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

摘要

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.