基于TOA非相干检测UWB测距系统的性能分析

Performance analysis in UWB positioning systems based on TOA non-coherent detector

鉴于非相干CRB对于分析非相干TOA性能有很大参考价值,将UWB测距系统中接收端信号经过平方律后进行包络检波所得的信号拟合成指数衰减的曲线,利用最大似然估计推导出非相干检测的CRB,并利用TC、MES算法验证其正确性。对影响TOA性能的非相干检测参数进行了分析,得出积分窗口的选取必须在TOA性能和算法收敛速度上进行折衷的结论。提出了一种新的分析信道时延扩展对CRB影响的方法,最后得出结论CRB随着时延扩展的增大而增大。

Due to non-coherent CRB have great referenced worth to analyze TOA performance,and then receive signal after square and envelope detector is curved fit to exponential decay,with ML algorithm,the CRB of non-coherent detector is deduced,which is validated with TC,MES algorithm.The integration window of non-coherent detector parameter influence on TOA performance is studied,and arrive at a conclusion integration window should tradeoff between TOA performance and algorithm rate.A new method in analysis CRB relate with RMS delay spread is proposed, finally the conclusion that CRB increase when RMS delay spread enhance is available.