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## Vision — Software for Visualizing the Results of VLBI Data Correlation Processing

Transactions of IAA RAS, issue 58, 30–35 (2021)

Keywords: RASFX, residual delay, fringe, correlation processing, visualization, VLBI data, postprocessing

### Abstract

After the correlation processing of very long baseline interferometry (VLBI) data is done, it is necessary to analyze the results. The surface of a fringe and its main parameters, as well as spectral characteristics of a signal path, can be conveniently presented in a user friendly graphical form. Today, there are several special software packages which are used to calculate parameters of the fringe. But such packages do not provide information about the fringe surface and stability of its parameters during the observation time. After using such software, there is a necessity to visualize the results of correlation processing and evaluate fringe parameters. In order to analyze the results of correlation processing, we have elaborated multifunctional post processing software for generating user friendly graphical reports based on RASFX correlator output data. The authors used methods of imperative programming in Python for software elaboration, as well as mathematical statistics for the fringe parameters calculation and visualization. The algorithms and mathematical methods are presented. The elaborated multifunctional software called Vision can be used for generating reports on VLBI observation sessions by the RASFX correlation processing results. Vision reads RASFX output data and calculates parameters of a fringe such as residual delay, delay rate and signal to noise ratio (SNR). Vision also provides the ability to estimate fringe phase and SNR within individual scans of an observation session. The output of Vision is a PDF report on the observation session with calculated parameters and figures. These reports provide all data needed to analyze the results of correlation processing for each frequency channel during each scan. It is also possible to generate reports based on bandwidth synthesis results.

### Citation

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M. S. Zorin, A. S. Kumeyko, V. O. Ken. Vision — Software for Visualizing the Results of VLBI Data Correlation Processing // Transactions of IAA RAS. — 2021. — Issue 58. — P. 30–35. @article{zorin2021, abstract = {After the correlation processing of very long baseline interferometry (VLBI) data is done, it is necessary to analyze the results. The surface of a fringe and its main parameters, as well as spectral characteristics of a signal path, can be conveniently presented in a user friendly graphical form. Today, there are several special software packages which are used to calculate parameters of the fringe. But such packages do not provide information about the fringe surface and stability of its parameters during the observation time. After using such software, there is a necessity to visualize the results of correlation processing and evaluate fringe parameters. In order to analyze the results of correlation processing, we have elaborated multifunctional post processing software for generating user friendly graphical reports based on RASFX correlator output data. The authors used methods of imperative programming in Python for software elaboration, as well as mathematical statistics for the fringe parameters calculation and visualization. The algorithms and mathematical methods are presented. The elaborated multifunctional software called Vision can be used for generating reports on VLBI observation sessions by the RASFX correlation processing results. Vision reads RASFX output data and calculates parameters of a fringe such as residual delay, delay rate and signal to noise ratio (SNR). Vision also provides the ability to estimate fringe phase and SNR within individual scans of an observation session. The output of Vision is a PDF report on the observation session with calculated parameters and figures. These reports provide all data needed to analyze the results of correlation processing for each frequency channel during each scan. It is also possible to generate reports based on bandwidth synthesis results.}, author = {M.~S. Zorin and A.~S. Kumeyko and V.~O. Ken}, doi = {10.32876/ApplAstron.58.30-35}, issue = {58}, journal = {Transactions of IAA RAS}, keyword = {RASFX, residual delay, fringe, correlation processing, visualization, VLBI data, postprocessing}, pages = {30--35}, title = {Vision — Software for Visualizing the Results of VLBI Data Correlation Processing}, url = {http://iaaras.ru/en/library/paper/2095/}, year = {2021} } TY - JOUR TI - Vision — Software for Visualizing the Results of VLBI Data Correlation Processing AU - Zorin, M. S. AU - Kumeyko, A. S. AU - Ken, V. O. PY - 2021 T2 - Transactions of IAA RAS IS - 58 SP - 30 AB - After the correlation processing of very long baseline interferometry (VLBI) data is done, it is necessary to analyze the results. The surface of a fringe and its main parameters, as well as spectral characteristics of a signal path, can be conveniently presented in a user friendly graphical form. Today, there are several special software packages which are used to calculate parameters of the fringe. But such packages do not provide information about the fringe surface and stability of its parameters during the observation time. After using such software, there is a necessity to visualize the results of correlation processing and evaluate fringe parameters. In order to analyze the results of correlation processing, we have elaborated multifunctional post processing software for generating user friendly graphical reports based on RASFX correlator output data. The authors used methods of imperative programming in Python for software elaboration, as well as mathematical statistics for the fringe parameters calculation and visualization. The algorithms and mathematical methods are presented. The elaborated multifunctional software called Vision can be used for generating reports on VLBI observation sessions by the RASFX correlation processing results. Vision reads RASFX output data and calculates parameters of a fringe such as residual delay, delay rate and signal to noise ratio (SNR). Vision also provides the ability to estimate fringe phase and SNR within individual scans of an observation session. The output of Vision is a PDF report on the observation session with calculated parameters and figures. These reports provide all data needed to analyze the results of correlation processing for each frequency channel during each scan. It is also possible to generate reports based on bandwidth synthesis results. DO - 10.32876/ApplAstron.58.30-35 UR - http://iaaras.ru/en/library/paper/2095/ ER -