The declination degeneracy in interferometric astrometry

The declination degeneracy in interferometric astrometry
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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
Buscher D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Buscher D

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无线电和光波长的干涉天体测量是一种基本的、高精度的天文测量方法,一种测量天体位置和大地测量及地球定向的精密方法,目的是确定在目标的离散距离为1000米的情况下,由同一数据同时估计干涉基线和天体目标位置时所产生的简并的重要性和形式。有限的。MethodsHeuristic分析一个理想化的干涉实验被用来确定如何简并可能会出现作为有限的decompression覆盖的结果,它可能采取什么形式。奇异值分解的模拟实验,不同的decelerometer覆盖率和不同的小时角覆盖率,然后被用来量化的退化的存在和形式的退化example cases.ResultsA显着的退化的水平被发现强烈依赖于decelerometer覆盖率和小时角覆盖率的实验。即使当十度角覆盖范围从极点延伸到赤道时,简并也是显著的。的退化采取的形式是一个系统的失真的测量坐标在declute-direction这是更大的赤道附近比在两极,连同相应的基线distortion.ConclusionsTaking into account这种退化的定量方式可以有显着的影响的设计和解释的天体测量和大地测量实验。
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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