An optimization method for satellite double-difference observation structure under occlusion environment

Abstract

The invention discloses a method for optimizing a satellite double-difference observation structure in an occlusion environment. The method includes the steps of setting a satellite elevation mask angle according to the length of an initialization baseline; providing a reference satellite selection method based on the association factor array minimum condition number, sequentially calculating the conditional number of double-difference positioning resolving function method matrixes when satellites meeting the elevation mask angle condition serve as reference satellites, and then selecting the satellite with the minimum condition number as the reference satellite for double-difference positioning resolving; after a certain time interval, repeatedly selecting the satellite with the minimum condition number as the reference satellite; if the elevation angle of the selected reference satellite can not meet the satellite elevation mask angle condition in a time interval, repeatedly selecting the satellite with the minimum condition number as the reference satellite. The method can effectively improve a carrier double-difference observation structure in the occlusion environment, and reliability and stability of positioning resolving are improved.

Description

technical field [0001] The invention relates to the field of global navigation satellite system (GNSS) satellite positioning, in particular to a method for optimizing the global navigation satellite system (GNSS) satellite carrier double-difference observation structure in an occlusion environment. Background technique [0002] GNSS positioning has the characteristics of fast positioning speed, all-weather, automation, no need for line-of-sight between measuring stations, three-dimensional coordinates of points can be measured at the same time, and high accuracy. It has been widely used in many fields such as surveying and mapping, land, and transportation. However, in occluded environments such as densely built areas, satellite signals are easily blocked, reflected, and diffracted, and it is impossible to ensure a sufficient number of visible satellites or good satellite signal quality, so that an accurate positioning solution cannot be obtained. With the development and ap...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention provides an optimization method for the satellite double-difference observation structure in an occlusion environment, aiming at the situation that the GNSS carrier double-difference positioning solution is easily affected by the distribution of visible satellites in an occlusion environment, through Optimize the relative geometric distribution of the reference star and the non-reference star in the occlusion environment, improve the observation structure of the positioning solution after the double-difference ambiguity is fixed, and fundamentally reduce the ill-posedness of the cofactor matrix, thereby improving the reliability of the carrier double-difference solution and stability

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