Abstract
针对深空通信系统中编码和导频辅助载波同步算法分别存在同步范围与精度受限的问题，该文提出一种基于编码与导频联合辅助的载波同步算法。首先按照最优导频放置方式设计了一种基于相关函数和的粗同步算法，其频率估计量的精度接近CRB界；然后分析了导频结构对算法估计精度与范围的影响机理；接着通过加入导频及频率积分器的方式对基于期望最大的细同步算法进行了改进；最后用码率为1/12的低码率LDPC-Hadamard码对算法进行了仿真验证。结果表明新算法可以大幅提高同步参数的估计范围与精度，在一定的导频长度下能达到理想同步。
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