Beidou navigation satellite system carrier phase cycle slip detection and repairing method

Abstract

The present invention discloses a Beidou navigation satellite system carrier phase cycle slip detection and repairing method. The method comprises the steps of: employing a Beidou carrier phase observation amount and a pseudorange observation amount to construct cycle slip signals; employing an improved inherent time scale decomposition method, namely, an improved ITD method, to perform decomposition of the cycle slip signals to obtain a plurality of mutually separated inherent rotation component signals, namely PR components; screening out the PR components including the cycle slip; performing Hilbert spectral analysis for the PR components including the cycle slip to detect the epoch when the cycle slip occurs; and performing repairing of the PR component signals including the cycle sliptaken as training samples, employing the particle swarm optimization algorithm to perform parameter optimization of a least square support vector machine, namely an LS-SVM, employing the optimized LS-SVM to perform regression prediction, and calculating the difference of an actually measured value and a prediction value to determine the size of the cycle slip and repair the cycle slip. The methodcan effectively detect and repair the mini cycle slip appearing about one week in the Beidou single-frequency observation data.

Description

technical field [0001] The invention relates to a method for detecting and repairing a carrier phase cycle slip of a Beidou satellite navigation system, and belongs to the technical field of Beidou positioning accuracy control. Background technique [0002] A cycle slip in the carrier phase observation value of the Beidou satellite navigation system can cause decimeter-level deviations in the positioning results. Therefore, the detection and repair of cycle slips is very important in the high-quality positioning of the global satellite navigation system. Since the Beidou single-frequency observation data cannot form the MW combination and the ionospheric residual combination with high cycle slip detection accuracy, its tiny cycle slips are difficult to detect and repair. Slip has become a research hotspot in the field of cycle slip detection and repair. Many scholars regard the cycle slip signal as a singular value in the signal, and use the EMD method to detect and repair ...

AI Technical Summary

Problems solved by technology

Many scholars regard the cycle slip signal as a singular value in the signal, and use the EMD method to detect and repair single-frequency cycle slips, but the EMD method has problems such as over-envelope, under-envelope, modal aliasing, and endpoint effects, which will affect Cycle Slip Detection Accuracy

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