Volume 42 Issue 2
Mar.  2022
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Article Navigation >  Chinese Journal of Space Science  > 2022  >  42(2): 294-305
LU Guang, WANG Bing, CHEN Yao, WU Ji, YAN Jingye, WU Zhao, YAN Fabao, WU Lin. Simulations of the Antenna-shielding Effect of the Daocheng Solar Radio Telescope (DSRT) (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 294-305. DOI: 10.11728/cjss2022.02.210202017
Citation: LU Guang, WANG Bing, CHEN Yao, WU Ji, YAN Jingye, WU Zhao, YAN Fabao, WU Lin. Simulations of the Antenna-shielding Effect of the Daocheng Solar Radio Telescope (DSRT) (in Chinese). Chinese Journal of Space Science, 2022, 42(2): 294-305. DOI: 10.11728/cjss2022.02.210202017
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Simulations of the Antenna-shielding Effect of the Daocheng Solar Radio Telescope (DSRT)

doi: 10.11728/cjss2022.02.210202017
  • 1.

    Institute of Space Sciences, Shandong University, Weihai 264209

  • 2.

    National Space Science Center, Chinese Academy of Sciences, Beijing 100190

  • 3.

    State Key Laboratory of Space Weather, Beijing 100190

  • 4.

    University of Chinese Academy of Sciences, Beijing 100049

  • Received Date: 2021-02-02
  • Accepted Date: 2021-10-08
  • Rev Recd Date: 2021-10-29
    • Available Online: 2022-05-25
    Abstract
  • The Daocheng Solar Radio Telescope (DSRT) is a next-generation solar radio telescope funded by the Chinese Meridian Project–Phase II. DSRT is composed of 313 parabolic antennas with a diameter of six meters. The antennas are evenly distributed in a circle with a diameter of one kilometer. With the synthetic aperture imaging techniques, key factors determining the DSRT imaging quality are accurate calibrations of amplitude and phase of the received signals. Yet, under some circumstances, adjacent antennas of DSRT may shield each other, which will affects the amplitude and phase of the received signals and thus deteriorate imaging quality. In this study, such shielding effects of three- or two-antenna using the electromagnetic simulation software at frequencies of 300 MHz (λ=1 m) were simulated. The shielding effect in the three-antenna system is slightly worse than that in the two-antenna system. When the projected distance of adjacent antennas is taken to be –1λ, i.e., the most serious effect of shielding considered here, the horizontal and vertical gains of the system with two/three antennas decline by 0.6/0.6 dB and 0.3/0.4 dB, respectively, and the horizontal and vertical phase deviations are –3.3º/–3.871º and –1.744º/–2.244º, respectively, compared to the system with one antenna. Other situations with different projected shielding distances are also investigated. The results show that the two-antenna system can sufficiently describe the shielding effect associated with DSRT. Such effect should be properly taken into account when processing the future DSRT data so as to improve the data usage efficiency and imaging quality.

     

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