摘要：轨道交通在我们的日常出行方式中占据了不可替代的重要地位。火车车厢的乘客具有一定的机动性，人员比飞机和汽车更复杂，更集中。因此，乘客财产和人身安全受到纠纷、火灾、盗窃等安全隐患的威胁。采用先进的监控设备和数据传输系统及终端显示设备对车辆进行实时监控，可以减少突发事故对乘坐人员人身安全和财产的损伤，并且保障列车系统的高效工作。

本次毕业设计采用AR9331芯片，摄像头分辨率为320*240，采用普通WIFI局域网实现802.11n标准协议。简要分析了客车车厢视频监控系统的发展历史和发展现状，分析了系统的先进性及弊端，对相关概念Java、RTP/RTCP、OpenWrt等进行了简要介绍，分析了车厢视频监控系统信号传输设计的可行方案。本次毕业设计考察了监控系统的系统结构、性能参数等，参考了闭路电视传输系统的优秀方案，构建了具有稳定性、可靠且先进、易维护的实时监控系统。

关键字: 轨道交通；客车车厢内视频监控系统；信号传输；RTP/RTCP；CCTV

Video surveillance system in the passenger compartment signal transmission design

Abstract：Rail transit plays an irreplaceable role in our daily travel mode. The passengers of the train have certain mobility, and the personnel are more complex, more concentrated and smaller than planes and cars. Therefore, passengers' property and personal safety are threatened by hidden dangers such as disputes, fires and theft. The use of advanced monitoring equipment and data transmission system and terminal display equipment to monitor the vehicle in real time can reduce the safety and property damage to the personal safety and property of the passengers and ensure the efficient work of the train system.

This time, the AR9331 chip is used, the resolution of the camera is 320*240, and the standard WIFI protocol is used to implement the 802.11n standard protocol. This paper briefly analyzes the development history and development status of the video surveillance system in passenger cars, analyzes the advanced and malpractice of the system, briefly introduces related concepts such as Java, RTP/RTCP and OpenWrt, and analyzes the feasible scheme of signal transmission design of the car video surveillance system. The system structure and performance parameters of the monitoring system are investigated, and the excellent scheme of closed circuit television transmission system is referred to, and a real-time monitoring system with stability, reliability, advanced and easy maintenance is constructed.

Key Words: Rail transit ；Passenger car video surveillance systems；Signal transmission；RTP/RTCP；CCTV

目录

1 绪论 1

1.1 本课题的背景和研究目的 1

1.2 本课题的发展历史及现状 1

1.2.1阶段一：视频数字化 2

1.2.2阶段二：监控网络化 2

1.2.3阶段三：侦测智能化 2

2 视频监控系统的可行性探究 4

2.1 系统合理性 4

2.1.1 互联性及开放性 4

2.1.2 可拓展性 4

2.1.3 高可靠性及稳定性 5

2.1.4经济实用性 5

2.1.5 维护便捷性 5

2.1.6较高的系统安全程度 5

2.2相关成熟产品简介 5

2.3系统规模普及性 6

2.3.2 视频传输的实时性 6

2.3.3 Ar9331 SOC芯片易维护性 6

2.3.4 操作简单，界面简洁 6

3 相关概念简述 7

3.1 java语言简介 7

3.2 RTP/RTCP简介 7

3.2.1 RTP功能简介 7

3.2.2 RTCP功能简介 8

3.3 OpenWRT功能简介 8

4 客车车厢视频监控系统在Wi-Fi局域网内的信号传输方案设计 9

4.1 系统方案设计 9

4.2系统TTL改装设计实验过程 12

5 客车车厢视频监控系统的功能实现 13

5.1 JMF构架实现视频信号实时传输的构架及参数 13

5.2系统主要工作流程 13

6 客车车厢内视频监控系统设置与设计 15