Analysis of Stochastic Model in GEO/IGSO/MEO based on Triple-Frequency Observations

摘要

Focusing on the complex constellation of the BeiDou satellite navigation positioning system in China, this article analyzes the relationship between zero baseline and ultrashort baseline according to the residual value of carrier observation, signal to noise ratios, and elevation angles of different constellation satellites. A stochastic model based on the distance between the satellite and Earth, signal-to-noise ratio and elevation angle was proposed, which applied to the baseline solution of the Beidou triple-frequency single epoch. Analysis of measured data shows that compared with the traditional sinusoidal trigonometric function model, although the proposed model has no obvious effect on improving the positioning accuracy, the success rate of the ambiguity resolution of 4.2m, 4.17km and 8.84km are effectively improved by 0.1%, 4.7% and 1.1%, which enhanced the stability of calculation results.