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|1. (WO2018128612) DETERMINATION OF GUIDED-MUNITION ROLL ORIENTATION|
|Applicants:||BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION, INC.
|Inventors:||SCHORR, David J.
BATCHELDER, Jason H.
GIBSON, Jeremy B.
STEENSON JR., James H.
VASILE, Joseph D.
|Title:||DETERMINATION OF GUIDED-MUNITION ROLL ORIENTATION|
Techniques are provided for determination of a guided-munition orientation during flight based on lateral acceleration, velocity, and turn rate of the guided-munition. A methodology implementing the techniques, according to an embodiment, includes obtaining a lateral acceleration vector measurement and a velocity of the guided-munition, and calculating a ratio of the two, to generate an estimated lateral turn vector of the guided-munition. The method also includes integrating the estimated lateral turn vector, over a period of time associated with flight of the guided-munition, to generate a first type of predicted attitude change. The method further includes obtaining and integrating a lateral turn rate vector measurement of the guided-munition, over the period of time associated with flight of the guided-munition, to generate a second type of predicted attitude change. The method further includes calculating a gravity direction vector based on a difference between the first and second types of predicted attitude change.