Fast response projectile roll estimator

Details Fast response projectile roll estimator Fast response projectile roll estimator

2009-09-16

2011-11-01

Caputo, Lisa (Department: 2855)

Measuring and testing

Ordnance and projectile

C701S220000

Reexamination Certificate

active

08047070

ABSTRACT:
An apparatus and method for estimating a roll angle of a projectile may include a measurement unit outputting roll rate, yaw rate, and pitch rate signals indicative of rotation rates about substantially orthogonal roll, yaw, and pitch axes, the roll axis substantially aligned with a longitudinal axis of the projectile. A controller may sample the roll rate, yaw rate, and pitch rate signals to obtain time sequential roll rate, yaw rate, and pitch rate samples; calculate time sequential cumulative roll estimates by summing the roll rate samples; calculate time sequential gravity vector estimates from the corresponding yaw rate and pitch rate samples; de-roll each gravity vector estimate based on the corresponding cumulative roll estimate; filter the de-rolled gravity vector estimates to determine a filtered initial roll estimate; and add the filtered initial roll estimate to the current cumulative roll estimate to provide a current roll angle estimate.

REFERENCES:
patent: 5886257 (1999-03-01), Gustafson
patent: 6208936 (2001-03-01), Minor et al.
patent: 7395987 (2008-07-01), Lindquist
patent: 2009/0299579 (2009-12-01), Hac et al.

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