A compound distance measuring instrument and its distance measuring method

Abstract

The invention provides a composite distance measuring instrument and a distance measuring method thereof. The composite distance measuring instrument comprises a main measuring module and a beacon module with a fixed position, wherein the beacon module comprises a first wireless transceiver module, an ultrasonic emission module and a first intelligent processing module; the main measuring module comprises a second wireless transceiver module, an ultrasonic receiving array and a second intelligent processing module, wherein the second wireless transceiver module is used for contacting with the beacon module in a wireless manner, transceiving a command, transceiving a synchronizing signal and receiving a wireless signal for arranging the receiving timing sequence of ultrasonic wave signals; the ultrasonic receiving array is used for receiving the ultrasonic wave signals sent from the beacon module; the second intelligent processing module is used for processing a received command, recognizing codes, as well as storing and analyzing received ultrasonic wave data information. The invention also comprises another composite distance measuring instrument and two distance measuring methods thereof. Besides filtering acoustic interference in the environment, the instrument and the method thereof, provided by the invention also improve the reliability and the accuracy of distance measuring.

Description

technical field [0001] The invention relates to the technical field of positioning and navigation, in particular to a compound range finder and a range finder method thereof. Background technique [0002] Distance is a parameter that needs to be detected in different occasions and controls, and distance measurement has become a problem to be solved in data collection. At present, the common ranging methods are: laser ranging, radar ranging and ultrasonic ranging. Among them, laser ranging is to use laser to measure the distance of the target. When the laser rangefinder is working, it emits a thin laser beam to the target, and then the photoelectric element receives the laser beam reflected by the target, and the counter in the control circuit measures the time from emission to reception, thereby calculating the distance from the observer to the target. Radar ranging is similar to laser ranging, and its advantage is that the ranging range is large, but the power consumption...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing ultrasonic ranging methods use the reflective ranging method. The advantage is that it is simple, but the positioning accuracy is poor. Usually, it can only judge the presence or absence of objects and the approximate distance, but it is not suitable for accurate positioning, and the accuracy and reliability are very low.

There are very few existing ultrasonic ranging methods that use the direct beam ranging method, but most of the ultrasonic signal detection methods use the threshold judgment method. The disadvantage of this method is that the anti-interference ability is poor. When the sound source is far away from the receiving sensor, the receiving sensor The received ultrasonic signal will have a large attenuation, and it will not reach the set threshold, which will lead to the phenomenon that it cannot be detected.

In addition, the problem that ultrasonic waves are affected by multipath effects and non-line-of-sight propagation has not been solved, making its application range narrow.

[0005] The above problems have always been the main problems restricting the use of ultrasound for positioning, so that the ultrasonic positioning method cannot be applied in a relatively large range

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