Method and system for fixing integer ambiguity

Abstract

The invention relates to a method and a system for fixing integer ambiguity. The method comprises the steps of: S1, obtaining a measurement value of satellite and correcting constant term of the double-difference carrier phase observation equation of the satellite according to the measurement value of the satellite; S2, obtaining a wide-lane double-difference observation equation based on the corrected constant term; S3, solving the coefficient matrix of unknown parameters in the wide-lane double-difference observation equation using a weighted least squares algorithm and solving the variance-covariance matrix and the ambiguity floating point solution of output parameters of the wide-lane double-difference observation equation; S4, performing full rank decomposition on the variance-covariance matrix Qw to obtain a B matrix; and S5, performing ambiguity fixing on the ambiguity floating point solution by replacing the variance-covariance matrix with the B matrix to obtain an ambiguity fixing solution. According to the integer ambiguity fixing method, the precision of the ambiguity can be improved and the search range of the integer ambiguity can be narrowed.

Description

technical field [0001] The invention relates to the field of global navigation and positioning, in particular to a method and system for fixing the ambiguity of the whole circumference. Background technique [0002] In GPS precise positioning, the LAMBDA algorithm based on descending correlation ambiguity transformation is a well-recognized search method of ambiguity decomposition with better performance among these methods. However, the existing search methods based on the LAMBDA algorithm have certain defects. [0003] For example, Chinese patent CN201710818513 discloses a "fast fixation method between network RTK reference stations". The ambiguity floating-point solution constructs a virtual indirect adjustment observation model and constraints. Then use the LAMBDA algorithm to solve the ambiguity. Although this reduces the search range of the ambiguity floating-point solution, it increases the difficulty and depth of calculation, which will increase the difficulty of ...

AI Technical Summary

Problems solved by technology

Although it can effectively suppress the misjudgment and missed judgment of the ambiguity and reduce the search time, the setting of the Ratio value will fluctuate greatly. Every time the calculation is performed, the value of the ambiguity of the whole week may deviate, resulting in positioning The result deviates

[0005] To sum up, the existing search method based on the LAMBDA algorithm has the defects of great difficulty, inaccurate results and low efficiency when solving the ambiguity.

Images