This study examines the new prospects that arise when classical Very Long Baseline Interferometry (VLBI) expands its tapestry to include satellite observations, which comprise precise orbit determination (POD), potentially accessing Earth’s origin, and low-degree gravity field coefficients. To assess these prospects, we schedule and simulate VLBI observations to one Galileo-like satellite, in addition to radio sources from a 20-station network comprising legacy, current, and future VLBI Global Observing System (VGOS) stations spanning three years of observation. The proportion of satellite observations is regulated at around 30% of the total observations, which does not exacerbate the products determined by classical VLBI as assessed by our previous studies. The mismodelling of Solar Radiation Pressure (SRP) is introduced in our study. In this investigation, we focus on the assessment of the recovered orbit from POD, geocenter coordinates, and their correlations with SRP parameters. Based on our simulation approach, the root mean square (RMS) value of the differences between the recovered orbit w.r.t. a priori orbit was computed. The RMS value of an orbit comparison in the radial direction is recovered at a cm level, where the RMS value increases at low beta angles of the orbital plane. To examine the geocenter from VLBI, the scenario entails imposed No-Net-Translation and -Rotation (NNT/NNR) constraints to achieve a minimally constrained solution. The estimated geocenter coordinates represent corrections in the X and Y  coordinates at the millimeter level and in the Z coordinates at the centimeter level. In addition, strong periodically varying correlations between the Z geocenter coordinate and ECOM-2(9) parameters such as \(B_C\) , \(B_S\) , \(D_0\) , \(D_{2C}\) , and \(D_{2S}\) were also observed. The Z-coordinate and its correlations with ECOM-2(9) parameters show a strong relationship with the beta angle of the orbital plane, which is the angle between the Sun vector to geocenter and the orbital plane. Additionally, for the first time, we present low-degree gravity field coefficients estimated using simulated VLBI observations, employing a special parameterization. Preliminary findings demonstrate good agreement with the corresponding model values, assuming a perfect orbit.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Exploring New Prospects by Incorporating Satellite Observations into VLBI

  • Shrishail Raut,
  • Susanne Glaser,
  • Patrick Schreiner,
  • Karl Hans Neumayer,
  • Harald Schuh

摘要

This study examines the new prospects that arise when classical Very Long Baseline Interferometry (VLBI) expands its tapestry to include satellite observations, which comprise precise orbit determination (POD), potentially accessing Earth’s origin, and low-degree gravity field coefficients. To assess these prospects, we schedule and simulate VLBI observations to one Galileo-like satellite, in addition to radio sources from a 20-station network comprising legacy, current, and future VLBI Global Observing System (VGOS) stations spanning three years of observation. The proportion of satellite observations is regulated at around 30% of the total observations, which does not exacerbate the products determined by classical VLBI as assessed by our previous studies. The mismodelling of Solar Radiation Pressure (SRP) is introduced in our study. In this investigation, we focus on the assessment of the recovered orbit from POD, geocenter coordinates, and their correlations with SRP parameters. Based on our simulation approach, the root mean square (RMS) value of the differences between the recovered orbit w.r.t. a priori orbit was computed. The RMS value of an orbit comparison in the radial direction is recovered at a cm level, where the RMS value increases at low beta angles of the orbital plane. To examine the geocenter from VLBI, the scenario entails imposed No-Net-Translation and -Rotation (NNT/NNR) constraints to achieve a minimally constrained solution. The estimated geocenter coordinates represent corrections in the X and Y  coordinates at the millimeter level and in the Z coordinates at the centimeter level. In addition, strong periodically varying correlations between the Z geocenter coordinate and ECOM-2(9) parameters such as \(B_C\) , \(B_S\) , \(D_0\) , \(D_{2C}\) , and \(D_{2S}\) were also observed. The Z-coordinate and its correlations with ECOM-2(9) parameters show a strong relationship with the beta angle of the orbital plane, which is the angle between the Sun vector to geocenter and the orbital plane. Additionally, for the first time, we present low-degree gravity field coefficients estimated using simulated VLBI observations, employing a special parameterization. Preliminary findings demonstrate good agreement with the corresponding model values, assuming a perfect orbit.