Navigation augmentation system based on LEO small satellite

Abstract

The present invention discloses a navigation augmentation system based on a LEO small satellite. The system comprises at least four ground stations, a LEO small satellite module, an GNSS module and a user terminal. The LEO small satellite module is arranged at the exoatmosphere and is configured to receive navigation signals including atmosphere errors sent by the ground stations over the ground and receive navigation signals without atmosphere errors of the GNSS module in the sky, the differences of the navigation signals of two are compared to obtain the atmosphere delay difference correction near the current position of the LEO small satellite module and broadcast the signals to the ground, and a user terminal receives the atmosphere delay difference correction of the LEO small satellite module so as to effectively improve the navigation location precision. The navigation augmentation system based on the LEO small satellite can improve the receiving speed and the integrity of the navigation information through the user terminal so as to solve the problems that the ground stations of a ground-based augmentation system are easy to be shielded by buildings and disturbed by multiple paths and relieve the satellite-based augmentation service scope limitation.

Description

technical field [0001] The invention relates to a navigation enhancement system, in particular to a navigation enhancement system based on a small satellite in LEO orbit. Background technique [0002] At present, foreign satellite navigation augmentation systems are mainly divided into two categories: ground-based augmentation system (GBAS) and satellite-based augmentation system (SBAS). [0003] The ground-based augmentation system (GBAS) can achieve the purpose of improving the accuracy of satellite navigation by providing differential correction signals, and has been vigorously developed at home and abroad. The main disadvantage of the ground-based augmentation system is that the service range is limited, it is easily blocked by buildings, multi-path interference, etc., and the system integrity is limited. [0004] The satellite-based augmentation system (SBAS) monitors the navigation satellites by a large number of widely distributed differential stations with known pos...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a navigation augmentation system based on small satellites in LEO orbit, which can improve the speed at which user terminals receive navigation information and the integrity of navigation information, and solve the problem that the ground station encountered by the ground-based augmentation system is vulnerable. Building occlusion, multi-path interference and other issues, lifting the limitation of satellite-based enhanced service range

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