The ST-7 Disturbance Reduction System
Sasha Buchman
Stanford University
sasha@relgyro.stanford.edu
Additional authors: R. Byer, D. DeBra, D. Gill, J. Hanson, G.M. Keiser, D. Lauben, S. Williams
The Drag Reduction System (DRS) Space Technology (ST-7) flight will demonstrate two key strategic technologies: 1) disturbance reduction to a residual acceleration of less than 3*10e-14 m/s^2/rtHz[1+(f/3 mHz)^2] over a frequency range of 1 mHz to 30 mHz and 2) spacecraft position control to 10nm/rtHz. Applications of these technologies are relevant to all future drag free missions as well as future interferometry constellation missions. The ST-7 mission will demonstrate the required performance for the Laser Interferometer Space Antenna (LISA) observatory to within a factor of ten and will verify the error sources modeling. We describe the design and implementation of the Gravity Reference Sensor (GRS) and the status of the DRS flight project. The system is scheduled to complete a Critical Design Review in July 2004.
