Laser Interferometer Space Antenna, LISA |
Laser Interferometer Space Antenna, LISA |
Feb 9 2006, 03:48 PM
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
General Relativity and Quantum Cosmology, abstract
gr-qc/0602033 From: Graham Woan [view email] Date: Wed, 8 Feb 2006 18:04:22 GMT (57kb) A principal component analysis for LISA -- the TDI connection Authors: J. D. Romano, G. Woan Comments: 7 pages, 3 figures, 1 table Data from the Laser Interferometer Space Antenna (LISA) is expected to be dominated by frequency noise from its lasers. However the noise from any one laser appears more than once in the data and there are combinations of the data that are insensitive to this noise. These combinations, called time delay interferometry (TDI) variables, have received careful study, and point the way to how LISA data analysis may be performed. Here we approach the problem from the direction of statistical inference, and show that these variables are a direct consequence of a principal component analysis of the problem. We present a formal analysis for a simple LISA model and show that there are eigenvectors of the noise covariance matrix that do not depend on laser frequency noise. Importantly, these orthogonal basis vectors correspond to linear combinations of TDI variables. As a result we show that the likelihood function for source parameters using LISA data can be based on TDI combinations of the data without loss of information. http://arxiv.org/abs/gr-qc/0602033 -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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May 2 2006, 02:26 PM
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
We study the limits on how accurately LISA will be able to estimate the parameters of low-mass compact binaries, comprising white dwarfs (WDs), neutron stars (NSs) or black holes (BHs), while battling the amplitude, frequency, and phase modulations of their signals.
http://arxiv.org/abs/astro-ph/0605034 -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Feb 12 2013, 05:36 PM
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#3
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Member Group: Members Posts: 206 Joined: 15-August 07 From: Shrewsbury, Shropshire Member No.: 3233 |
The following link suggests that the micro-propulsion system for the Lisa Pathfinder mission may change from Field Emission
Electric Propulsion to one of the listed alternative propulsion systems: http://agenda.infn.it/getFile.py/access?co...amp;confId=3807 Here is another interesting link describing recent developments in the Lisa Pathfinder mission: http://www.rssd.esa.int/SP/LISAPATHFINDER/...er%20status.pdf |
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Jan 27 2016, 06:40 PM
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Member Group: Members Posts: 206 Joined: 15-August 07 From: Shrewsbury, Shropshire Member No.: 3233 |
The LISA Pathfinder spacecraft is on station and is ready to begin its scientific mission:
http://spaceflightnow.com/2016/01/25/lisa-...les-from-earth/ |
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