Vehicle Speed Determination via Stationary Object Communication
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Solution Overview
Problem
Existing methods for determining a vehicle's speed and position relative to its environment are prone to errors and are time-consuming, especially in urban environments where satellite data is unreliable, and they require tracking and evaluating stationary objects.
Innovation Solution
The method involves wireless vehicle-to-environment communication, where stationary objects transmit their non-movement information, allowing the vehicle to determine its speed and position relative to these objects using environmental data, and then converting this information into an absolute coordinate system for precise positioning and speed calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite-based navigation systems are used to determine vehicle position and speed, then position information can be obtained, but the data is unreliable in urban environments with high street canyons, leading to large errors
Solution Approach 1:
The patent introduces stationary objects (traffic lights, road signs, buildings) as intermediary reference points between the vehicle and satellite system. These objects receive satellite positioning data and relay it to the vehicle via V2X communication, creating a multi-hop positioning pathway that overcomes direct satellite signal blockage in urban canyons
Solution Approach 2:
The positioning system is segmented into multiple independent components: satellite positioning, stationary object positioning, and relative position calculation. Each component operates independently and can be validated against others, allowing the system to maintain reliability even when satellite data is unavailable by using stationary objects as alternative reference frames
2Measurement precision
If stationary objects are tracked and evaluated to determine vehicle speed and position, then relative position data can be obtained, but the process takes comparatively long time
Solution Approach 1:
The system performs preliminary actions by having stationary objects continuously maintain their position data and readiness to communicate. When a vehicle approaches, the objects are already positioned and prepared to provide reference data immediately, eliminating the need for real-time tracking and evaluation of stationary objects
Solution Approach 2:
Stationary objects autonomously determine and maintain their own position data using various sensors and communication systems. They self-service by continuously updating their position information and making it available to passing vehicles without requiring active tracking or evaluation by the vehicle system
3Measurement precision
If environmental sensors track and evaluate objects to determine vehicle speed and position, then position and speed data can be obtained, but the determined values are only known relative to the vehicle and are subject to errors
Solution Approach 1:
The system applies different quality standards to different reference objects. Stationary objects with known absolute positions (determined through multiple measurement techniques) serve as high-precision local reference frames. The vehicle calculates its position relative to these high-quality references, converting local relative measurements into absolute position information with higher reliability
Data Source
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AI summary
The invention relates to a method and to a device designed for performing the method for determining the speed of a vehicle (1). The vehicle has at least one environment sensor that determines environmental data of the vehicle (1) relative to at least one non-moving object (4, 7, 8). According to the invention, the at least one non-moving object (4, 7, 8) and the vehicle (1) participate in wireless vehicle-to-environment communication. At least the non-moving object (4, 7, 8) transmits information about the non-motion thereof, which information is received by the vehicle (1). From the environmental data of the vehicle (1) relative to the non-moving object (4, 7, 8), the motion of the vehicle (1) relative to the non-moving object (4, 7, 8) and therefrom the speed of the vehicle (1) and/or the position of the vehicle (1) relative to the non-moving object (4, 7, 8) are determined.