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| Contrôleur B-Dot× | TCAS× | |
|---|---|---|
| Domaine | Aérospatiale | Aérospatiale |
| Famille | Process / pipeline | Process / pipeline |
| Année d'origine≠ | 1980s | 1989 |
| Auteur d'origine≠ | Spacecraft attitude control engineers | FAA, ICAO |
| Type≠ | Control law | Avionics system |
| Source fondatrice≠ | Wertz, J. R. (Ed.). (2002). Spacecraft Attitude Determination and Control. Kluwer Academic. link ↗ | Federal Aviation Administration (2017). Traffic Collision Avoidance System (TCAS II). Technical Standard Order TSO-C119c. link ↗ |
| Alias | B-dot control, magnetic damping, momentum dumping | TCAS II, ACAS, traffic avoidance |
| Apparentées | 3 | 3 |
| Résumé≠ | The B-Dot controller (magnetic B-dot control law) is a simple, robust spacecraft attitude control method that uses the rate of change of Earth's magnetic field measured onboard to generate a magnetic dipole moment. Developed in the 1980s, the B-Dot law damps spacecraft angular momentum without requiring a complex attitude estimate or external reference, making it ideal for initial momentum dumping after launch or in contingency scenarios. B-Dot is passive, simple to implement, and effective. | 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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