In satellite navigation and positioning system , time is important information for fast and direct acquisition of long cycle code , one of its important aspects is the uncertainty compression of signal ' s propagation delay to reduce time search range 摘要衛星導航定位系統中,輔助長碼快捕的一個最重要的信息是時間信息,衛星信號傳播時延估計是提供先驗時間信息,減少時域搜索范圍的一個重要方面。