Self-driving cars, also known as self-driving car, computer-driven car, or wheeled mobile robot, is a kind of intelligent car that realizes driverless DRIVING through computer system. With decades of history in the 20th century, the beginning of the 21st century shows a trend of near practicality; Self-driving cars rely on the cooperation of artificial intelligence, camera system, radar system, body motion measurement unit (IMU) and satellite positioning system (Beidou or GPS), allowing the computer to operate the vehicle automatically and safely without any active human operation. It’s motion measurement unit and satellite positioning system have high accuracy and excellent zero stability. It provides stable initial position and direction for vehicle body steering and position judgment, and makes it possible for autonomous vehicle to start automatic driving directly from stopping state.