A Tri-frequency Cycle Slip Detection and Repair Method Based on Optimal Fixed Probability

Abstract

The invention provides a three-frequency cycle slip detection and restoration method based on optimal fixed probability, the maximum fixed probability is treated as a target, preferably, three sets oflinear combinations are optimized, and the probability of three-frequency cycle slip detection and restoration is improved. In the existing method, three conditions of long-wave length, low combinednoise and low ionized layer delay are considered respectively, and due to the fact that the three conditions cannot be met at the same time, the existing method is mainly of optimizing a plurality ofsets of linear combinations for cycle slip detection and restoration in a qualitive way, and the cycle slip fixed probability is not high. According to the method in the invention, the three constraints do not need to be considered independently, the three constraints are converted into fixed probabilities, the maximum fixed probability is treated as the target, and linear combination optimizationis carried out, so that the three-frequency cycle slip detection and restoration probability is the maximum, and great significance is brought to fully exerting the three-frequency observation data advantage and finally improving the positioning precision.

Description

technical field [0001] The invention relates to the field of high-precision data processing of a satellite navigation system, in particular to a three-frequency cycle slip detection and repair method. Background technique [0002] The noise of carrier phase observation is two orders of magnitude smaller than that of pseudorange observation, and it has a wide range of applications in the field of high-precision data processing of satellite navigation systems. In the actual environment, due to factors such as signal occlusion and interference, the carrier phase observation value will jump throughout the entire cycle, and this phenomenon is generally called cycle slip. The occurrence of cycle slips breaks the continuity of carrier phase, and cycle slip detection and repair must be performed before carrier phase observations are applied to high-precision data processing. At present, satellite navigation systems represented by Beidou and GPS can broadcast three-frequency navigat...

AI Technical Summary

Problems solved by technology

When the traditional method selects three sets of linear combinations, it generally chooses long wavelength, low combined noise, and low ionospheric delay as the goals, but the above three conditions cannot be satisfied at the same time, so the traditional method can only give a few sets of relatively good ones. Combination, the advantages brought by the three-frequency observation data have not been fully utilized

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