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| Attitude quaternion× | TCAS× | |
|---|---|---|
| Domaine | Aérospatiale | Aérospatiale |
| Famille | Process / pipeline | Process / pipeline |
| Année d'origine≠ | 1843 | 1989 |
| Auteur d'origine≠ | William Hamilton (quaternions), aerospace engineers | FAA, ICAO |
| Type≠ | Mathematical framework | Avionics system |
| Source fondatrice≠ | Shuster, M. D. (1993). A survey of attitude representations. Journal of the Astronautical Sciences, 41(4), 439–517. link ↗ | Federal Aviation Administration (2017). Traffic Collision Avoidance System (TCAS II). Technical Standard Order TSO-C119c. link ↗ |
| Alias | quaternion representation, attitude kinematics, q-vector | TCAS II, ACAS, traffic avoidance |
| Apparentées | 3 | 3 |
| Résumé≠ | 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. | TCAS (Traffic Collision Avoidance System) is an airborne safety system that detects nearby aircraft using radar and mode C altitude reports, then provides traffic advisories (TAs) and recommended collision avoidance maneuvers (RAs) to flight crews. Mandated globally on commercial aircraft since 2000, TCAS is considered a last line of defense against mid-air collisions. TCAS II is the most common variant; TCAS I is a simplified advisory-only version for general aviation. |
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