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October 25, 2012

Mtg: Reference Technologies for Precision Navigation and Control in Space

by @ 1:15 pm. Filed under ALL, Electronics Design, Optics/Displays, Semiconductors

TUESDAY November 13, 2012
SCV Electromagnetic Compatibility Chapter
Speakers: Karthik Balakrishnan and Andreas Zoellner, Stanford University
Time: Networking and light dinner at 5:30 PM; presentations at 6:30 PM
Cost: none
Place: Stanford University, Physics and Astrophysics/Hansen Experimental Physics Lab building, room 102, Stanford
RSVP: from website

The Space Gravity Group at Stanford is currently working on a Modular Gravitation Reference Sensor (MGRS), a drag free sensor which enables advances in Earth science and precision distributed Earth-observing sensors, as well as space science, precise orbit determination and maintenance, and precision spacecraft formation flying.? During our talk, we will describe the MGRS, and give more detail on two sub-systems, the Differential Optical Shadow Sensor (DOSS) and UV-LED based charge control.? Precise control over the electric potential of an electrically isolated proof mass is necessary for the operation of an MGRS.? On-orbit charging caused by cosmic rays, as well as during caging and uncaging of the proof mass, leads to an electrostatic attraction between the proof mass and its housing.? We will show how AlGaN UV LEDs are used to control proof mass potential on an spherical proof mass in an MGRS-like configuration and will provide a look ahead to an upcoming technology demonstration mission of UV LEDs.? The DOSS is used as a high precision, compact, low-cost displacement sensor in the MGRS.? We will describe how the sensor detects external disturbances by measuring relative motion between the proof mass and spacecraft, with a performance goal of 1 nm at 1 mHz.? The DOSS then feeds this signal to the spacecraft control system to maintain a geodesic orbit.? We will finally describe a proposed drag-free CubeSat mission built around the MGRS.

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