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Related Concept Videos

Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...
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Monocular kilometer-scale passive ranging by point-spread function engineering.

Nadav Opatovski, Dafei Xiao, Gal Harari

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    |October 19, 2022
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    Summary
    This summary is machine-generated.

    This study introduces a novel passive ranging method using telescopes and point-spread-function engineering for long-range distance estimation. The system successfully measured distances over 1.7 km in challenging conditions without active signal emission.

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    Area of Science:

    • Optical Engineering
    • Remote Sensing
    • Computer Vision

    Background:

    • Standard imaging systems capture 2D data, making 3D distance estimation difficult.
    • Current long-range distance estimation relies on active systems, increasing complexity, size, and cost.
    • Passive distance estimation methods are limited to short ranges, with few options beyond a few hundred meters.

    Purpose of the Study:

    • To develop a monocular, telescope-based passive ranging system for long-range distance estimation.
    • To extend the application of point-spread-function engineering to unprecedented distances.
    • To demonstrate the system's effectiveness in diverse and challenging imaging scenarios.

    Main Methods:

    • Integration of point-spread-function engineering with a telescope.
    • Development of a monocular passive ranging system.
    • Experimental validation in various conditions, including adverse weather and dynamic targets.

    Main Results:

    • Successful passive distance estimation beyond 1.7 kilometers.
    • Demonstration across challenging scenarios: adverse weather, dynamic targets, and varied textures.
    • Quantification of atmospheric turbulence as a significant error source in long-range optical imaging.

    Conclusions:

    • Monocular, telescope-based passive ranging is feasible for long distances.
    • Point-spread-function engineering can be effectively scaled for long-range applications.
    • Atmospheric turbulence is a key factor affecting precision in passive long-range optical imaging.