Sensor Signal Processing for Ultrasonic Sensors Using Delta–Sigma Modulated Single-Bit Digital Signal
Ultrasonic distance measurement is based on determining 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 high-cost digital signal processing. This paper presents a cross-correlation method using a delta–sigma modulated single-bit digital signal. Sensor signal processing composed of the cross-correlation between two single-bit signals and a post-moving average filter is proposed and enables reducing the cost of digital signal processing.
Key wordsUltrasonic distance measurement Pulse compression technique Delta–sigma modulation Cross-correlation Moving average filter
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