In-Vehicle ECU Position Estimation Using Vehicle Movement Detection
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Solution Overview
Problem
The existing PPP positioning method requires about 20 minutes for initial convergence, limiting the functionality of advanced drive assist systems during this time and impairing the merchantability of vehicles.
Innovation Solution
An in-vehicle electronic control unit that includes a positioning calculation unit, a vehicle movement detection unit, and an own vehicle movement determination unit, which determines whether the vehicle has moved while stopped and uses this information to perform high-speed initial convergence of PPP positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PPP positioning method is applied to achieve high positioning accuracy, then positioning precision is improved, but initial convergence time increases significantly (about 20 minutes)
Solution Approach 1:
The system performs preliminary actions by detecting vehicle movement state before positioning calculation, determining whether the vehicle is stopped or moving, and preparing appropriate positioning strategies in advance. This preliminary detection and determination process enables the system to switch between different positioning modes quickly, avoiding the full 20-minute convergence time required by traditional PPP positioning.
2Measurement precision
If PPP positioning is used from vehicle startup, then positioning accuracy is achieved, but advanced drive assist function availability is delayed
Solution Approach 1:
The system dynamically adjusts positioning strategy based on real-time vehicle movement state. When the vehicle is stopped, it uses stopped-position-based estimation for rapid positioning. When the vehicle moves, it switches to movement-based positioning. This dynamic adaptation enables the advanced drive assist functions to become available immediately after startup, significantly improving function availability speed while maintaining positioning accuracy.
Data Source
AI summary
An in-vehicle electronic control unit includes: a positioning calculation unit that acquires GNSS information and acquires positioning information of an own vehicle; a vehicle movement detection unit that detects movement of the own vehicle; and an own vehicle movement determination unit that estimates movement while a vehicle system is stopped, in which the own vehicle movement determination unit determines whether the own vehicle has moved while the vehicle system is stopped, and based on a determination result as to whether the own vehicle has moved, determines whether the positioning calculation unit estimates a current position of the own vehicle by using a position of the own vehicle when the vehicle system is stopped.