leo satellite

the first topic mainly studies the routing strategies of leo satellite communication system with intersatellite links.

作者首先针对具有星际链路的低轨（LEO）卫星系统，深入研究了系统的路由策略。

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in leo satellite networks with inter-satellite links, the highly dynamic topology and the limited on-board resources pose special challenges to routing protocol design.

在具有星际链路的低地球轨道（LEO）卫星网络中，高度动态的网络拓扑和受限的星上资源为其路由协议设计带来很大的挑战。

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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.

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。

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· considering the doppler frequency offset, transmission noise and free space loss, we build the channel model of leo satellite communication system and study the realization techniques of each part of theoretical model.

·考虑多径和阴影衰落、多普勒频移、传播噪声和自由空间损耗等因素，建立低轨卫星移动通信的信道传输模型；研究理论模型各部分的实现技术。

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in particular, we deeply analyze the access and handoff procedure in leo satellite system to provide a theoretic model to facilitate the analysis in the following sections.

特别地，本章对低轨卫星通信接入与切换进行了深入分析，为后续章节的系统研究提供了理论基础。

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the design principles, technical terminal equipment and the implementation of the leo satellite-based mobile communications system are described in this article.

本文介绍全球星低轨移动卫星通信系统的设计思想、技术体系和终端设备以及目前的实施情况。

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analysis of the impact of earth rotation on leo satellite mobility model is provided.

分析了地球自转给低轨卫星动态模型带来的影响；

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moreover, the queuing of the new traffic has been taken to improve the performance of the whole leo satellite communication system.

此外，将信道预留与新的到达业务排队策略相结合，可以进一步提高低地球轨卫星移动通信系统的整体性能。

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theory analysis and simulation experiments have been made to evaluate the performance of scps-tp in leo satellite networks, so as to select the congestion avoidance mechanism.

为分析SCPS-TP在LEO卫星网中的性能和选择合适的拥塞避免机制，进行原理分析和仿真实验。

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in this paper, i propose two channel reservation strategies to improve the performance of leo satellite communication system.

本文在信道分配策略方面提出了两种新的策略，通过仿真验证均能有效提高系统性能。

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in order to realize efficient information transmission in leo satellite network, routing problem must be faced above all.

想要实现卫星网络信息的高效性传输，首先需要面对的就是路由问题。

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with the simultaneously generated precision series, the response of ionospheric phase delay to the leo satellite orbit biases is assessed and analyzed.

以同步生成的模拟精度序列为参照，就掩星观测中电离层延迟对LEO卫星轨道误差的响应程度进行了估计和分析。

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this project is aimed at implementing the emulator of the leo satellite system to simulate its propagation characteristics.

本课题的目的就是研制一套低轨卫星信道模拟系统，模拟低轨卫星信道传播特性。

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the simulation result indicates that the proposed scheme can realize the isolation between the handoff and the registration procedure and be used in the leo satellite ip networks.

试验结果表明，该方案实现了切换与注册与绑定更新过程的分离，可以应用在LEO卫星IP网络中。

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the small leo satellite communication is the trend of satellite communications. the mobile leo small satellite cdma communication is the joint result of satellite communications and land mobile communications.

低轨卫星是未来卫星通信发展的趋势，低轨卫星星座CDMA移动通信系统是卫星通信和地面移动通信发展的结晶。

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simulations show that the computing complexity and the tree cost are lower than the traditional multicast routing algorithm for leo satellite networks.

仿真结果表明：与传统的LEO卫星网络组播路由算法相比，该算法具有较低的计算复杂度，生成的组播路由树具有较小的开销。

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however, there are still some problems to be studied for its practical application. firstly, there is multi-satellite coverage for the user in leo satellite communication systems.

然而，为促进低轨卫星通信系统的全面应用，依然还存在一些关键问题需要研究。

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in order to reduce the registration frequency and the handoff latency in leo satellite ip networks, a vmr-based handoff management scheme was presented.

为了缓解LEO卫星IP网络的注册和绑定更新频率并降低切换延时，提出了基于虚拟移动路由器（VMR）的切换管理方案。

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The broadband LEO satellite mobile communication system will play an important role in providing services to mobile terminal user anytime and anywhere, which becomes a significant component of the air-space-ground integrated information network.

低轨宽带卫星移动通信系统将随时随地为各种接入用户终端提供宽带服务，成为空天地一体化信息网络的重要组成部分。

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simulation of impacts of single leo satellite orbit parameters on gnss reflection event's distribution and number

单颗LEO卫星轨道参数对GNSS反射事件分布和数量影响的模拟研究

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based on the analyses of traditional routing schemes proposed for satellite networks, a discrete time based loop-free routing algorithm ( dtra) for leo satellite networks was developed.

在分析传统卫星网络路由算法的基础上，提出一种基于分时的LEO卫星网络无环路由算法（DTRA）。

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by comparing several typical channel assignment algorithms, combined with its own characteristics of leo satellite systems, an improved adaptive channel allocation strategy was designed.

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。

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this paper compares the ground mobile communication system and leo satellite mobile communication system, then designs a cac for leo satellite communication system.

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。

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an important aspect of the leo satellite network is to manage the location of both users and satellites.

位置管理技术作为低轨卫星移动通信系统的一项关键技术，关系着整个网络的性能。

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chapter 2 studies the principle of the leo satellite cdma transmission system.

第二章研究了低轨卫星CDMA传输系统的原理。

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cz-2c is a two-stage liquid propellant launch vehicle, which is suitable for launching heavier leo satellite.

摘要CZ-2C是适用于发射低轨道、质量较大卫星的二级液体运载火箭。本文简述了CZ-2C的由来；

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an important aspect of leo satellite communication system is to manage the radio resources.

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。

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handoff is an important part of mobile management in leo satellite communication system.

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。

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a diffusion-based multi-path routing protocol for leo satellite networks

一种基于扩散机制的LEO卫星网络多径路由协议

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a pre-authentication based fast handoff algorithm for leo satellite networks

基于预认证的LEO卫星网络快速切换算法

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