MOBILE SATELLITE COMMUNICATION-SL1704004[49].pdf - 1 2017...

南 京 航 空 航 天 大 学
研究生考 试参考答案及评分标准
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Report examination 设计报告 100 分
题目： 卫星移动通信课程设计报告
目的： 参考 “ 铱星 ” 系统设计覆盖亚太区域的移动通信网络，根据假定的话务量，
运用蜂窝、卫星移动通信技术分析所需的空间资源并对地面上几种特定类
型的蜂窝和通信链路进行设计。
The report title: A mobile satellite system design
Targets: To design a mobile and satellite systems based on assumed requirements of
traffic, system topology by using the existing systems, such as ‘Iridium’ systems,
with considering cellular design and link budget.
2017 ～ 2018 学年 第 2 学期 Semister II
课程名称 course title
： 卫星移动通信 Satellite mobile communication
课程编号 course code
:
参考答案及评分标准制定人
：
宗鹏
Date: 2018 年 1 月 8 日
Exame and Reference answer Given by Harit Rijal SL1704004

Contents
CHAPTER ONE ................................................................................................................................................... 4
1.1 Problem Statement ...................................................................................................................................... 4
1.2 Introduction ................................................................................................................................................. 4
1.3 History of communications satellites .......................................................................................................... 5
1.4 Orbital Dynamics of Satellite System ......................................................................................................... 7
1.4.1 Kepler’s first law .................................................................................................................................. 7
1.4.2 Kepler’s second law ............................................................................................................................. 7
1.4.3 Kepler’s third law ................................................................................................................................ 7
1.5 Comparison of different orbits .................................................................................................................... 8
1.6 Hand-off ...................................................................................................................................................... 8
1.8 Doppler shift effect ..................................................................................................................................... 9
1.9 Specific issues in LEO satellite systems ..................................................................................................... 9
1.10 Selection of Satellite System .................................................................................................................. 10
CHAPTER TWO ................................................................................................................................................ 13
2.1 Introduction ............................................................................................................................................... 13
2.2 Channel Assignment Strategies ................................................................................................................. 14
2.3 Handoff Strategies .................................................................................................................................... 14
2.3.1 Prioritizing Handoffs .......................................................................................................................... 15
2.4 Interference and System Capacity ............................................................................................................ 16
2.5.1 Co-channel Interference and System Capacity .................................................................................. 16
2.5.2 Channel Planning for Wireless Systems ............................................................................................ 16
2.5.3 Adjacent Channel Interference ........................................................................................................... 17
2.6 Trunking and Grade of Service ................................................................................................................. 17
2.8 Calculation Of Link Budget and Cell Range ............................................................................................ 19
CHAPTER 3 IRIDIUM SATELLITE SYSTEM ................................................................................................ 24
3.1 Introduction ............................................................................................................................................... 24
3.2 Inter-Satellite Link .................................................................................................................................... 26
3.3 Network Connectivity ............................................................................................................................... 28
3.4 System Capacity ....................................................................................................................................... 28
3.5 Call Processing ......................................................................................................................................... 31
3.6 Routing in a Dynamic Network Topology ................................................................................................ 33
CHAPTER 4: LINK BUDGET ANALYSIS ...................................................................................................... 34
4.1 Transmission and Reception ..................................................................................................................... 34
4.2 Noise ........................................................................................................................................................ 36
4.2.1 Thermal Noise .................................................................................................................................... 36
4.3 Propagation And Interference Consideration ............................................................................................ 37
4.3.1. Radiowave Propagation .................................................................................................................... 37

4.3.2 Propagation Loss in Free Space ......................................................................................................... 37
4.4 COST -231 MODEL ................................................................................................................................. 41
4.5 Parameter Specification ............................................................................................................................ 42
4.6 Calculation of Link Budget ....................................................................................................................... 44

CHAPTER ONE
1.1 Problem Statement
With the growth in demand for wireless communications in every corner of the
world be it at the middle of ocean or in the middle of the rain forest , the need of
tools for system design optimization and radio network planning has been triggered
with many network operators joining the market. Satellite mobile communication
network design involves several inter-dependent factors such as analysis of coverage
and traffic, orbital design, satellite coverage, topography and propagation
characteristics. The selection of the number of satellites, their orbital design and
other design parameters have to be determined in the context of one another.