Vehicle Position Estimation Using Wireless Feedback for Cornering Accuracy
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Solution Overview
Problem
Existing vehicle position estimation methods, such as dead reckoning and satellite positioning, struggle to achieve high accuracy, especially in estimating two-dimensional directions of cornering due to variations in vehicle specifications and the lack of consideration for cornering movements.
Innovation Solution
An own-vehicle position estimation device that incorporates a wireless position estimation unit for communicating with external wireless devices to calculate relative positions and corrects parameters using a position estimation parameter correction unit, integrating information from internal sensors like wheel speed and steering angle to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dead reckoning is used to estimate vehicle position using internal sensors, then the system can operate without external sensors, but the position estimation accuracy deteriorates due to vehicle specification variations and tire state changes
Solution Approach 1:
The patent implements a feedback mechanism where the vehicle position estimation unit continuously compares the dead reckoning calculated position with the actual position obtained from wireless beacon communication. The position estimation parameter correction unit uses this feedback to correct parameters such as vehicle movement distance and cornering angle, thereby improving measurement precision while maintaining system reliability through internal sensor usage.
2Measurement precision
If beacon distance calculation is used to correct movement distance, then one-dimensional distance accuracy improves, but two-dimensional cornering direction estimation remains inaccurate
Solution Approach 1:
The patent extends the correction approach from one-dimensional distance to two-dimensional spatial estimation by introducing cornering angle correction. The position estimation parameter correction unit not only corrects movement distance based on beacon communication but also corrects cornering angles by comparing dead reckoning calculations with actual positional changes, thereby recovering lost cornering direction information.
3Ease of operation
If vehicle specification parameters are used for dead reckoning calculation, then the system can estimate position using only internal sensors, but errors accumulate due to manufacturing variations and tire wear
Solution Approach 1:
The patent dynamically adjusts dead reckoning parameters based on actual vehicle behavior observed through wireless position estimation. The position estimation parameter correction unit modifies parameters such as vehicle movement distance and cornering angle by comparing calculated values with actual values obtained from beacon communication, thereby compensating for manufacturing variations and tire wear while maintaining operational simplicity.
Data Source
AI summary
Provided are an own-vehicle position estimation device and an own-vehicle position estimation method which are capable of estimating the position of an own vehicle with high accuracy, including not only one-dimensional distances of movement but also two-dimensional directions of cornering. There are provided a vehicle position estimation unit 2 for calculating the position of a vehicle based on an output from a sensor for detecting a behavior of the vehicle, a wireless position estimation unit 1 for communicating with a wireless device 101 installed at an arbitrary position and for calculating the relative positions of the vehicle and the wireless device 101, and a position estimation parameter correction unit 3 for correcting parameters used for calculating at least the position of the vehicle and information about the cornering angle of the vehicle by the vehicle position estimation unit 2. The position estimation parameter correction unit 3 compares an amount of movement of the vehicle calculated by the wireless position estimation unit 1 with an amount of movement of the vehicle calculated by the vehicle position estimation unit 2, and corrects the parameters.