Estudo da técnica de rádio ocultação para sensoriamento remoto da atmosfera terrestre

Abstract

The technique of radio occultation signals from the global navigation satellite system (GNSS) allows obtaining information about the state of the Earth’s atmosphere through the acquisition of satellite position data, phase and Doppler effect of the signal when transiting theEarth’s atmosphere. Later, vertical refractivity or refractive profiles and bending angle are obtained by processing this data. In a second processing level, temperature, pressure and water vapor profiles can be obtained. These profiles have the potential to improve the quality of short-term weather forecasts, being one of the most relevant satellite-based techniques to reduce the forecasting error of NWP systems. Moreover, the number of Low Earth Orbit satellites dedicated to radio occultation is growing, especially in the coming years with the resources of private initiative in the satellite weather sector. Therefore, the study of this technique becomes indispensable to efficiently take advantage of the quantity and quality of this data, as well as to measure its impact on Numerical Weather Predication systems and other applications. Thus the objective of this work is to study the technique of radio occultation of GNSS signals, for this purpose a bibliographical review of the main works in the area is made, and later the implementation of Abel’s transformation to obtain these profiles.