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Distributed image reconstruction method of radio interference array

An image reconstruction and distributed technology, applied in image data processing, 2D image generation, instruments, etc., can solve the problems of low operation efficiency and poor scalability.

Active Publication Date: 2018-04-06
SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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Problems solved by technology

[0004] What the present invention aims to solve is that the existing radio interference array image reconstruction method has the problems of low operating efficiency, poor scalability, and dependence on complex parameter settings. It provides a radio interference array distributed image reconstruction method, which can be used in astronomical The data can quickly reconstruct accurate astronomical images, and has good scalability (or scalability)

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  • Distributed image reconstruction method of radio interference array
  • Distributed image reconstruction method of radio interference array
  • Distributed image reconstruction method of radio interference array

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0046] The original data used in this example is the data obtained by Karl G. Jansky VLA observation of supernova remnant 3C391 and then calibrated by the general astronomical application software CASA. The data format is Measurement Set, and the file name is 3c391_ctm_mosaic_spw0.ms.

[0047] First, view the data in the file 3c391_ctm_mosaic_spw0.ms, select the field of view of the target radio source, that is, the field ID number is 0; use CASA software to separate the observation data related to the field of view of the target radio source from the file 3c391_ctm_mosaic_spw0.ms and create a sub File 3c391_field0.ms.

[0048] Then, read the sub-file 3c391_field0.ms to obtain the observation frequency channel, uvw data, the...

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Abstract

The invention discloses a distributed image reconstruction method of a radio interference array. An inverse problem of image reconstruction of the radio interference array is converted into a convex optimization problem under the equality constraint condition, an approximate ADMM (alternating direction method of multipliers) is used to solve the problem, and the quality of a finally reconstructedimage is higher than that via a present algorithm; data is segmented into multiple parts accurately and rapidly; and multiple calculation nodes are used for calculation, the parallel performance is higher, and the extensibility is high. The method can be used to obtain the reconstruction image directly needless of data post-processing steps, the dynamic range of the finally obtained image is wider, a celestial body of the extension structure is displayed more clearly, and the efficiency is higher compared with traditional methods.

Description

technical field [0001] The invention relates to the technical field of radio astronomical imaging, in particular to a distributed image reconstruction method of a radio interference array. Background technique [0002] The birth of the radio interferometer has greatly improved the sensitivity and resolution of radio observations, and this technology has effectively promoted the research and development of many directions in astronomy, cosmology and astrophysics. Driven by grand scientific goals, the scale of radio interference arrays in the 21st century has continued to expand, such as the Low Frequency Array (LOFAR) in the Netherlands. The core array has 24 units (array elements), and each unit is composed of 48 antennas. , the overseas array has 14 units, and each unit is composed of 96 antennas; the 21cm array built in the Xinjiang region of China has 81 units, and each unit is composed of 127 antennas; the Murchison wide-angle array (Murchison The Widefield Array (MWA) ...

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Application Information

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IPC IPC(8): G06T11/00G06T1/20
CPCG06T1/20G06T11/003
Inventor 劳保强安涛
Owner SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
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