Abstract: Dead reckoning is the most common pedestrian navigation of a projection algorithm. This paper analyzed the traditional dead reckoning.The dead reckoning for pedestrian navigation which has a fixed threshold can not be different according to the pedestrian environment and can not automatically adjust the threshold value,which leads to Lower accuracy. Therefore this paper proposed the radar-based multi-level threshold dead reckoning that is RMLT DR algorithm. Through simulation experiments,comparcd RMLT DR algorithm and dead reckoning positioning. During pedestrians walking,RMLT DR algorithm can automatically select the threshold size according to the surrounding environment with higher accuracy.

Key words: Dead reckoning,Multi-level threshold,RMI_T DR algorithm,Pedestrian navigation