The DELTA STAR 17 sensor launched by Delta 183 presents a unique opportunity to examine the physical properties of earth backgrounds at spatial and temporal resolution not previously available in the 2.7Ã‚Âµm water and 4.3Ã‚Âµm CO2 absorption bands. However, due to partial instrument failure, and to certain design features, we have had to develop a very complicated calibration procedure for the data. We have designed and fabricated a special purpose analog video signal manipulation and storage device to allow us to recover data from the sensor. We have analyzed one background scene containing the earth limb and mid and high level clouds of various types in the 2.7 Ã‚Âµm band. We have obtained calibrated intensity values, and energy distribution such as power spectral density. Our preliminary results indicate that clouds show a log normal (definitely non-Gaussian) intensity distribution. We hope to examine spatial decorrelation lengths, intensity gradients and the short term temporal variations in cloud properties, and as we acquire more scenes, the variation of gross cloud morphology. We also intend to examine the 4.3Ã‚Âµm data, particularly to determine if small scale structure (contrast variations) are observable at or near the specular point.
R. M. O'Donnell,
"Overview of the stratrgic scene generation model (SSGM)", Proc. SPIE 1725, Targets, Backgrounds, and Discrimination, 17250D (29 January 1991); doi: 10.1117/12.2300213; https://doi.org/10.1117/12.2300213