Publications related to the GRACE Missions (no abstracts)

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Absolute frequency readout derived from ULE cavity for next generation geodesy missions

Rees, Emily Rose, Wade, Andrew R., Sutton, Andrew J., Spero, Robert E., Shaddock, Daniel A., and Mckenzie, Kirk, 2021. Absolute frequency readout derived from ULE cavity for next generation geodesy missions. Optics Express, 29(16):26014, doi:10.1364/OE.434483.

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@ARTICLE{2021OExpr..2926014R,
       author = {{Rees}, Emily Rose and {Wade}, Andrew R. and {Sutton}, Andrew J. and {Spero}, Robert E. and {Shaddock}, Daniel A. and {Mckenzie}, Kirk},
        title = "{Absolute frequency readout derived from ULE cavity for next generation geodesy missions}",
      journal = {Optics Express},
         year = 2021,
        month = aug,
       volume = {29},
       number = {16},
        pages = {26014},
     abstract = "{The next generation of Gravity Recovery and Climate Experiment
        (GRACE)-like dual-satellite geodesy missions proposals will rely
        on inter-spacecraft laser interferometry as the primary
        instrument to recover geodesy signals. Laser frequency stability
        is one of the main limits of this measurement and is important
        at two distinct timescales: short timescales over 10-1000
        seconds to measure the local gravity below the satellites, and
        at the month to year timescales, where the subsequent gravity
        measurements are compared to indicate loss or gain of mass (or
        water and ice) over that period. This paper demonstrates a
        simple phase modulation scheme to directly measure laser
        frequency change over long timescales by comparing an on-board
        Ultra-Stable Oscillator (USO) clocked frequency reference to the
        Free Spectral Range (FSR) of the on-board optical cavity. By
        recording the fractional frequency variations the scale
        correction factor may be computed for a laser locked to a known
        longitudinal mode of the optical cavity. The experimental
        results demonstrate a fractional absolute laser frequency
        stability at the 10 ppb level (10{\ensuremath{-}}8) at time
        scales greater than 10 000 seconds, likely sufficient for next
        generation mission requirements.}",
          doi = {10.1364/OE.434483},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2021OExpr..2926014R},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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