GNSS Code Corrections for Carrier Phase Ambiguity Resolution
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Solution Overview
Problem
Global Navigation Satellite Systems (GNSS) face inaccuracies in positioning due to errors such as satellite orbit, clock errors, and atmospheric delays, which current augmentation systems only partially address, especially for carrier phase measurements, requiring subscription-based services for complete corrections.
Innovation Solution
A method and device that utilize code corrections from augmentation systems to correct both code pseudorange and carrier phase measurements, enabling a filter to produce a more accurate position and ambiguity estimate, switching to carrier phase dominance once stability is achieved, and handling code corrections as zeros if none are received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code corrections from augmentation systems are applied to both code pseudorange and carrier phase measurements, then positioning accuracy is improved, but device complexity increases due to additional correction processing requirements
Solution Approach 1:
The patent combines code corrections from augmentation systems with both code pseudorange and carrier phase measurements in a unified correction process. The code corrections are applied to eliminate ambiguities in carrier phase measurements while maintaining the accuracy benefits of both measurement types, achieving comprehensive positioning correction without requiring separate processing paths.
Solution Approach 2:
The patent introduces code corrections as an intermediary element that mediates between the code pseudorange and carrier phase measurements. These corrections act as a bridging component that resolves ambiguities in carrier phase data while leveraging the accuracy of code-based measurements, thereby improving overall positioning accuracy through a coordinated correction approach.
2Measurement precision
If carrier phase measurements are used for positioning, then measurement precision improves, but reliability decreases due to signal ambiguities and errors requiring subscription-based corrections
Solution Approach 1:
The patent implements a feedback mechanism where code corrections from augmentation systems are continuously applied to carrier phase measurements to resolve ambiguities. This feedback loop ensures that the carrier phase data is continuously refined and validated, maintaining both the high precision and reliability needed for accurate positioning without requiring subscription-based services.
Solution Approach 2:
The patent changes the parameter state of carrier phase measurements by applying code corrections that eliminate ambiguities. By transforming the ambiguous carrier phase data into corrected, unambiguous measurements, the system achieves both the precision of carrier phase and the reliability of code-based measurements, overcoming the trade-off between these two measurement types.
3Ease of manufacture
If publicly available augmentation systems provide free code corrections, then cost is reduced, but measurement precision deteriorates because only code corrections are provided without carrier phase corrections
Solution Approach 1:
The patent makes the correction system universal by demonstrating that code corrections from publicly available augmentation systems can be effectively applied to both code pseudorange and carrier phase measurements. This multi-functional approach allows the same free code corrections to improve both measurement types, achieving comprehensive positioning accuracy without requiring paid subscription services for carrier phase corrections.
Data Source
AI summary
A method and system for approximating a position using a Global Navigational Satellite System (GNSS) having a plurality of GNSS satellites and an augmentation system, the method including the steps of obtaining an initial code pseudorange measurement and an initial carrier phase measurement from a signal transmitted by a GNSS satellite in the GNSS system, receiving a code correction from the augmentation system, using the code correction to correct the initial code pseudorange measurement and the initial carrier phase measurement to mitigate for errors in the signal, to result in a corrected code pseudorange measurement and a corrected carrier phase measurement, and using a code dominated measurement in a filter which outputs apposition and ambiguity estimate.