IR-UWB测距中NLOS状态的鉴别

吴绍华; 张钦宇; 张乃通

doi:10.3724/SP.J.1146.2007.01812

IR-UWB测距中NLOS状态的鉴别

doi: 10.3724/SP.J.1146.2007.01812

吴绍华^{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)资助课题

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出版历程
- 收稿日期: 2007-11-26
- 修回日期: 2008-06-26
- 刊出日期: 2008-11-19

NLOS Identification for IR-UWB Ranging Systems

Wu Shao-Hua^{①② 张钦宇
,},
Zhang Qin-Yu,
Zhang Nai-Tong

摘要

摘要: NLOS效应是IR-UWB测距定位系统中影响精度的主要因素之一。该文提出不依赖于信道估计，直接从接收信号采样序列中提取特征参量进行NLOS鉴别的方法，构造了采样序列的首均比与峰均比乘积作为鉴别参量，并与使用峭度和平均附加时延这两个参量的鉴别性能进行了对比。仿真结果表明：相干测距所对应的鉴别性能要好于非相干测距，原因是更为精确的DP检测结果及高采样速率使得参量提取值更能准确地反映信道状态信息；使用峭度和平均附加时延作为鉴别参量所能获得鉴别性能均不理想，而使用采样序列的首均比与峰均比乘积能使鉴别成功率提高10%左右。在定位模块中融入该文所获得的NLOS的鉴别结果将有助于定位精度的进一步提升。
- IR-UWB /
- 测距 /
- 定位 /
- NLOS鉴别
Abstract: NLOS propagation is a main source of ranging error for IR-UWB localization systems. To mitigate the NLOS effects, a NLOS identification method which do not need accurate channel estimation process is proposed in this paper. Metrics are directly extracted from the received signal samples to identify the channel state. In this paper, product of DP-to-average and peak-to-average is constructed as the identification metric, whose performance is compared to conventional metrics including kurtosis and the mean excess delay. Simulation results show that performance corresponding to coherent ranging is better than that corresponding to non-coherent ranging, which is mainly due to the more accurate DP detection results and the higher sampling rate of coherent ranging. Performance comparison demonstrates that both kurtosis and the mean excess delay cannot obtain satisfying results, while using the product of DP-to-average and peak-to-average can increase the identification success ratio nearly 10 percent. Localization accuracy is expected to be improved by incorporating the NLOS identification results into the positioning module.
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参考文献(1)

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