Ras ionospheric anomaly monitoring method and system based on space-ground coordination

Abstract

The present invention provides an air-to-ground cooperative RAS ionosphere anomaly monitoring method and a system. The method comprises the steps of respectively monitoring each ground monitoring station according to telegraph texts transmitted from a plurality of visible satellites, removing non-available satellites according to the delay error among the first ionospheres of the visible satellites, monitoring first available satellites in the on-board manner on the condition that the number of the first available satellites at the ground monitoring station meet the requirement, conducting the dual-smoothing ionosphere gradient monitoring algorithm on the first available satellites on the condition that the positioning error of the first available satellite is monitored to meet the requirement in the on-board manner so as to obtain a pseudo range alignment error corresponding to the first available satellites, and estimating the RAS level of protection on the condition that the pseudo range alignment error also meets a threshold condition. In this way, the ionosphere anomalies of the RAS can be known. According to the technical scheme of the invention, the accuracy and the precision of ionosphere anomaly monitoring results are improved.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an air-ground coordinated RAS ionospheric anomaly monitoring method and system. Background technique [0002] The ionosphere is an ionized region of the earth's atmosphere, which is the upper atmosphere ionized by the excitation of solar high-energy radiation and cosmic rays. There are quite a lot of free electrons and ions in the ionosphere, which can change the propagation speed of radio waves, making Radio waves are refracted, reflected and scattered, resulting in rotation of the polarization plane and absorption to varying degrees. If the ionosphere is abnormal, it will change the propagation speed of radio waves and even cause wireless interruption, which will affect the integrity performance of the satellite navigation augmentation system. Therefore, monitoring whether anomalies occur in the ionosphere is an important prerequisite for calculating the integrity...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a RAS ionospheric anomaly monitoring method and system coordinated by air and ground to solve the problems of low accuracy and low practicability of existing ionospheric detection

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