A kind of anti-multipath GNSS fast satellite selection method and device

Abstract

The invention provides an anti-multipath GNSS rapid satellite method and apparatus. By analyzing the received navigation text information, the unhealthy satellite, the satellite with an elevation angle less than the threshold value, and the satellite being seriously subjected to multipath influence can be successively eliminated from the captured satellites; and then satellites can be selected from the screened satellites according to the azimuth, the elevation angle and the signal quality of the satellites. The method takes into account the influence of user ranging error and satellite geometric distribution, and eliminates the satellite being seriously subjected to multipath influence while considering the satellite geometric distribution, so that the accurate final positioning resolution can be guaranteed; and moreover, the method doesn't need to calculate the GDOP, so that the problem that a conventional satellite selection method is large in computational complexity can be effectively solved and the requirement of real-time positioning of a receiver can be met.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a multipath-resistant GNSS fast satellite selection method and device. Background technique [0002] Global Navigation Satellite System (GNSS) is a satellite-based radio navigation system based on artificial earth satellites, which provides all-weather, high-precision position, speed and time information for various military and civilian equipment in land, sea, air and space around the world. The GNSS systems currently in operation mainly include the Global Positioning System of the United States, the GLONASS Positioning System of Russia, the Galileo Positioning System of Europe and the Beidou Positioning System of China. A GNSS receiver that simultaneously receives the satellite signals of the above multiple systems is called a multi-constellation GNSS receiver, which can use more satellite signals to improve positioning accuracy and reliability. [0003] Among the...

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Problems solved by technology

[0004] However, with more and more satellites in orbit deployed by the Beidou and Galileo systems, the number of visible stars that can be received by multi-constellation satellite navigation receivers has increased significantly. It cannot meet the requirements of real-time positioning; in addition, the above-mentioned satellite selection algorithm is based on the principle of minimum GDOP, and only focuses on the minimization of the geometric distribution of satellites. If satellites with serious multipath effects are selected into it, the user ranging error will be seriously deteriorated, and eventually The positioning accuracy of the receiver may not be optimal

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