Mobile Base Station Recalibration Using GPS Offset Correction
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Solution Overview
Problem
Autonomous vehicles face challenges in achieving precise location determination due to inaccuracies in GPS signals caused by timing, satellite orbits, and atmospheric conditions, especially in environments with dynamic obstacles like solar panels, where traditional GPS methods are insufficient for real-time navigation and site feature mapping.
Innovation Solution
A system that recalibrates a mobile base station by determining satellite-signal-accurate and near-survey-accurate locations using GPS signals and sensor data from autonomous vehicles, allowing for offset calculations to improve location accuracy for both the base station and detected objects, enabling precise navigation and mapping even when the base station moves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS signals are used for location determination, then the system can provide real-time location data, but the accuracy is affected by timing errors, satellite orbit variations, and atmospheric conditions
Solution Approach 1:
The patent introduces a base station as an intermediary that receives GPS signals and provides correction data to roving receivers. The base station acts as a mediator between the satellite signals and the mobile receivers, enabling differential GPS corrections to compensate for timing, orbital, and atmospheric errors, thereby improving location accuracy while maintaining real-time capability
Solution Approach 2:
The system implements feedback by continuously monitoring GPS signal errors at the base station location and transmitting correction data back to roving receivers. This closed-loop feedback mechanism allows the system to adapt to changing GPS signal conditions and maintain accurate location determination despite variations in satellite orbits, timing, and atmospheric conditions
2Adaptability or versatility
If a mobile base station is used to provide GPS corrections, then the system can serve multiple locations, but the base station requires frequent relocation and recalibration
Solution Approach 1:
The system performs preliminary action by establishing the base station at a new location and conducting calibration before serving roving receivers. This preliminary setup ensures that the base station is properly configured and providing accurate corrections from the outset, minimizing disruption and enabling quick deployment to multiple sites
Solution Approach 2:
The mobile base station performs self-service through automated calibration procedures that use pre-stored reference location data. The system automatically determines its own position relative to known reference points and generates appropriate correction data without requiring manual surveying or complex setup, significantly reducing the time needed for relocation and recalibration
3Adaptability or versatility
If the base station is relocated to a new position, then it can serve different areas, but the accuracy of location determinations may drift over time
Solution Approach 1:
The system implements periodic action by continuously updating calibration data at the mobile base station at predetermined intervals or when triggered by specific conditions. This periodic recalibration ensures that the base station maintains accurate location information despite relocation, preventing drift in location determination accuracy over time while allowing the station to serve multiple locations
Solution Approach 2:
Before the mobile base station relocates to a new position, the system performs preliminary calibration using pre-stored reference data for the new location. This advance preparation ensures that the base station is already calibrated and ready to provide accurate corrections immediately upon relocation, maintaining measurement precision across different areas without time loss
Data Source
AI summary
Disclosed is an approach for recalibrating a mobile base station (MBS) after it has moved to a non-survey location by determining a satellite-signal-accurate (SSA) location for the mobile base station based on GPS signals received by the mobile base station and further determining a near-survey-accurate (NSA) location for the mobile base station based on the determined SSA location for the mobile base station and applying an offset calculated by the navigational vehicle based on relatively fixed objects for which near-survey-accurate locations are known.