Vehicle Positioning Using Shared GPS Satellite Coordinates
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Solution Overview
Problem
Conventional vehicle positioning systems face accuracy issues when they move away from Roadside Units (RSU) due to decreased DGPS correction signals, leading to inaccurate positioning of traveling vehicles.
Innovation Solution
A vehicle positioning apparatus and method that calculates the position of a traveling vehicle based on shared GPS satellite coordinates and pseudo distances from a surrounding vehicle, using a communicator, GPS receiver, measurer, and controller to determine the vehicle's position without relying on DGPS interoperability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DGPS correction signal is used for vehicle positioning, then positioning accuracy is improved when near RSU, but positioning accuracy deteriorates when moving away from RSU
Solution Approach 1:
The patent uses surrounding vehicles as intermediary nodes to relay GPS satellite data and positioning information. Instead of relying solely on the RSU-DGPS infrastructure, the system creates a mesh network where vehicles share satellite coordinates and pseudo-distance measurements, enabling accurate positioning anywhere GPS signals are available, not just near RSUs
Solution Approach 2:
The patent combines multiple data sources including GPS satellite coordinates, pseudo-distance measurements from multiple satellites, and relative position data from surrounding vehicles. By merging these independent measurement systems, the patent achieves high-precision positioning that works independently of DGPS infrastructure coverage
2Device complexity
If conventional GPS positioning is used, then system complexity is reduced, but positioning accuracy deteriorates due to error range of 5-30m
Solution Approach 1:
The patent implements a feedback mechanism where positioning results from surrounding vehicles are continuously shared and used to refine the position calculation of the target vehicle. The controller receives positioning data from multiple sources, compares measurements, and iteratively improves accuracy by using the collective data from the vehicle network
Solution Approach 2:
The patent uses GPS satellite coordinates and orbital data that are publicly available and copied from standard GPS signals. By copying and processing these standard satellite ephemeris data along with pseudo-distance measurements, the system achieves high precision without requiring proprietary or complex hardware
Data Source
AI summary
A vehicle positioning apparatus and method are provided that are capable of more accurately measuring the position of a traveling vehicle without interoperating with a DGPS. The method includes calculating a position of the traveling vehicle based on coordinates of the respective GPS satellites shared by a surrounding vehicle and the traveling vehicle. In addition, a position coordinate is calculated of the surrounding vehicle measured by the reference of the traveling vehicle.