GNSS satellite clock error real-time estimation quality control method

Abstract

The invention provides a GNSS satellite clock error real-time estimation quality control method aimed at characteristics that real-time clock error estimation has high requirement on observation data quality and cannot perform post residual error edition. The method comprises two aspects: first step, before parameter estimation, preprocessing original observation data, including gross error rejecting and cycle slip detection; second step, after update of filter observation, based on a posttest observed value residual error, analyzing and processing a gross error and cycle slip which are not detected in a previous step, specifically including steps of establishing a square root information filtering algorithm model, processing noise; smoothing square root information; and based on square root information filtering, performing real-time quality control. The method can realize preprocessing of real-time clock error data and efficient quality control, and can efficiently find out problematic observed quantity, prevents filter divergence, so as to realize real-time clock error stable estimation and satisfy real-time high-precision positioning requirement.

Description

technical field [0001] The invention relates to the technical field of quality control, in particular to a quality control method for real-time estimation of GNSS satellite clock error. Background technique [0002] High-quality observation data is one of the prerequisites for realizing high-precision clock error determination. Although the quality of GNSS (Global Navigation Satellite System, global satellite navigation system) observation has been greatly improved, in actual observation, due to the instability of the receiver, the influence of multipath effects, and ionospheric scintillation, etc., satellite signals often fail. Data quality problems such as locks or abnormal observations, if these problems are not properly resolved, will directly affect the accuracy of GNSS real-time clock difference estimation, and even cause filter divergence. [0003] In the process of GNSS real-time clock difference data processing, the validity of the mathematical model determines the...

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a quality control method for real-time estimation of GNSS satellite clock error, which solves the technical problems that real-time clock error estimation requires high quality of observation data and cannot be edited after the event

Images