Abstract:Based on the GPS radio occultation observations on the FY-3E satellite, we verify the single-frequency radio occultation processing algorithm and analyze its accuracy. Firstly, we calculate the ionospheric relative TEC (relTEC) by the carrier phase observation of L1 frequency point and pseudo-range observation C1. Then we reconstruct the carrier phase observation L*2 of the second frequency point, and invert the atmospheric refractive index products. Finally, we verify and analyze the accuracy of single-frequency relTEC, reconstructed L*2 excess phase and refractive index products. The results show that: 1) The correlation coefficients between the relTEC and L*2 excess phases obtained by the single-frequency calculation and the dual-frequency results are greater than 0.95. 2) The relative average deviation of L*2 excess phase Doppler is less than 0.2%, and the relative standard deviation is less than 0.4%. 3) Compared with the ERA5 data, the bias and RMS of the single/dual frequency refractive index inversion are in good agreement. The refractive index accuracy of single-frequency inversion with a geopotential height of over 25 km is slightly reduced compared to that of dual-frequency inversion.
TIAN Haoran,MENG Xiangguang,DU Qifei et al. Verification and Accuracy Analysis of Single-Frequency Processing Based on GPS Radio Occultation[J]. jgg, 2023, 43(7): 750-754.