中低轨道卫星通信的频率特点说课材料
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工作频率波段: 业务链路: L波段 1616-1626.5MHz 星际链路: Ka波段 23.18-23.38 GHz 地面段链路:上行:Ka波段;19.4-19.6 GHz
下行:Ka波段;29.1-29.3 GHz •业务种类：话音、传真、寻呼、数据
铱系统的简历
▲ 1987年由摩托罗拉公司提出 ▲ 1997年5月5日铱系统公司首次将5颗铱卫星发 射上天 ▲到1998年5月17日共发射了67颗卫星，完成了 由66颗卫星组成的卫星星座 ▲1998年11月1日正式开始提供话音业务，11月 16日开始提供寻呼业务 ▲ 2000年3月27日铱系统正式结束业务 ▲现由新铱星公司接管，为美国国防部提供话音 和数据通信业务，2002年还补发了5颗铱星。
• Vertical market distribution strategy for voice and data services
• The U.S. Government is an anchor
customer. Actively penetrating global
8
market
Entire Network in Space
10
Satellite Technology Comparison
Traditional Satellite Systems - Inmarsat, Thuraya, Aces, Globalstar, etc.
– Architecture
• Bent pipe
– Coverage
• Regional
• Crosslink between satellites
– Coverage
• Truly Global
• Callers can be anywhere in the world
•66 satellites operate in 6 polar orbital planes 780km above the earth •Each satellite footprint approximately 5000km in diameter •All satellite footprints overlap •Each satellite has 48 spot beams •Each spot beam footprint approximately 450km in diameter •All spot beams overlap •Switch in the sky – on board processing and switching for efficiency, flexibility, and quality •Inter-satellite link enables the entire network in the sky – covers every inch on the earth and immune from terrestrial disaster •13 in orbital spare satellites
7
Iridium Satellite LLC
• System acquired Dec 2000
Overview
• Committed, multinational investor group from Saudi Arabia, Brazil, Australia, and USA
• Commercial service re-introduced March 2001 with maintainable cost structure
• the only system with continuous visibility of multiple satellites for high reliability
Constellation Capacity
• process and control >72,000 simultaneous phone calls
中低轨道卫星通信的 频率特点
解放军理工大学通信工程学院 李广侠
1
报告内容
一、中低轨卫星通信系统的现状 二、中低轨卫星通信特点和频率 三、发展我国星座卫星通信及启动频率论证
2
第一部分 中低轨道卫星通信的现状
3
wk.baidu.com
“铱”系统-典型的中低轨卫星通信系统
铱星网络结构图
5
铱星概述
空间段：星数：66＋6 轨道数：6个 轨道高度：780公里 运行周期：100分钟28秒 点波束数量：48个/卫星
• Strategic relationship with Boeing for satellite constellation operations and maintenance
• 2014 constellation lifespan
• Significantly reduced price and simplified pricing plan
The only operator capable of providing truly global voice and data serv9ice
Ubiquitous Coverage
• the only system with true global availability
Seamless Operations
• support >2 M active customers
Matured Implementation
• completely de-bugged system
Financial Stability
• Debt free and break-even in operations
Satellite Constellation
• Callers and earth stations must be under same satellite
Iridium - Entire Telecommunications Network in Space
– Architecture
• Onboard processing and switching
下行:Ka波段;29.1-29.3 GHz •业务种类：话音、传真、寻呼、数据
铱系统的简历
▲ 1987年由摩托罗拉公司提出 ▲ 1997年5月5日铱系统公司首次将5颗铱卫星发 射上天 ▲到1998年5月17日共发射了67颗卫星，完成了 由66颗卫星组成的卫星星座 ▲1998年11月1日正式开始提供话音业务，11月 16日开始提供寻呼业务 ▲ 2000年3月27日铱系统正式结束业务 ▲现由新铱星公司接管，为美国国防部提供话音 和数据通信业务，2002年还补发了5颗铱星。
• Vertical market distribution strategy for voice and data services
• The U.S. Government is an anchor
customer. Actively penetrating global
8
market
Entire Network in Space
10
Satellite Technology Comparison
Traditional Satellite Systems - Inmarsat, Thuraya, Aces, Globalstar, etc.
– Architecture
• Bent pipe
– Coverage
• Regional
• Crosslink between satellites
– Coverage
• Truly Global
• Callers can be anywhere in the world
•66 satellites operate in 6 polar orbital planes 780km above the earth •Each satellite footprint approximately 5000km in diameter •All satellite footprints overlap •Each satellite has 48 spot beams •Each spot beam footprint approximately 450km in diameter •All spot beams overlap •Switch in the sky – on board processing and switching for efficiency, flexibility, and quality •Inter-satellite link enables the entire network in the sky – covers every inch on the earth and immune from terrestrial disaster •13 in orbital spare satellites
7
Iridium Satellite LLC
• System acquired Dec 2000
Overview
• Committed, multinational investor group from Saudi Arabia, Brazil, Australia, and USA
• Commercial service re-introduced March 2001 with maintainable cost structure
• the only system with continuous visibility of multiple satellites for high reliability
Constellation Capacity
• process and control >72,000 simultaneous phone calls
中低轨道卫星通信的 频率特点
解放军理工大学通信工程学院 李广侠
1
报告内容
一、中低轨卫星通信系统的现状 二、中低轨卫星通信特点和频率 三、发展我国星座卫星通信及启动频率论证
2
第一部分 中低轨道卫星通信的现状
3
wk.baidu.com
“铱”系统-典型的中低轨卫星通信系统
铱星网络结构图
5
铱星概述
空间段：星数：66＋6 轨道数：6个 轨道高度：780公里 运行周期：100分钟28秒 点波束数量：48个/卫星
• Strategic relationship with Boeing for satellite constellation operations and maintenance
• 2014 constellation lifespan
• Significantly reduced price and simplified pricing plan
The only operator capable of providing truly global voice and data serv9ice
Ubiquitous Coverage
• the only system with true global availability
Seamless Operations
• support >2 M active customers
Matured Implementation
• completely de-bugged system
Financial Stability
• Debt free and break-even in operations
Satellite Constellation
• Callers and earth stations must be under same satellite
Iridium - Entire Telecommunications Network in Space
– Architecture
• Onboard processing and switching