基于Android的超短波电台多媒体传输系统
发布时间：2018-11-01 11:27
【摘要】：超短波电台作为战术通信系统中的中继台、终端台以及移动站,是军事通信中常用的设备,具有抗干扰性强、通信频带宽等特点。传统的超短波电台以话音和简单的数据传输为核心功能,话音通信无法更好地描述战况,数据传输需要使用电脑,便携性差,很难再适应现代战场通信。为此,本文对超短波电台的传输业务功能提出了更高的设计需求。本文从实际战场运用出发设计了多媒体传输系统,使得超短波电台具备图像、文字以及视频传输,大大提高了系统的便携性、实用性。该系统采用Android手机App采集多媒体信息并对信息进行编码压缩打包,按照特殊的传输协议传输,通过Wifi发送给超短波电台,超短波电台通过射频信号将信息发送给收方电台,最后由PC端上位机软件实时解码显示传输信息。论文首先介绍了这一课题相关背景以及研究现状,并对Android系统架构、H.264压缩编码标准以及JPEG图像压缩算法进行研究,同时还仿真分析了运动估计中的全搜索、菱形搜索、六边形搜索算法。其次介绍了超短波电台的硬件结构以及数据传输特点,并围绕超短波电台为中心设计整个系统框架。本文针对整个系统链路进行分层建模,分析超短波电台的传输特点采用UDP传输数据,并对TCP协议中的停止等待协议以及流水线传输方式进行了研究,在此基础上,研究制定适合超短波电台的图片传输RDTP协议,实现了可靠传输。在视频传输协议方面,本文比较传统的RTP包封装方案,采用了一种基于帧长度的RTP包封装方案。本文在具体的设计实现过程中,设计了Android系统的App,App除了实现图像和文字信息采集以外,还对图像进行JPEG压缩编码以及H.264编码。文字和图片数据按照RDTP协议传输,而实时视频流数据按照RTP/UDP传输。本文还设计实现了嵌入式Wifi接口模块,并将u C/OS-ii移植到该模块上,在该模块上编程实现超短波电台与手机以及PC端的无线通信。最后在PC端设计了界面友好的上位机软件,接收数据并实时显示文字、图像以及视频。经系统测试,结果表明整个多媒体系统符合设计需求,可在超短波电台上实现图片、文字、实时视频传输。
[Abstract]:As the relay station, terminal station and mobile station in tactical communication system, ultrashort radio is a common equipment in military communication, which has the characteristics of strong anti-jamming and communication frequency bandwidth. The traditional ultrashort wave radio station has the core function of voice and simple data transmission. Voice communication can not describe the situation of war better. Data transmission needs to use computer, so it is difficult to adapt to modern battlefield communication. Therefore, this paper puts forward a higher design requirement for the transmission service function of ultrashort wave radio station. This paper designs a multimedia transmission system based on the actual battlefield application, which makes ultrashort wave radio station with image, text and video transmission, which greatly improves the portability and practicability of the system. The system uses Android mobile phone App to collect multimedia information and encode, compress and package the information. According to the special transmission protocol, the system transmits the information to the ultrashort radio station through Wifi, which sends the information to the receiver station through radio frequency signal. Finally, the transmission information is decoded and displayed by PC software. Firstly, this paper introduces the background and research status of this subject, and studies the Android system architecture, H.264 compression coding standard and JPEG image compression algorithm. At the same time, it also simulates and analyzes the full search and rhombus search in motion estimation. Hexagonal search algorithm. Secondly, the hardware structure and data transmission characteristics of ultrashort wave station are introduced, and the whole system frame is designed around the center of ultrashort wave station. In this paper, the hierarchical modeling of the whole system link is carried out, and the transmission characteristics of ultrashort wave radio are analyzed by using UDP, and the stop wait protocol and pipeline transmission mode in TCP protocol are studied. The RDTP protocol suitable for ultrashort wave radio transmission is studied and the reliable transmission is realized. In the aspect of video transmission protocol, this paper compares the traditional RTP packet encapsulation scheme, and adopts a frame length based RTP packet encapsulation scheme. In this paper, in the process of design and implementation, the App,App of Android system is designed. In addition to the image and text information collection, the JPEG compression coding and H. 264 coding of the image are also carried out. Text and picture data are transmitted according to RDTP protocol, while real-time video stream data is transmitted according to RTP/UDP. The embedded Wifi interface module is also designed and implemented in this paper, and u C/OS-ii is transplanted to the module. The wireless communication between ultrashort wave radio station, mobile phone and PC terminal is realized by programming on this module. At last, a friendly interface software is designed in PC to receive data and display text, image and video in real time. The system test results show that the whole multimedia system meets the design requirements and can transmit pictures, text and real-time video on ultrashort wave radio station.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN924;TN919.8
本文编号：2303783
[Abstract]:As the relay station, terminal station and mobile station in tactical communication system, ultrashort radio is a common equipment in military communication, which has the characteristics of strong anti-jamming and communication frequency bandwidth. The traditional ultrashort wave radio station has the core function of voice and simple data transmission. Voice communication can not describe the situation of war better. Data transmission needs to use computer, so it is difficult to adapt to modern battlefield communication. Therefore, this paper puts forward a higher design requirement for the transmission service function of ultrashort wave radio station. This paper designs a multimedia transmission system based on the actual battlefield application, which makes ultrashort wave radio station with image, text and video transmission, which greatly improves the portability and practicability of the system. The system uses Android mobile phone App to collect multimedia information and encode, compress and package the information. According to the special transmission protocol, the system transmits the information to the ultrashort radio station through Wifi, which sends the information to the receiver station through radio frequency signal. Finally, the transmission information is decoded and displayed by PC software. Firstly, this paper introduces the background and research status of this subject, and studies the Android system architecture, H.264 compression coding standard and JPEG image compression algorithm. At the same time, it also simulates and analyzes the full search and rhombus search in motion estimation. Hexagonal search algorithm. Secondly, the hardware structure and data transmission characteristics of ultrashort wave station are introduced, and the whole system frame is designed around the center of ultrashort wave station. In this paper, the hierarchical modeling of the whole system link is carried out, and the transmission characteristics of ultrashort wave radio are analyzed by using UDP, and the stop wait protocol and pipeline transmission mode in TCP protocol are studied. The RDTP protocol suitable for ultrashort wave radio transmission is studied and the reliable transmission is realized. In the aspect of video transmission protocol, this paper compares the traditional RTP packet encapsulation scheme, and adopts a frame length based RTP packet encapsulation scheme. In this paper, in the process of design and implementation, the App,App of Android system is designed. In addition to the image and text information collection, the JPEG compression coding and H. 264 coding of the image are also carried out. Text and picture data are transmitted according to RDTP protocol, while real-time video stream data is transmitted according to RTP/UDP. The embedded Wifi interface module is also designed and implemented in this paper, and u C/OS-ii is transplanted to the module. The wireless communication between ultrashort wave radio station, mobile phone and PC terminal is realized by programming on this module. At last, a friendly interface software is designed in PC to receive data and display text, image and video in real time. The system test results show that the whole multimedia system meets the design requirements and can transmit pictures, text and real-time video on ultrashort wave radio station.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN924;TN919.8
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