Calibration of ship attitude reference

Details Calibration of ship attitude reference Calibration of ship attitude reference

2006-12-28

2008-11-11

Hellner, Mark (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Aeronautical vehicle

C701S222000, C701S220000, C701S003000, C701S004000, C244S164000

Reexamination Certificate

active

07451022

ABSTRACT:
A ship includes a star tracker mounted on a platform stabilized in ENU by the inertial navigation system (INS). The line-of-sight (LOS) of the star tracker is directed toward two separated stars, and the LOS difference angles are noted. The angles are processed to generate vector triads representing geodetic (ephemeris) and navigation system attitude. The triads are processed to generate a coordinate transformation matrix. The transformation matrix is separated into systematic error and reference attitude error. The reference attitude error is summed with the inertial navigation system attitude to generate corrected ENU attitude. The corrected attitude is used as a reference for shipboard sensors, to reduce errors when the sensor data is linked to other platforms.

REFERENCES:
patent: 5852792 (1998-12-01), Nielson
patent: 2005/0071055 (2005-03-01), Needelman et al.
patent: 2007/0038374 (2007-02-01), Belenkii et al.

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