Two step UWB TOA estimation method for WSN ranging
适合WSN的超宽带两步TOA估计算法

Jointing energy detection and match-filter method can speed up the estimation process and perform accurate estimation. In first step,obtained a rough TOA by non-coherent low-rate energy samples. Then, in the second step,estimated a precise TOA of the direct-path (DP)by correlation match-filter within energy sample periods obtained in anterior step. In proposed algorithm,the parameters such as energy sample period and normalized thresholds play important role.So,discussed and modeled their effects based on maximum-to-minimum energy ratio and noise statistics. Simulation results in IEEE 802.15.4a channel demonstrate that the proposed method outperforms the non-coherent energy-detection method, and decreases the computation-quantity comparing to match-filter. So, the proposed method is more appreciate to WSN node.