Scholarlink

<p>The article presents the results of two radio engineering experiments on measuring the parameters of the Earth’s gravity field using signals from low-orbit spacecraft and global navigation satellite systems. The authors experimentally validated a&#xa0;method for measuring gravitational acceleration using signals from a&#xa0;low-orbit satellite, as well as a&#xa0;method for measuring the current geoid height by means of an onboard bistatic radar system using signals from global navigation satellite systems, which had been previously proposed by the authors. The first experiment used the signal of a&#xa0;small low-orbit RS-44 (DOSAAF-85) spacecraft with a&#xa0;frequency of about 2.3 GHz, while the second experiment used primary measurement data from a&#xa0;bistatic radar system installed on board a&#xa0;foreign CYGNSS satellite. After the processing of measurement results obtained in the first experiment, the standard deviation of the measured gravitational acceleration of the low-orbit spacecraft from the model-derived values was found to amount to 6.3 mGal. It is currently impossible to measure gravitational acceleration by means of mechanical gravimeters on board the satellite due to weightlessness. In the second experiment, the measured and model-derived geoid heights differ by 13.3 cm, which meets the current requirements. In contrast to the conventional method of satellite radio altimetry, the method for measuring the current geoid height using an onboard bistatic radar system provides a&#xa0;means to obtain up to 60&#xa0;reflected signals and measured heights simultaneously. The experimental results can be used to refine the Earth’s gravity field model in remote territories and water areas, including the Arctic region.</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

Experimental validation of space radio engineering methods for measuring Earth’s gravity field parameters

  • 期刊论文

  • 发表日期：

    2025年5月1日

查看全文
  • Vyacheslav F. Fateev,
  • Ruslan A. Davlatov,
  • Vladislav P. Lopatin

摘要

The article presents the results of two radio engineering experiments on measuring the parameters of the Earth’s gravity field using signals from low-orbit spacecraft and global navigation satellite systems. The authors experimentally validated a method for measuring gravitational acceleration using signals from a low-orbit satellite, as well as a method for measuring the current geoid height by means of an onboard bistatic radar system using signals from global navigation satellite systems, which had been previously proposed by the authors. The first experiment used the signal of a small low-orbit RS-44 (DOSAAF-85) spacecraft with a frequency of about 2.3 GHz, while the second experiment used primary measurement data from a bistatic radar system installed on board a foreign CYGNSS satellite. After the processing of measurement results obtained in the first experiment, the standard deviation of the measured gravitational acceleration of the low-orbit spacecraft from the model-derived values was found to amount to 6.3 mGal. It is currently impossible to measure gravitational acceleration by means of mechanical gravimeters on board the satellite due to weightlessness. In the second experiment, the measured and model-derived geoid heights differ by 13.3 cm, which meets the current requirements. In contrast to the conventional method of satellite radio altimetry, the method for measuring the current geoid height using an onboard bistatic radar system provides a means to obtain up to 60 reflected signals and measured heights simultaneously. The experimental results can be used to refine the Earth’s gravity field model in remote territories and water areas, including the Arctic region.