CFRP mirror technology for cryogenic space interferometry: review and progress to date

2016 ◽  
Author(s):  
Martyn L. Jones ◽  
David Walker ◽  
David A. Naylor ◽  
Ian T. Veenendaal ◽  
Brad G. Gom
Keyword(s):  
Space Interferometry

Investigation on a Flexible Tether Slackness Based on In- and Out-of Plane Libration Angles

2012 ◽  
Vol 225 ◽  
pp. 411-416 ◽  
Author(s):  
Aaron Aw Teik Hong ◽  
Renuganth Varatharajoo
Keyword(s):  
Equation Of Motion ◽  
Rigid Bodies ◽  
Attitude Dynamics ◽  
Orbit Transfer ◽  
Operation System ◽  
Satellite Systems ◽  
Out Of Plane ◽  
Tethered Satellite Systems ◽  
Libration Angle ◽  
Space Interferometry

Tethered Satellite Systems (TSS) have been used in various applications such as in performing space interferometry, orbit transfer and other relevant fields. As far as the operation system of a TSS is concerned, it is crucial to ensure that the tether will not go slack as its slackness would adversely affects the overall operation outcome due to an undesirable system dynamics. Therefore, it is important to investigate the types of conditions that will cause the tether slackness. Investigations on in-plane and out-of plane libration angles can be utilized to measure at what point that the tether will go slack. Based on previous research works, usually a rigid tether comprising of a uniformed mass is considered while the connecting two satellites are regarded as point masses in order to simplify the governing dynamics equation of motion. However, in order to develop a much more accurate modeling, a flexible tether is chosen by further incorporating the reeling mechanism, attitude dynamics of rigid bodies and tether deformations. Furthermore, a tether has a tendency to go slack if the in-plane and out-of plane libration angle exceeds 65° and 60° respectively regardless of the types of tether utilized whether it being a rigid or a flexible one. Thus, the tension of the tether will serves as a constraint and plotted against the in-plane and out-of plane libration motions that would be attained via the generalized forces. The results will then be analyzed to establish in-plane and out-of plane libration boundaries. Subsequently, the in-plane and out-of plane operation contrains are established for TSS corresponding to a reference mission.

Average phase calculations with near-field diffraction algorithms for the Space Interferometry Mission

2000 ◽  
Author(s):  
Miltiadis V. Papalexandris ◽  
Scott A. Basinger ◽  
David C. Redding
Keyword(s):  
Near Field ◽  
Space Interferometry

Space Interferometry Mission

2000 ◽  
Author(s):  
Stephen C. Unwin ◽  
Michael Shao
Keyword(s):  
Space Interferometry
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