中文摘要：

针对TDDM技术而引发的卫星导航信号捕获难的问题,在深入研究与分析现有方法的不足与缺陷的基础上,提出了一种3SDA算法。在3SDA算法的合路快捕阶段,可以快速搜索误差,而且可以弥补TDDM引发的漏捕现象;在正负并行精捕阶段,可以缩小数据信息反转位的判决误差;在χ-λ模糊判决阶段,通过χ系数判决、λ分块调整等处理手段,可以精确地判断数据信息反转位置。进一步从捕获精度、处理复杂度角度进行了验证与分析,从而验证了3SDA算法的有效性,不但可以合理高效地达到捕获的目的,而且可以使数据信息反转位的判决精度可达99%,相关处理效率的提高率大于90%。

英文摘要：

In light of the difficulty of satellite navigation signal acquisition processing raised by the TDDM technique,a new 3SDA algorithm based on TDDM signal is proposed on the basis of analysis for the shortage of existing algorithms.The error is quickly searched by united-channels-based fast acquisition of 3SDA algorithm,and the phenomenon of leaked acquisition caused by TDDM is remedied.The error output of data is reduced through positive and negative parallel precise acquisition.The precise reversed position of data is outputted by χ coefficient judge and λ adjustment in the χ-λ illegible judge phase.From acquisition accuracy and complexity,the validity of 3SDA algorithm is proved.Not only the reasonable and effective purpose can been achieved,but also the judgment accuracy of data reversal can reach 99%,and the processing efficiency is higher than 90%.