The NASA Spaceflight article ICON resets for October launch from the East Coast indicates that the Ionospheric Connection Explorer is scheduled to launch in October 2018 from an airplane! (Pegasus XL).
ICON will be equipped with four instruments: a Michelson interferometer, built by the United States Naval Research Laboratory, will measure the winds and temperatures in the thermosphere; an ion drift meter, built by UT Dallas, will measure the motion of charged particles in the ionosphere; and two ultraviolet imagers built at UC Berkeley will observe the airglow layers in the upper atmosphere in order to determine both ionospheric and thermospheric density and composition. (emphasis added)
According to this NASA page:
MIGHTI: The Michelson Interferometer for Global High-resolution Thermospheric Imaging instrument observes the temperature and speed of the neutral atmosphere. These winds and temperature fluctuations are driven by weather patterns closer to Earth’s surface. In turn, the neutral winds drive the motions of the charged particles in space. MIGHTI is built by the Naval Research Laboratory in Washington, DC. (emphasis added)
I'm just guessing that the Michelson interferometer is used as an imaging Fourier transform infrared spectrometer, or FTIR so it can build up a black body thermal spectrum for each point imaged. While etalons are usually used for the highest resolutions, a Michelson interferometer would work as well.
But I don't understand how MIGHTI will measure wind speed. I can't imagine its resolution is so high that it's making a doppler measurement!
Question: How will the Ionospheric Connection Explorer (ICON)'s Michelson interferometer measure wind speed?