Guidance of a Roll-Only Camera for Ground Observation in Wind

摘要: How a nose-mounted imaging sensor with single-motion axis in roll can be used for ground observation is demonstrated. Itis shown that point, line, andarea areallpossiblein thepresenceofwind.Continuous point possible by the use of an orbital trajectory conjunction lookdown angle 90 deg. For other angles trajectories are spirals. Algorithms derived aircraft guidance including cases arbitrary and stationary or moving points, effects illustrated using six-degree-of-freedom simulation model. The attitude, wind estimation, height errors discussed. Nomenclature C = orbit circumference c C=H E distance east e E=H g acceleration due to gravity H altitude KA heading control gain N north n N=H nacc load factor R range from target R0 perifocus r R=H T period u inertial velocity vector ur airspeed