Ultrasonic distance measurement with the pulse-echo method is based upon the determination of the time of flight of ultrasonic waves. The pulse-compression technique, which involves the calculation of the cross–correlation function between the transmitted and the reflected waves, is the conventional method for improving
the resolution of the measurement. The calculation of a cross-correlation operation requires high-cost digital signal processing, however. A new sensor signal processing method of the pulse-compression technique using a delta-sigma modulated single-bit digital signal has been proposed. The proposed method consists of a cross-correlation operation by single-bit signal processing, and a smoothing operation accomplished by a moving average filter. For the pulse-compression technique, this method reduces the calculation cost of digital signal processing. In this paper,
cross-correlation by single-bit signal processing has been evaluated by experiment of ultrasonic distance measurement.