Abstract
The Scanning High-resolution Interferometer Sounder (S-HIS) instrument is a cross track scanning Fourier-transform interferometer with 0.5 wavenumber resolution. It is comprised of three detectors, which are the shortwave (SW), midwave (MW), and longwave (LW). Vibration experienced during flight can cause a significant level of spectrally correlated noise in the calibrated spectra. The S-HIS instrument has a wavefront tilt measurement system that monitors vibration induced optical tilts, which both reduces the interferometric noise and makes it possible to remove it with post processing. This two-axis tilt measurement system records small changes in the wavefront angles during the data collection of both scene and blackbody interferograms. The amplitude-modulation errors dominate the SW band while sample-position errors are found in the LW and MW bands. Here we show that the sample-position errors can be removed from the final calibrated radiances.
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