SBAS Quantization Error Bounding at User Equipment
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Solution Overview
Problem
Existing Satellite Based Augmentation Systems (SBAS) require a user grid to approximate quantization errors, leading to increased computational time and potential overestimation of quantization effects on individual users.
Innovation Solution
A method and system that allow users to calculate quantization errors at the user equipment level by determining the line-of-sight vector and degradation term, eliminating the need for a system-side user grid and reducing computational time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system calculates quantization errors using a user grid approach, then the approximation level of quantization effect is improved, but the computational time increases
Solution Approach 1:
Instead of the system calculating quantization effects for multiple user positions (system-side approach), the patent inverts the approach by enabling user equipment to calculate its own quantization effects using its specific line-of-sight vector (user-side approach). This inversion eliminates the need for system-side user grid calculations while maintaining accuracy for each individual user.
Solution Approach 2:
The user equipment performs self-service by independently calculating its own quantization effects using its specific line-of-sight vector and the received covariance matrix. Each user equipment autonomously determines its position-dependent quantization error without requiring system-side computation or user grid approximation, thereby reducing system computational burden while maintaining individual accuracy.
2Measurement precision
If the system uses a user grid to approximate quantization effects, then the approximation accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the quantization effect calculation from the system-side processing and relocates it to the user equipment. By taking out the computational burden from the system, the patent eliminates the need for complex system-side user grid management while maintaining the ability to accurately compute position-dependent quantization effects at the user level.
Solution Approach 2:
The system inverts the conventional approach by moving from system-calculated approximations to user-calculated exact values. Each user equipment uses its own line-of-sight vector to compute its specific quantization effect, eliminating the need for system-side user grid infrastructure and reducing overall system complexity.
3Reliability
If the system broadcasts inflated covariance matrices, then the quantization effect is covered for all users, but the protection level calculation becomes less accurate for individual users
Solution Approach 1:
Instead of broadcasting a single inflated covariance matrix that applies uniformly to all users (global approach), the patent enables each user equipment to calculate its own position-specific quantization effects using its unique line-of-sight vector. This local quality approach allows each user to receive accurate, individualized protection level calculations that account for their specific geometric relationship with the satellite, while the system only needs to broadcast the base covariance matrix without inflation.
Data Source
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AI summary
A method (100) for accounting for quantization errors in a Satellite Based Augmentation System, SBAS, wherein the method (100) comprises: transmitting (S110), by an SBAS, integrity parameters of a satellite; receiving (S120), by a user equipment, the integrity parameters of the satellite; calculating (S130), by the user equipment, the degradation term of the quantization of the transmission; and calculating (S160), by the user equipment, a value characterizing the residual range error associated with the orbit corrections and clock corrections belonging to the satellite.