Satellite Signal Calibration Using Vehicle Sensor Data
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Solution Overview
Problem
Satellite positioning systems face inaccuracies due to weather, atmospheric conditions, and obstructions, leading to positioning errors that can range from meters to tens of meters, necessitating compensation for timing errors in satellite signals to improve location determination.
Innovation Solution
A sensor-based vehicle registration system that uses on-board sensors like cameras and rangefinders to determine vehicle location and calculate timing offsets for satellite signals, providing differential corrections to satellite receivers to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If satellite signals are used for positioning, then positioning coverage is improved, but positioning accuracy deteriorates due to weather, atmospheric conditions, and obstructions
Solution Approach 1:
The patent introduces an intermediary calibration system that mediates between satellite signals and the positioning receiver. This calibration system uses multiple sensors (cameras, rangefinders, accelerometers, gyroscopes) to independently determine vehicle position and orientation, then uses this information to calculate timing offsets that correct satellite signal measurements, thereby resolving the accuracy problem while maintaining wide coverage
Solution Approach 2:
The patent implements feedback by continuously comparing sensor-based position estimates with satellite-based position estimates, calculating timing offsets from the differences, and applying these offsets to correct subsequent satellite signal measurements. This closed-loop feedback mechanism systematically compensates for atmospheric and obstruction-related errors
2Measurement precision
If timing offsets are calculated using sensor data, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the vehicle's existing sensor system (cameras, rangefinders, accelerometers, gyroscopes) multi-functional by using it not only for its primary navigation and safety functions but also for satellite signal calibration. This universal use of existing components improves positioning accuracy without adding dedicated calibration hardware, thereby limiting complexity increase
Solution Approach 2:
The patent merges the satellite positioning function with the sensor-based navigation function into a unified calibration system. By combining data from multiple sensor types and integrating them with satellite signal processing, the system achieves high accuracy while using shared computational resources and unified architecture, reducing overall system complexity
Data Source
AI summary
A satellite signal calibration system can receive sensor data from one or more sensors provided on a vehicle and detect satellite signal from one or more satellites of a satellite positioning system. Using the sensor data, the system can perform a localization operation to determine a current location of the vehicle. The system may then determine timing offsets of the satellite signals from each of the one or more satellites based at least in part on the current location of the vehicle.