一种变步长超宽带同步捕获的方法

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同步捕获的方法。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。本文对该算法的平均捕获时间进行性能分析，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，采用平均捕获时间和捕获精度作为衡量标准。

A Variable Step Synchronization Acquisition Scheme for UWB System

The extremely narrow pulse at the order of nanoseconds and multipath in Time Hopping UWB system result in long mean acquisition time(MAT) and low acquisition precision. A novel Variable Step Acquisition (VSA) scheme, which aims to improve MAT and acquisition precision, is proposed. The proposed scheme acquisition employs nonconsecutive search and variably adjusts searching steps according to several thresholds, which makes the acquisition process a fast acquisition with variable steps, i.e., from coarse steps to refined one. The MAT performances of the proposed scheme and conventional acquisition schemes are evaluated and compared. It is found that the proposed acquisition scheme significantly outperforms the conventional one.