Error estimation technique for GNSS-RO derived bending angle profile based on geometric optics

摘要

The present invention converts the signal characteristic change in the time-frequency domain into the impact rate-refraction angle domain in order to more reliably calculate the error information for the refraction angle profile calculated from the low-altitude GNSS-RO data, and calculates error information based on this. The present invention relates to a technique for calculating GNSS-RO refraction angle errors using geometric optics. In the present invention, in order to convert the GNSS-RO carrier phase data from the time-frequency domain to the impulse rate-refractive angle domain, the Doppler frequencies are calculated by dividing the frequency into a carrier profile calculated using the MSIS model and dividing by data section. Calculating the impact factor and the refraction angle by selecting the Doppler having the maximum spectral value through transformation is a technical point of the GNSS-RO refraction angle error calculation method using geometric optics.