Ultrasonic based dynamic distance measurement method and system

Abstract

The invention discloses ultrasonic based dynamic distance measurement method and system, belonging to the technical field of distance measurement. The dynamic distance measurement method comprises the following steps of: sending ultrasonic signals with different frequency spectrum features to a receiving end from a sending end according to a certain frequency and recoding the frequency spectrum features of the ultrasonic signals; receiving wireless signals returned by the receiving end, wherein the wireless signals are transformed from the ultrasonic signals sent by the sending end after the ultrasonic signals are received by the receiving end; and matching and comparing the frequency spectrum features of the ultrasonic signals loaded in the wireless signals with the frequency spectrum features of the ultrasonic signals recorded by the sending end to obtain time differences, and then calculating and determining the distance between the sending end and the receiving end according to the time differences. The method utilizes an ultrasonic technology and a wireless technology to realize the convenient and accurate measurement of the distance between two points in a simple and easy mode and has the advantages of high measurement efficiency, accurate distant measurement result and continuous dynamic measurement.

Description

technical field [0001] The present invention relates to the technical field of distance measurement, in particular to a method and system for dynamic distance measurement based on ultrasonic waves. Background technique [0002] At present, direct measurement, laser ranging or ultrasonic ranging are mostly used for distance measurement. Among them, laser ranging and ultrasonic ranging are used in more and more ranges. This method mainly realizes distance measurement by emitting laser or ultrasonic waves to the target, and using the echoes of laser and ultrasonic waves to calculate the distance. Since both methods must rely on the echoes, there are at least the following disadvantages: [0003] (1) In the process of continuous movement of the measured object, it is difficult to realize the measurement because the measurement point cannot be aligned; [0004] (2) When the measurement point of the measured object is difficult to reflect the echo, for example, the measurement po...

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Problems solved by technology

[0003] (1) During the continuous movement of the measured object, it is difficult to achieve measurement due to the inability to align the measurement point;

[0004] (2) When the measuring point of the measured object is difficult to reflect the echo, for example, the measuring point is relatively small and difficult to align, or it is difficult to reflect laser or ultrasonic waves due to its physical properties, and the echo is relatively weak, it will be difficult to measure;

[0005] (3) For ultrasonic measurement, due to relying on echoes for measurement, the sound wave transmission path is increased, and it is easily affected by multipath effects to reduce measurement sensitivity and accuracy. In addition, the ultrasonic transmission power of the instrument is relatively high, and the range of distance measurement is also limited. ;

[0006] (4) For ultrasonic measurement, due to the certain diffusion of ultrasonic waves, when there are obstacles within a certain range in front of the measured point, it will cause measurement errors

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