Publications related to the GRACE Missions (no abstracts)

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Space interferometer imaging limitations due to Global Positioning System uncertainties and parasitic forces in Low Earth Orbit

Pogorelyuk, Leonid, Black, Mason, Belsten, Nicholas, Polini, Eleonora, Hansen, Jonah T., Ireland, Michael, Monnier, John D., and Cahoy, Kerri, 2024. Space interferometer imaging limitations due to Global Positioning System uncertainties and parasitic forces in Low Earth Orbit. Journal of Astronomical Telescopes, Instruments, and Systems, 10:025004, doi:10.1117/1.JATIS.10.2.025004.

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@ARTICLE{2024JATIS..10b5004P,
       author = {{Pogorelyuk}, Leonid and {Black}, Mason and {Belsten}, Nicholas and {Polini}, Eleonora and {Hansen}, Jonah T. and {Ireland}, Michael and {Monnier}, John D. and {Cahoy}, Kerri},
        title = "{Space interferometer imaging limitations due to Global Positioning System uncertainties and parasitic forces in Low Earth Orbit}",
      journal = {Journal of Astronomical Telescopes, Instruments, and Systems},
     keywords = {space interferometer, laser guide star, phase retrieval},
         year = 2024,
        month = apr,
       volume = {10},
          eid = {025004},
        pages = {025004},
     abstract = "{Space interferometers could, in principle, exploit the relatively stable
        space environment and ease of baseline reconfiguration to
        collect measurements beyond the limitations of ground-based
        interferometers. In particular, a two-element interferometer
        could provide excellent uv-plane coverage over a few tens of low
        Earth orbits. One of the challenges for free-flying
        interferometers is controlling the optical path distance with
        subwavelength accuracies despite the collectors flying up to
        hundreds of meters apart. We consider two approaches: an
        artificial in-orbit laser guide star (LGS) that provides a phase
        reference for the space interferometer and fringe tracking on
        the science target itself. The two approaches (LGS versus no
        LGS) would require different image processing techniques. In
        this work, we explore image processing with LGS phase residuals
        due to global positioning system (GPS) uncertainties. We use GPS
        uncertainties from the Gravity Recovery and Climate Experiment
        Follow-On mission to simulate image retrieval with a 300-m
        baseline laser-guided space interferometer. This is done by
        fitting the slowly varying phase errors of complex visibility
        measurements. We also consider a 40-m baseline interferometer
        with visibility(-modulus)-only measurements. In this case, we
        simulate the bias in visibility due to fringe tracking in the
        presence of parasitic forces acting on the spacecraft. We then
        use a modified version of the hybrid input-output phase
        retrieval algorithm for image reconstruction. We conclude that
        under our optimistic assumptions, both approaches could enable
        general imaging of a few large stars even with CubeSats,
        although an LGS would significantly improve the best resolution
        obtainable.}",
          doi = {10.1117/1.JATIS.10.2.025004},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2024JATIS..10b5004P},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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