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  3. The Laser Rangefinder System In Quadrature Modem And Ambiguity Resolution.
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  3. The Laser Rangefinder System In Quadrature Modem And Ambiguity Resolution.

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The Laser Rangefinder System in Quadrature Modem and Ambiguity Resolution.

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    Summary
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    A new laser rangefinder system uses quadrature modem amplitude modulation for improved accuracy and simpler design. It resolves range ambiguity effectively, achieving high precision and speed for reliable distance measurements.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Signal Processing

    Background:

    • Traditional laser rangefinder systems often face challenges with measurement accuracy and hardware complexity.
    • Secondary mixing methods can introduce inaccuracies and design complications in phase measurement.
    • Range ambiguity is a common issue in distance measurement processes.

    Purpose of the Study:

    • To develop an advanced laser rangefinder system utilizing quadrature modem amplitude modulation.
    • To enhance phase measurement accuracy and simplify hardware design.
    • To introduce a novel algorithm for resolving range ambiguity without optimal solution searching.

    Main Methods:

    • Implementation of a quadrature modem for amplitude modulation in the laser rangefinder.
  • Development of a ranging ambiguity resolving algorithm based on over-determined equations.
  • Experimental validation using three proposed rangefinders and two K60 laser rangefinders on a national standard baseline.

    • Main Results:

    • Achieved a precision of 0.18 mm in experiments on a national standard baseline.
    • Demonstrated a measuring time of less than 1.8 seconds.
    • Exhibited an average measuring error of less than 2 mm and a standard deviation of less than 1 mm within a 0-60 m range.

    Conclusions:

    • The proposed laser rangefinder system offers superior measurement accuracy and speed compared to traditional methods.
    • The novel ambiguity resolving algorithm effectively eliminates the need for optimal solution searching.
    • The system demonstrates high reliability and practical applicability for precise distance measurements.