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首页> 外文期刊>Earth, planets and space: EPS >Estimation of scan-gap limits on phase delay connections in Delta VLBI observations based on the phase structure function at a short time period
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Estimation of scan-gap limits on phase delay connections in Delta VLBI observations based on the phase structure function at a short time period

机译：基于短时相结构函数的Delta VLBI观测中相位延迟连接的扫描间隙极限估计

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The maximum scan-gap length which connects phase delays from scan to scan over a gap is an important issue in Delta Very Long Baseline Interferometry (D-VLBI), and it is affected by delay fluctuations caused by the wet troposphere. It has recently become possible to obtain near real-time fringe phases by using an e-VLBI technique that realizes real-time VLBI by connecting stations through high-speed Internet. Such real-time VLBI raises the possibility of dynamic D-VLBI scheduling, which changes scan and gap length dynamically according to the weather condition of the date. We have investigated this possibility by using phase structure functions obtained from continuous VLBI observations at S- and X-bands for 1-2 h at the Kashima, Gifu, and Koganei stations (not real-time ones). Five VLBI sessions were conducted during this study between March and July 2006 under different weather conditions. At first a simple method was developed to evaluate phase connectivity from a phase structure function. A model was also proposed to estimate a phase-structure function at longer time periods from a short time period. Finally, an available gap length was estimated using the model. Our results show that it is possible to estimate an available scan gap length by using a structure function at a time period of 10 s. This suggests that it is possible to control scan length and gap length dynamically in order to achieve the best performance of D-VLBI observations.
机译：连接从一个扫描到一个间隙的扫描之间的相位延迟的最大扫描间隙长度是Delta超长基线干涉测量法（D-VLBI）中的重要问题，并且受湿对流层引起的延迟波动的影响。最近，通过使用e-VLBI技术可以获得接近实时的条纹相位，该技术通过通过高速Internet连接站点来实现实时VLBI。这种实时VLBI增加了动态D-VLBI调度的可能性，该调度会根据日期的天气状况动态更改扫描和间隔长度。我们通过使用在鹿岛站，岐阜县站和小金井站（不是实时站）在S和X波段连续VLBI观测1-2小时获得的相结构函数，研究了这种可能性。在此研究期间，于2006年3月至7月期间，在不同的天气条件下进行了5次VLBI会议。首先，开发了一种简单的方法来根据相结构函数评估相连接性。还提出了一种模型，以从短时间段开始在较长时间段上估计相结构函数。最后，使用该模型估计可用间隙长度。我们的结果表明，可以通过使用结构函数在10 s的时间段内估算可用的扫描间隙长度。这表明可以动态控制扫描长度和间隙长度，以实现D-VLBI观测的最佳性能。

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