V2X Device Positioning via Distributed Antenna TDoA
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Solution Overview
Problem
Current methods for determining the position of a vehicle-to-everything (V2X) device using road side units (RSUs) lack accuracy, particularly in measuring the location based on time difference of arrival (TDoA) signals from multiple RSUs.
Innovation Solution
A method involving a V2X device with two antennas distributed a predetermined distance apart, measuring the TDoA of signals from two RSUs, calculating hyperbolas based on these TDoAs, and determining the device's position by intersecting the hyperbolas after applying offsets to accurately match the vehicle's location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TDoA-based positioning method is used with multiple RSUs, then positioning capability is enabled, but positioning accuracy is insufficient
Solution Approach 1:
The patent transitions from traditional 2D positioning methods to 3D positioning by incorporating vertical height information. The V2X device determines not only horizontal coordinates but also vertical height by calculating distance differences between multiple antennas and RSUs, adding a dimensional aspect to improve positioning accuracy and reliability simultaneously
Solution Approach 2:
The patent divides the positioning system into multiple distributed antennas (first antenna and second antenna) within the V2X device. Each antenna independently measures TDoA to different RSUs, and the results are combined to calculate both horizontal position and vertical height, achieving more accurate positioning through segmented measurement
2Measurement precision
If two antennas are distributed a predetermined distance apart, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The distributed antennas serve multiple functions: they are used for both conventional wireless communication and for TDoA-based positioning measurements. The same antenna array that enables communication diversity also provides the spatial baseline needed for accurate positioning, eliminating the need for separate dedicated positioning hardware
Solution Approach 2:
The patent merges the communication function and positioning function into a single integrated system. The antennas are used simultaneously for receiving communication signals and for measuring TDoA of positioning signals from RSUs, combining two functions into one unified approach
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the accuracy of positioning measurements by accurately matching the intersection of hyperbolas with the vehicle's specific location, enhancing the precision of V2X communication systems.
Implementation Method 1
measuring a first time difference of arrival (TDoA), which is a difference in reception time of the first signal between the first antenna and the second antenna, and a second TDoA, which is a difference in reception time of the second signal between the first antenna and the second antenna
Data Source
AI summary
Disclosed are a method and apparatus for determining a position of a Vehicle-to-Everything (V2X) device in a wireless communication system according to various embodiments. Disclosed are a method and apparatus, the method comprising the steps of: receiving a first signal from a first road side unit (RSU) and a second signal from a second RSU through a first antenna and a second antenna distributed over a predetermined distance; measuring a first time difference that is a reception time difference for the first signal and a second time difference that is a reception time difference for the second signal between the first antenna and the second antenna; and determining the position of the V2X device on the basis of the first time difference and the second time difference.