Abstract: In a bank-to-turn autopilot, increased accuracy and insensitivity to tracking noise and glint are achieved by using a yaw LOS rate to drive the roll rate loop and by sending only a body coordinate pitch LOS rate to a pitch channel so as to not introduce errors in the cross plane. By uncoupling the pitch and roll loops, pitch/yaw/roll coupling, large roll transients, and cross plane maneuvers can be minimized. Additionally, body LOS rates are transformed to inertial LOS rates and subsequently back to body LOS rates such that guidance filtering may be performed in a non-rolling frame of reference. This allows the guidance filtering to be separately optimized without regard to destabilizing effects of such filtering due to roll-to-yaw coupling path lags. In other words, servo dynamic path lags are reduced since the guidance filters do not have to track the high frequency roll rates.

Abstract: An electronically stabilizer tracking system is provided using a beam-steerable radiating array driven by parameters of motion of a body to which the array is mounted. In a specific application, the beam of a strapped down seeker is electronically gimballed to provide an inertially-stable observation platform. Potential instability caused by corrupted weapon-to-target angle information is therefore avoided. By using a fiber-optic gyro, the beam may be very accurately controlled to negate the guidance effects of body motion of the weapon.