Evolutionary developments in antenna structural engineering

Levy, R.

doi:10.1109/aps.1992.221818

Cited by 2 publications

(2 citation statements)

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“…Generally speaking, the pointing error must be within 10% of the antenna's HPBW (i.e., half-power beamwidth) for large single-dish telescopes (Safak 1990). Shorter wavelengths require higher pointing accuracy for receiving radiation stably (Levy 1996;Gawronski 2007). Therefore, the pointing error of the CSO is 3″ (rms) for working at the submm wavelength.…”

Section: Introductionmentioning

confidence: 99%

An Improved Radio Pointing Model for SHARC II of the Caltech Submillimeter Observatory Telescope

Chen¹,

Wang²,

Zhou³

2022

PASP

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In this research, we develop a new method of upgrading the radio pointing model of an important instrument of the Caltech Submillimeter Observatory (CSO) telescope, i.e., the Submillimeter High Angular Resolution Camera II (SHARC II), by making three types of structural reconstruction of its existing model. First, the axial displacement of the secondary reflector of the telescope is introduced to the radio pointing model for SHARC II. Second, the multi-layer perceptron is applied for better describing higher-order terms in the radio pointing model, which are hard to be mathematically formulated. Third, a receding horizon modeling method is proposed to replace the time-dependent term in the existing model, for better reducing the negative impact of the time drift on the model’s accuracy. Results of numerical experiments and statistical significance analysis based on the real pointing data of SHARC II show that the reconstructed radio pointing model can improve the accuracy of estimating the pointing error, and the proposed method of upgrading the radio pointing model is effective. Considering that the CSO telescope will be moved from the old site at Maunakea, Hawaii to the new site at the Chajnantor Plateau in Chile, the proposed methods of upgrading the radio pointing model are expected to be employed for pointing correction after the telescope is refurbished at the new site.

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Section: Introductionmentioning

confidence: 99%

An Improved Radio Pointing Model for SHARC II of the Caltech Submillimeter Observatory Telescope

Chen¹,

Wang²,

Zhou³

2022

PASP

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“…So far the measurements of an active reflector mainly use the following three methods: The first is the rangefinder based technique (Levy 1996), like the laser metrology system adopted by the GBT which proved to be a successful design (Parker 1997). The data analysis is rather tedious since the final accuracy depends on the sophistication and volume of data, thus the time-response of this technique is on the order of hours for achieving a limiting accuracy of 100 microns.…”

Section: Introductionmentioning

confidence: 99%

An active reflector antenna using a laser angle metrology system

Zhang

Yang

et al. 2012

Res. Astron. Astrophys.

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Active reflector is one of the key technologies for constructing large telescopes, especially for the millimeter/sub-millimeter radio telescopes. This article introduces a new efficient laser angle metrology system for the active reflector antenna of the large radio telescopes, with a plenty of active reflector experiments mainly about the detecting precisions and the maintaining of the surface shape in real time, on the 65-meter radio telescope prototype constructed by Nanjing Institute of Astronomical Optics and Technology (NIAOT)⋆ . The test results indicate that the accuracy of the surface shape segmenting and maintaining is up to micron dimension, and the time-response can be of the order of minutes. Therefore, it is proved to be workable for the sub-millimeter radio telescopes.

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Evolutionary developments in antenna structural engineering

Cited by 2 publications

References 0 publications

An Improved Radio Pointing Model for SHARC II of the Caltech Submillimeter Observatory Telescope

An Improved Radio Pointing Model for SHARC II of the Caltech Submillimeter Observatory Telescope

An active reflector antenna using a laser angle metrology system

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