Conformal Map Projection for Global Vehicle Positioning
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately calculating and representing vehicle positions across different coordinate systems, particularly when transitioning between geographic and plane rectangular coordinate systems, leading to limitations in representing distances and directions, especially over large areas like the entire earth.
Innovation Solution
The implementation of a conformal map projection, such as the Mercator projection, which allows for the representation of most regions in a single system, eliminating the need for complex coordinate system transformations and enabling accurate vehicle position calculation and control by unifying the coordinate systems for both calculation and control processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If geographic coordinate system (latitude and longitude) is used to represent vehicle position, then the position can be represented globally, but the association with actual distances and directions measured by sensors becomes complex and inaccurate
Solution Approach 1:
The patent introduces a map coordinate system as an intermediary between the geographic coordinate system and the sensor measurement system. The map coordinate system serves as a mediator that can represent global positions while maintaining accurate associations with actual distances and directions, thereby resolving the contradiction between global adaptability and measurement precision
Solution Approach 2:
The patent transforms the coordinate system parameters from geographic coordinates (latitude and longitude) to map coordinates that are better suited for distance and direction calculations. This parameter change enables accurate association with sensor measurements while maintaining global position representation capabilities
2Ease of operation
If plane rectangular coordinate system is used for vehicle position calculation, then the association with actual distances and directions is simplified, but the representation range is limited to narrow areas
Solution Approach 1:
The patent creates a map coordinate system that combines the advantages of both geographic and plane rectangular coordinate systems. It achieves universality by enabling both simple distance and direction calculations (like plane rectangular system) and global position representation (like geographic system), thereby resolving the contradiction between ease of operation and adaptability
3Adaptability or versatility
If coordinate system transformation is performed between geographic and plane rectangular systems, then position representation flexibility is improved, but calculation complexity and errors increase
Solution Approach 1:
The patent extracts the coordinate transformation complexity by introducing a dedicated map coordinate system that is specifically designed for vehicle positioning. This separation allows the system to work primarily in the map coordinate system, taking out the need for frequent transformations between geographic and plane rectangular systems, thereby reducing calculation complexity and errors while maintaining flexibility
Data Source
AI summary
A vehicle control system includes an own vehicle position calculation section that calculates an own vehicle position on a map by using a coordinate system projected by a map projection method based on conformal map projection, which has conformality and represents most regions in the world with a single system, and a vehicle control section that controls a vehicle by using the own vehicle position calculated by the own vehicle position calculation section by using the coordinate system projected by the map projection method based on conformal map projection, which has conformality and represents most regions in the world with a single system.