An intelligent car system is designed to locate and track target through ultrasonic sensor.The ultrasonic sensor module is used as the device to collect and transmit the tracking target information.The mathematical model is established.The acquisition of ultrasonic signal is studied according to different array way and emission angles.After verification

the specific angle is selected to achieve acquisition of large area ultrasonic signal.Experiments show that the ultrasonic tracking system can obtain the distance and position information of the target in effective range.The error is very small and the localization is accurate.Pulse width modulation（PWM）control the car to move and track autonomously.The experimental results are further verified by simulation.The experimental results show that the following system operates stably

follow effect is good

and has good accuracy

real-time and intelligence.