Spacecraft with modulated thrust electrostatic ion thruster...

Details Spacecraft with modulated thrust electrostatic ion thruster... Spacecraft with modulated thrust electrostatic ion thruster...

F - Mech Eng,Light,Heat,Weapons

03

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358/25, 310/3, 2

F03H 1/00 (2006.01) B64G 1/28 (2006.01) B64G 1/40 (2006.01) B64G 1/24 (2006.01) B64G 1/26 (2006.01)

Patent

CA 1326226

SPACECRAFT WITH MODULATED THRUST ELECTROSTATIC ION THRUSTER AND ASSOCIATED METHOD ABSTRACT OF THE DISCLOSURE An axial electrostatic ion thruster (10) for use on a dual-spin stabilized spacecraft (70) is disclosed. The thruster (10) is mounted on the spun portion (72) of the spacecraft (70) and continuously fired for an integral number of spin periods to provide north-south velocity and attitude control. To achieve zero attitude precession with a statically imbalanced despun platform (74) or an intentional attitude precession generally, the ion thrust is spin-synchronously varied between two non- zero levels to achieve a prescribed Fourier component amplitude and phase at the spin frequency. Modulation of the thrust is achieved with constant ion beam current by complementary modulation of the beam voltage, VB, and accel voltage, VA by varying the ion extraction system grid voltages. This varies the thrust while maintaining a constant total accelerating voltage VTOT = VB + ¦VA¦.

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