IPS observation system for the Miyun 50 m radio telescope and its commissioning observation

Zhu, Xinying; Zhang, Xizhen; Kong, Deqing; Qu, Huipeng

doi:10.1088/1674-4527/12/7/013

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…At the beginning of this century, a series of IPS studies were also carried out in China (Zhu et al 2012;Liu et al 2021), which were all based on ground observation settings to observe natural radio sources. With the successful launch of the Tianwen-1 deep space probe and the advancement of more deep space missions, it is urgent to establish a systematic data processing method for IPS research using deep space probes.…”

Section: Introductionmentioning

confidence: 99%

A New Method of Frequency Fluctuation Estimation and IPS Processing Results Based on the Downlink Signal of Tianwen-1

Liu

Kong

Liu³

et al. 2023

Res. Astron. Astrophys.

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The radio-occultation observations taking by Tianwen-1 is aiming to study the properties of solar wind. A new method of frequency fluctuation (FF) estimation is presented for processing the down-link signals of Tianwen-1 during the occultation period to study the properties of the coronal plasma at the heliocentric distances of 4.48 to 19 R⊙. Considering low signal-to-noise ratio as well as the phase fluctuation phenomena caused by solar activity, a Kalman based on polynomial prediction methods is proposed to avoid the Phase locked loop (PLL) loss lock. And a new detrend methods based on multi-level iteration correction is proposed to estimate Doppler shift to get more accurate power density spectra of FF in the low frequency region. The data analyze procedure is used to get the properties of solar corona during the occultation. The method was finally verified at the point when solar offset is 5.7 R⊙, frequency tracking was successfully performed on data with a carrier-to-noise ratio of about 28 dBHz. The density spectra obtained by the improved method are basically the same when frequency is greater than 2mHz, the uncertainty in the result of the RMS of the FF obtained by removing the trend term with different order polynomials is less than 3.3%. And the data without eliminating interference shows a large error for different detrending orders, which justifies the need for the improved approach.Finally, the frequency fluctuation results combined with the information of intensity fluctuation obtained by the new method are compared with the results of the integrated Space Weather Analysis (iSWA) system and theoretical formula, which verifies that the processing results in this paper have a certain degree of credibility.

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Section: Introductionmentioning

confidence: 99%

A New Method of Frequency Fluctuation Estimation and IPS Processing Results Based on the Downlink Signal of Tianwen-1

Liu

Kong

Liu³

et al. 2023

Res. Astron. Astrophys.

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“…The bandwidths of the four central frequencies are 40, 40, 300 and 800 MHz respectively. This IPS facility aimed to obtain the solar wind velocity and scintillation index information for space weather forecasting (Zhu et al 2012). In the near future, an IPS facility will be built in Inner Mongolia for the National Meridian Project 2 (Yan et al 2018), which is a three-station system with observing frequencies centered at 327 MHz, 654 MHz, and 1.4 GHz.…”

Section: Introductionmentioning

confidence: 99%

A Pilot Study of Interplanetary Scintillation with FAST

Liu,

Peng,

et al. 2021

Preprint

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Observations of Interplanetary Scintillation (IPS) are an efficient remote-sensing method to study the solar wind and inner heliosphere. From 2016 to 2018, some distinctive observations of IPS sources like 3C 286 and 3C 279 were accomplished with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), the largest single-dish telescope in the world. Due to the 270-1620 MHz wide frequency coverage of the Ultra-Wideband (UWB) receiver, one can use both single-frequency and dual-frequency analyses to determine the projected velocity of the solar wind. Moreover, based on the extraordinary sensitivity owing to the large collecting surface area of FAST, we can observe weak IPS signals. With the advantages of both the wider frequency coverage and high sensitivity, also with our radio frequency interference (RFI) mitigation strategy and an optimized model-fitting method developed, in this paper, we analyze the fitting confidence intervals of the solar wind velocity, and present some preliminary results achieved using FAST, which points to the current FAST system being highly capable of carrying out observations of IPS.

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“…In the field of radio astronomy in China, the Fivehundred-meter Aperture Spherical radio Telescope (FAST) facility (Nan 2005;Gan & Jin 2010) and the planned Qitai Telescope (QTT) with a 110 m diameter (Xu & Wang 2016;Wang 2014) are both important means to study major topics such as planet formation, black hole physics and dark energy in the universe. In order to further improve the level of science and technology, the construction of the China Array of Radio Telescopes (CHINA-ART) proposed in recent years can achieve leap-forward development of Chinese astronomical science in many fields such as astrometry and deep space navigation (Han 2011;Zhu et al 2012;Lesovoi et al 2014). With the development of science and technology, large radio telescopes are playing an increasingly important role.…”

Section: Introductionmentioning

confidence: 99%

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

Yan

Zheng

Rui

2021

Res. Astron. Astrophys.

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The self-weight of a large fully-steerable radio telescope is one of the important factors affecting its performance. In the existing reflector system scheme, the problem of surface accuracy caused by its large and heavy structure has seriously restricted the application and implementation of large radio telescopes. Therefore, a new mesh structure scheme for a large fully-steerable radio telescope reflector is proposed in this paper. This scheme is based on a homogenized mesh back-up structure in the form of a quasi-geodesic grid and regular quasi-tri-prism or tetrahedron, which can significantly reduce the structural complexity and self-weight of the reflector under the condition that the reflector can meet the desired performance requirements. Finally, the feasibility and rationality of the scheme are evaluated by numerical simulation analysis, which has significant advantages and provides a new design for the reflector of a large fully-steerable radio telescope.

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IPS observation system for the Miyun 50 m radio telescope and its commissioning observation

Cited by 6 publications

References 15 publications

A New Method of Frequency Fluctuation Estimation and IPS Processing Results Based on the Downlink Signal of Tianwen-1

A New Method of Frequency Fluctuation Estimation and IPS Processing Results Based on the Downlink Signal of Tianwen-1

A Pilot Study of Interplanetary Scintillation with FAST

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

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