Ultrasonic distance measurement is based on the determination of the time of flight of ultrasonic wave. The pulse compression technique that obtains the cross-correlation function between the received signal and the reference signal is used to improve the resolution of distance measurement. The cross-correlation method requires the high-cost digital signal processing. This paper presents the cross-correlation method using delta-sigma modulated single-bit digital signal. Proposed sensor signal processing is composed of the cross-correlation between two single-bit signals and post-moving average filter allows reducing the cost of digital signal processing.
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