GNSS Ionospheric Delay Correction Using Delta-Epoch Carrier Phase
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Solution Overview
Problem
Existing GNSS positioning technologies face challenges in accurately correcting ionospheric delays, particularly when using single-band satellites, and require complex computations and external data, leading to higher costs and longer convergence times.
Innovation Solution
The method determines delta-ionosphere errors across consecutive epochs to calculate ionospheric delay corrections internally, using carrier phase measurements from single-band or multi-band satellites, eliminating the need for external data and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional GNSS positioning is used, then the system is simple to operate, but the positioning accuracy is only a few meters
Solution Approach 1:
The system performs self-correction by internally determining ionospheric delay corrections through accumulating delta-ionosphere errors from carrier phase measurements, eliminating the need for external correction data services and achieving sub-meter accuracy without additional complex external systems
Solution Approach 2:
The system pre-determines ionospheric delay corrections by continuously accumulating delta-ionosphere errors across consecutive epochs before final position calculation, allowing the corrections to be ready and applied efficiently during positioning operations
2Measurement precision
If external ionospheric correction data is used, then the ionospheric delay correction accuracy is improved, but the cost increases due to paid services
Solution Approach 1:
The system eliminates dependency on paid external correction services by autonomously determining ionospheric delay corrections through internal accumulation of delta-ionosphere errors derived from carrier phase measurements, achieving accurate corrections at no additional cost
3Measurement precision
If complex computation methods are used for ionospheric correction, then the correction accuracy is improved, but the convergence time increases
Solution Approach 1:
The system pre-computes ionospheric delay corrections by continuously accumulating delta-ionosphere errors across consecutive epochs before final position calculation, allowing the corrections to be ready and applied efficiently, thereby reducing convergence time while maintaining accuracy
Solution Approach 2:
The system divides the ionospheric correction process into discrete delta-ionosphere error calculations for each epoch, which are then accumulated to form the total correction, enabling efficient processing and faster convergence compared to monolithic computation methods
Data Source
AI summary
An example method for Global Navigation Satellite System (GNSS)-based positioning performed by a GNSS device, the method may include receiving, from at least one satellite, a plurality of signals across a series of consecutive epochs and determining delta-ionosphere errors for the series of consecutive epochs, wherein each delta-ionosphere error indicates a change in ionospheric delay in carrier phase measurements taken on at consecutive epochs. The method may also include determining an ionosphere delay correction based on accumulating the delta-ionosphere errors and obtaining a position of the GNSS device based on the determined ionosphere delay correction.