Collaborative Phase-Shift Laser Ranging for Ultra-Long Precision Measurement
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Solution Overview
Problem
Existing laser ranging technologies face limitations in achieving ultra-long distance measurement with submillimeter-grade or micron-grade accuracy due to sharp attenuation of return laser energy and low signal-to-noise ratio, narrow modulation bandwidth, and insufficient detection capabilities of high-frequency gauge signals, which hinder precise distance measurement in large-scale applications.
Innovation Solution
A collaborative phase-shift laser ranging device utilizing differential modulation and demodulation of coarse and precise measuring wavelengths, involving a measuring terminal and collaboration terminal, with multi-frequency generation, electro-optical modulation, and photoelectric detection to enhance signal amplification and phase detection accuracy, enabling frequencies from tens of MHz to tens of GHz, and real-time compensation of environmental phase variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser power is increased to improve signal-to-noise ratio for ultra-long distance measurement, then measurement range is extended, but system complexity and safety requirements increase
Solution Approach 1:
The patent changes the modulation frequency parameter from conventional low frequencies to ultra-high frequencies (tens of GHz), which fundamentally alters the signal characteristics and enables long-distance measurement without increasing laser power. This parameter transformation resolves the contradiction by improving signal-to-noise ratio through frequency-domain optimization rather than power-domain increases.
Solution Approach 2:
The patent replaces conventional mechanical/electronic modulation methods with electro-optical modulation at ultra-high frequencies. This substitution enables more efficient signal encoding and transmission, improving measurement precision without proportionally increasing system complexity.
2Measurement precision
If modulation bandwidth is increased to support high-frequency gauge signals, then measurement accuracy is improved, but detection capability becomes insufficient
Solution Approach 1:
The patent transitions from temporal-domain signal processing to frequency-domain processing by utilizing ultra-high frequency modulation. This dimensional change in signal processing approach enables the system to achieve high measurement accuracy while working within existing detection capabilities, as the information is encoded in the frequency domain rather than requiring ultra-fast temporal resolution.
3Measurement precision
If laser power is increased to maintain signal-to-noise ratio, then measurement accuracy is maintained, but safety and system complexity increase
Solution Approach 1:
The patent fundamentally changes the operating frequency parameter to ultra-high frequencies (tens of GHz), which allows the system to achieve high measurement accuracy through frequency-domain signal processing rather than power-domain amplification. This parameter transformation maintains measurement precision while eliminating the need for high laser power, thereby resolving the safety contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves submillimeter-grade to micron-grade accuracy over ultra-long distances without increasing laser power, breaking bandwidth limitations and improving signal-to-noise ratio, thus meeting the demands of large-scale and high-precision measurement requirements.
Implementation Method 1
electro-optical modulation, and photoelectric detection to enhance signal amplification and phase detection accuracy
Implementation Method 2
electro-optical modulation, and photoelectric detection to enhance signal amplification and phase detection accuracy
Implementation Method 3
A collaborative phase-shift laser ranging device utilizing differential modulation and demodulation of coarse and precise measuring wavelengths
Implementation Method 4
collaborative phase-shift laser ranging device based on differential modulation and demodulation of coarse and precise measuring wavelength
Data Source
AI summary
The present disclosure relates to a collaborative phase-shift laser ranging device based on differential modulation and demodulation of coarse and precise measuring wavelength and a ranging method thereof. A collaboration terminal is disposed at a target to be measured of a phase-shift laser ranging system, which can improve the intensity of measurement light and then irradiate the same back to a measuring terminal, thereby resolving the problem of low ranging accuracy caused by the attenuation of light intensity during long-distance ranging. The collaboration terminal detects coarseness gauge signals and modulates a laser source by means of differential modulation; the collaboration terminal detects precision gauge signals by means of difference frequency demodulation, and then the intensity of measurement light is improved by mixing and restoring the precision gauge signals and modulating the collaboration-terminal laser source.