軟體定義無線電(SDR)與一般傳統無線電通訊系統的差異就在於SDR是透過軟體來建置像硬體中某些組成元件，例如：濾波器、放大器、解調變訊號等的功能，目的就是盡量把無線電系統中類比的部分都交由軟體來完成。在過去與海事通訊相關的SDR的研究中，多著重以SDR應用於船舶自動識別系統(AIS)搭載衛星探測的討論，不同於以往，本研究從SDR的概念設計來導入一般常見的海事無線電通訊系統應用目標，建立一個以SDR為基礎搭載的AIS實驗平台後，接收來自港邊船舶所發射的AIS訊號為例，並與實務驗證，得出符合的結果。
本研究以ITU導入一個新系統的可行性評估模型為基礎建立本研究架構，評估面向從技術面、法規面、人力資源面、財務面來討論後，再進行SDR與傳統無線通訊系統的優缺點分析，本研究得出的結果為技術面可行、法規面涉及的監管環境仍有缺乏、人力資源面對於用戶來說，在海事無線電通訊系統及SDR之間，可以根據自己的需求考量在軟硬體維護之間取得一個平衡，二者可以並行不悖，財務面則是比較海事無線電通訊系統與SDR射頻設備的價格，當不同通訊模式都可以用軟體來定義的時候，用戶可以大大的減低其成本顯見SDR的價格優勢，因此財務面的評估是可行。本研究評估結果提供給相關用戶及通訊廠商供參考。

This paper is to evaluate the feasibility of introducing software defined radio (SDR) to maritime communication systems. The apparent characteristic of SDR is re-configurable and flexible to process signals by software rather than traditional hardware components. Besides, SDR devices can cover a wide range of frequency in which most of the maritime communication systems can be used.

There are many kinds of maritime communication systems. One of them is automatic identification system (AIS). AIS can exchange data based on ship-to-ship and ship-to-shore facilities using two main channels 161.975 MHz and 162.025 MHz. This study attempts to implement SDR-based AIS platform for receiving actual signals from ships in harbor.

To study the feasibility of using SDR, we constructed an evaluation model that includes four factors: technique, legal and regulatory, maintenance and repair, the actual price of the device as well. These four topics are used to compare SDR with traditional maritime communication facilities and to analyze their strengths and weaknesses.

Consequently, the technical standards for SDR have been specified by the IEEE and ETSI. Since the SDR can reconfigure communication system by software, this advantage makes it easy to maintain a communication system. Also, SDR devices are cheaper than traditional hardware devices. However, the potential interference from SDR has not been solved by the current domestic regulatory department.

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