Correction method and device for ultrasonic distance measurement and ultrasonic receiving device

Abstract

The invention discloses a correction method and device for ultrasonic distance measurement and an ultrasonic receiving device. The correction method comprises the following steps: determining the positioning distance of an ultrasonic receiving device in a second period according to the moving speed and acceleration of the ultrasonic receiving device and the ultrasonic measurement distance betweenthe ultrasonic receiving device and an ultrasonic transmitting device in a first period; determining the ultrasonic measurement distance between the ultrasonic receiving device and the ultrasonic transmitting device in the second period; and correcting the ultrasonic measurement distance between the ultrasonic receiving device and the ultrasonic transmitting device in the second period according to the result of comparison between the ultrasonic measurement distance and the positioning distance of the ultrasonic receiving device in the second period, wherein the second period is a signal period next to the first period. Thus, the error of ultrasonic distance measurement is reduced, and the accuracy of measurement is improved.

Description

technical field [0001] The present application relates to but not limited to ultrasonic technology, in particular to a correction method and device for ultrasonic distance measurement, and an ultrasonic receiving device. Background technique [0002] Ultrasound is a part of the sound wave, which is inaudible to the human ear and has a frequency higher than 20KHZ (kilohertz); the propagation of ultrasonic waves has the characteristics of strong directivity, slow energy consumption, and long propagation distance in the medium, so ultrasonic waves are often used in distance measurement. [0003] An implementation of ultrasonic ranging includes an ultrasonic transmitter and an ultrasonic receiver, and the difference between the time when the ultrasonic receiver receives the ultrasonic signal and the time when the ultrasonic transmitter sends the ultrasonic signal is multiplied by the propagation speed of the ultrasonic signal to obtain Distance between ultrasonic transmitter an...

AI Technical Summary

Problems solved by technology

[0005] However, due to the reflection characteristics of ultrasonic waves, the reflected ultrasonic signals may be received by some or all of the ultrasonic receivers installed on the equipment to be positioned, thus affecting the accuracy of ultrasonic ranging

For example, if figure 1 As shown, in a small space, due to the reflection characteristics of ultrasonic waves, when encountering obstacles such as walls or objects, the reflected ultrasonic signals may be received by multiple ultrasonic receivers installed on the equipment to be positioned. , the device to be positioned uses ultrasonic waves to measure distance, and there will be errors, which will affect the accuracy of distance measurement

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