A navigation trajectory correction scheme based on improved RRT algorithm is proposed to address the issue of actual trajectory deviation in indoor car navigation based on pseudo satellites. In the trajectory correction scheme, software radio SDR software 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 trajectory of the car when it deviates, thereby achieving the correction of the car trajectory. The results show that this scheme reduces the trajectory deviation of the car during pseudosatellite navigation, and the correction effect is significant.