C-V2X Ranging for GPS Position Accuracy in Tunnels
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Solution Overview
Problem
Position accuracy in C-V2X technology is compromised by weak GPS signals, particularly in environments like tunnels, where traditional GPS receivers struggle to determine location accurately.
Innovation Solution
Implementing ranging over the C-V2X communication channel by using a C-V2X device in a vehicle to communicate with a base station or road side unit with known locations, calculating displacement offsets based on signal time of arrival, and combining this information with GPS data and vehicle sensor inputs for enhanced location accuracy using dead reckoning algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS receiver is used for position determination, then position information can be obtained, but position accuracy deteriorates in environments with weak GPS signals such as tunnels
Solution Approach 1:
The patent combines GPS positioning with C-V2X ranging technology to create a hybrid positioning system. The C-V2X device receives signals from base stations with known locations and calculates displacement offsets, which are then integrated with GPS data through dead reckoning algorithms to achieve centimeter-level accuracy even when GPS signals are weak or unavailable.
Solution Approach 2:
The patent introduces C-V2X base stations and road side units as intermediary reference points for position determination. These intermediaries provide known location references that enable accurate positioning through signal time of arrival measurements, compensating for GPS signal deficiencies in tunnel environments.
2Measurement precision
If C-V2X ranging is implemented to improve position accuracy, then centimeter-level precision can be achieved, but system complexity increases due to integration of multiple positioning technologies
Solution Approach 1:
The C-V2X communication device performs multiple functions: it communicates with base stations for ranging, receives GPS signals, and processes data from other vehicle sensors. This multi-functionality allows the system to achieve high positioning accuracy without requiring separate dedicated hardware for each positioning method, thereby managing system complexity.
Solution Approach 2:
The system uses the vehicle's existing C-V2X communication infrastructure and onboard sensors to provide positioning functionality. By leveraging already-present components for multiple purposes (communication, sensing, and positioning calculations), the patent reduces the need for additional specialized hardware, thus controlling system complexity while achieving high accuracy.
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 improves GPS location accuracy from meters to centimeter-level precision, essential for safety applications in connected vehicle systems.
Implementation Method 1
knowing the time of arrival of the signal, one can calculate the displacement offset from the last reference point when this calculation was last performed
Data Source
AI summary
On-hoard equipment in a motor vehicle includes a C-V2X communication device receiving a first signal from road side equipment having a known position. The C-V2X communication device transmits a second signal having content that is dependent upon a length of time in which the first signal traveled from the road side equipment to the C-V2X communication device. A GPS device is communicatively coupled to the C-V2X communication device and receives the second signal from the C-V2X communication device. The GPS device estimates a position of the vehicle. The estimating is dependent upon the second signal from the C-V2X communication device.