Michael Shane Barker

US Patent:

8155819, Apr 10, 2012

Filed:

Aug 13, 2007

Appl. No.:

11/893007

Inventors:

Michael A. Barker - Tuscon AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01M 17/00
G06F 7/00
G06F 19/00
G06F 11/30
G07C 5/00

US Classification:

701 292, 701 3, 701 4, 701 328, 701 13, 73 138, 73 177, 73 178, 73652, 735033, 244 32, 244 323, 244164, 244165, 244194, 244195

Abstract:

The effects of IMU gyro and accelerometer bias errors are significantly reduced in accordance with the present teachings by a system or method for commanding an IMU or vehicle through a series of preprogrammed maneuvers. The maneuvers can be designed to minimize the effects of other gyro errors including scale factor errors, nonlinearities, cross coupling/misalignment, and scale factor asymmetries. A sample maneuver is provided which demonstrates performance based on a sequence of roll and yaw maneuvers resulting in zero build up of error at the end of a maneuver cycle period as a result of these errors. Modification of the system involves the addition of control logic to determine the maneuver period, maneuver rate, and vehicle orientation. No additional hardware beyond possible fuel required to perform the maneuver is required.

US Patent:

20150300780, Oct 22, 2015

Filed:

Apr 22, 2014

Appl. No.:

14/258274

Inventors:

- Waltham MA, US
William G. Graves - Tucson AZ, US
Michael A. Barker - Tucson AZ, US
Michael S. Alkema - Sahuarita AZ, US
Jeffrey S. Larson - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

F41G 7/00
F42B 15/01

Abstract:

A flight vehicle includes a nose portion, a fuselage retaining structure aft of the nose portion, and an axial motor for expelling axial thrust along a longitudinal axis of the flight vehicle. Radial motors are coupled to the retaining structure and axisymmetrically arranged about the axial motor. Each radial motor is configured to expel radial thrust radially outwardly in respect to the flight vehicle. Roll thrusters are operatively coupled with the radial motors and coupled to the fuselage retaining structure. The roll thrusters are configured to provide a roll moment of the flight vehicle about a central longitudinal axis of the flight vehicle. Ejectors are operatively coupled to the radial motors, and a controller is operatively coupled to the radial motors and the ejectors. The controller is configured to selectively fire and selectively eject the radial motors to maintain relative centering of a center of gravity of the flight vehicle.