Structural control sensors for control, astrophysics, and structures experiment in space

Hugh W. Davis; John P. Sharkey; Connie K. Carrington

doi:10.1117/12.21506

1 October 1990 Structural control sensors for control, astrophysics, and structures experiment in space

Hugh W. Davis, John P. Sharkey, Connie K. Carrington

Proceedings Volume 1303, Advances in Optical Structure Systems; (1990) https://doi.org/10.1117/12.21506
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

The Control, Astrophysics and Structures Experiment in Space (CASES) will investigate critical control technology applicable to sthbilizing and pointing large flexible structures in space. This shuttle-based experiment will provide active control ofa 32 m extendibleboom structure usinggas thrusters for pointing and angular momentum exchange devices (AMED) for active damping to suppress vibrations. In conjunction with this controls-structures interaction experiment, an x-ray diffraction instrument will investigate high energy sources at the center of the galaxy and on the surface ofthe Sun. An occulter plate on the tip ofthe boom and proportional counters at the base of the boom comprise an x-ray telescope with a 32 m length. High spatial resolution depends on accurate knowledge and, to alesser extent, control ofthe position ofthe boom tip assembly relative to the proportional counters located at the base ofthe boom. The Remote Attitude Measurement Sensor (RAMS) was designed to provide high accuracy and update rates while measuring numerous reflective targets on a flexible structure. RAMS is presently baselined to fill two important sensor needs for CASES. First, as a tip displacement sensor, RAMS willprovide accurate knowledge ofthe position and orientation of the boom tip assembly. Second, as a boom motion tracker, RAMS will monitor 43 reflective targets that are distributed along the length ofthe boom and provide displacement (eigenvector) information for post-facto processing. This paper describes the design and operation of RAMS as both a tip displacement sensor and a boom motion tracker. It explains how RAMS interfaces with the CASES closed-loop control system and how systems identification is accommodated.

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Hugh W. Davis, John P. Sharkey, and Connie K. Carrington "Structural control sensors for control, astrophysics, and structures experiment in space", Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); https://doi.org/10.1117/12.21506

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KEYWORDS

Sensors

Control systems

Stars

Astrophysics

CCD image sensors

System identification

Charge-coupled devices

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