GNSS Receiver Pseudo-Range Differential Error Correction
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Solution Overview
Problem
Conventional GNSS receivers face challenges in accurately determining position due to multipath errors, which are environment-dependent and not corrected by separate reference stations, and require additional channels for differential operations.
Innovation Solution
A GNSS receiver that selects between normal and augmented modes to calculate pseudo-ranges, using differential operations between pseudo-ranges from normal and augmented channels to correct errors, eliminating the need for separate reference stations and reducing multipath errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional GNSS receivers use separate reference stations for error correction, then position accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the error correction function from the external reference station infrastructure and implements it within the receiver itself through the augmented channel. The receiver independently calculates differential pseudo-ranges using signals from the same satellites, eliminating the need for separate reference stations while maintaining position accuracy.
Solution Approach 2:
The receiver performs self-correction by using its own received satellite signals to calculate both normal and augmented pseudo-ranges. The system serves its own error correction needs by processing signals from visible satellites through dual channels, making the receiver self-sufficient without external reference infrastructure.
2Measurement precision
If additional channels are added for differential operations, then position accuracy is improved, but device complexity increases
Solution Approach 1:
The augmented channel performs multiple functions: it receives satellite signals, calculates augmented pseudo-ranges, and generates correction values for the normal channel. This multi-functional design allows error correction without requiring completely separate additional hardware channels, reducing overall system complexity.
Solution Approach 2:
The patent merges the error correction functionality into the existing signal processing chain by using the augmented channel to process signals from the same satellites received by the normal channel. The differential operation combines results from both channels to produce corrected positions, integrating correction functions rather than adding separate systems.
3Measurement precision
If multipath errors are corrected using separate reference stations, then position accuracy is improved, but loss of time occurs due to additional processing
Solution Approach 1:
The receiver performs preliminary error correction by calculating differential pseudo-ranges using the augmented channel before final position determination. The correction values are computed in advance from the same satellite signals, reducing the need for additional processing time during the main position calculation routine.
Data Source
AI summary
Methods and apparatus are provided for calculating a pseudo-range and position in a global navigation satellite system receiver. A first pseudo-range of a satellite is calculated for position determination of the global navigation satellite system receiver. A second pseudo-range of the satellite is calculated for position correction of the global navigation satellite system receiver. A differential operation is performed using the first pseudo-range and the second pseudo-range to eliminate an error. A more precise pseudo-range of the satellite is calculated using the differential pseudo-range.