韩国VLBI网络的天体测量性能验证，使用SFPR与14/7 mm处的VLBA进行比较研究
Verification of the Astrometric Performance of the Korean VLBI Network, using comparative SFPR studies with the VLBA at 14/7 mm
摘要：
韩国VLBI网络（KVN）是一个新的毫米VLBI专用阵列，具有在多个频率（高达129 GHz）同时观测的能力。创新的多通道接收器为频域中的天体测量带来了显著的好处。这项工作的目的是验证的天体测量性能的KVN使用的VLBA，一个完善的仪器进行比较研究。为此，我们在2013年4月用KVN和VLBA在14/7 mm进行了几乎同期的观测。KVN观测由同时双频观测组成，而VLBA使用快速频率切换观测。我们使用源频率相位参考技术的观测和分析策略。我们发现，同时观测的结果在一个优越的性能，补偿所有大气条款的观测，除了提供其他显着的好处，天体测量分析。我们已经比较了KVN天体测量的VLBA。我们发现，结构混合效应引入占主导地位的系统天体测量的变化，这些需要考虑。我们已经测试了多种分析路线，以表征天体测量中扩展源的低分辨率效应的影响。KVN和完整VLBA数据集的分析结果在热误差估计的2- $σ$范围内一致。我们认为这种差异是由于决议不同造成的。我们发现，KVN提供的天体测量结果具有很好的协议，在1- $σ$，相比VLBA配置具有类似的分辨率。因此，本比较研究使用14/7 mm处的SFPR验证了KVN的天体测量性能，并验证了KVN作为天体测量仪器的有效性。
英文摘要：
The Korean VLBI Network (KVN) is a new mm-VLBI dedicated array with capability for simultaneous observations at multiple frequencies, up to 129 GHz. The innovative multi-channel receivers present significant benefits for astrometric measurements in the frequency domain. The aim of this work is to verify the astrometric performance of the KVN using a comparative study with the VLBA, a well established instrument. For that purpose, we carried out nearly contemporaneous observations with the KVN and the VLBA, at 14/7 mm, in April 2013. The KVN observations consisted of simultaneous dual frequency observations, while the VLBA used fast frequency switching observations. We used the Source Frequency Phase Referencing technique for the observational and analysis strategy. We find that having simultaneous observations results in a superior performance for compensation of all atmospheric terms in the observables, in addition to offering other significant benefits for astrometric analysis. We have compared the KVN astrometry measurements to those from the VLBA. We find that the structure blending effects introduce dominant systematic astrometric shifts and these need to be taken into account. We have tested multiple analytical routes to characterize the impact of the low resolution effects for extended sources in the astrometric measurements. The results from the analysis of KVN and full VLBA datasets agree within 2-$σ$ of the thermal error estimate. We interpret the discrepancy as arising from the different resolutions. We find that the KVN provides astrometric results with excellent agreement, within 1-$σ$, when compared to a VLBA configuration which has a similar resolution. Therefore this comparative study verifies the astrometric performance of KVN using SFPR at 14/7 mm, and validates the KVN as an astrometric instrument.
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