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Two-way laser link over interplanetary distance.

David E Smith1, Maria T Zuber, Xiaoli Sun

  • 1Solar System Exploration Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA. dsmith@tharsis.gsfc.nasa.gov

Science (New York, N.Y.)
|January 10, 2006
PubMed
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Scientists achieved precise laser communication over 24 million kilometers using the Mercury Laser Altimeter (MLA) on the MESSENGER spacecraft. This interplanetary experiment set a new record for laser detection distance.

Area of Science:

  • Planetary Science
  • Optical Physics
  • Space Geodesy

Background:

  • Laser ranging is crucial for precise measurements in space missions.
  • Interplanetary distances pose significant challenges for laser communication.
  • The MESSENGER mission aimed to study Mercury's surface and environment.

Purpose of the Study:

  • To demonstrate and record timed laser observations between a spacecraft and ground station at an interplanetary distance.
  • To achieve a two-way laser link for precise ranging and data acquisition.
  • To establish a new distance record for laser detection.

Main Methods:

  • Utilized the Mercury Laser Altimeter (MLA) aboard the MESSENGER spacecraft.
  • Conducted timed observations with subnanosecond precision.

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  • Employed precise standard ground timing at the NASA Goddard Geophysical and Astronomical Observatory (GGAO).

    • Main Results:

    • Successfully performed 40 MLA downlink and 90 uplink observations.
    • Achieved laser detection at a distance of nearly 24 million kilometers.
    • Enabled precise solutions for spacecraft range, range rate, acceleration, and clock bias.

    Conclusions:

    • The experiment established a new world record for laser detection distance.
    • A successful two-way laser link was accomplished at an interplanetary distance.
    • Demonstrated the feasibility of high-precision laser ranging for deep space missions.