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arXiv 1303.3402astro-ph.IM
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MultiView方法在低频高精度天体测量空间VLBI中的应用

The application of MultiView Methods for High Precision Astrometric Space VLBI at Low Frequencies

R. Dodson, M. Rioja, Y. Asaki, H. Imai, X. -Y. Hong, Z. Shen

备注：
Accepted in AJ
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摘要：

在常规频率范围的低端（即20厘米）进行高精度的空间甚长基线干涉测量（S-VLBI）是许多高优先级科学目标的要求。这些标题是通过获得三角视差距离脉冲星-黑洞对和OH脉泽在银河系和麦哲伦云的任何地方的恒星。我们提出了一种解决S-VLBI中最困难的技术问题的多视图方法，其中多个源，在天空中分开几度，同时观察。我们模拟了一些具有挑战性的S-VLBI配置，轨道误差高达8米的大小和电离层大气一致的条件差。在这些模拟中，我们进行了多视图分析，以实现所需的科学目标。这种方法消除了需要控制力矩陀螺仪的波束切换的需要，以及天基射电望远镜高质量轨道重建所需的空间和地面基础设施。这将大大降低采用相位参考技术的S-VLBI任务的复杂性。

英文摘要：

High precision astrometric Space Very Long Baseline Interferometry (S-VLBI) at the low end of the conventional frequency range, i.e. 20cm, is a requirement for a number of high priority science goals. These are headlined by obtaining trigonometric parallax distances to pulsars in Pulsar--Black Hole pairs and OH masers anywhere in the Milky Way Galaxy and the Magellanic Clouds. We propose a solution for the most difficult technical problems in S-VLBI by the MultiView approach where multiple sources, separated by several degrees on the sky, are observed simultaneously. We simulated a number of challenging S-VLBI configurations, with orbit errors up to 8m in size and with ionospheric atmospheres consistant with poor conditions. In these simulations we performed MultiView analysis to achieve the required science goals. This approach removes the need for beam switching requiring a Control Moment Gyro, and the space and ground infrastructure required for high quality orbit reconstruction of a space-based radio telescope. This will dramatically reduce the complexity of S-VLBI missions which implement the phase-referencing technique.

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