Ionospheric Delay Compensation Using Altitude-Based Scale Factor
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Solution Overview
Problem
Current satellite navigation systems face challenges in accurately compensating for ionospheric delays when a receiver is within the ionosphere, as existing models are designed for receivers below the ionosphere and do not account for the receiver's altitude effectively.
Innovation Solution
A method that calculates an initial ionospheric delay using Klobuchar's model and applies a scale factor based on the receiver's altitude to account for the reduced ionospheric delay when the receiver is within the ionosphere, utilizing the International Reference Ionosphere database for precise calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Klobuchar's model is used to calculate ionospheric delay, then the delay can be estimated for receivers below the ionosphere, but the model cannot accurately compensate for ionospheric delay when the receiver is within the ionosphere
Solution Approach 1:
The patent introduces a scale factor that varies based on the receiver's altitude within the ionosphere. This scale factor is applied to the ionospheric delay calculated by Klobuchar's model to adjust the compensation accuracy for different receiver locations. The scale factor is determined by the ratio of the ionospheric delay at the receiver's altitude to the ionospheric delay at a reference altitude, enabling localized adjustment of the delay compensation based on the receiver's specific position within the ionosphere.
2Ease of operation
If existing ionospheric delay models are used, then calculations can be performed for ground-based receivers, but the models do not account for the receiver's altitude when the receiver is within the ionosphere
Solution Approach 1:
The patent modifies the existing Klobuchar's model by introducing an additional parameter - the scale factor based on receiver altitude. This parameter change allows the model to adapt to receivers within the ionosphere without fundamentally changing the underlying calculation methodology. The scale factor is calculated using the receiver's altitude and the ionospheric delay characteristics, enabling the model to maintain its computational simplicity while improving accuracy for elevated receivers.
Data Source
AI summary
In one embodiment, a method for ionospheric delay compensation is provided. The method includes determining an ionospheric delay based on a signal having propagated from the navigation satellite to a location below the ionosphere. A scale factor can be applied to the ionospheric delay, wherein the scale factor corresponds to a ratio of an ionospheric delay in the vertical direction based on an altitude of the satellite navigation system receiver. Compensation can be applied based on the ionospheric delay.