Air-ground co-location and integrity monitoring method based on ldacs

Abstract

The present invention provides an air-ground collaborative positioning method based on LDACS. On the basis of LDACS, the method divides users into high-altitude users, high-altitude users and low-altitude users, and realizes air-ground collaboration through information interaction among users of these three levels. positioning; at the same time, this method introduces new failure modes and integrity hazards, therefore, the present invention also provides an integrity monitoring method based on the air-ground co-location method, including a fault detection algorithm and a solution method for protection levels; and proposes an integrity A method for evaluating the complexity of sex monitoring. The LDACS-based air-ground collaborative positioning method provided by the present invention well solves the problem of insufficient APNT services under poor terrain and terrain conditions, making the positioning results more accurate. At the same time, the integrity monitoring mechanism provided by the present invention describes The fault detection algorithm and protection level solution method suitable for APNT service and LDACS positioning algorithm make the solution of integrity monitoring threshold more convincing.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to an LDACS-based space-ground collaborative positioning and integrity monitoring method. Background technique [0002] Global Navigation Satellite System (GNSS) is an accurate provider of global positioning, navigation and timing (Position, Navigation and timing, PNT) information, with capable receivers and dense satellite constellations, GNSS users usually think The position and time information provided by its receivers is perfectly accurate, but for more sophisticated users the needs go beyond accuracy and extend to the integrity of the GNSS information. [0003] Integrity refers to the ability of the system to provide warnings to users in a timely manner when GNSS signals and the system are not available for navigation. The wide-area augmentation system calculates the differential correction number at the central station, and should also provide integrity informat...

AI Technical Summary

Problems solved by technology

[0005] At present, there are the following problems in the implementation and application of APNT services under different terrain and terrain conditions: First, for users in middle-altitude areas, due to terrain and urban characteristics, the distance measurement source may be partially blocked, although APNT services may still be implemented normally, However, its positioning and timing results are not very accurate, and there may be large errors; second, for users in low-altitude areas, the ranging source is more seriously blocked. Under this condition, the implementation of APNT services is more difficult, such as in canyons At airports, where GNSS services are unavailable, aircraft positioning can be a challenge

However, with the development of GNSS, the traditional RAIM algorithm is no longer suitable for multi-navigation systems, and its application scenarios are not limited to ocean routes

Images