Vehicle Route Length Determination Using Turn-Off Routes
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Solution Overview
Problem
Current digital road map systems inaccurately calculate vehicle route lengths due to idealized representations of roads, which do not account for real road widths and turn-off routes at intersections, leading to significant measurement errors.
Innovation Solution
A method that considers real road widths and turn-off routes by calculating the angle between road segments and assuming a road width, allowing for a more accurate route length determination by modeling the road network with realistic turn-off routes, and optionally pre-calculating and storing turn-off routes in a table for faster processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If idealized linear road segments are used in digital road maps, then storage requirements are reduced and map simplification is achieved, but route length measurement accuracy deteriorates significantly
Solution Approach 1:
The road network is segmented into road segments with associated turn-off routes at intersections. Each road segment is represented as a linear element, but turn-off routes are added as separate computational components to account for real-world road widths and intersection geometries, thereby improving measurement accuracy without significantly increasing overall system complexity
Solution Approach 2:
Turn-off routes are pre-calculated and stored in a table during map preparation. This preliminary computation allows the system to use simplified linear road segments for storage while having accurate turn-off route data readily available for route length calculations, resolving the contradiction between storage simplicity and measurement accuracy
2Measurement precision
If turn-off routes are calculated in real-time during route length determination, then measurement accuracy is improved, but processing time increases
Solution Approach 1:
All turn-off routes are pre-calculated based on the digital road map geometry and stored in a lookup table during map preparation. During real-time route length determination, the system simply retrieves pre-computed turn-off route lengths from the table based on the sequence of road segments, achieving both high measurement accuracy and fast processing without real-time computational overhead
Data Source
AI summary
A method for determining the length of the route travelled by a vehicle using a position measuring device that records positions of the vehicle and a digital road map, which is composed of road segments of known segment lengths. The method including recording positions of the vehicle on the route by means of the position measuring device, matching the recorded vehicle positions to a sequence of road segments, and determining the route length from the segment lengths of these road segments, wherein from the angle between at least two consecutive road segments and an assumed road width of the two road segments, a turn-off route of the vehicle from the one road segment into the other road segment is calculated. The calculated turn-off route is taken into consideration in the determination of the route length.