衛星導航信號仿真系統是一個實時性要求很高的射頻信號仿真系統，它主要模擬包含多種信息的高精度射頻信號。首先介紹了衛星導航信號仿真系統，與一般的仿真系統相比，它具有三個特點；接著對影響仿真系統實時性的仿真步長、時間函數及網絡數據傳輸等幾個因素進行了分析；最后詳細地對影響系統實時性的幀溢出數、時間同步精確度等四個指標進行了驗證。分析與驗證的結果表明：該仿真系統具有很高的實時性，能夠滿足系統實時仿真的要求。
關鍵詞：衛星導航信號仿真；實時仿真；實時性；驗證

Real-time Analysis and Validation for Satellite Navigation Signal Simulation System
YANG Hai-gang，TANG Jian-bing，ZHENG Li-feng (College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China) Abstract: The satellite navigation signal simulation system is a frequency signal one，which simulates the signal of high precision and consisted of diverse information. Firstly, the satellite navigation signal simulation system is introduced; it takes on three characteristics, comparing to generic simulation system. Secondly, several elements such as simulation steptime, time function and network data transfers, which affected real-time quality of simulation system are analyzed. Finally, four real-time quality indexes such as frame overflow, time synchronization etc are validated in detail. By analyzing and validating, the result shows that the simulation system possessing higher real-time quality and it can meet the requirement of real-time simulation for the system.
Key words: Satellite Navigation Signal Simulation; Real-time Simulation; Real-time quality; Validation