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Radio astronomical telescope combining large-aperture spherical reflecting surface and phased array feed

An astronomical telescope, spherical reflection technology, used in antennas, electrical components, etc.

Active Publication Date: 2021-07-23
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The real-time control and long-term reliable operation of more than 2,000 actuators, and the safe operation of the main cable net of the FAST reflective surface in active deformation are very challenging

Method used

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  • Radio astronomical telescope combining large-aperture spherical reflecting surface and phased array feed
  • Radio astronomical telescope combining large-aperture spherical reflecting surface and phased array feed
  • Radio astronomical telescope combining large-aperture spherical reflecting surface and phased array feed

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] The specific implementation of a radio telescope combining a spherical reflector and a phased array feed (PAF) mainly includes the following aspects:

[0038] Build spherical reflective surfaces. Select a suitable karst depression as the construction site for the telescope, and carry out the necessary earthwork excavation and backfilling. Build the telescope main cable net and pull down cable, and adjust the cable net nodes to the designed sphere. Lay a single-layer spherical reflective surface panel on the cable net, and make fine adjustments to the surface shape of the main reflective surface.

[0039] Feed support system. Build several tall towers and feed cabin cable drive systems around the reflecting surface. Use the feed support platform with a two-axis rotation adjustment mechanism developed by the FAST project.

[0040] Phased array feed ...

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Abstract

The invention discloses a radio astronomical telescope combining a large-aperture spherical reflecting surface and a phased array feed. The radio astronomical telescope is characterized in that the radio astronomical telescope comprises a spherical reflecting surface which is used for converging incident plane waves through reflection; a phased array feed which is mounted on a feed supporting system and is used for receiving the electromagnetic waves converged by the spherical reflecting surface and sending a received signal to a data processing terminal; and the data processing terminal which is used for calibration of the phased array feed and calculation and data storage required by data processing of the received signal. According to the invention, the spherical reflecting surface is the neutral surface of the FAST, a PAF is composed of 7225 feed units with the size of about 10 m * 10 m, and when the illumination gain of each feed unit at 56.4 degrees is 4.4 dB and the unit spacing is 12 cm, the obtained efficiency is higher than the efficiency of the FAST using a single beam. According to the scheme, a field of view of 2 * 2 square degree can be obtained, and the field of view is larger than the current instantaneous field of view of the FAST.

Description

technical field [0001] The invention belongs to the technical field of radio astronomical telescopes, and relates to a radio astronomical telescope, in particular to a radio astronomical telescope which utilizes a combination of a large-diameter spherical reflective surface and a phase array feed source to achieve high sensitivity and a large field of view. Background technique [0002] Since the birth of radio astronomy in the 1930s, radio astronomy telescopes have made continuous breakthroughs in the performance of both sensitivity and resolution. In terms of resolution, the resolution of Very Long Baseline Interferometry (VLBI) in radio astronomy is the highest among all kinds of astronomical observations. Its longest baseline has exceeded the diameter of the earth due to the addition of space antennas. In terms of sensitivity, the current single-antenna telescope with the largest aperture is my country's Five-hundred-meter Aperture Spherical radioTelescope-FAST. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/16H01Q19/12
CPCH01Q15/16H01Q19/12
Inventor 王君朱岩金乘进彭勃
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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