Electron density retrieval from occulting GNSS signals using a gradient-aided inversion technique

摘要: Abstract In the coming years, opportunities for remote sensing of electron density in Earth’s ionosphere will expand with advent Galileo, which become part global navigation satellite system (GNSS). Methods accurate retrieval from radio occultation data continue to improve. We describe a new method using total content measurements obtained low Earth orbit. This can be applied dual-frequency receivers tracking GPS or Galileo transmitters. simulation study demonstrates that significantly improves accuracy compared standard Abel inversion approach assumes spherically symmetric ionosphere. Our incorporates horizontal gradient information available maps Total Electron Content (TEC), are International GNSS Service (IGS) on routine basis. The combination ground and space allows us improve profiles near tangent point E F regions