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深空通信中高动态多普勒的联合检测算法

DOI: 10.13190/j.jbupt.2015.04.002, PP. 6-9

Keywords: 深空通信,低信噪比,高动态多普勒,捕获概率,联合检测

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Abstract:

针对深空通信中的低信噪比环境,提出了一种高动态多普勒频偏捕获的联合检测算法.利用3个码元累积周期来缩小搜索范围,从而提高多普勒频偏的捕获概率.为了得到捕获概率增量的闭式表达式,研究了搜索范围对捕获概率的影响.理论分析和仿真结果表明,在同时存在极低信噪比和高动态多普勒频偏的条件下,该算法能有效地提高捕获概率和减小捕获误差.

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