Medium-long baseline single-epoch ambiguity resolution method, system and device and storage medium

Abstract

The invention discloses a medium-long baseline single-epoch ambiguity resolution method, system and device and a storage medium and belongs to the technical field of global navigational satellite positioning. The method comprises the steps that a single-epoch double-difference wide-lane combined observation equation is established according to observation data of global navigational satellites; coordinate correction parameters are constrained through a regularization method, the morbidity of matrixes is improved; by combining with a lambda algorithm, single-epoch wide-lane ambiguity fixation is achieved; a double-difference ionized-layer-free combined observation equation is represented by using wide-lane ambiguity and original carrier ambiguity and is substituted based on fixed wide-laneambiguity; original carrier ambiguity fixation is achieved by using the lambda algorithm. According to the technical scheme of the embodiment, only carrier observation values are adopted, the characteristic is avoided that the precision of pseudo-range observation values is poorer, and meanwhile the rank defect problem of a normal equation in single-epoch ambiguity resolution is solved by adoptingthe regularization method. In addition, by combining with ionized-layer-free combination, the influence of ionization layer errors is better eliminated, and the success rate of ambiguity fixation isimproved.

Description

technical field [0001] The invention belongs to the technical field of global navigation satellite positioning, and specifically relates to a method, system, device and storage medium for solving the ambiguity of a single epoch in a medium-long baseline. Background technique [0002] The single-epoch baseline solution can make the global positioning system play a greater role, and has been widely used in navigation and positioning, deformation monitoring and other fields. [0003] The key problem of high-precision single-epoch baseline solution is the whole cycle ambiguity solution. For medium and long baselines, a typical method is multi-frequency step-by-step ambiguity solution. The global satellite navigation system provides three or more frequency measurement values, and the frequency combination of these measurement values ​​can form some linear combinations with better performance, which is helpful for the correct resolution of ambiguity. The basic idea of ​​multi-fre...

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Problems solved by technology

However, under medium and long baselines, the wide-lane measurement values ​​are greatly affected by ionospheric errors and noise, resulting in a low success rate of ambiguity resolution. In addition, the combination method of pseudorange and carrier phase can solve the problem of rank deficiency of normal equations. The difference between the accuracy of distance observations and carrier phase observations is large, which reduces the accuracy of baseline calculation to a certain extent. Although constraints such as baseline length can reduce the ill-conditioned nature of the normal equation, it is less dependent on prior information. powerful

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