GNSS ambiguity fixing method and storage medium

The invention discloses a GNSS ambiguity fixing method and a storage medium in the field of satellite navigation, and the method comprises the steps: obtaining a carrier phase observation value data set and a pseudo-range observation value data set of a GNSS, and constructing a positioning data set; filtering the positioning data set to obtain an advanced precision positioning data set; re-positioning by using the high-level precision positioning data set; obtaining an output integer ambiguity floating point value and precision through a positioning result; fixing the floating point value and the precision of the integer ambiguity through an LAMBDA method; when the fixation is successful, outputting a fixed solution; otherwise, performing optimal integer equivalent estimation on the integer ambiguity floating point value and precision to obtain an integer ambiguity alternative group set; performing screening and segmented estimation on the integer ambiguity alternative group to complete integer ambiguity fixa