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The Nanyue (NY) science satellite was launched on July 27, 2022, it is an integrated satellite carrying the global navigation satellite system reflectometry (GNSS-R) payload to detect marine, land, and other environmental resources. NY science satellite can receive the direct signal of BD-2 B1 and GPS L1, and obtain the configuration parameters of the direct signal through down-conversion, capture, and tracking processing; after receiving the reflected signals of BD-2 B1 and GPS L1, the two-dimensional mapping of power spectrum delay Doppler graph is obtained by down-conversion. The orbit of the satellite is 500 km solar synchronous orbit, a total of 5 orbits a day, 15 min per orbit, and the satellite mirror reflection point can cover the global scope. The NY science satellite can generate a non-uniform delay-Doppler map of 150 delays × 15 Doppler frequencies, where the high energy value portion captures more information near the specular reflection point (SP). This paper introduces the GNSS-R part of the NY science satellite, including instruments, specular reflection point distribution, and DDM. In addition, a preliminary study of soil moisture and sea surface wind speed inversion was conducted using data from September 2022 to February 2023. The results show that the root mean square error (RMSE) of soil moisture inversion in this paper is 0.0894 \(c{m}^{3}/c{m}^{3}\) compared with the true value of Soil Moisture Active and Passive (SMAP). Compared with the true wind speed represented by the wind speed reanalysis data set provided by the European Centre for Medium-range Weather Forecasts (ECMWF), the RMSE for sea surface wind speed inversion is less than 2.50 m/s. It meets the accuracy requirement of the NY science satellite measurement mission.

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NY GNSS Reflection Measurements: Task Review and Preliminary Results

  • 会议论文

  • 发表日期：

    2026年

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  • Yun Zhang,
  • Weiliang Liu,
  • Jing Wang,
  • Jun Hang,
  • Na Ta,
  • Xi Cai,
  • Xingyu Zhao,
  • Liyun Shi,
  • Yanling Han,
  • Zhonghua Hong

摘要

The Nanyue (NY) science satellite was launched on July 27, 2022, it is an integrated satellite carrying the global navigation satellite system reflectometry (GNSS-R) payload to detect marine, land, and other environmental resources. NY science satellite can receive the direct signal of BD-2 B1 and GPS L1, and obtain the configuration parameters of the direct signal through down-conversion, capture, and tracking processing; after receiving the reflected signals of BD-2 B1 and GPS L1, the two-dimensional mapping of power spectrum delay Doppler graph is obtained by down-conversion. The orbit of the satellite is 500 km solar synchronous orbit, a total of 5 orbits a day, 15 min per orbit, and the satellite mirror reflection point can cover the global scope. The NY science satellite can generate a non-uniform delay-Doppler map of 150 delays × 15 Doppler frequencies, where the high energy value portion captures more information near the specular reflection point (SP). This paper introduces the GNSS-R part of the NY science satellite, including instruments, specular reflection point distribution, and DDM. In addition, a preliminary study of soil moisture and sea surface wind speed inversion was conducted using data from September 2022 to February 2023. The results show that the root mean square error (RMSE) of soil moisture inversion in this paper is 0.0894 \(c{m}^{3}/c{m}^{3}\) compared with the true value of Soil Moisture Active and Passive (SMAP). Compared with the true wind speed represented by the wind speed reanalysis data set provided by the European Centre for Medium-range Weather Forecasts (ECMWF), the RMSE for sea surface wind speed inversion is less than 2.50 m/s. It meets the accuracy requirement of the NY science satellite measurement mission.