Scholarlink

<p>Tropospheric delay is the crucial modeling error in satellite laser ranging (SLR). The current tropospheric model for SLR neglects the Coriolis term, implicitly assuming vanishing horizontal winds. Here, we extend the Coriolis term based on quasi-hydrostatic approximations and validate the model with 3 years of ray-tracing and SLR-derived geodetic parameters. Omitting the Coriolis term induces a mean bias of&#xa0;–0.3&#xa0;mm in zenith hydrostatic delay, which is non-negligible when considering the 1&#xa0;mm accuracy requirement for the ITRF. The proposed model removes this bias. For the geodetic parameter, the proposed model shifts the terrestrial scale by + 0.07&#xa0;ppb, eliminating 46.7% of the SLR–Very Long Baseline Interferometry (VLBI) scale discrepancy. The incorporation of time-varying wind further reduces the annual amplitude of the Z-geocenter coordinate by 0.3&#xa0;mm, corresponding to a 7.3% decrease. Because tropospheric mismodeling directly impacts the fundamental geophysical parameters, we recommend adopting the extended tropospheric model for routine SLR analysis and provide site-specific wind parameters for the ILRS network.</p>

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

Extended zenith delay prediction for SLR based on quasi-hydrostatic approximations

  • 期刊论文

  • 发表日期：

    2026年6月23日

查看全文
  • Yuanchen Fu,
  • Keke Zhang,
  • Xingxing Li,
  • Yuxin Zheng,
  • Wei Zhang,
  • Yingzhe Li

摘要

Tropospheric delay is the crucial modeling error in satellite laser ranging (SLR). The current tropospheric model for SLR neglects the Coriolis term, implicitly assuming vanishing horizontal winds. Here, we extend the Coriolis term based on quasi-hydrostatic approximations and validate the model with 3 years of ray-tracing and SLR-derived geodetic parameters. Omitting the Coriolis term induces a mean bias of –0.3 mm in zenith hydrostatic delay, which is non-negligible when considering the 1 mm accuracy requirement for the ITRF. The proposed model removes this bias. For the geodetic parameter, the proposed model shifts the terrestrial scale by + 0.07 ppb, eliminating 46.7% of the SLR–Very Long Baseline Interferometry (VLBI) scale discrepancy. The incorporation of time-varying wind further reduces the annual amplitude of the Z-geocenter coordinate by 0.3 mm, corresponding to a 7.3% decrease. Because tropospheric mismodeling directly impacts the fundamental geophysical parameters, we recommend adopting the extended tropospheric model for routine SLR analysis and provide site-specific wind parameters for the ILRS network.