Beidou differential correction number estimation method and system under weak geometric observation condition

By introducing precise ephemeris data from BeiDou high-precision forecasts and Kalman filtering, the problem of insufficient satellite geometric observations in areas with tight monitoring station layouts was solved, achieving high-precision differential correction estimation and improving the accuracy and stability of differential integrity parameter estimation for the BeiDou system.

CN121784778APending Publication Date: 2026-04-03THE 20TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORP
View PDF 0 Cites -1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-24
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

In small, elongated areas, the monitoring stations are densely and unevenly distributed, resulting in weak satellite geometric observations. The singularity of the design matrix is ​​amplified during differential processing, and the error of the differential integrity parameter is large and unstable, making it difficult to meet the needs of practical applications.

Method used

By introducing the high-precision ephemeris of BeiDou high-precision forecast, and using the orbital error of the broadcast ephemeris as a priori constraint, the broadcast ephemeris error and clock error in the pseudorange residual are decoupled. Combined with Kalman filtering, high-precision estimation of satellite orbital difference/clock error differential correction is achieved.

Benefits of technology

It achieves high-precision estimation of BeiDou differential integrity parameters under weak geometric observation conditions. The algorithm is simple and effective, improving estimation accuracy and stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121784778A_ABST
    Figure CN121784778A_ABST
Patent Text Reader

Abstract

The invention discloses a Beidou differential correction estimation method and system under a weak geometric observation condition, and relates to a satellite navigation and wide area enhancement technology, and the method comprises the steps: obtaining a Beidou navigation satellite original double-frequency pseudo-range measurement value observed by a receiver at a current moment; calculating a measurement residual error based on the double-frequency ionosphere-free combined pseudo-range observation value; carrying out pseudo-range residual time synchronization by adopting a common-view satellite method, and removing a receiver clock error item; broadcast ephemeris prior orbit error calculation; estimating a satellite clock error correction based on the broadcast ephemeris prior orbit error; and according to the estimated satellite clock error correction number and the pseudo-range residual error after time synchronization, calculating the residual error of the pseudo-range residual error so as to obtain satellite orbit correction number estimation. According to the method, high-precision Beidou differential integrity parameter estimation under a small-area weak geometric observation condition is realized by introducing a Beidou high-precision forecast precision ephemeris, the algorithm is simple to realize, and the effect is remarkably improved.
Need to check novelty before this filing date? Find Prior Art