Development of active surface technology of large radio telescope antennas

Wang, Congsi; Lan, Xiao; Xiang, Binbin; Wang, Wei; Xu, Qian; Jiang, Li; Wang, Na; Duan, Baoyan

doi:10.1360/sspma2017-00011

Cited by 9 publications

(7 citation statements)

References 5 publications

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“…Te large radio telescopes in service in the world, in addition to those mentioned in the introduction, also include the Green Bank Telescope (GBT, 100 m × 110 m aperture, located in West Virginia, USA), the Sardinia Radio Telescope (SRT, 64 m aperture, located in Italy), Nobeyama Telescope (45 m aperture, located in Japan), the Lovell Telescope (76 m aperture, located in UK), Parkes Radio Telescope (64 m aperture, located in Australia), Yebes Telescope (40 m diameter, located in Spain), as well as the 26 m Nanshan Telescope located in Urumqi, Xinjiang, China, the 40 m Telescope located in Kunming, Yunnan, and the 50 m Telescope located in Miyun, Beijing, etc. Tese telescopes have been summarized in detail in [6,7,9]; thus the authors give no further elaborations. In addition, the Arecibo Telescope (305 m aperture, located in the U.S. island of Puerto Rico), the second largest singledish fxed radio telescope in the world, crashed due to the suspended electrical receiving part after nearly 60 years of service, and the main body of the refector surface was also damaged, this telescope has ofcially retired at the end of 2020.…”

Section: Development Trends Of Radio Telescopes In Recent Yearsmentioning

confidence: 99%

“…When the wind direction and wind speed change, the control system has no time to adjust its control strategy, so the control system cannot compensate for the pointing error caused by wind disturbance efectively. Terefore, a threshold-based control strategy will be adopted in the future to be equivalent to the interference of the wind on the antenna for a period of time [7,139]. In other words, for the wind over a period of time, an adjustment amount is used.…”

Section: Wind-resistant Servo Control Algorithmmentioning

confidence: 99%

“…When making astronomical observations, celestial objects can not only be observed in visible light but also radiate radio waves [6]. As the device for receiving these radio waves, a large antenna body is the most obvious feature of the radio telescope [7]. As a typical electromechanical coupling device, the antenna body of a radio telescope consists of two parts, electrical and mechanical.…”

Section: Introductionmentioning

confidence: 99%

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Progress and Challenges in Electromechanical Coupling of Radio Telescopes

Yan

Xue

et al. 2022

International Journal of Antennas and Propagation

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Radio astronomy is a discipline of dynamics and wonders. The vast universe has many secrets to unravel. As one of the important facilities in this discipline, radio telescopes play a key role in collecting astronomical data and unraveling mysteries. With the demand of radio astronomy for a higher frequency, wider bandwidth, higher gain, and higher pointing accuracy, the aperture of the radio telescope is gradually increasing, and its electrical performance and structure have become tightly coupled. Therefore, how to ensure the stable and efficient operation of the telescope for the long-term operation has become the urgent demand for large aperture high-performance radio telescopes. Therefore, this paper firstly makes a comparison of the overall condition of large radio telescopes in nearly a decade that are both constructed and operated, including the progress of radio telescopes that are being constructed and the planning for construction. Then, systematically summarized the latest research progress of electromechanical coupling technology from 3 aspects of connotation and application of electromechanical coupling, and performance guarantee under slowly varying load and performance guarantee under rapidly varying load from the perspectives of design, manufacturing, and observation operating. Lastly, the future research direction of electromechanical coupling technology is pointed out according to the development trend of radio astronomy.

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Section: Development Trends Of Radio Telescopes In Recent Yearsmentioning

confidence: 99%

Section: Wind-resistant Servo Control Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Progress and Challenges in Electromechanical Coupling of Radio Telescopes

Yan

Xue

et al. 2022

International Journal of Antennas and Propagation

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“…110 m口径全向可动射电望远镜(也称奇台射电望远镜, QiTai radio Telescope, QTT)是一架口径为110 m 全可转动的通用型射电望远镜, 主要用于射电天文观测, 工作波段覆盖150 MHz-115 GHz, 波长覆盖 100 cm-3 mm [1] . [3] 对天线结构进行优化设计来减小"保型变形"误差外, 还将采用主动补偿技术 [4] , 如主动主反射面调整 [5,6] 和副面位置调整 [7,8] 等, 来进一步减小结构变形.…”

Section: 引言unclassified

Design and test of a precision positioning actuator for QTT

Xiang

Peng²,

Wang

et al. 2019

Sci. Sin.-Phys. Mech. Astron.

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Design of a test structure based on chevron-shaped thermal actuator for in-situ measurement of the fracture strength of MEMS thin films Nanotechnology and Precision Engineering 2, 163 (2019); Analysis on the positioning precision of CAPS Science in China Series G-Physics, Mechanics & Astronomy 52, 328 (2009); Actuator characterization of a man-portable precision maneuver concept Defence Technology 10, 141 (2014); Modeling and experiments of a nano-positioning and high frequency scanning piezoelectric platform based on function module actuator SCIENCE CHINA Technological Sciences QTT高精度位移促动器设计与测试

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“…The surface accuracy is not only affected by panel manufacture and assembly accuracy, but also by complex environmental factors such as its own gravity, temperature, and wind. In the process of observing the radio source, the panel shape of antenna will change in real time due to the gravity deformation of the antenna (Wang et al 2017). It is necessary to adopt the adjustable main reflector system to regulate the main reflector shape of the antenna in real time according to the observation elevation angle at high frequencies (Greve & Karcher 2009;Wang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Research on the panel adjustment method of an active main reflector for a large radio telescope

Sun

Wang

et al. 2021

Res. Astron. Astrophys.

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The surface accuracy of a large parabolic antenna is an important indicator to evaluate the quality of the antenna. It not only directly affects the antenna’s aperture efficiency, thereby determining the shortest wavelength that the antenna can work, but also affects the main lobe width and side lobe structure of the antenna pattern. Microwave holography is an important method for parabolic antenna profile detection. In this article we adopt a new algorithm to adjust the panels for the large radio telescope with an active main reflector through the TM65 m antenna’s aperture phase profile. The panels of the TM65 m radio telescope is in a radial pattern with 14 rings. Each corner of the panel is fixed on the screw of the actuator to move up and down, and the adjacent corners of the four panels share an actuator. We use the method of plane fitting to calculate the adjustment value of every panel’s corner. But one actuator, which simultaneously controls the common corner of the adjacent panels, will have different adjustment values according to the different plane fitting equation based on adjacent panels. In this paper, the adjustment value of the adjacent panels’crosspoints are constrained to be equal to the constraint condition to calculate each actuator’s adjustment value of the TM65 m radio telescope. Through multiple adjustments and application of the new algorithms, the accuracy of the TM65 m antenna reflector profile has been improved from the original 0.28 mm to the current 0.19 mm.

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Development of active surface technology of large radio telescope antennas

Cited by 9 publications

References 5 publications

Progress and Challenges in Electromechanical Coupling of Radio Telescopes

Progress and Challenges in Electromechanical Coupling of Radio Telescopes

Design and test of a precision positioning actuator for QTT

Research on the panel adjustment method of an active main reflector for a large radio telescope

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