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Astronomical applications of differential interferometry.

C C Counselman, H F Hinteregger, I I Shapiro

    Science (New York, N.Y.)
    |November 10, 1972
    PubMed
    Summary
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    Radio signal intercomparison at multiple sites offers a powerful astrometric tool for precise measurements. This technique enables applications from lunar exploration to planetary atmosphere studies and inertial frame localization.

    Area of Science:

    • Radio astronomy
    • Astrometry
    • Planetary science

    Background:

    • Simultaneous radio signal reception from multiple sources with close angular proximity is key.
    • Astrometric measurements require precise angular determination of celestial objects.

    Purpose of the Study:

    • To highlight the utility of radio signal intercomparison as an astrometric tool.
    • To demonstrate diverse applications of this technique in space exploration and astronomy.

    Main Methods:

    • Receiving and comparing radio signals from multiple sources simultaneously at several ground sites.
    • Utilizing the angular separation of sources to enhance measurement precision.

    Main Results:

    • The technique allows for precise tracking, such as the Lunar Rover relative to the Lunar Module.

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  • It enables accurate determination of lunar libration and measurement of Venus's atmospheric winds.
  • Radiometric mapping of Mars and locating planetary systems in an inertial frame are also demonstrated.

    • Conclusions:

    • Radio signal intercomparison is a versatile and powerful astrometric method.
    • This technique has broad applicability across various astronomical and planetary science investigations.
    • It offers a robust approach for high-precision measurements in space.