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| Representació d'actitud quaterniònica× | Propagació TLE SGP4× | |
|---|---|---|
| Camp | Aeroespacial | Aeroespacial |
| Família | Process / pipeline | Process / pipeline |
| Any d'origen≠ | 1843 | 1970s |
| Autor original≠ | William Hamilton (quaternions), aerospace engineers | NORAD, USAF |
| Tipus≠ | Mathematical framework | Propagation method |
| Font seminal≠ | Shuster, M. D. (1993). A survey of attitude representations. Journal of the Astronautical Sciences, 41(4), 439–517. link ↗ | Vallado, D. A., Crawford, P., Hujsa, R., & Kelso, T. S. (2006). Revisiting Spacetrack Report Number 3. In AIAA/AAS Astrodynamics Specialist Conference. DOI ↗ |
| Àlies | quaternion representation, attitude kinematics, q-vector | SGP4, TLE propagation, simplified perturbations |
| Relacionats | 3 | 3 |
| Resum≠ | Quaternion attitude representation is a mathematical framework for describing three-dimensional rotations using four-dimensional vectors (quaternions). Superior to Euler angles due to the absence of singularities (gimbal lock), quaternions are the standard representation in modern attitude estimation, spacecraft control, and 3D computer graphics. Quaternion kinematics elegantly expresses how attitude evolves under angular velocity measurements from gyroscopes. | SGP4 (Simplified General Perturbations 4) is a rapid orbital propagation method that predicts satellite position and velocity from Two-Line Element (TLE) sets published by NORAD. Developed in the 1970s, SGP4 accounts for atmospheric drag, gravitational perturbations, and solar radiation pressure using simplified analytical models. SGP4 is the de facto standard for space surveillance, conjunction assessment, and satellite tracking. |
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