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The Dynamic Behavior Of A Fixed Earth Scene As Viewed By A Satellite-Borne Staring Mosaic Sensor

A satellite-borne staring mosaic sensor has a line-of-sight that is stabilized on a fixed earth point. As the satellite passes near this point, detectors not on the line of sight are subjected to noise produced by apparent background motion. This motion is produced by footprint shrinkage, change in aspect angle, and earth rotation. The motion is affected by satellite orbit parameters, earth location of the observed scene, and detector location in the sensor focal plane. Additional motion produced by satellite instability may increase these effects or negate them depending on random direction. Equations are presented which enable the instantaneous description of the complete state of the focal plane scene. Samples of dynamic detector footprints, views of changing earth scenes, and graphs of background velocities are included. Effect of spacecraft instability is presented in terms of upper and lower bounds on the velocity magnitudes.