅彦 池田
隆 薮谷
将弘 伊藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16429697A priority Critical patent/JP3153496B2/ja
Priority to US09/081,551 priority patent/US6352222B1/en
Priority to EP98304000A priority patent/EP0880240A3/en
Publication of JPH1134996A publication Critical patent/JPH1134996A/ja
Priority to US09/471,503 priority patent/US6695259B1/en
Priority to US09/672,951 priority patent/US6764049B1/en
Priority to US09/672,061 priority patent/US6422516B1/en
Priority to US09/672,062 priority patent/US6328264B1/en
Application granted granted Critical
Publication of JP3153496B2 publication Critical patent/JP3153496B2/ja
Priority to US09/950,068 priority patent/US6499698B2/en
Priority to US10/006,128 priority patent/US6824107B2/en
Priority to US10/190,716 priority patent/US6634602B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00Cosmonautic vehicles
    • B64G1/10Artificial satellites; Systems of such satellites; Interplanetary vehicles
    • B64G1/1085Swarms and constellations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00Cosmonautic vehicles
    • B64G1/10Artificial satellites; Systems of such satellites; Interplanetary vehicles
    • B64G1/1007Communications satellites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64GCOSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00Cosmonautic vehicles
    • B64G1/22Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/24Guiding or controlling apparatus, e.g. for attitude control
    • B64G1/242Orbits and trajectories
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
JP16429697A 1997-05-21 1997-06-20 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法 Expired - Fee Related JP3153496B2 (ja)

Priority Applications (10)

Application Number Priority Date Filing Date Title
JP16429697A JP3153496B2 (ja) 1997-05-21 1997-06-20 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法
EP98304000A EP0880240A3 (en) 1997-05-21 1998-05-20 Satellite, satellite control method and satellite communication system
US09/081,551 US6352222B1 (en) 1997-05-21 1998-05-20 Satellite, satellite control method and satellite communication system
US09/471,503 US6695259B1 (en) 1997-05-21 1999-12-23 Communication system, communication receiving device and communication terminal in the system
US09/672,951 US6764049B1 (en) 1997-05-21 2000-09-29 Artificial satellite with an orbit having a long staying time in a zenith direction, an orbit control method and a communication system therewith
US09/672,061 US6422516B1 (en) 1997-05-21 2000-09-29 Artificial satellite with an orbit having a long staying time in a zenith direction, an orbit control method and a communication system therewith
US09/672,062 US6328264B1 (en) 1997-05-21 2000-09-29 Artificial satellite with an orbit having a long staying time in a zenith direction, an orbit control method and a communication system therewith
US09/950,068 US6499698B2 (en) 1997-05-21 2001-09-12 Satellite, satellite control method and satellite communication system
US10/006,128 US6824107B2 (en) 1997-05-21 2001-12-10 Artificial satellite with an orbit having a long staying time in a zenith direction, an orbit control method and a communication system therewith
US10/190,716 US6634602B2 (en) 1997-05-21 2002-07-09 Artificial satellite with an orbit having a long staying time in a zenith direction, an orbit control method and a communication system therewith

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9-131216 1997-05-21
JP13121697 1997-05-21
JP16429697A JP3153496B2 (ja) 1997-05-21 1997-06-20 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法

Related Child Applications (5)

Application Number Title Priority Date Filing Date
JP11180555A Division JP2000036787A (ja) 1997-05-21 1999-06-25 天頂方向での滞在時間が長い軌道の人工衛星とその軌道制御方法及びそれを用いた通信システム
JP18055499A Division JP3477114B2 (ja) 1997-05-21 1999-06-25 人工衛星群を用いた通信サービス提供方法および通信システム
JP18055699A Division JP2000036788A (ja) 1997-05-21 1999-06-25 天頂方向での滞在時間が長い軌道の人工衛星とその軌道制御方法及びそれを用いた通信システム
JP11206191A Division JP2000082985A (ja) 1997-05-21 1999-07-21 天頂方向での滞在時間が長い軌道の人工衛星とその軌道制御方法及びそれを用いた通信システム
JP2000121993A Division JP2001036448A (ja) 1997-05-21 2000-04-24 天頂方向での滞在時間が長い軌道の人工衛星とその軌道制御方法及びそれを用いた通信システム

Publications (2)

Publication Number Publication Date
JPH1134996A JPH1134996A (ja) 1999-02-09
JP3153496B2 true JP3153496B2 (ja) 2001-04-09

Family

ID=26466117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16429697A Expired - Fee Related JP3153496B2 (ja) 1997-05-21 1997-06-20 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法

Country Status (3)

Country Link
US (7) US6352222B1 (US06764049-20040720-C00002.png)
EP (1) EP0880240A3 (US06764049-20040720-C00002.png)
JP (1) JP3153496B2 (US06764049-20040720-C00002.png)

Families Citing this family (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3477115B2 (ja) 1999-03-16 2003-12-10 株式会社日立製作所 衛星を介して放送を行う方法、衛星放送システム、衛星放送基地局および衛星放送端末
JP3153496B2 (ja) * 1997-05-21 2001-04-09 株式会社日立製作所 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法
US6327523B2 (en) 1999-01-21 2001-12-04 Hughes Electronics Corporation Overhead system of inclined eccentric geosynchronous orbitting satellites
JP3867757B2 (ja) * 1999-03-31 2007-01-10 独立行政法人情報通信研究機構 データベースネットワークシステム
FR2793631B1 (fr) * 1999-05-10 2001-07-27 Centre Nat Etd Spatiales Terminal de communication bidirectionnel multmedia
JP3788111B2 (ja) * 1999-06-30 2006-06-21 株式会社デンソー 情報サービスシステム
US6772140B1 (en) * 1999-11-01 2004-08-03 Harris-Exigent, Inc. Hierarchical syntax for satellite command and control directives
US6442385B1 (en) * 1999-11-04 2002-08-27 Xm Satellite Radio, Inc. Method and apparatus for selectively operating satellites in tundra orbits to reduce receiver buffering requirements for time diversity signals
US6695260B2 (en) * 2000-02-03 2004-02-24 Virtual Geosatellite Llc Virtually geostationary satellite array
JP2001268026A (ja) 2000-03-17 2001-09-28 Hitachi Ltd 情報送受信方法及びその装置
US6829479B1 (en) 2000-07-14 2004-12-07 The Directv Group. Inc. Fixed wireless back haul for mobile communications using stratospheric platforms
US7369809B1 (en) * 2000-10-30 2008-05-06 The Directv Group, Inc. System and method for continuous broadcast service from non-geostationary orbits
US6714521B2 (en) * 2000-12-29 2004-03-30 Space Resources International Ltd. System and method for implementing a constellation of non-geostationary satellites that provides simplified satellite tracking
US6895243B2 (en) * 2000-12-29 2005-05-17 Bellsouth Intellectual Property Corporation Method for reverse path mapping in a wireless network using Comarco and Hughes telecommunications equipment
US6983142B2 (en) 2000-12-29 2006-01-03 Bellsouth Intellectual Property Corporation Method for reverse path mapping in a wireless network using Xtel and ericsson telecommunications equipment
US7995989B2 (en) * 2000-12-29 2011-08-09 Globalstar, Inc. Method and apparatus providing suppression of system access by use of confidence polygons, volumes and surfaces in a mobile satellite system
US6957064B2 (en) * 2000-12-29 2005-10-18 Bellsouth Intellectual Property Corporation Method for automated retune of telecommunications data in a wireless network using lucent equipment
US6987968B2 (en) * 2000-12-29 2006-01-17 Bellsouth Intellectual Property Corporation Method for reverse path mapping in a wireless network using Xtel and Lucent telecommunications equipment
US6895244B2 (en) * 2000-12-29 2005-05-17 Bellsouth Intellectual Property Corporation Method for automated update of telecommunications data in a wireless network
US6775540B2 (en) 2000-12-29 2004-08-10 Bellsouth Intellectual Property Corporation Method for automated retune of telecommunications data in a wireless network using ericsson equipment
US20020093673A1 (en) * 2001-01-16 2002-07-18 Safra Irving R. System and method for fulfilling information requests
JP4726306B2 (ja) * 2001-01-31 2011-07-20 パナソニック株式会社 無線通信システム、移動端末局及び方位決定方法
JP2003139841A (ja) * 2001-10-31 2003-05-14 Hitachi Ltd Gps内蔵携帯端末装置
US7277673B2 (en) * 2002-01-29 2007-10-02 Virtual Geosatellite Llc Virtually geostationary satellite array with optimized parameters
JP3863811B2 (ja) * 2002-06-07 2006-12-27 三菱電機株式会社 移動体通信装置
US20040059474A1 (en) 2002-09-20 2004-03-25 Boorman Daniel J. Apparatuses and methods for displaying autoflight information
US7233798B2 (en) * 2002-09-30 2007-06-19 Motorola, Inc. Method and apparatus for determining location of a remote unit using GPS
US7184744B1 (en) * 2002-10-10 2007-02-27 Itt Manufacturing Enterprises, Inc. GPS enabled emergency messaging system
JP2004157930A (ja) * 2002-11-08 2004-06-03 Toshiba Corp 救急医療支援システム及びこれで用いる救急車
WO2004107185A1 (en) 2003-05-27 2004-12-09 Macdonald, Dettwiler And Associates Ltd. Satellite communications system for providing global, high quality movement of very large data files
JP4488707B2 (ja) * 2003-09-26 2010-06-23 富士通株式会社 人工衛星の軌道制御計画方法、プログラム及び装置
US7188007B2 (en) 2003-12-24 2007-03-06 The Boeing Company Apparatuses and methods for displaying and receiving tactical and strategic flight guidance information
JP2005014909A (ja) * 2004-09-17 2005-01-20 Mitsubishi Electric Corp 衛星軌道システム
US7996034B1 (en) 2005-01-28 2011-08-09 National Semiconductor Corporation Cellular telephone handset with increased reception sensitivity and reduced transmit power levels
US7454272B1 (en) * 2005-08-25 2008-11-18 Raytheon Company Geostationary stationkeeping method
US7107007B1 (en) * 2005-10-14 2006-09-12 Korea Aerospace Research Institute Positioning system for a geostationary satellite
US7642960B2 (en) * 2005-12-28 2010-01-05 The Directv Group, Inc. Command, control and communications with intelligent antennas
JP4855103B2 (ja) * 2006-03-03 2012-01-18 三菱スペース・ソフトウエア株式会社 軌道生成装置、軌道生成方法および軌道生成プログラム
US8676501B2 (en) * 2006-12-22 2014-03-18 The Boeing Company Satellite navigation using long-term navigation information
US8099186B2 (en) * 2006-12-22 2012-01-17 The Boeing Company Satellite navigation using long-term navigation information and autonomous orbit control
JP2009227019A (ja) * 2008-03-21 2009-10-08 Fujitsu Ltd 準天頂衛星の制御計画生成プログラム、方法及び装置
US8180562B2 (en) 2008-06-04 2012-05-15 The Boeing Company System and method for taxi route entry parsing
US8238903B2 (en) * 2009-02-19 2012-08-07 Korb C Laurence Methods for optimizing the performance, cost and constellation design of satellites for full and partial earth coverage
JP2010273145A (ja) * 2009-05-21 2010-12-02 Fujitsu Component Ltd 遠隔ユニット
CN101850851B (zh) * 2010-05-26 2015-02-04 中国科学院空间科学与应用研究中心 Sport时钟扫描卫星的布局结构
CA2716174C (en) * 2010-10-01 2019-11-26 Telesat Canada Satellite system
CN102267575B (zh) * 2011-04-29 2013-09-11 航天东方红卫星有限公司 敏捷卫星成像沿任意方向推扫速度失配时的姿态补偿方法
CN102267574B (zh) * 2011-04-29 2013-05-01 航天东方红卫星有限公司 敏捷卫星成像侧摆推扫速度失配时的姿态补偿方法
CN102431659B (zh) * 2011-10-27 2013-07-24 北京航空航天大学 一种日地系统Halo轨道探测器的构型及其姿态指向
US8922654B2 (en) * 2012-03-22 2014-12-30 Exelis, Inc. Algorithm for adaptive downsampling to an irregular grid
JP6097488B2 (ja) * 2012-03-27 2017-03-15 三菱重工業株式会社 人工衛星システム
CN102880184B (zh) * 2012-10-24 2015-05-27 北京控制工程研究所 一种静止轨道卫星自主轨道控制方法
CN102991728B (zh) * 2012-12-27 2015-03-04 北京航空航天大学 一种基于航天器间相对运动特征量的伴飞初始化控制方法
US9647749B2 (en) * 2014-09-30 2017-05-09 Google Inc. Satellite constellation
US9745083B2 (en) * 2015-04-01 2017-08-29 Worldvu Satellites Limited Method for thermal stabilization of a communications satellite
CR20180125A (es) 2015-07-31 2018-05-14 Viasat Inc Constelación de satélites de capacidad felxible
CN105253330B (zh) * 2015-10-30 2017-04-05 中国空间技术研究院 一种基于优化的信息融合geo卫星控制系统菜单式设计方法
CN105501465A (zh) * 2015-11-30 2016-04-20 上海宇航系统工程研究所 临近空间大气环境的探测器及其运作方法
GB2557628B (en) 2016-12-13 2020-01-01 Inmarsat Global Ltd Forward link power control
FR3061481A1 (fr) * 2017-01-05 2018-07-06 Thales Systeme spatial
CN108055069A (zh) * 2017-12-11 2018-05-18 中国人民解放军战略支援部队航天工程大学 低轨通信和导航增强混合星座维持控制边界计算及控制方法
US10892818B2 (en) * 2019-05-07 2021-01-12 Contec Co., Ltd. System, apparatus and method for managing satellite operation service
CN110471432B (zh) * 2019-07-04 2020-09-08 中国科学院电子学研究所 一种卫星编队构型的方法、装置及存储介质
CN111682894A (zh) * 2020-06-09 2020-09-18 中国电子科技集团公司第五十四研究所 一种静止轨道卫星地面接收设备及应急跟踪接收方法
CN113501142B (zh) * 2021-06-17 2023-06-06 北京控制工程研究所 一种多层并联反馈的航天器控制系统及方法

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61144139A (ja) 1984-12-18 1986-07-01 Nec Corp 衛星通信方式
US4809935A (en) 1985-07-31 1989-03-07 Analytic Services, Inc. Satellite continuous coverage constellations
DE3607931A1 (de) 1986-03-11 1987-09-17 Siemens Ag Fernmeldesatellitensystem auf quasistationaeren bahnen
JPH01176966A (ja) 1987-12-30 1989-07-13 Nec Corp 衛星通信/測位方式
FR2628274B1 (fr) 1988-03-02 1990-08-10 Centre Nat Etd Spatiales Systeme de communications avec des mobiles a l'aide de satellites
JPH02128996A (ja) 1988-11-10 1990-05-17 Nec Corp 人工衛星の軌道配置方式
EP0510789B1 (en) 1991-04-22 1997-03-12 Trw Inc. Cellular telephone satellite system
US5433726A (en) 1991-04-22 1995-07-18 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications system
US5439190A (en) 1991-04-22 1995-08-08 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications
IL98893A (en) * 1991-07-19 1996-07-23 Mass Jonathan Artificial satellite communication system
FR2685833B1 (fr) 1991-12-26 1994-02-11 Agence Spatiale Europeenne Reseau de satellites de communication.
FR2686205B1 (fr) 1992-01-14 1994-03-25 Pierre Boyer Methode de controle de debit de cellules.
US6102335A (en) * 1992-06-02 2000-08-15 Mobile Communications Holdings, Inc. Elliptical orbit satellite, system, and deployment with controllable coverage characteristics
US5931417A (en) * 1992-06-02 1999-08-03 Mobile Communications Holdings, Inc. Non-geostationary orbit satellite constellation for continuous coverage of northern latitudes above 25° and its extension to global coverage tailored to the distribution of populated land masses on earth
IT1261940B (it) * 1993-09-24 1996-06-04 Alenia Spazio Spa Sistema per telecomunicazioni e telerilevamento via satellite basato sull'uso di orbite eliosincrone ellittiche di breve periodo.
JP2693708B2 (ja) 1993-09-30 1997-12-24 株式会社宇宙通信基礎技術研究所 衛星通信回線の設定方法
GB2321831B (en) * 1994-07-22 1999-02-17 Int Mobile Satellite Org Satellite communication method and apparatus
US5727057A (en) * 1994-12-27 1998-03-10 Ag Communication Systems Corporation Storage, transmission, communication and access to geographical positioning data linked with standard telephony numbering and encoded for use in telecommunications and related services
US5641134A (en) * 1994-12-27 1997-06-24 Motorola, Inc. Satellite cellular telephone and data communication system at an inclined orbit
JPH08223100A (ja) 1995-02-15 1996-08-30 Jisedai Eisei Tsushin Hoso Syst Kenkyusho:Kk 衛星通信回線の設定方法並びに移動局の位置決定と登録方法
US5845206A (en) * 1995-03-24 1998-12-01 Virtual Geosatellite Holdings, Inc. Elliptical satellite system which emulates the characteristics of geosynchronous satellites
US5890679A (en) * 1996-09-26 1999-04-06 Loral Aerospace Corp. Medium earth orbit communication satellite system
JP3153496B2 (ja) * 1997-05-21 2001-04-09 株式会社日立製作所 天頂方向での滞在時間が長い人工衛星を用いた通信サービス提供方法
US6019318A (en) * 1997-06-16 2000-02-01 Hugehs Electronics Corporation Coordinatable system of inclined geosynchronous satellite orbits
FR2818056A1 (fr) * 2000-07-27 2002-06-14 Cit Alcatel Procede et systeme de telecommunication par satellites et terminal pour un tel systeme
FR2840480B1 (fr) * 2002-05-31 2004-11-26 Cit Alcatel Procede de gestion auto-adaptative de pertinence de contenus multimedia pour recepteur de ces contenus et recepteur associe

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
1997年電子情報通信学会総合大会B−3−60、荒川範行、篠永英之、国際電信電話株式会社"周回衛星通信システム端末用通信可能時間推定機能に関する検討"
1997年電子情報通信学会総合大会B−3−61、木村和宏他、郵政省通信総合研究所"バーチャルリアリテイを用いた衛星軌道解析システムの開発"
改訂衛星通信技術、宮憲一監修、電子情報通信学会第49頁から第51頁、昭和63年6月15日第4版発行
昭和63年電子情報通信学会春季全国大会B−228、菅谷史昭他2名、KDD目黒研究所"通信測位統合システムに適した衛星軌道の提案とその基本特性"
電子情報通信学会誌Vol.79No.4pp.344−349大内智晴、有本好徳、川瀬成一郎"移動体衛星通信方式"
電子情報通信学会論文誌B−▲II▼、VOl.78−B−▲II▼、No.11pp.684−691、1995年11月、山下興慶、"グローバル衛星システムに適した低中軌道衛星配置"

Also Published As

Publication number Publication date
US6824107B2 (en) 2004-11-30
US6352222B1 (en) 2002-03-05
US6764049B1 (en) 2004-07-20
JPH1134996A (ja) 1999-02-09
US6328264B1 (en) 2001-12-11
US20030146349A1 (en) 2003-08-07
EP0880240A3 (en) 2001-12-05
US6499698B2 (en) 2002-12-31
US20020038840A1 (en) 2002-04-04
US20030029968A1 (en) 2003-02-13
US6422516B1 (en) 2002-07-23
US6634602B2 (en) 2003-10-21
EP0880240A2 (en) 1998-11-25

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