An Ultrasonic Positioning System for an Assembly-Work Guide

In this research, for an assembly-work guide, an ultrasonic positioning system is proposed to track the positions of an indoor moving object. Composed of an ultrasonic sender (moving object) and a receiver (anchor), the system employs three ultrasonic time-off-flights (TOFs) and trilateration to estimate the positions of the moving object in real time. In addition, to remove measuring noises, a pulse debounce technique and Kalman filter have been applied to the position estimation. Ultrasonic signals are processed in full digital with a Zynq SoC, in which a hardware/software co-design is implemented where digital circuit portion is designed in the Zynq’s fpga and software portion is c-coded in the Zynq’s dual processors by using the bare-metal multiprocessing. According to the test results, it was confirmed that circular motions could be tracked with accuracy of sub-centimeter and the location of a worker’s hand was well tracked.