Satellite Test of the Equivalence Principle - Control and Simulation

摘要

The Satellite Test of the Equivalence Principle (STEP) proposes to test equivalence between inertial and gravitational mass with five orders of magnitude more precision than previously tested. The largest disturbance in STEP'S orbit arising from atmospheric drag is at the same frequency as the science signal, therefore the mission must be flown drag free. Several control architectures have been assessed for the mission. This paper presents an evaluation of proposed control schemes applicable to STEP. A general overview of the system dynamics will be given as well as special consideration of measurement directions and sensitivities due to the experimental design. The development of a mission simulator as a supporting tool in the project development is addressed based on lessons learned from the predecessor mission Gravity Probe B.