介绍国内两种车载同步轨道卫星移动通信系统。
Two kinds of vehicle synchronous orbiting satellite mobile communication systems are introduced.
测试低轨卫星移动通信信道模拟器的硬件性能。
Test the specification of the LEO satellite communication channel simulator.
这也是我写了这份关于卫星移动通信调查报告的原因。
This is why I wrote this on satellite mobile communications for the report.
多波束天线技术是卫星移动通信系统中的关键技术之一。
Multi-beam antenna is a key technology in the satellite mobile communication system.
在卫星移动通信中，多普勒频偏是一个不能忽视的消极因素。
In satellite mobile communications, Doppler frequency offset is a negative factor that couldn't be neglected.
其次，本文对低轨卫星移动通信信道模型进行了详细的分析。
Secondly, this paper gives a detail analysis for mobile communication channel model of low-orbit satellites.
切换是LEO卫星移动通信系统中移动性管理的一个重要组成部分。
Handoff is an important part of mobile management in LEO satellite communication system.
针对具有点波束的低轨卫星移动通信系统，提出了一种信道动态预留策略。
A dynamic channel reserve strategy for LEO communication system with spot-beam is proposed.
这些都将为下一步在硬件平台上实现低轨卫星移动通信信道模拟器奠定了基础。
All these will afford more detailed theoretical basis for further studying and simulating low-orbit satellite mobile channels simulator in the hardware platform.
低轨卫星移动通信系统自从提出以来就成为全球移动通信系统的一个重要分支。
LEO satellite mobile communication system has become an important branch of global mobile communications system since it proposed.
为了降低卫星移动通信系统对地面移动通信系统的依赖，系统必须引入星际链路。
To reduce the LEO satellite mobile communication systems rely on ground mobile communication system, LEO satellite mobile communication systems must be introduced ISLs.
此外，本文还对卫星移动通信信道模拟器进行了分析，并提出了其初步整体设计方案。
In addition, the paper also analysis mobile satellite communication channel simulator, and gives its initial general design.
星座设计是卫星移动通信系统设计一个非常关键的内容，直接关系到系统的性能与成本。
Constellation design is one of the key contents for the design of satellite communications system.
低轨卫星移动通信系统中，高效的位置管理方案可以降低系统开销并且能够保证网络系统的性能。
The excellent location management scheme can reduce the system cost and improve the performance of the Low Earth Orbit Satellite Mobile Communication system.
扩频技术在数字蜂窝移动通信系统、卫星移动通信、室内无线通信和未来的个人通信中被广泛采用。
Spread Spectrum technique is widely used in digital cell-phone mobile communication system, satellite mobile communication, inside wireless communication and future personal communication.
在MEO卫星移动通信系统中，确定小区驻留时间分布对于合理地规划切换策略具有十分重要的意义。
In MEO satellite mobile communication systems, the confirmation of cell dwell duration' s distribution is very important to constitute handoff str ategies properly.
针对低轨卫星移动通信系统用户在多星覆盖的情况下的位置注册问题，提出了仰角和覆盖时间加权策略。
In LEO satellite network, MTs are always covered by more than one satellite simultaneously. A satellite selection strategy for the MT to register its location is presented in this paper.
终端位置更新速率又是卫星通信系统终端位置管理的重要指标，直接影响到海上卫星移动通信系统的性能。
Terminal location update rate (LUR) is a very important index of Marine satellite mobile communication system, which affects the performance of whole system violently.
仿真结果表明，该方法可以有效减小天线波束指向漂移，满足卫星移动通信系统对天线波束指向精度的要求。
Simulation results show that the method can reduce the excursion of beam pointing effectively, and the requirement of beam pointing accuracy for SOTM can be satisfied.
该软件界面友好，具有丰富的地图操作内容，是军用及民用卫星移动通信系统星座设计仿真、演示的有效工具。
This software has interfaces friendly and a lot of map operations. It is good for the constellation design, simulation and demo of mobile satellite communications system in military or in civil USES.
本文通过对比地面移动通信系统和低轨卫星移动通信系统，为低轨卫星通信系统设计了一种呼叫接入控制策略。
This paper compares the ground mobile communication system and LEO satellite mobile communication system, then designs a CAC for LEO satellite communication system.
阐述了卫星通信的概况以及卫星移动通信系统的分类，重点介绍了低轨卫星移动通信系统的组成及其关键技术。
The satellite mobile communication system, which is the emphasis of the academic research, is the most significant portion of the 3G communication system.
为了提高移动通信系统的容量和效率、实现全球无缝覆盖，必须实现低轨卫星移动通信系统与地面通信系统之间的有机综合。
It is necessary to integrate the LEO satellite communication systems and terrestrial mobile communication systems for improving the capacity and efficiency, achieving global seamless coverage.
并结合具体的卫星移动通信信道的复杂时变特性，对SCTCM在该信道下的误码率(BER)性能进行了理论分析，给出了误码率的一个上界。
According to the complicated time varying property of the satellite mobile communication channel, the BER performance of SCTCM in this kind of channel is analyzed and an upper bound is given.
通过对现有的卫星移动通信系统星间链路的分析发现，不但卫星移动通信系统星间链路的指向具有周期性变化的特性，而且星间链路的相对距离也在周期性变化。
Through the analysis of today's mobile satellite communication systems, it is found that not only the direction, but also the relative distance of the ISL are periodical.
MUOS将扩展和取代传统的超高频(UHF)后续通信卫星(ufo)，为移动士兵提供通信保障，包括同步语音、视频和数据。
MUOS will augment and replace the legacy Ultra High Frequency (UHF) Follow-On system (UFO) providing assured communications, including simultaneous voice, video and data, for mobile warfighters.
它的传送途径多种多样，可以有内置无线、移动电话、通信卫星以及蓝牙；
Moreover, it can do this in multiple ways, with built-in Wi-Fi, mobile, satellite and Bluetooth communication links.
Selex通信公司将提供Tetra移动通信计划，以及HF、卫星和微波无线连接。
Selex communications will provide the Tetra mobile communications technology, as well as HF, satellite and microwave radio connections.
本文简要介绍了国际海事卫星通信系统(INMARSAT)，重点对该系统的移动数据通信业务及其应用进行了探讨。
This paper gives a brief introduction on the INMARSAT system with the mobile data communication service of the system and its application being discussed in detail.
本文简要介绍了国际海事卫星通信系统(INMARSAT)，重点对该系统的移动数据通信业务及其应用进行了探讨。
This paper gives a brief introduction on the INMARSAT system with the mobile data communication service of the system and its application being discussed in detail.
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