High-Precision Ultrasonic Ranging System Platform Based on Peak-Detected Self-Interference Technique

A high-precision ultrasonic ranging system platform is presented and evaluated in this work. By queuing peaks of the self-destructive interference, the proposed hardware platform can enhance the accuracy without complex algorithms. At the emitter, the developed technique generates two amplitude-modulated pulses with 180° phase shift. At the receiver, on the other hand, the two pulses create a self-destructive interference. This interference waveform can be used to directly determine the time of flight. By implementing the developed technique on a low-cost microcontroller platform, the experimental result shows the accuracy with 0.06 mm over a range of 50-1000 mm. Moreover, the system accuracy remains 0.15 mm within the range of 2000 mm. The developed system establishes an effective method for low-cost and high-performance ranging systems.