An attitude determination and control system of the ALSAT-1 first Algerian microsatellite

Mohammed, A. M. Si

doi:10.1109/rast.2003.1303902

Cited by 9 publications

(4 citation statements)

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“…At present, according to the micro-satellite's weight, mission, cost and accuracy requirements, reaction wheel and Magnetorquer are usually chosen as attitude control execution units. Using the earth magnetic field for attitude determination and control is an effective and economical solution [1] , which has been proved by many micro-satellites such as Alsat-1 [2] , Tsinghua-1 [3] and NS-1 [4] .…”

Section: Instructionmentioning

confidence: 99%

Magnetorquer Based Vertical Damping Method for Microsatellite Attitude Control

Hou

Yan

Jin

et al. 2012

AMM

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Aiming at a three-axis stabilized microsatellite, a novel attitude control method, called magnetorquer based vertical damping, is proposed to avoid the occurrence of the worst situation that the non-solar-battery-plane spins towards the sun. DSP based simulation results based on DSP show that the vertical damping method outperforms the simple damping method when no orbit information is available, simultaneously the whole attitude control scheme is simple and effective. The proposed solution guarantees a stable power supply from the electrical source even under the extreme situation, which improves the reliability of the whole microsatellite system.

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Section: Instructionmentioning

confidence: 99%

Magnetorquer Based Vertical Damping Method for Microsatellite Attitude Control

Hou

Yan

Jin

et al. 2012

AMM

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“…By using a single magnetic torque-rod this controller (usually adopted in conjunction to a spin-rate controller, which makes use of an additional orthogonally-placed magnetic torque-rod) can reduce the initial tumbling rate, eventually steering the satellite either towards a pure spin condition around one of its principal axes of inertia or to an almost zero residual angular rate. Its effectiveness was demonstrated through simulations before being successfully applied in several missions, such as SNAP-1 [8], FalconSAT-3 [9], UoSAT-12 [10], Alsat-1 [11], and SUMBANDILASAT [12].…”

Section: Introductionmentioning

confidence: 99%

Spacecraft dynamics under the action of Y-dot magnetic control law

et al. 2016

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The paper investigates the dynamic behavior of a spacecraft when a single magnetic torque-rod is used for achieving a pure spin condition by means of the so-called Y-dot control law. Global asymptotic convergence to a pure spin condition is proven on analytical grounds when the dipole moment is proportional to the rate of variation of the component of the magnetic field along the desired spin axis. Convergence of the spin axis towards the orbit normal is then explained by estimating the average magnetic control torque over one orbit. The validity of the analytical results, based on some simplifying assumptions and approximations, is finally investigated by means of numerical simulation for a fully non-linear attitude dynamic model, featuring a tilted dipole model for Earth׳s magnetic field. The analysis aims to support, in the framework of a sound mathematical basis, the development of effective control laws in realistic mission scenarios. Results are presented and discussed for relevant test cases

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“…The first Algerian microsatellite called Alsat-1 was also built with the collaboration with SSTL. This satellite opted to use the reaction wheel for a fine yaw pointing during the nadir pointing phase [8]. Therefore, the magnetic torquers were only used for the nutation and momentum unloading controls.…”

Section: Introductionmentioning

confidence: 99%