Four-Channel Ultrasonic Receiver

Abstract

A four-channel ultrasonic receiver is implemented. All four channels utilize a traditional superheterodyne design. Each channel will be capable of receiving and downconverting signals with frequencies from 30 kHz to 50 kHz. The system is capable of receiving four different continuous wave (CW) ultrasonic signals simultaneously. One application for this multichannel ultrasonic receiver involves analyzing the digitally sampled signals from an array of four ultrasonic microphones to perform triangulation to obtain the receiver's position in three-dimensional space. The receiver has a programmable local oscillator, programmable amplifiers, and a customizable low-pass filter option. The customized printed circuit board connects as a daughter board to an Arduino Due. The analog-to-digital converter (ADC) of the Arduino Due can sample data from each channel through a USB interface.