一种基于能量加权检测的UWB测距方法

张霆廷; 张钦宇; 张乃通

doi:10.3724/SP.J.1146.2008.01120

一种基于能量加权检测的UWB测距方法

doi: 10.3724/SP.J.1146.2008.01120

张霆廷^{①②;张钦宇},
张钦宇,
张乃通

基金项目:

国家自然科学基金重点项目(60432040)和国家自然科学基金项目(60702034)资助课题

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出版历程
- 收稿日期: 2008-09-09
- 修回日期: 2009-04-20
- 刊出日期: 2009-08-19

A UWB Ranging Method Based on Weighted Energy Detection

摘要

摘要: 针对无线传感器网络节点低成本、低运算能力的特点，该文为基于超宽带(UWB)的无线传感器网络提出了一种基于能量加权的到达时间(TOA)估计方法。这种方法由直达径(DP)能量窗加权检测和DP在能量窗内位置精确估计两部分组成。文中给出了DP能量块检测概率和估计结果的闭合表达式，通过理论和数值分析了积分长度，子能量块个数等系统参数对于TOA估计性能的影响。通过仿真结果进行了性能比较和误差分析，结果表明，该算法在保持能量检测方法低采样率特点的同时，在性能上相对传统算法有了较大提升。
- 脉冲超宽带;能量检测;测距;到达时间估计
Abstract: In order to design a low-computational Time Of Arrival (TOA) estimation algorithm for the Ultra WideBand (UWB) based wireless sensor network, a new TOA estimation method which focuses on the Direct Path (DP) component based on weighted energy detection is proposed in this paper. This method includes two steps, one is DP energy block detection, and the other is the refined DP estimation. A closed form for performance analysis is proposed, and system parameters that affect estimation performance are studied with analytical and numerical methods. The results compared with traditional ranging methods also show that this method can achieve relative high performance under low sample rate conditions.

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