Advances in Modeling the Obstruction in the HIRDLS Optical Train,and Resulting Data

摘要

A piece of plastic film came loose during launch and blocked most of the optical aperture. The largest remaining problem in correcting the measured radiances is the removal of the signals from this blockage. The present method is briefly described, followed by an outline of a new version, called the (ST)3 method. It relies on more understanding of the behavior of the blockage signals acquired in previous work. The method involves Scaling and Time interpolating the signals, Shifting them to align features, and Translating them to recover the scaled value at the reference angle. The residuals are represented by empirical orthogonal functions, coefficients of which may be Substituted from other channels. Finally, allowance for long-term Temporal changes in the blockage signals are being developed. Results for a day in the middle of the mission are presented, as well as their effects on water vapor retrievals.