Scholarlink

<p>The BeiDou-3 navigation satellite system (BDS-3) employs inter-satellite link (ISL) technology to enable inter-satellite communication and ranging, providing new measurements for satellite precise orbit determination (POD) and clock estimation. The hardware delay is an important error source in BDS-3 ISL ranging measurements and is usually estimated as a satellite-dependent constant parameter. In this study, we propose a link-dependent ISL hardware delay estimation strategy in BDS-3 precise orbit and clock determination and compare it with satellite-dependent estimation. Using 31&#xa0;days of Ka-band ISL and L-band observations, we estimate the ISL receiving and transmitting hardware delays for 29 BDS-3 satellites and link-dependent delays for 726 one-way links. The results show that the standard deviations (STDs) of transmitting and receiving delays are 0.14&#xa0;ns and 0.15&#xa0;ns, respectively, and the STD of link-dependent delays is 0.19&#xa0;ns. By comparing the two types of delay estimates, we find that there are link-dependent biases in BDS-3 ISL ranging measurements for some satellite pairs, with the maximum value reaching 1 ns. In addition, the impact of delay estimation strategies on POD is evaluated in terms of ISL observation residuals and the precision of the determined satellite orbits and clock offsets. It is shown that the link-dependent delay estimation strategy can reduce the ISL observation residuals by more than 20% to 4.3&#xa0;cm. The 3D orbit boundary discontinuities (OBDs) of medium earth orbit (MEO), inclined geosynchronous orbit (IGSO), and geostationary earth orbit (GEO) satellites are reduced from 5.0, 9.9, and 19.9&#xa0;cm to 4.7, 8.7, and 18.6&#xa0;cm, respectively. This research provides new ideas for ISL hardware delay calibration and cross-check, and the proposed method can significantly reduce the impact of hardware delay on satellite orbit and clock determination.</p>

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Two strategies to estimate inter-satellite link hardware delays in BDS-3 precise orbit and clock determination: comparison and cross-check

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Tao Geng,
  • Kun Yan,
  • Xin Xie,
  • Chao Zhang,
  • Feng Zhang,
  • Xing Wang,
  • Hanlin Chen,
  • Qile Zhao,
  • Jingnan Liu

摘要

The BeiDou-3 navigation satellite system (BDS-3) employs inter-satellite link (ISL) technology to enable inter-satellite communication and ranging, providing new measurements for satellite precise orbit determination (POD) and clock estimation. The hardware delay is an important error source in BDS-3 ISL ranging measurements and is usually estimated as a satellite-dependent constant parameter. In this study, we propose a link-dependent ISL hardware delay estimation strategy in BDS-3 precise orbit and clock determination and compare it with satellite-dependent estimation. Using 31 days of Ka-band ISL and L-band observations, we estimate the ISL receiving and transmitting hardware delays for 29 BDS-3 satellites and link-dependent delays for 726 one-way links. The results show that the standard deviations (STDs) of transmitting and receiving delays are 0.14 ns and 0.15 ns, respectively, and the STD of link-dependent delays is 0.19 ns. By comparing the two types of delay estimates, we find that there are link-dependent biases in BDS-3 ISL ranging measurements for some satellite pairs, with the maximum value reaching 1 ns. In addition, the impact of delay estimation strategies on POD is evaluated in terms of ISL observation residuals and the precision of the determined satellite orbits and clock offsets. It is shown that the link-dependent delay estimation strategy can reduce the ISL observation residuals by more than 20% to 4.3 cm. The 3D orbit boundary discontinuities (OBDs) of medium earth orbit (MEO), inclined geosynchronous orbit (IGSO), and geostationary earth orbit (GEO) satellites are reduced from 5.0, 9.9, and 19.9 cm to 4.7, 8.7, and 18.6 cm, respectively. This research provides new ideas for ISL hardware delay calibration and cross-check, and the proposed method can significantly reduce the impact of hardware delay on satellite orbit and clock determination.