Ionospheric Delay Error Estimation via Spatial Dispersion
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Solution Overview
Problem
Current methods for determining the precision of signal propagation delay between a satellite and a ground station or satellite terminal are not precise enough, particularly due to ionospheric interference, which affects the accuracy of satellite-based positioning systems.
Innovation Solution
A method that determines the error in signal crossing time through the ionosphere by calculating spatial dispersion and combining it with variance from the TRIN model, using multiple cutting points and angles to maximize service availability and integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional interpolation procedures are used to determine propagation delay, then the calculation is simple, but the measurement precision of positioning is insufficient
Solution Approach 1:
The error determination is segmented into distinct components: spatial dispersion calculation, angle calculation, and variance combination. Each component is calculated separately using specific formulas, allowing for systematic improvement of positioning precision without overwhelming complexity
Solution Approach 2:
The patent replaces traditional mechanical interpolation methods with a mathematical model that substitutes physical measurement complexity with computational error calculation. The error is determined through formula-based calculation rather than complex physical measurement systems
2Measurement precision
If more cutting points and spatial dispersion calculations are used, then the error estimation precision is improved, but the calculation complexity increases
Solution Approach 1:
The patent performs preliminary calculations of spatial dispersion and angle values before final error determination. These pre-calculated values are stored and reused in the error estimation formula, reducing redundant computations and optimizing calculation time while maintaining precision
Solution Approach 2:
The patent transforms the error estimation problem by changing parameters from direct propagation delay measurement to spatial dispersion and angle-based calculations. This parameter transformation enables more precise error estimation through mathematical relationships rather than direct measurement
Data Source
AI summary
A method for determining an error in the estimation of time taken to cross the ionosphere by a signal along a vertical sight axis associated with a receiver, the vertical sight axis cutting the ionosphere at a point of interest, the vertical sight axis being an axis passing through the receiver and a satellite of interest, comprises: determining at least two points of cutting of the ionosphere by two sight axes between a satellite and at least two ground stations; determining at least one angle formed by segments going from the point of interest to two of the cutting points; and determining the spatial dispersion of the cutting points with respect to the point of interest on the basis of the angle, by finding the difference with a predetermined angle and taking the average of the difference or differences.