Method for evaluating ionospheric differential corrections of satellite navigation signals
A technology of satellite navigation signals and differential correction numbers, applied in the field of satellite navigation signals, can solve the problems of not fully utilizing the ionospheric delay time-domain slowly changing characteristics, the influence and constraints of calculation accuracy, etc.
Inactive Publication Date: 2012-01-18
BEIHANG UNIV
View PDF0 Cites 18 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, these methods rely more on the empirical model of the ionosphere, so their calculation accuracy is inevitably affected and restricted by the accuracy of this type of model itself. At the same time, these methods do not make full use of the time-domain slow-changing characteristics of the ionospheric delay.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0064] The present invention relates to a satellite navigation signal ionospheric differential correction estimation method, in particular to a satellite navigation signal ionospheric differential correction estimation method based on weighted Kalman filtering, see figure 1 As shown, the steps are as follows:
[0065] Step 1. According to the continuous tracking observation of the satellite by the ground reference station, the position of the ionospheric penetration point formed thereby is calculated, and the vertical delay of the ionosphere at each penetration point is extracted from the observations, and then these penetration points are used to The ionospheric vertical delay on the penetration point is used as an observation to construct a filtering model, which is the basis for the filter to be estimated, and the filtering model includes a state model and a measurement model. The state model is constructed through the slow-varying characteristics of the ionospheric delay, ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a method for evaluating ionospheric differential corrections of satellite navigation signals. The method comprises the following steps of: 1, according to the continuous tracking observation of a ground reference station to a satellite, calculating positions of ionospheric breakthrough points formed based on the continuous tracking observation of the ground reference station to the satellite, extracting ionospheric vertical delay of each breakthrough point from observed quantity, and then, constructing a filtering model by taking the ionospheric vertical delay on the breakthrough points as the observation quantity, wherein the filtering model is a basis for a filter to perform evaluation and comprises a state model and a measuring model, the state model is structured based on slowly varying characteristics of ionospheric delay, and the measuring model is structured according to a dual-linear model; and 2, synchronously running all sub-filters to obtain an evaluation result of each sub-filter on the ionospheric differential corrections, and weighting respective evaluation results of the sub-filters according to different ionospheric observability factors of all the sub-filters so as to obtain the final evaluation on the ionospheric differential corrections.
Description
Technical field: [0001] The present invention provides a method for estimating ionospheric differential corrections for satellite navigation signals, in particular a method for estimating ionospheric differential corrections for satellite navigation signals based on weighted Kalman filtering, which relates to ionospheric delay correction technology for satellite navigation signals, specifically The invention relates to an ionospheric differential correction number estimation method based on weighted Kalman filtering and observability analysis, and belongs to the technical field of satellite navigation systems. Background technique: [0002] The ionosphere is the ionized atmospheric region between 50km and 1000km from the earth. When the satellite navigation signal passes through the ionosphere, the interaction between the signal and the ion causes a delay of the satellite navigation signal, and this delay further leads to an error in the pseudorange measurement. The time de...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 陶文辉洪晟高书亮李莹周正张栋
Owner BEIHANG UNIV