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This study introduces a refined method for accurately determining the Invariant Point (IVP) of Very Long Baseline Interferometry (VLBI) antennas through constrained optimization, emphasizing the critical role of axis-offset sign conditions. Optical surveying techniques, commonly used to determine IVPs, inherently involve measurement limitations and observational errors, which may lead to biased estimations of the Azimuth (AZ) and Elevation (EL) axes. To mitigate these biases, we implement physical geometric constraints, including equal-radius conditions for target circles and equal inter-circle distances to ensure consistency across multiple Azimuth positions. Our method specifically incorporates a novel approach for determining the axis-offset sign, which significantly influences VLBI delay estimations. To validate the effectiveness of our method, we conducted numerical simulations using a virtual model with a predefined IVP and axis configuration. Realistic measurement noise was introduced to generate synthetic observational data. Simulation results clearly show that our constrained optimization approach substantially reduces bias and variance in IVP estimation compared to the geometric method proposed in our previous work. Specifically, the proposed method reduced the 3D RMSE of IVP estimation by approximately 40% (e.g., from 1.239 mm to 0.736 mm at 50 m observation distance) and the Interquartile Range (IQR) Error Norm by over 60% (e.g., from 0.949 mm to 0.343 mm at 50 m observation distance). The proposed method’s explicit handling of axis-offset sign conditions demonstrates originality and practical applicability, providing robust and reliable antenna reference point determination. Furthermore, we successfully applied this refined method to the Korean VLBI Network (KVN) Pyeongchang VLBI antenna, demonstrating practical effectiveness in operational geodetic VLBI environments. This advancement contributes to enhanced precision in International Terrestrial Reference Frame (ITRF) realization through improved VLBI station positioning.

권호기사

권호기사 목록 테이블로 기사명, 저자명, 페이지, 원문, 기사목차 순으로 되어있습니다.
기사명 저자명 페이지 원문 목차
MulGuisin, a topological network finder and its performance on galaxy clustering Young Ju, Inkyu Park, Cristiano G. Sabiu, Sungwook E. Hong p. 1-15
Enhanced imaging of M 87* : simulations with the EHT and extended-KVN Ilje Cho, Jongho Park, Do-Young Byun, Taehyun Jung, Lindy Blackburn, Freek Roelofs, Andrew Chael, Dominic W. Pesce, Sheperd S. Doeleman, Sara Issaoun ... [et al.] p. 17-29
High-cadence optical observations of a normal type Ia SN 2018kp from its early phase Gu Lim, Changsu Choi, Myungshin Im, Sung-Chul Yoon, Gregory S.H. Paek, Sophia Kim, Joonho Kim, Hyun-Il Sung, Mankeun Jeong, Bomi Park ... [et al.] p. 31-42
Prospect of deriving galaxy properties through machine learning : application to medium-band data from the 7DT Hosung Lim, Hyunjin Shim, Myungshin Im, Ji Hoon Kim, Seong-Kook Lee, Gregory S.H. Paek, Eunhee Ko, Dohyeong Kim p. 43-53
Solar cycle dependence of NOAA space weather scale frequencies Daeil Kim, Yong-Jae Moon, Hyun-Jin Jeong, Jihyeon Son p. 55-61
Calibration of the fast imaging solar spectrograph : fringe reduction using the wavelet transform Juhyung Kang, Donguk Song, Jongchul Chae, Eun-Kyung Lim, Masahito Kubo p. 63-70
Hα flux extraction from continuum-dominated sources using a simplified three-filter method Hojae Ahn, Hyunjin Shim, Wonseok Kang, Myungshin Im, Soojong Pak p. 71-79
Near-infrared spectroscopy with IGRINS-2 for studying multiple stellar populations in globular clusters Dongwook Lim, Young-Wook Lee, Sol Yun, Young Sun Lee, Sang-Hyun Chun, Heeyoung Oh, Jae-Joon Lee, Chan Park, Sanghyuk Kim, Ueejeong Jeong ... [et al.] p. 81-92
SDSS J134313.15+364457.5 : forming compact elliptical through the merger Daya Nidhi Chhatkuli, Sanjaya Paudel, Binil Aryal, Binod Adhikari, Nau Raj Pokhrel, Rajendra Adhikari p. 93-98
(The) low mass ratio overcontact binary GV leonis and its circumbinary companion Jae Woo Lee, Jang-Ho Park, Mi-Hwa Song, Min-Ji Jeong, Chun-Hwey Kim p. 99-110
Near- to mid-infrared spectroscopic study of ice analysis using the AKARI/IRC and Spitzer/IRS spectra Jaeyeong Kim, Jeong-Eun Lee, Chul-Hwan Kim, Woong-Seob Jeong, Yao-Lun Yang p. 111-129
Infrared variability of carbon stars in the LMC observed with NEOWISE-R Kyung-Won Suh p. 131-143
Assessing minimum signal-to-noise ratio for detecting planet signal in BOES spectra Berfin Toğay, Young Sun Lee, Yeon-Ho Choi, Changwoo Kye, Jae-Joon Lee, Sol Yun p. 145-161
Statistical analysis of elemental composition in solar energetic particle events and its association with ground level enhancements using ACE/SIS observations (1997–2023) Jongil Jung, Suyeon Oh, Young-Sil Kwak, Yu Yi p. 163-173
Challan : solar full-disk imaging-spectroscopic telescope using the drift-scanning technique Heesu Yang, Maria S. Madjarska, Donguk Song, Hannah Kwak, Sung-Hong Park, Eun-Kyung Lim, Sujin Kim, Su-Chan Bong, Yeon-Han Kim, Seonghwan Choi p. 175-183
Structures and properties of fan-shaped jets : Hα dark blobs and transparent regions Heesu Yang, Maria S. Madjarska, Eun-Kyung Lim, Daniel Nóbrega-Siverio, Klaus Galsgaard p. 185-195
(A) method to predict the likelihood and magnitudes of solar flares for a given solar active region Daye Lim, Yong-Jae Moon, Hyun-Jin Jeong p. 197-207
(The) outbursting YSOs catalogue (OYCAT) Carlos Contreras Peña, Jeong-Eun Lee, Gregory Herczeg, Doug Johnstone, Péter Ábrahám, Simone Antoniucci, Marc Audard, Mizna Ashraf, Giseon Baek, Alessio Caratti o Garatti ... [et al.] p. 209-230
YSO variability in the W51 star-forming region Mi-Ryang Kim, Jeong-Eun Lee, Carlos Contreras Peña, Gregory Herczeg, Doug Johnstone, Miju Kang p. 231-242
Water snowline in young stellar objects with various density structures using radiative transfer models Young-Jun Kim, Jeong-Eun Lee, Giseon Baek, Seokho Lee p. 243-254
Development of a wide-IF SIS mixer for the 150 GHz heterodyne receiver Jiman Kang, Jung-Won Lee, Wei-Chun Lu, Ming-Jye Wang p. 255-264
Refining VLBI invariant point determination with constrained optimization : application to KVN Pyeongchang radio telescope Sung-Moon Yoo, Taehyun Jung, Sung-Mo Lee, Jungho Cho p. 265-280
Properties of solar, interplanetary, and geomagnetic index in active days Heon-Young Chang p. 281-290
On : Orbit Calibration of Danuri/PolCam. I. Geometric Calibration 백길호, 김성수, 정민섭, 최영준 p. 291-303
An Inversion Method for Deriving Physical Properties of a Subsurface Magnetic Field from Surface Magnetic Field Evolution. II. Application to Observed Data Tetsuya Magara, 이시백, 장연우, 손동희 p. 305-313

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