V2X Positioning Reference Signals for GNSS-Denied Localization
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Solution Overview
Problem
Conventional positioning methods based on Global Navigation Satellite System (GNSS) fail in areas with poor or no GNSS signal coverage, leading to inaccurate or impossible positioning.
Innovation Solution
A method involving periodic broadcasting and feedback of Positioning Reference Signals (PRS) between devices to determine position, utilizing time and resource management to enhance positioning accuracy in GNSS-denied environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GNSS positioning method is used, then positioning can be performed in open areas, but positioning fails in areas with poor or no GNSS signal coverage
Solution Approach 1:
The patent introduces Positioning Reference Signals (PRS) as an intermediary mechanism between devices to enable positioning in GNSS-denied environments. The PRS allows devices to measure time differences of signal arrival and calculate positions based on these measurements, serving as a mediator that replaces GNSS dependency with direct device-to-device signal exchange for positioning purposes
2Measurement precision
If PRS broadcasting is performed frequently to improve positioning accuracy, then positioning precision increases, but communication delay increases
Solution Approach 1:
The patent implements periodic broadcasting of Positioning Reference Signals at optimized intervals. This periodic action allows the system to achieve positioning accuracy through regular signal exchanges while controlling communication delay by adjusting the broadcasting frequency to be sufficient for accuracy but not excessive to cause unacceptable latency
Solution Approach 2:
The patent employs feedback mechanisms where devices report their measurements and positions back to the network or other devices. This feedback loop allows the system to refine positioning accuracy over time through accumulated measurements while managing communication overhead by only transmitting necessary correction or update information rather than continuous data streams
3Measurement precision
If device identification information is explicitly transmitted for positioning, then positioning accuracy improves, but device privacy is compromised
Solution Approach 1:
The patent extracts only the essential positioning-related information from device data transmissions. Instead of transmitting full device identification information, the system transmits only the minimum necessary data for positioning calculations (such as signal arrival times and anonymized device identifiers), separating positioning functionality from personal identifiable information to maintain accuracy while protecting privacy
Data Source
AI summary
A position determination method, apparatus, and V2X device are provided. The method applied to a first device includes: periodically broadcasting a first Positioning Reference Signal PRS; receiving a second PRS fed back according to the first PRS by a second device; transmitting a third PRS to the second device according to the second PRS; wherein, the second device determines a position based on the first PRS, the second PRS, and the third PRS.