Fourier Analysis of GNSS-LEO Radio Occultation Signals, Resolution and Limitations
This paper investigates the limitations imposed by the receiver on the accuracy of the Fourier techniques related to radio occultations in the Earth atmosphere. These limitations are related to sampling frequency and signal-to-noise ratio, as well as diffraction. The impact of each of these limiting factors are discussed and analysed in terms of measurement accuracy and resolution. A main result is that higher order phase variations in the received signal must be taken into account in order to determine the sampling rate.
KeywordsGeometrical Optic Diffraction Limit Radio Occultation Persistence Time Refractive Index Gradient
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