Autonomous Vehicle Navigation After GPS Loss Using Stop-Point Calibration
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Solution Overview
Problem
Existing autonomously controlled vehicles face challenges in navigating and safely operating when their positioning systems lose location, necessitating improved methods to ensure continued functionality and safety.
Innovation Solution
A method involving a sensor to measure angular velocity is used to generate stop positions along a road path, allowing the vehicle to autonomously navigate to these positions for sensor calibration, ensuring safe stand-still operations and continuous operation towards the destination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the vehicle operates autonomously without substantial operator interference, then automation level is improved, but safety and reliability deteriorate when positioning systems lose location
Solution Approach 1:
The system pre-generates a plurality of stop positions along the road path before navigation begins. When GPS signal is lost, the vehicle can immediately navigate to the first upcoming stop position using pre-calculated angular velocity data, without needing to compute stop positions in real-time during the emergency situation.
Solution Approach 2:
Angular velocity data from sensors serves as an intermediary measurement that enables navigation without direct GPS positioning. The system uses this intermediate physical quantity to calculate vehicle position and guide the vehicle to stop positions when the primary positioning system fails.
2Productivity
If the vehicle continues operation without stopping for sensor calibration, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The system implements periodic sensor calibration by automatically navigating the vehicle to predetermined stop positions at intervals along the road path. At each stop position, the vehicle pauses to perform sensor calibration, then continues operation. This periodic interruption maintains measurement precision while allowing substantial continuous operation.
3Reliability
If the vehicle navigates to stop positions using angular velocity data when GPS is lost, then reliability is improved, but device complexity increases
Solution Approach 1:
The system replaces GPS satellite-based positioning with a mechanical sensor-based angular velocity measurement system. By using onboard sensors to measure angular velocity and calculate position through integration, the system substitutes an external satellite-dependent system with an autonomous mechanical measurement system that functions independently of GPS signals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the vehicle to maintain functionality by calibrating sensors at safe stop positions, reducing the risk of accidents and ensuring safe navigation even when GPS signal loss occurs.
Implementation Method 1
a sensor arranged to measure an angular velocity of the vehicle in at least one direction during operation
Data Source
AI summary
The present disclosure relates to method for controlling a driving operation of an autonomously controlled vehicle. In particular, a navigation system is controlled to autonomously operate the vehicle in a direction from a position of loss of location to a first upcoming stop position; and to controlling the vehicle to a stand-still operation when the vehicle arrives at the stop position for calibration of a sensor arranged to measure an angular velocity of the vehicle.