隨著物聯網概念的普及，車聯網也成為許多車廠與科技公司研究的領域。在科技的日星月異下，個人電腦的效能越來越優良，微型單板電腦也隨之興起，像是樹莓派等微型單板電腦已是許多科技人在做遠端監控、物聯網時得心應手的巧物，因此車聯網與樹莓派的結合。在過往，以軟體定義無線電實作各式通訊系統亦是使用電腦居多，近年也有許多使用筆電的研究，而如今樹莓派已出至第三代，其效能是否能搭載軟體定義無線電，並結合於車聯網中也是許多科技大廠所研究的目標，甚至是美國軍方也以樹莓派結合軟體定義無線電進行許多任務，例如搭載無人飛行載具於目標地點進行通訊收發等。在車聯網整體系統底下，車載資訊是非常重要且珍貴的數據，其重要的是我們能透過傳輸車載資訊來獲得各區域的交通狀況和鄰車的車速、加速度、油門、方向燈等，減低事故機率，更能以接收之資訊透過AI人工智慧做行車判斷。其珍貴的是當車禍或是意外事件發生時，車輛的行車資訊能讓我們進行肇事判斷，以實際證據分析肇事原因與責任歸屬，達到類似黑盒子的功能。本研究的車載資訊將透過OBD dongle來獲得。最後將樹莓派結合軟體定義無線電與接收之車載資訊進行系統主要架構，協定部分將以TDD與CSMA的概念進行設計，最終設計完成整套系統後，將在戶外的環境下進行多台裝置移動間收發，並分析實測結果與總結本研究之貢獻與未來展望。

In recent years, science and technology have been developed drastically and become complete comprehensively. With the popular issue of Internet of things (IOT), Internet of vehicle (IOV) has also been designed and discussed by many vehicle companies. According to Moore's law, the performance of a single board computer has gotten faster. Therefore, we can replace the desktop computer or notebook with micro single board computer on Software-Defined Radio (SDR) system gradually, because a desktop computer or notebook doesn’t make sense in vehicle and its inconvenience. It is important to build a stable and flexible communication system on vehicle. The inter-vehicle communication system can interact vehicle information or road’s situation with each other, even though it can broadcast the traffic information to surrounding vehicles. In the Vehicular Ad-Hoc Network (VANET) system, the frequency band of Dedicated Short Range Communication (DSRC) is at 5.9GHz. Although the band had been assigned, there is also much related research on-going in a lot of companies and universities. In order to build a stable inter-vehicle communication system, VHF band can provide features like strong noise immunity, long transmission distance, etc. The study had integrated technology such as SDR, Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) and Time-Division Duplexing (TDD) to build a flexible inter-vehicle communication system, and chose single board computer (Raspberry Pi) to be hardware device to reduce the volume of the system. Moreover, the study tested the system in real world, and analyzed the speed and stability on SDR devices. Thereafter, the study would record the usage of CPU at transmitting/receiving and discussed the performance of Raspberry Pi whether it can be an SDR and vehicle communication system’s device or not. Since a lot of SDR papers are published, the device of SDR like Universal Software Radio Peripheral (USRP) become common and cheap. The relevant product in business and industry developed further to commercial. There is no doubt that the trend will make normal communication platform and inter-vehicle communication system more flexible and convenient.

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