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<p>To accurately localize ground electromagnetic interference (EMI) interrupting satellite communications, it is important to compensate for ionosphere delays. The accuracy of the ionosphere delay estimation depends on the ionosphere conditions, which are subject to estimation errors and lags. In this paper, we propose a single-satellite scheme that estimates the slant total electron content (STEC) value, on which the ionospheric delay depends linearly in the first order, using a small number of reference emitters. The reference emitters are placed near the region of interest for the convenience and effectiveness of deployment and operation. STEC interpolation is considered to estimate the STEC results for any position around the region of interest. Since a coarse estimation of STEC can be computed using NeQuick-G utilizing the broadcast global parameters from the Galileo system, we show that interpolating the STEC difference due to calibration errors, computed between the actual STEC and the computed counterpart based on the broadcast coefficients, over the region of interest provides significantly improved STEC estimation performance.</p>

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STEC calibration exploiting interpolation for satellite-based ground emitter localization

  • 期刊论文

  • 发表日期：

    2025年9月16日

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  • Yimin D. Zhang,
  • Yanwu Ding,
  • Dan Shen,
  • Khanh Pham,
  • Genshe Chen

摘要

To accurately localize ground electromagnetic interference (EMI) interrupting satellite communications, it is important to compensate for ionosphere delays. The accuracy of the ionosphere delay estimation depends on the ionosphere conditions, which are subject to estimation errors and lags. In this paper, we propose a single-satellite scheme that estimates the slant total electron content (STEC) value, on which the ionospheric delay depends linearly in the first order, using a small number of reference emitters. The reference emitters are placed near the region of interest for the convenience and effectiveness of deployment and operation. STEC interpolation is considered to estimate the STEC results for any position around the region of interest. Since a coarse estimation of STEC can be computed using NeQuick-G utilizing the broadcast global parameters from the Galileo system, we show that interpolating the STEC difference due to calibration errors, computed between the actual STEC and the computed counterpart based on the broadcast coefficients, over the region of interest provides significantly improved STEC estimation performance.