Verification of the effectiveness of VSOP-2 phase referencing with a newly developed simulation tool, ARIS
Verification of the effectiveness of VSOP-2 phase referencing with a newly developed simulation tool, ARIS
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DOI：
10.1093/pasj/59.2.397
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发表时间：
2007-04-25
影响因子：
2.3
通讯作者：
Fomalont, Edward B.
中科院分区：
文献类型：
--
作者：
Asaki, Yoshiharu;Sudou, Hiroshi;Fomalont, Edward B.
下一代空间VLBI任务VSOP-2预计将在8.4 GHz、22 GHz和43 GHz频段提供前所未有的空间分辨率。在本报告中，基于一个名为ARIS的仿真工具，详细研究了VSOP-2的相位引用。设定了相位误差小于1弧度的相位参考成功准则。利用ARIS进行的仿真表明，即使在对流层条件较差的情况下，相位参考在8.4 GHz下也能获得良好的性能。在22 GHz和43 GHz，建议在良好或典型的对流层条件下进行相位参考观测。要求卫星具有1分钟或更短周期的姿态切换能力，远地点定轨精度高于类似10厘米；相位参考校准器要求单次扫描的信噪比大于4。通过VLBI测量，估计了找到合适相位参考校准器的概率。从校准器可用性的角度来看，8.4 GHz的VSOP-2相位参考是有希望的。然而，在22 GHz和43 GHz找到合适校准器的机会大大减少；重要的是对这些频率的每个目标进行具体调查。
The next-generation space VLBI mission, VSOP-2, is expected to provide unprecedented spatial resolution at 8.4, 22, and 43 GHz. In this report, phase referencing with VSOP-2 is examined in detail based on a simulation tool called ARIS. The criterion for successful phase referencing was set to keep the phase errors below one radian. Simulations with ARIS reveal that phase referencing achieves good performance at 8.4 GHz, even under poor tropospheric conditions. At 22 and 43 GHz, it is recommended to conduct phase referencing observations under good or typical tropospheric conditions. The satellite is required to have an attitude-switching capability with a one-minute or shorter cycle, and an orbit determination accuracy higher than similar to 10 cm at apogee; the phase referencing calibrators are required to have a signal-to-noise ratio larger than four for a single scan. The probability to find a suitable phase referencing calibrator was estimated by using VLBI surveys. From the viewpoint of calibrator availability, VSOP-2 phase referencing at 8.4 GHz is promising. However, the chance of finding suitable calibrators at 22 and 43 GHz is significantly reduced; it is important to conduct specific investigations for each target at those frequencies.