Microwave-based high-precision absolute distance measurement system and method

CN116359895BActive Publication Date: 2026-06-23ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2023-02-16
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing ranging methods are insufficient in terms of accuracy and environmental adaptability. In particular, laser ranging is easily affected by weather, infrared ranging has limited accuracy, and ultrasonic ranging has insufficient range and accuracy. There is a lack of high-precision, environmentally unaffected fixed-point absolute distance measurement methods.

Method used

A high-precision absolute distance measurement system based on microwave is adopted. It utilizes a two-way transmission architecture combined with frequency conversion technology. Through time synchronization and frequency change of the ranging master and slave boards, high-precision absolute distance measurement is achieved. An ultra-stable crystal oscillator board is used to eliminate the influence of frequency drift noise. The hardware structure of the ranging master and slave boards is basically the same to avoid co-frequency interference.

Benefits of technology

It achieves sub-millimeter accuracy in distance measurements up to 100 meters, increases the upper limit of the ranging range, reduces manufacturing costs and complexity, and improves system compatibility and measurement accuracy.

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Abstract

The application discloses a kind of high-precision absolute distance measurement system and method based on microwave, for high-precision distance measurement between two fixed points in field, the measurement system adopts the combination of frequency conversion method and double-path transmitting and receiving distance measurement architecture, high-precision phase measurement data is obtained using high-frequency double-path transmitting and receiving architecture, and the method of continuous frequency conversion in frequency range is used to fix ambiguity, and then the final absolute distance measurement result is obtained.After the overall system is realized by hardware, function measurement is carried out.After multiple hardware measurements, the high-precision fixed-point absolute distance measurement system based on microwave of the application reaches sub-millimeter level measurement accuracy in hundred-meter level distance measurement, and the optimal error can reach 0.1 millimeter.
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