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中文摘要：
针对跳时超宽带系统中多径和窄脉冲引起的平均捕获时间长、捕获精度低等问题，提出一种用于改进平均捕获时间和捕获精度的变步长的同步捕获方法．算法采用非连续搜索并利用多个门限有效调整搜索步长，整个搜索过程遵循由粗到精的快速搜索策略．文中还对该算法的平均捕获时间进行了分析，并在基于脉冲体制的跳时超宽带系统仿真中将其与经典算法进行比较．仿真结果表明，相比于其他经典算法，变步长算法的捕获策略极大地减少了平均捕获时间，提高了捕获精度．
英文摘要：
In order to overcome the long mean acquisition time （MAT） and the low acquisition precision resulting from the multipath narrow pulse in the time-hopping ultra-wide band （UWB） system, a synchronization acquisition scheme with variable step size is proposed. In this scheme, the nonconsecutive search and various thresholds are employed to effectively adjust the searching step size, and the searching process follows the steps from coarse to re- fined. The MAT performances of the proposed scheme are then analyzed and compared with those of the conventional acquisition schemes via a simulation of a pulse-based time-hopping UWB system. The results indicate that, as compared with the conventional schemes, the proposed acquisition scheme significantly saves the MAT and improves the acquisition precision.
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