A navigation trajectory correction scheme based on improved Rapidly-exploring Random Tree (RRT) algorithm isproposed to address the issue of actual trajectory deviation in indoor car navigation based on pseudo satellites.In the trajectorycorrection scheme, Software Defined Radio (SDR) is used to collect and modulate the original remote control signals of the car,obtaining signals that can control the car ； And an improved RRT algorithm is added to the correction program to plan the trajectoryof the car when it deviates, thereby achieving the correction of the car trajectory.The results show that this scheme reduces thetrajectory deviation of the car during pseudo satellite navigation, and the correction effect is significant.