多径信号到达角和时延高分辨联合估计算法

本文提出了一种新的高分辨高精度的多径信号到达角和时延联合估计算法.该方法通过对多径信号与参考信号进行相关处理,再根据PRO-ESPRIT算法的思想,实现了DOA(Direction-Of-Arrival)估计;并对相关延迟向量进行变换,从互功率谱相位中提取时延信息,完成了高分辨的TOA(Time-Of-Arrival)估计.最后,本文推导了频域模型下到达角和时延联合估计的Cramer-Rao下界.并将通过仿真对本算法的性能进行了评估.

High Resolution Algorithm of Joint DOA and TOA Estimation for Multi-Path Signals

A new high resolution and high precision algorithm is proposed for joint DOA and TOA estimation of multi-path signals.In this method,using the correlation of multi-path signals and referenced signals,the estimation of DOA is realized with the PRO-ESPRIT technique.And the vector of correlation time delay is transformed to extract the time delay information from cross-power-spectrum phase(CSP),thus,the high resolution estimation of TOA is obtained.At last,the simply equation is derived to replace the complex procedure.The proposed approach can obtain the fractional time-delay due to estimating without searching in the certain steps.Therefore,it exhibits the faster speed than the methods with time-delay searching.Finally,the Cramer-Rao lower bound of joint DOA and TOA estimation for frequency model is derived and the performance of this method is evaluated through computer simulation.