Vehicle Key Positioning Using LOS Anchor Point Selection
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Solution Overview
Problem
Inaccurate positioning of vehicle keys due to non-line-of-sight (NLOS) wireless transmission in existing key positioning methods affects the user experience of vehicles with senseless control technologies like Passive Entry Passive Start (PEPS).
Innovation Solution
Determine line-of-sight (LOS) reference anchor points based on distances between positioning anchor points and the key, perform coordinate system transformation to obtain accurate key positions in a vehicle's coordinate system, and execute operations based on these coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If least squares method is used for position calculation based on distance information from all positioning anchor points, then positioning function is achieved, but positioning accuracy deteriorates due to NLOS transmission
Solution Approach 1:
The patent extracts and identifies LOS reference anchor points from the set of all positioning anchor points by analyzing transmission modes. Only distance information from these extracted LOS reference anchor points is used for position calculation, excluding NLOS anchor points that would degrade accuracy. This is implemented by determining transmission modes for each anchor point and selecting only those with LOS mode for the positioning calculation.
2Measurement precision
If distance information from all positioning anchor points is used, then complete coverage is achieved, but positioning accuracy deteriorates due to inclusion of NLOS transmission data
Solution Approach 1:
The patent converts the harmful effect of NLOS transmission into a beneficial selection criterion. By analyzing transmission modes and identifying LOS reference anchor points, the system transforms the problem of having too much data (including bad NLOS data) into a benefit of having filtered, high-quality LOS data. The transmission mode analysis converts potentially harmful NLOS distance information into useful metadata for filtering, leaving only beneficial LOS data for positioning.
Data Source
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AI summary
A vehicle key positioning method, an apparatus and a storage medium. The method includes: after a vehicle completes a communication connection with a key of the vehicle, determining respective distances between a plurality of positioning anchor points of the vehicle and the key based on respective ranging signals between the plurality of positioning anchor points and the key; based on the respective distances between the plurality of positioning anchor points and the key, determining at least two reference anchor points from the plurality of positioning anchor points, where a reference anchor point indicates that a ranging signal transmission mode between the reference anchor point and the key is line-of-sight (LOS) wireless transmission; based on respective distances between the determined reference anchor points and the key, determining a first coordinate of the key in a local coordinate system corresponding to the determined reference anchor points; performing coordinate system transformation processing on the first coordinate, so as to acquire a second coordinate of the key in a preset coordinate system of the vehicle; and according to the second coordinate, if it is determined that the key is in a function area of the vehicle, executing a preset operation corresponding to the function area. By means of the method, the problem of inaccurate positioning existing in key positioning methods in the prior art is solved.