A ranging precision calibration method, ranging device and system

By acquiring the leading and trailing edge times of the echo signal from the laser rangefinder and combining them with the pulse width threshold, a segmented calibration method for ranging solves the problems of low ranging accuracy and complex calibration in existing technologies, achieving high-precision and simple ranging calibration.

CN122131281APending Publication Date: 2026-06-02HANGZHOU RUIMENG TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU RUIMENG TECH
Filing Date
2026-03-18
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing laser rangefinders suffer from low measurement accuracy, complex and time-consuming calibration processes, and require obstruction or attenuation of the transmitting or receiving ends, resulting in calibration results that cannot accurately reflect actual performance.

Method used

By acquiring the leading edge and trailing edge times of the echo signal, and based on the relationship between the echo pulse width and the pulse width threshold, the target interval time is determined, and then the measurement distance is calculated. A segmented calibration method is adopted to avoid using multiple standard reflectors and simplify the calibration process.

Benefits of technology

It improves ranging accuracy, simplifies the calibration process, reduces calibration costs, ensures the accuracy and real-time nature of calibration results, and overcomes the problem of excessively large distance values ​​caused by the pulse width midpoint as the reference in existing technologies.

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Abstract

This application discloses a ranging accuracy calibration method, ranging device, and system, applied in the field of laser ranging. The method includes: sending a laser pulse to the object being measured and receiving the echo signal; acquiring the leading edge time, trailing edge time, and corresponding echo pulse width of the echo signal; determining the target interval time based on the relationship between the echo pulse width and a pulse width threshold, according to the leading edge time and the pulse width threshold / echo pulse width; and finally determining the measured distance. Therefore, this application can determine whether the current echo signal is saturated based on the relationship between the echo pulse width and the pulse width threshold, and thus determine the target interval time based on the echo pulse width or the pulse width threshold. This segmented calibration method overcomes the problem of overestimating the distance value caused by using the middle value of the pulse width as a reference, improving calibration accuracy. Furthermore, it does not require any obstruction or attenuation design of the device, and the setting of the pulse width threshold makes the calibration process simpler, more reliable, and easier to operate.
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