Salīdzināt metodes

	SGP4 TLE propagācija	B-Dot kontrolieris	Kvaaternionu attēlojums
Nozare	Aviācija un kosmonautika	Aviācija un kosmonautika	Aviācija un kosmonautika
Saime	Process / pipeline	Process / pipeline	Process / pipeline
Izcelsmes gads	1970s	1980s	1843
Autors	NORAD, USAF	Spacecraft attitude control engineers	William Hamilton (quaternions), aerospace engineers
Tips	Propagation method	Control law	Mathematical framework
Pirmavots	Vallado, D. A., Crawford, P., Hujsa, R., & Kelso, T. S. (2006). Revisiting Spacetrack Report Number 3. In AIAA/AAS Astrodynamics Specialist Conference.	Wertz, J. R. (Ed.). (2002). Spacecraft Attitude Determination and Control. Kluwer Academic.	Shuster, M. D. (1993). A survey of attitude representations. Journal of the Astronautical Sciences, 41(4), 439–517.
Citi nosaukumi	SGP4, TLE propagation, simplified perturbations	B-dot control, magnetic damping, momentum dumping	quaternion representation, attitude kinematics, q-vector
Saistītās	3	3	3
Kopsavilkums	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.	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.	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.