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.
第二章研究了低轨卫星CD MA传输系统的原理。
Chapter 2 studies the principle of the LEO satellite CDMA transmission system.
来自全球网络使用40低轨卫星轨道高度876公里。
The Globalstar network utilizes 40 low earth orbit satellites orbiting at an altitude of 876 miles.
无线资源管理是低轨卫星通信系统中的一个重要的研究方面。
An important aspect of LEO satellite communication system is to manage the radio resources.
研究了用于低轨卫星通信的直接序列扩频系统的码捕获技术。
It is studied that the code acquisition technology of direct sequence spread spectrum system in LEO satellite communication.
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.
差模跟踪技术在低轨卫星下行信号接收中发挥着极其重要的作用。
The differential mode tracking technology plays an important role for receiving signal of low orbit satellites.
提出了一种新的适用于多媒体低轨卫星网络的呼叫准入控制算法。
A call admission control algorithm for multimedia low orbit satellite networks was proposed.
新网络将保持66颗跨链低轨卫星的星座体系，覆盖全球所有区域。
The new network will maintain the Iridium constellation architecture of 66 cross-linked LEO satellites covering 100 percent of the globe.
铱网络使用66低轨卫星在极地轨道485公里以上的海平面。
The Iridium network uses 66 low earth orbit satellites in polar orbits 485 miles above sea level.
大气阻力是低轨卫星主要的摄动力，与高层大气密度的变化密切相关。
Atmospheric drag is the main perturbation force on a low earth orbit satellite and is closely related to the variation of high atmospheric density.
很多国家在建立了低轨卫星系统的同时，进行了卫星信道模拟器的研究。
Many countries get to research satellite communication channel emulator while building up low-orbiting 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.
铱星公司雄心勃勃的计划是通过66颗低轨卫星覆盖全球实现全球自由通信。
The firm's ambitious plan was for mobile phones which work anywhere in the world thanks to its network of 66 low orbiting satellites.
由于中国国内和东南亚地区电磁环境复杂，影响了低轨卫星扩频通信的可用性。
The availability of low orbit satellite spread-spectrum communications is impacted by the complicated radio environment in China and Southeast Asia.
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.
随着低轨卫星的应用领域不断扩大，人们对低轨卫星的轨道精度要求越来越高。
With more and more application fields of Low Earth Orbit satellites, better and better precision of LEO is needed by many people.
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.
本文针对低轨卫星扩频通信的窄带干扰和脉冲干扰抑制方法进行了研究和仿真。
In this dissertation, some methods for narrowband interference suppression and impulse interference rejection in the low orbit satellite spread spectrum communication are studied.
空间段由低轨卫星构成，为地面用户间、地面用户与信关站之间提供通信链路；
Space segment includes LEO satellites, which provide ground users and gateways with communication links;
从两个方面讨论了低轨卫星在做卫-卫跟踪（SST）观测时，星间隔的选择问题。
The problem of satellite-to-satellite tracking (SST) separation parameter be discussed in two aspects.
提出了一种适用于装备有星际链路的低轨卫星星座网的切换策略——最小跳数切换策略。
This paper proposes a new handover strategy named minimal-hops handover (MHH) strategy for the LEO satellite constellations equipped with inter-satellite link (ISL).
研究在不依赖于GPS差分基准站的情况下，利用单频gps接收机对低轨卫星进行定轨的算法。
This paper studies the orbit determination of LEO satellites using GPS receivers of single frequency in condition of not depending on GPS differential reference stations.
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.
通过对比几种典型的信道分配算法，结合低轨卫星系统自身的特点设计了一种自适应信道分配策略。
By comparing several typical channel assignment algorithms, combined with its own characteristics of LEO satellite systems, an improved adaptive channel allocation strategy was designed.
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.
低轨卫星的信道与地面无线信道具有不同的特点，低信噪比与大多普勒频移是低轨卫星信道的两个显著特征。
The channel of LEO satellite is different from wireless channels on the ground. Low SNR and large Doppler shift are the two characteristic of LEO satellite channel.
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.
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.
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