基于OSGI的深空通信网络仿真平台研究与应用

发布时间：2018-10-10 10:49

【摘要】：随着航天技术的发展,人类对于外层空间的探测范围也在不断地扩大,同时深空通信也面临着更大的挑战。由于深空探测存在高风险和高成本等特点,因此研究者在通信方案具体实施之前必须对方案的可行性进行严密论证。作为论证协议与方案可行性重要手段的计算机仿真已经可以对空间通信的方案进行部分模拟。但是相比于深空通信技术的发展速度,深空通信方面的计算机仿真技术的发展速度明显滞后。大部分仿真软件无法精确模拟深空环境,同时也无法实现协议的定制化开发。为了弥补现有仿真软件的不足,本文拟设计一套能够真实模拟深空通信环境、支持自由定制仿真场景与协议、伸缩性和可复用性较强的深空通信仿真平台。该平台应用组件式开发技术,将OSGI(Open Service Gateway Initiative,开放服务网关)作为整个平台运行的基础。该规范也是组件化技术的标准开发规范。该规范使得整个仿真平台具有稳定和高效的特点。同时,通过对深空通信协议的总结和归纳,本文设计并实现了基于离散事件的通信仿真框架。相比于其它仿真框架,该框架仿真精度和运行效率更高。本文通过与卫星工具包(Satellite Tool Kit,STK)进行交互去实现深空仿真场景的创建工作。搭建出来的仿真场景能够真实反映深空环境的长时延、高误码率以及链路周期性频繁中断等特性。最后,为了验证仿真平台的可靠性,本文以地火通信和图像文件传输为背景,选择不同仿真场景、不同中继方案的延时型CCSDS文件传输协议(CCSDS File Delivery Protocol,CFDP)协议作为验证对象。本文从文件传输的角度对平台的运行结果进行展示,并从系统有效性的角度对协议仿真结果与理论计算值进行比较,证明了本文设计仿真平台能够完成仿真深空网络协议的功能。
[Abstract]:With the development of space technology, the exploration range of outer space is expanding, and the deep space communication is facing more challenges. Because of the characteristics of high risk and high cost in deep space exploration, researchers must demonstrate the feasibility of the scheme before it is implemented. Computer simulation, which is an important means to demonstrate the feasibility of the protocol and scheme, can be used to simulate the scheme of space communication. But compared with the development speed of deep space communication technology, the development speed of computer simulation technology in deep space communication obviously lags behind. Most simulation software can not accurately simulate the deep space environment, but also can not achieve customized protocol development. In order to make up for the deficiency of the existing simulation software, this paper intends to design a set of deep space communication simulation platform which can simulate the deep space communication environment, support the free customization of simulation scenarios and protocols, and have strong scalability and reusability. The platform uses component development technology and takes OSGI (Open Service Gateway Initiative, Open Service Gateway as the basis of the whole platform. This specification is also the standard development specification of component technology. This specification makes the whole simulation platform stable and efficient. At the same time, the communication simulation framework based on discrete events is designed and implemented by summarizing and summarizing the deep space communication protocols. Compared with other simulation frameworks, the simulation accuracy and efficiency of the framework are higher. This paper interacts with (Satellite Tool Kit,STK to realize the creation of deep space simulation scene. The simulation scene can truly reflect the characteristics of long delay, high bit error rate and periodic frequent interruption of the link in the deep space environment. Finally, in order to verify the reliability of the simulation platform, this paper takes the ground fire communication and image file transmission as the background, and selects the delay CCSDS file transfer protocol (CCSDS File Delivery Protocol,CFDP) protocol of different simulation scenarios and different relay schemes as the verification object. This paper presents the results of the platform from the point of view of file transfer, and compares the protocol simulation results with the theoretical results from the point of view of system effectiveness. It is proved that the simulation platform designed in this paper can accomplish the function of simulating the deep space network protocol.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN927

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