Vehicle Position Calculation Using Advancing Direction Detection
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Solution Overview
Problem
Existing vehicle position calculation techniques fail to accurately account for the orientation of the vehicle when calculating its current position, leading to potential errors.
Innovation Solution
A vehicle position calculating apparatus and method that includes reference positional information acquisition, advancing direction detection, and relative change detection to calculate the vehicle's position based on its advancing direction and running state, considering the orientation at the reference position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the autonomously traveled moving direction and distance are simply added to the positional information to calculate the current position, then the calculation process is simple, but the calculated vehicle position incurs greater error when the vehicle orientation at the reference position is not aligned with the coordinate system
Solution Approach 1:
The patent applies preliminary action by detecting the vehicle's advancing direction at the reference position before performing the position calculation. This preliminary detection of orientation information allows the subsequent calculation to properly account for the vehicle's heading, thereby resolving the accuracy issue without significantly complicating the overall process.
Solution Approach 2:
The patent changes the parameters used in the position calculation by incorporating the vehicle's advancing direction (orientation parameter) in addition to the simple displacement components. This parameter expansion transforms the calculation from a basic coordinate addition to a more comprehensive calculation that respects the vehicle's actual orientation, thereby improving accuracy.
2Productivity
If the vehicle position is calculated without considering the vehicle's advancing direction, then the calculation method is simple and quick, but the position accuracy deteriorates when the vehicle is oriented at an angle to the coordinate system
Solution Approach 1:
The system performs preliminary detection of the vehicle's advancing direction at the moment the reference position is acquired. This pre-detection step captures the orientation information that will be used in the calculation, allowing the main calculation process to remain efficient while incorporating the necessary directional data for accuracy.
Solution Approach 2:
The advancing direction detection mechanism serves multiple functions: it provides the orientation information needed for accurate position calculation, and it can also be used for other navigation and control purposes. This multi-functionality justifies the additional detection step by providing broader utility beyond just position calculation accuracy.
Data Source
AI summary
A vehicle position calculating apparatus and vehicle position calculating method which can accurately calculate a current position of a vehicle regardless of the orientation of the vehicle at the time when acquiring positional information.An advancing direction detecting section in a vehicle position calculating ECU detects an advancing direction of a vehicle in a receiving area according to receiving area form information issued from a receiving area form acquiring section, moving distance information issued from a moving distance calculating section, and course change information issued from a course changing action detecting section. A vehicle position calculating section sets a reference position according to reference positional information issued from a reference position acquiring section, and calculates the current vehicle position by taking account of the advancing direction in addition to a relative change based on relative change information issued from the relative position change detecting section.