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1. (WO2018128612) DETERMINATION OF GUIDED-MUNITION ROLL ORIENTATION

Pub. No.:    WO/2018/128612    International Application No.:    PCT/US2017/012290
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Fri Jan 06 00:59:59 CET 2017
IPC: F41G 7/00
F41G 7/22
F41G 7/26
F41G 7/30
F41G 9/00
F42B 15/00
F42B 15/01
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
Abstract:
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.