Determining Inertial Orientation of a Spinning Body With Body-Fixed Sensors

Report No. ARL-TR-2313
Authors: David J. Hepner, Thomas E. Harkins
Date/Pages: January 2001; 35 pages
Abstract: A methodology for determining absolute inertial angular orientation of a spinning body via independent angular measurements from two arbitrary body-fixed sensor systems is demonstrated. A particular application is denoted that uses Army Research Laboratory solar likeness indicating transducers and magneto-resistive sensors that provide body-fixed, independent angular measurements with regard to their respective local fields. Knowledge of the local field orientations and a coordinate transformation provides the inertial orientation angles, commonly called y and q, which are useful for evaluating and developing advanced flight bodies and as a navigational aid for brilliant munitions. The combination of a dual field sensor system and the orientation determination methodology is called POINTER (Projectile Orientation In Navigation TERms). Typical sensor data and reduction processes are reviewed for a spinning body containing optical and magnetic sensors, and alternate field measurements are discussed.
Distribution: Approved for public release
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Last Update / Reviewed: January 1, 2001