Pseudorange Correction for GPS Positioning Accuracy
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Solution Overview
Problem
Current GPS systems face inaccuracies due to multipath errors, time synchronization issues, and line of sight interference, making it challenging to determine precise positioning, especially in urban environments where pedestrians and cyclists experience significant errors.
Innovation Solution
An apparatus that receives non-GPS data from sensors like RFID tags and highly assisted driving sensors to determine its position accurately, and calculates pseudorange corrections based on measured satellite pseudoranges and actual positions, broadcasting these corrections to improve positioning accuracy for nearby devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS data is used for positioning, then positioning functionality is provided, but positioning accuracy deteriorates due to multipath errors, time synchronization issues, and line of sight interference
Solution Approach 1:
The patent introduces an intermediary system consisting of pseudorange correction servers and base stations that mediate between GPS satellites and mobile devices. These intermediaries calculate and broadcast correction values that compensate for GPS errors, thereby improving positioning accuracy without eliminating the underlying harmful factors
Solution Approach 2:
The system implements feedback by continuously measuring actual positioning errors using non-GPS positioning methods, calculating pseudorange corrections based on these errors, and broadcasting the corrections to mobile devices. This closed-loop feedback mechanism dynamically compensates for GPS inaccuracies in real-time
2Measurement precision
If non-GPS positioning data from sensors is used, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent enables mobile devices to self-determine their positions using onboard sensors (accelerometers, gyroscopes, magnetometers) and dead reckoning algorithms when GPS is unavailable or inaccurate. This self-service capability allows devices to maintain positioning functionality independently without relying on external infrastructure
Solution Approach 2:
The system performs preliminary positioning using non-GPS methods to establish accurate position information before GPS errors become problematic. This preliminary action creates a reference position that can be used to calculate pseudorange corrections and validate GPS measurements
Data Source
AI summary
A method comprising receiving, by an apparatus, global-positioning-system data from a plurality of global-positioning-system satellites, determining a measured satellite pseudorange for each global-positioning-system satellite of the plurality of global-positioning-system satellites based, at least in part, on the global-positioning-system data, receiving, by the apparatus, of non-global-positioning-system data from at least one sensor, determining an apparatus position of the apparatus based, at least in part, on the non-global-positioning-system data, the determination of the apparatus position being absent consideration of any global-positioning-system data, determining at least one pseudorange correction associated with at least one global-positioning-system satellite of the plurality of global-positioning-system satellites based, at least in part, on the measured satellite pseudorange and the apparatus position, and causing broadcast transmission of information indicative of the pseudorange correction is disclosed.