發(fā)布時(shí)間：2018-11-01 11:27

【摘要】：超短波電臺(tái)作為戰(zhàn)術(shù)通信系統(tǒng)中的中繼臺(tái)、終端臺(tái)以及移動(dòng)站,是軍事通信中常用的設(shè)備,具有抗干擾性強(qiáng)、通信頻帶寬等特點(diǎn)。傳統(tǒng)的超短波電臺(tái)以話音和簡(jiǎn)單的數(shù)據(jù)傳輸為核心功能,話音通信無法更好地描述戰(zhàn)況,數(shù)據(jù)傳輸需要使用電腦,便攜性差,很難再適應(yīng)現(xiàn)代戰(zhàn)場(chǎng)通信。為此,本文對(duì)超短波電臺(tái)的傳輸業(yè)務(wù)功能提出了更高的設(shè)計(jì)需求。本文從實(shí)際戰(zhàn)場(chǎng)運(yùn)用出發(fā)設(shè)計(jì)了多媒體傳輸系統(tǒng),使得超短波電臺(tái)具備圖像、文字以及視頻傳輸,大大提高了系統(tǒng)的便攜性、實(shí)用性。該系統(tǒng)采用Android手機(jī)App采集多媒體信息并對(duì)信息進(jìn)行編碼壓縮打包,按照特殊的傳輸協(xié)議傳輸,通過Wifi發(fā)送給超短波電臺(tái),超短波電臺(tái)通過射頻信號(hào)將信息發(fā)送給收方電臺(tái),最后由PC端上位機(jī)軟件實(shí)時(shí)解碼顯示傳輸信息。論文首先介紹了這一課題相關(guān)背景以及研究現(xiàn)狀,并對(duì)Android系統(tǒng)架構(gòu)、H.264壓縮編碼標(biāo)準(zhǔn)以及JPEG圖像壓縮算法進(jìn)行研究,同時(shí)還仿真分析了運(yùn)動(dòng)估計(jì)中的全搜索、菱形搜索、六邊形搜索算法。其次介紹了超短波電臺(tái)的硬件結(jié)構(gòu)以及數(shù)據(jù)傳輸特點(diǎn),并圍繞超短波電臺(tái)為中心設(shè)計(jì)整個(gè)系統(tǒng)框架。本文針對(duì)整個(gè)系統(tǒng)鏈路進(jìn)行分層建模,分析超短波電臺(tái)的傳輸特點(diǎn)采用UDP傳輸數(shù)據(jù),并對(duì)TCP協(xié)議中的停止等待協(xié)議以及流水線傳輸方式進(jìn)行了研究,在此基礎(chǔ)上,研究制定適合超短波電臺(tái)的圖片傳輸RDTP協(xié)議,實(shí)現(xiàn)了可靠傳輸。在視頻傳輸協(xié)議方面,本文比較傳統(tǒng)的RTP包封裝方案,采用了一種基于幀長(zhǎng)度的RTP包封裝方案。本文在具體的設(shè)計(jì)實(shí)現(xiàn)過程中,設(shè)計(jì)了Android系統(tǒng)的App,App除了實(shí)現(xiàn)圖像和文字信息采集以外,還對(duì)圖像進(jìn)行JPEG壓縮編碼以及H.264編碼。文字和圖片數(shù)據(jù)按照RDTP協(xié)議傳輸,而實(shí)時(shí)視頻流數(shù)據(jù)按照RTP/UDP傳輸。本文還設(shè)計(jì)實(shí)現(xiàn)了嵌入式Wifi接口模塊,并將u C/OS-ii移植到該模塊上,在該模塊上編程實(shí)現(xiàn)超短波電臺(tái)與手機(jī)以及PC端的無線通信。最后在PC端設(shè)計(jì)了界面友好的上位機(jī)軟件,接收數(shù)據(jù)并實(shí)時(shí)顯示文字、圖像以及視頻。經(jīng)系統(tǒng)測(cè)試,結(jié)果表明整個(gè)多媒體系統(tǒng)符合設(shè)計(jì)需求,可在超短波電臺(tái)上實(shí)現(xiàn)圖片、文字、實(shí)時(shí)視頻傳輸。
[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.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN924;TN919.8

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本文編號(hào)：2303783