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Related Concept Videos

Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...

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Multishot laser altimeter: design and performance.

X Sun, J B Abshire, F M Davidson

    Applied Optics
    |September 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new multishot laser altimeter design extends measurement range by averaging laser shots. This technology enables accurate ranging of icy satellites from 10,000 km, even with low signal levels.

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    Area of Science:

    • Planetary Science
    • Optical Engineering
    • Remote Sensing

    Background:

    • Laser altimeters are crucial for planetary surface mapping.
    • Extending the measurement range of laser altimeters is essential for deep space missions.
    • Single-shot laser altimeters have limitations in range and sensitivity.

    Purpose of the Study:

    • To present the principles of operation and design of a multishot laser altimeter.
    • To demonstrate the enhanced performance of a multishot laser altimeter for spaceborne applications.
    • To evaluate the capability of the multishot laser altimeter for ranging icy satellites near Saturn.

    Main Methods:

    • A multishot laser altimeter utilizing a Si avalanche photodiode detector was designed and analyzed.
    • Performance was evaluated under simulated operating conditions near Saturn.
    • Averaging of 100 laser shots was employed to enhance measurement accuracy and sensitivity.

    Main Results:

    • The multishot laser altimeter demonstrated accurate ranging at distances of 10,000 km from an icy satellite.
    • With 100-shot averages, the minimum detectable signal level was reduced to 9.8 photons per pulse.
    • This represents a significant improvement compared to the 76 photons per pulse required for a single-shot system.

    Conclusions:

    • A multishot laser altimeter design significantly extends measurement range and improves sensitivity.
    • This technology is suitable for accurate ranging of planetary bodies in challenging deep space environments.
    • The multishot approach offers a viable solution for future spaceborne altimetry missions.