Vehicle Motion Control Using RTK-Based ODD Switching
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Solution Overview
Problem
Existing vehicle motion management systems rely on satellite-based positioning, which can be unreliable in areas without cellular coverage or GPS reception, leading to inaccuracies in determining vehicle motion parameters, affecting safety and efficiency.
Innovation Solution
Implementing a control unit that switches between RTK-enhanced and nominal operational design domains based on the availability of correction data, using multiple RTK receivers for redundancy and error detection, and employing a digital signal processor to determine kinematic parameters for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTK positioning is used to improve measurement precision, then position accuracy is improved, but system reliability deteriorates when correction data is unavailable
Solution Approach 1:
The system dynamically switches between RTK positioning mode and fallback positioning mode based on the availability of correction data. When correction data is available, the system uses RTK positioning for high precision; when unavailable, it automatically transitions to fallback mode using standard GPS positioning, ensuring continuous operational reliability without manual intervention.
Solution Approach 2:
The system changes the positioning parameter precision dynamically: using centimeter-level precision from RTK when correction data is available, and switching to meter-level precision from standard GPS when correction data is unavailable. This parameter adaptation allows the system to maintain reliability across varying operational conditions while maximizing measurement precision when possible.
2Productivity
If RTK-enhanced ODD is used to improve productivity, then operational efficiency is improved, but safety margins are reduced when RTK data is unavailable
Solution Approach 1:
The system dynamically adjusts the operational design domain based on positioning accuracy availability. When RTK correction data is available, the system activates RTK-enhanced ODD which allows more aggressive and efficient operations. When correction data is unavailable, it automatically switches to nominal ODD with conservative safety margins, ensuring safe operation under reduced precision conditions.
Solution Approach 2:
The system changes the operational parameters within the ODD based on positioning quality: using relaxed parameters that enable higher productivity when RTK precision is available, and switching to conservative parameters with larger safety margins when only standard GPS precision is available, thus adapting operational efficiency to actual measurement capabilities.
3Device complexity
If satellite-based positioning is used to determine vehicle motion state, then system complexity is reduced, but measurement precision deteriorates due to atmospheric conditions and signal multipath
Solution Approach 1:
The system introduces correction data from base stations as an intermediary element between the satellite signals and the positioning calculation. This correction data acts as a mediator that compensates for atmospheric conditions and signal multipath effects, significantly improving measurement precision while maintaining relatively simple system architecture by leveraging existing GPS infrastructure.
Data Source
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Figure 3A~3B
AI summary
A control unit for managing the motion of a vehicle via real-time kinematic (RTK) positioning is disclosed. The control unit comprises a vehicle state interface designed to retrieve state information from vehicle state sensors, including kinematic parameters and information about the availability of RTK correction data. The nominal operational design domains (ODDs) and corresponding RTK-enhanced ODDs are defined, wherein each nominal ODD maintains enhanced safety margins when contrasted with its RTK-enhanced counterpart. The control unit's functionality includes the selection of an active ODD based on availability of RTK correction data, selecting an RTK-enhanced ODD when such data is available, and selecting a nominal ODD when absent. The control unit subsequently directs the vehicle's motion using the kinematic parameters in alignment with the active ODD.