Train Speed Limit Retrieval via Coordinate Mapping
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Solution Overview
Problem
Existing traffic control solutions face inefficiencies in processing multiple temporary speed limit data points, leading to complex logical processing and low program efficiency due to frequent queries of electronic map data.
Innovation Solution
A method and apparatus that preprocess electronic map data by mapping track sections to a coordinate system, storing speed limit data in separate lists, and combining them to create a strictest speed limit list, allowing for efficient retrieval of area speed limit values without needing to query the map for each temporary speed limit packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temporary speed limit data points are processed by frequently querying electronic map data, then accurate speed limit values can be obtained, but logical processing becomes complex and program efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-processing electronic map data before runtime operations. Specifically, track sections are mapped to a coordinate system in advance, and speed limit data is pre-stored in separate lists (temporary speed limit information list and constant speed limit information list) in a one-to-one correspondence mode. This preprocessing eliminates the need for frequent electronic map queries during operation, thereby improving program efficiency while maintaining accurate speed limit value retrieval through the pre-organized data structures.
2Loss of information
If electronic map data is queried frequently for each temporary speed limit packet, then complete speed limit information can be retrieved, but logical processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing speed limit information into distinct components: temporary speed limit data and constant speed limit data. Each type is stored in separate lists (temporary speed limit information list and constant speed limit information list) with established one-to-one correspondence. This segmentation allows the system to process and retrieve speed limit information without requiring complex electronic map queries, as the data is already organized in accessible, structured formats that maintain information completeness while simplifying logical processing.
Data Source
AI summary
The present disclosure provides a method for obtaining an area speed limit value. The method includes: mapping, to a coordinate system, a track section on a train running line in electronic map data; respectively storing, into a temporary speed limit information list and a constant speed limit information list in a one-to-one correspondence mode, speed limit data of a temporary speed limit and speed limit data of a constant speed limit of the train in the track section according to coordinates of the track section in the coordinate system; combining speed limit data in the temporary speed limit information list with speed limit data in the constant speed limit information list to obtain a strictest speed limit list of the train; and obtaining, by searching the strictest speed limit list, a strictest speed limit value of an area corresponding to a real-time coordinate position of the train.