基于Ethernet AVB的汽车混合网络的分析与设计

发布时间：2018-02-12 07:32

本文关键词： Ethernet AVB BroadR-Reach CAN总线车载混合网络　出处：《重庆邮电大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着汽车的信息化、智能化发展,人们对互联智能汽车需求越来越大,越来越多的先进技术在汽车上得到应用,如高级驾驶辅助系统(ADAS,Advanced Driver Assistance Systems)、360度全景泊车系统和蓝光DVD播放系统,这些新特性驱动了对车载网络中高带宽的需求。然而,现行的以CAN总线为主的车载网络在传输带宽和扩展性等方面受到制约,难以满足人们的现实需求。而随着车载以太网技术的出现,为解决上述问题提供了新的技术手段。车载以太网主要包括BroadR-Reach传输物理层和Ethernet AVB(Audio/Video Bridging)协议栈两大部分,其具有高带宽、强扩展能力和开放的架构等特点,并可在单对非屏蔽双绞线上实现100Mbps全双工通信,可满足未来车身网络通信的需求。针对上述问题,本文重点研究基于Ethernet AVB协议栈和CAN总线的车载混合网络,以期为未来车载混合网络的发展提供新的思路。本论文主要研究内容如下:首先,深入调研了车载混合网络技术的发展现状,分析了目前车载混合网络技术中存在的问题,并针对该问题,研究了车载以太网目前的相关技术,并与传统车载网络进行对比,分析总结了车载以太网的技术优势。其次,重点分析研究了车载以太网的BroadR-Reach传输物理层和AVB软件协议栈实现的关键技术,设计并搭建了基于Ethernet AVB协议栈和CAN总线的车载混合网络,实现了Ethernet AVB的Talker节点和Listener节点间视频流的传输,并可通过CAN网络实现对Ethernet AVB网络视频流的传输控制。最后,针对设计的车载混合网络结构特点,搭建了混合网络系统测试平台,并根据混合网络的通信原理,利用车载以太网测试工具CANoe.Ethernet,分别对混合网络进行了系统功能测试,系统性能测试和行人图像识别案例测试,实验测试结果表明,本文设计的基于Ethernet AVB的车载混合网络,可以实现车载视频图像的传输功能,且图像传输延迟小于2ms,满足车载以太网的通信标准,为将来车载以太网的研究奠定了理论基础,具有一定的参考价值。
[Abstract]:With the development of automobile information and intelligence, more and more advanced technologies are applied to the automobile. For example, Advanced Driver Assistance Systems 360-degree panoramic parking system and Blu-ray DVD playback system, these new features drive the demand for high bandwidth in vehicular networks. The current vehicular network based on CAN bus is restricted in transmission bandwidth and expansibility, so it is difficult to meet the actual needs of people. However, with the emergence of on-board Ethernet technology, It provides a new technical method to solve the above problems. The on-board Ethernet mainly includes two parts: BroadR-Reach transport physical layer and Ethernet AVB(Audio/Video bridging protocol stack, which have the characteristics of high bandwidth, strong expansibility and open architecture, etc. 100 Mbps full-duplex communication can be realized on single pair of unshielded twisted-pair wires, which can meet the needs of future body network communication. In view of the above problems, this paper focuses on the study of vehicle-mounted hybrid network based on Ethernet AVB protocol stack and CAN bus. The main contents of this thesis are as follows: firstly, the current situation of vehicle hybrid network technology is deeply investigated, and the problems existing in the current vehicle hybrid network technology are analyzed. Aiming at this problem, the related technologies of on-board Ethernet are studied, and compared with the traditional on-board network, the technical advantages of on-board Ethernet are analyzed and summarized. Secondly, The key technologies of BroadR-Reach transport physical layer and AVB software stack realization of on-board Ethernet are analyzed, and the hybrid network based on Ethernet AVB protocol stack and CAN bus is designed and built. The transmission of video stream between Talker node and Listener node of Ethernet AVB is realized, and the transmission control of video stream in Ethernet AVB network can be realized through CAN network. Finally, the test platform of hybrid network system is built according to the characteristics of hybrid network structure. According to the communication principle of the hybrid network, the system function test, system performance test and pedestrian image recognition case test of the hybrid network are carried out by using the on-board Ethernet testing tool CANoe.Ethernet. the experimental results show that, The vehicle hybrid network based on Ethernet AVB can realize the transmission function of the vehicle video image, and the image transmission delay is less than 2 Ms, which satisfies the communication standard of the on-board Ethernet, and lays a theoretical foundation for the future research of the on-board Ethernet. It has certain reference value.
【学位授予单位】：重庆邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.6

【参考文献】