摘要： In recent years, indoor localization based on Ultra-Wide Band (UWB) system has been widely utilized due to its high precision and stability. However, Non-line-of-sight (NLOS) propagation is still one of the biggest problems for it can severely degrade the reliability of communication and localization accuracy. In this paper, we take advantage of NLOS and mainly focus on the target detection based on the ranging results of UWB device caused by NLOS. Therefore, some obstacle ranging experiments are designed and carried out by using the UWB equipment, such as a concrete obstacle moving between two ranging nodes, or passing through two ranging nodes, etc. And the ranging results due to the NLOS propagation are exhibited by deriving experimental results from real indoor environment. Then, the ranging results caused by NLOS are analyzed along with the obstacle moving. And the experimental results indicate that the moving obstacle can have a regular impact on NLOS ranging results for UWB system. Moreover, some strategies and methods are proposed to mitigate the NLOS error for UWB systems based on the experiments.