中文摘要：

DS—UWB系统是否能够获得快速可靠的信号同步是系统设计的一项重要指标。该文在最大值选择／过门限（MAXimum selection／Threshold Comparison，MAX／TC）准则DS—UWB系统同步捕获算法的基础上，提出一种采用辅助序列的MAX／TC准则改进型同步捕获算法，算法利用辅助序列信息判断本地伪随机序列发生器相位更新方向，能够较大程度降低系统伪随机序列同步捕获时间；通过对改进算法进行较为详细的理论分析，并且在超宽带室内信道环境中进行仿真实验，结果表明，采用该文算法可以在保证系统同步捕获性能的同时有效缩短平均同步捕获时间。

英文摘要：

The code acquisition is an important issue of DS-UWB system design. Because the MAXimum selection/Threshold Comparison（MAX/TC） criterion for code acquisition has good performance in DS-UWB system, in this paper, a MAX/TC criterion for code acquisition algorithm using the information of the auxiliary sequence, which can be used to reduce the acquisition time of the coarse Pseudo-Noise （PN） sequences, is presented. Then the theoretical analysis is given and simulation tests of proposed acquisition algorithm are carried out in UWB indoor channel environment. The simulation results show that with the proposed algorithm, the mean acquisition time can be reduced considerably while the acquisition performance is maintained.