本文選題：物聯網　切入點：信息采集終端　出處：《濟南大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著嵌入式技術的發(fā)展，物聯網與嵌入式技術相融合是新的發(fā)展方向，物聯網信息傳輸和后期數據處理已相對成熟，前端信息的采集是時下最需要解決的關鍵問題。因物聯網信息的復雜化，單一的射頻采集已不能滿足需要，在這個背景下提出了包含射頻和視頻的物聯網信息采集方案，將會加快物聯網的發(fā)展，拓寬了應用的領域，具有一定的現實意義和應用前景。 為實現射頻和視頻信息的采集處理，采用了TI的基于達芬奇架構的ARM+DSP雙核處理芯片DM6467作為控制處理器。ARM主要作為控制器，，對射頻、視頻采集處理等任務進行合理調度；DSP則主要負責處理所采集的數據，如H.264算法等。課題主要通過硬件和軟件兩方面對系統(tǒng)進行設計開發(fā)。 系統(tǒng)硬件利用了嵌入式系統(tǒng)的模塊化設計，包含了視頻采集模塊、射頻RFID讀寫器模塊、存儲模塊、電源模塊和其他外圍接口模塊。其中視頻采集模塊選用了TI的視頻編解碼芯片TVP5158來實現四路視頻的采集；射頻模塊選用了AS3992來實現915MRFID讀寫器的設計，考慮到該芯片本身的輸出功率其讀寫距離有限等問題，需要經過功率放大電路、低通濾波、隔離電路來保證讀寫器的識別距離和抗干擾能力。 系統(tǒng)的軟件設計，主要包括系統(tǒng)移植、Linux驅動開發(fā)和視頻采集編碼的實現。為了更好的對系統(tǒng)進行調度，需要移植Linux操作系統(tǒng)管理系統(tǒng)的任務、資源。搭建好軟件開發(fā)平臺后，制作修改引導程序U-boot，移植Linux內核及根文件系統(tǒng)。然后添加TVP5158、I2C等的驅動，利用Linux多線程原理來實現視頻采集編碼顯示，各線程間做同步處理。進行了Codec Engine理論研究，通過Codec Engine來完成ARM與DSP算法的通信，編寫H.264算法實現視頻圖像的采集編碼。 本文完成了包含射頻、視頻采集的系統(tǒng)硬件、軟件的整體設計。視頻采集編碼顯示正常，采集圖像流暢清晰，無丟幀現象，達到了設計要求。實現的物聯網信息采集終端可廣泛應用于酒店、科研、銀行等需要身份認證的安防和物流、運輸等領域，市場前景廣闊。
[Abstract]:With the development of embedded technology, the integration of Internet of things and embedded technology is a new development direction. The acquisition of front-end information is the most important problem to be solved nowadays. Because of the complexity of Internet of things information, the single RF acquisition can not meet the needs. Under this background, a scheme of collecting information from Internet of things including RF and video is proposed. It will speed up the development of the Internet of things, widen the application field, have certain practical significance and application prospect. In order to realize the acquisition and processing of RF and video information, the ARM DSP dual-core processing chip DM6467 based on da Vinci architecture is used as the control processor. Arm is mainly used as the controller. DSP is mainly responsible for processing the collected data, such as H.264 algorithm, etc. The system is designed and developed by hardware and software. The hardware of the system uses the modular design of embedded system, including video acquisition module, RF RFID reader module, storage module. Power module and other peripheral interface modules. Among them, the video acquisition module uses TI's video codec chip TVP5158 to realize four channels of video acquisition, the RF module uses AS3992 to realize the design of 915MRFID reader, and the RF module uses AS3992 to realize the design of 915MRFID reader. Considering that the output power of the chip itself is limited and its reading and writing distance is limited, the power amplifier circuit, low pass filter and isolation circuit are needed to ensure the recognition distance and anti-interference ability of the reader. In order to schedule the system better, the task and resources of Linux operating system management system should be transplanted, and the software development platform should be built. The modified boot program U-bootprogram is made, the Linux kernel and the root file system are transplanted. Then the driver of TVP5158PI2C is added to realize the video capture and coding display by using the principle of Linux multithreading, and the synchronization among the threads is done. The theoretical study of Codec Engine is carried out. The communication between ARM and DSP algorithm is accomplished by Codec Engine, and H.264 algorithm is written to realize video image acquisition and coding. In this paper, the hardware and software design of the system including RF and video capture is completed. The video capture code shows normally, the captured image is clear and fluent, and there is no loss of frame. The Internet of things information collection terminal can be widely used in hotel, scientific research, bank and other fields such as security and logistics, transportation and so on.
【學位授予單位】：濟南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TP391.44;TN929.5

【參考文獻】

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本文編號：1609204