Beidou navigation constellation rapid satellite selection method

Abstract

The present invention discloses a Beidou navigation constellation rapid satellite selection method, belonging to the satellite navigation field. The method selects 6 satellites from a plurality of visible satellites of the Beidou navigation system for localization calculation, the space geometry distribution of Beidou navigation constellation is employed and the maximum volumetric method commonly used in the satellite selection field in the satellite navigation system is combined to perform satellite selection in a low elevation angle area, a middle elevation angle area and a high elevation angle so as to reduce the number of loops of satellite selection in a traditional satellite selection process, the discrete Hopfield neural network algorithm is employed to perform GDOP (Geometric Dilution of Precision) calculation formula optimization so as to avoid the matrix inversion operation in the traditional GDOP calculation, reduce the calculation amount of the GDOP solution and satisfy the user's requirements for accuracy, timeliness and robustness of the satellite navigation. The method considers the special cases such as space geometry geometric distribution and considers influence of various complex condition on a satellite selection result so as to successfully realize rapid satellite selection of the Beidou navigation constellation.

Description

technical field [0001] The invention relates to a method for selecting a Beidou navigation constellation, which belongs to the technical field of satellite navigation, and in particular to a method for quickly selecting stars of the Beidou navigation constellation. Background technique [0002] The global satellite navigation system has become a very important information infrastructure for the country. In some important areas, such as relying on foreign satellite navigation systems, once an emergency or a major conflict of interest occurs, the national defense, military, and social and economic security of the entire country will be threatened. The impact on the national interest will be disastrous. Therefore, the Beidou satellite navigation system came into being. Its birth has made our country no longer subject to foreign satellite systems on some special occasions. It is of great significance to our country both in military strategy and in daily life. [0003] The Beid...

AI Technical Summary

Problems solved by technology

However, the traditional GDOP calculation polynomial is used in Comparative Document 1, which involves matrix multiplication and matrix inversion operations of the observation matrix G, and the computational complexity is relatively large. The purpose of star selection is to reduce the computational complexity of the system, so It is particularly important to propose a fast star selection method suitable for the Beidou navigation constellation

[0009] Comparative document 2: Invention patent: Multi-mode GNSS satellite selection method based on GDOP and UERE, patent number: 201610350058.8, discloses a multi-mode GNSS satellite selection method based on GDOP and UERE, which combines GDOP and UERE to determine the satellite elevation angle The simplified calculation model calculates the user equivalent error UERE, and determines those satellite combinations through the positioning evaluation function and the ergodic cut-off altitude angle, and selects satellites in the low elevation angle area, the middle elevation angle area and the high elevation angle area, but the GDOP calculation adopted by this method The formula is still the traditional calculation method, that is, formula (1). When calculating the user equivalent error UERE, it still needs to use GDOP as the benchmark, so the calculation complexity of the comparison file 2 is relatively large

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