The declination degeneracy in interferometric astrometry
The declination degeneracy in interferometric astrometry
复制标题
干涉天体测量中的赤纬简并度
DOI:
10.1051/0004-6361/201118393
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发表时间:
2012
影响因子:
6.5
通讯作者:
Buscher D
中科院分区:
文献类型:
--
作者:
Buscher D
ContextInterferometric astrometry at radio and optical wavelengths serves as a fundamental and high-precision method for measuring the positions of celestial objects and for geodetic and Earth orientation measurements.AimsWe determine the importance and form of the degeneracy which arises when the interferometric baselines and the celestial target positions are estimated simultaneously from the same data under circumstances where the declination range of the targets is limited.MethodsHeuristic analyses of an idealised interferometric experiment were used to determine how a degeneracy could arise as a result of limited declination coverage and what form it might take. Singular Value Decomposition of simulated experiments with different declination coverages and different hour-angle coverages were then used to quantify the level of degeneracy present and the form of the degeneracy in example cases.ResultsA significant degeneracy was found which depends strongly on the declination coverage and less strongly on the hour-angle coverage of the experiment. The degeneracy is significant even when the declination coverage extends from the pole to the equator. The degeneracy takes the form of a systematic distortion of the measured coordinates in the declination direction which is larger near the equator than at the poles, together with a corresponding baseline distortion.ConclusionsTaking into account this degeneracy in a quantitative way can have a significant effect on the design and interpretation of astrometric and geodetic experiments.
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影响因子:
6.5
作者:
J. Sokolova;Z. Malkin
通讯作者:
J. Sokolova;Z. Malkin
DOI:
--
发表时间:
2000
期刊:
Publications Astronomical Society of Australia
影响因子:
--
作者:
Andrew Goodman
通讯作者:
Andrew Goodman
DOI:
--
发表时间:
2007
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
作者:
R. Launhardt;T. Henning;D. Queloz;A. Quirrenbach;F. Delplancke;N. Elias;F. Pepe;S. Reffert;D. Ségransan;J. Setiawan;R. Tubbs
通讯作者:
R. Tubbs
DOI:
--
发表时间:
1973
期刊:
影响因子:
--
作者:
M. Ryle;B. Elsmore
通讯作者:
B. Elsmore
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
C. Hummel;D. Mozurkewich;N. Elias;A. Quirrenbach;D. Buscher;J. Armstrong;K. Johnston;R. Simon;D. Hutter
通讯作者:
D. Hutter