Nowadays , information becomes more and more important . to obtain more information is very necessary to gain success . furthermore , satellite telemetry and telecommand systems are being used more widely as a method to transmit information 当今社会是一个信息化的社会,获取大量的信息便抢占了先机,卫星测控系统作为传输信息的手段得到了越来越广泛的应用。
Based on how routers gather information about the structure of a network and their analysis of information to specify the best route , we have two major routing algorithms and decentralized routing algorithms 人们基于路由器收集来的关于网络拓扑结构和传输信息分析报告来确定最优路由路径，现有两种路由选择算法，基于中心控制的路由选择算法和基于动态分布式的路由选择算法。
The web services choreography languages are built on top of the wsdl specification , re - using the operations and transport information , they focus on providing choreography by composing stateless web services into state aware e - business dialogues Web服务编排语言构建在wsdl规范的顶层，可以重用操作和传输信息，它们的重点在于通过将无状态的web服务组合成已知状态的电子商务对话来提供编排。
So providing secure services in those applications is an important issue . the thesis concentrates on the security mechanism , the security implementation and services of bluetooth , which should be different from the traditional security measures of the wired world 因为蓝牙使用无线电波传输信息，对各种攻击就更加敏感，而当今的很多应用都对安全性有很高的要求，所以如何在这些应用中提过安全服务就是一个非常重要的课题。
The traditional distributions of temperature and concentration just mark the final state that a convection system has reached but convey the information about how the heat and contaminant is transported across the system , and therefore we cannot get to know the natural characteristics of convection 由于传统的温度与浓度等值线分布仅展示了对流传热传质系统所达到的最终状态，而没有提供热与污染物的传输信息或结构，因此我们无法知道对流行为的本质特征。
First of all , this paper introduces the process of transmission of data from satellites . cortex telemetry and telecommand is used to receive telemetry data . before receiving data , the digital modulation modes are recognized by a method of parallel judgement in order to tell cortex telemetry and telecommand unit to set the reception mode , and then by using cortex ’ s tcp / ip interface the remote reception is achieved 本文首先介绍了卫星传输信息的过程,然后使用cortex测控单元对遥测数据进行直接接收,在接收之前首先利用了平行判决法来实现数字调制方式的识别,以便控制cortex测控单元使用何种方式进行接收数据,实现了利用cortex测控单元的tcp / ip接口进行远程接收。
Assigning serial different address code to different subscribers , useful signal is taken out of the same time slot and frequence , and is transmitted with one share channel . at received end , system makes use of completed address code from sending end to do correlative check and take out useful subscriber signal . the other address code signals are treated as broadband disturbing signal which is removed . in radio environment of existing variable disturbtion and muti - way declining , expand frequence signal ’ s broadband characteristics can improve system performance obviously . cdma mobile telecommunication system has some better characteristics , such as anti - disturbing 、 anti - way declining 、 secrecy 、 capacity 、 utilizing rate of frequence resource and so on , than other mobile telecommunication system Cdma ( codedivisionmultipleaccess )移动通信系统的技术基础是基于扩频技术的码分多址,通过给不同的用户分配各自特定的地址码序列,将处于相同时隙和频率的用户信号分离开来,采用共享信道方式传输信息。在接收端,系统利用与发送端完全一致的本地地址码对接收信号进行相关检测,提取需要的用户信号,而将其他使用不同码型的信号视为宽带干扰而从中剔除掉。
First of all , we bring forward the basic project of tadil , which adapts to combined operations . it is suggested to use tdma ( the abbreviation of time division multiple access ) as the working pattern and utilize the concept of mobile ad hoc network to construct the data link network . aiming at the impact of time delay on data link and the characteristic of cooperative combat under the command of director aircraft , this thesis applies a kind of kalman filtering algorithm in polar coordinates to compensate the error of time delay , and then does the transformation of target motion parameters to obtain the current information of target 本文结合空军装备部某“十五”预研课题,围绕着战术数据链、多机协同多目标攻击、超机动攻击、空对地攻击这四个方面展开了一系列的研究工作:本文首先给出了适应三军联合作战的战术数据链系统的基本方案,建议采用时分多址的工作模式,并利用移动自组织网络的概念构建数据链网络,同时针对数据链传输信息的时间延迟特性和指挥机指挥下的多机协同作战特点,应用一种极坐标系下的卡尔曼滤波算法对该传输延迟误差进行补偿,并在此基础上进行目标运动参数的转换,以获得目标相对于某无人机的当前运动信息,且利用仿真验证了方法的有效性。
Persons can visit on net conventionally through net but also can attack , stole messages or destroy systems on net the electronic business is increasing , some messages are protected by the way of encryption , but in traditional method there is something trouble that the messages transported on net have the same key to encrypt data and decrypt data such as des . in this case how to distributed a secret key securely on net has n ' t a perfect solutioa while the technology of pki can solve it through distributing certificates and provide the vary net applications confidentiality , integrity , authentication and non - repudiation 随着internet以及电子商务的发展，人们对信息安全的需要越来越迫切，于是出现了依靠加密的手段保护敏感信息在网络上的安全，虽然在?定的程度上杜绝了网上传输信息的被窃取和破坏，但是依靠传统的加密手段本身就存在着安全隐患，比如说des对称加密算法)由于加密和解密采取了同一的密钥，怎样安全的分发密钥就成了难以解决的问题。
Due to these issues only using tcp congestion control mechanisms cannot assure the robustness of internet any longer , instead , the router should actively participate in the network congestion control for the most effective detection of congestion can occur in the router itself 但近年来互联网的爆炸式增长，特别是多媒体业务的广泛应用，使得互联网已经不可能再仅仅依靠基于源端的tcp拥塞控制机制，路由器本身也必须主动参与到拥塞控制中来，这是因为路由器直接掌握着互联网上的各种传输信息。
