Fuel-optimal control for spacecraft formation flying and reconfiguration propelled Using Electromagnetic forces.
Abstract
With the development of small satellite technique, a spacecraft capable of producing higher-than-natural electrostatic charges may keep desired relative distances and orientations via the Lorentz-force interaction with a planetary magnetic field. This paper presented Hybrid combination of Lorentz forces provided by modulating spacecraft's electrostatic charge (magnetic and electric fields), using a Cartesian coordinates-based description of the spacecraft's relative states. Numerical simulation results are provided to demonstrate the functionality of the proposed controller to correct the drift due to J2 perturbations.We have used two different examples of formation flying satellites, the first example (TanDEM-X - TERRA SAR X) have relative poison about 3 km, the second (CLOUDSAT- CALIPSO) have about 600 km. The obtained results confirm that in the first case the effect off j2 on relative poison is about 3.9 km through 10 periods, and the magnitude of charge to mass ratio (q/m) must be -0.256 C/kg to correct about 3.7 km when used magnetic part of Lorentz force only. In addition, the rest of drift 0.2 km has been coerced after the electric part of Lorentz are considered.On the other hand, the drift of the second case for relative position due to J2 is about 2.1 km through 15 periods, and we need a charge to mass ratio + 0.185 C/kg to corrected 1.9, and 0.2 km using magnetic and electric parts of Lorentz force respectively. Finally, the required velocity increment (_V) for controlling in both cases charged and uncharged spacecraft are presented.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E...6A