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中文摘要：
摘要：系统时间同步是宽带分布式全相参雷达的核心问题之一，但现有的时间同步技术无法满足其同步精度需求．本研究基于频率步进信号提出了一种宽带分布式全相参雷达时间同步方法．分析了时间同步误差对系统相参性能的影响；提出了采用频率步进信号代替线性调频信号的时间同步方法．理论分析表明，该方法能够极大地减小时间同步误差对相参性能的影响，进而降低对时间同步精度的需求；通过仿真分析验证了本方法的有效性．
英文摘要：
The time synchronization is the key issue of wideband distributed coherent aperture radar. However, current time synchronization technology could not meet the requirement of high accuracy of time synchronization for wideband distributed coherent aperture radar. In this paper, a time synchronization method based on step frequency signal was proposed. Firstly, the impact of time synchronization error on coherent performance was investigated. And then, a time synchronization method by using step frequency signal to replace linear frequency modulated signal was proposed. According to theoretical analysis, the effect of time synchronization error on coherent performance was reduced in our proposed method, which reduced the requirement of time synchronization accuracy into a realizable level. At last, the effectiveness of proposed method was verified by simulations.
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