Interferometric Terminal Positioning for Line-Shaped Areas
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Solution Overview
Problem
Existing positioning methods are slow and inefficient in determining whether a terminal is within a line-shaped area, such as a railway track, while maintaining sufficient precision.
Innovation Solution
The method employs interferometric positioning using satellite signals and a processor that calculates an estimated coordinate, determines the line direction, and uses RTK calculation to assess if the terminal is within a line-shaped area, even if the fix solution is not immediately acquired, by utilizing a float solution and geographic database to increase positioning speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTK technique is used to calculate remote distance for precise positioning, then positioning precision is improved, but positioning speed deteriorates
Solution Approach 1:
The patent applies partial action by determining only whether the terminal is within the line-shaped area (binary classification) rather than calculating the exact position. This is achieved by comparing the distance to the line center with half the line width, which provides sufficient precision for safety determination while significantly reducing computational complexity and improving positioning speed.
Solution Approach 2:
The patent extracts only the essential information needed for safety determination (whether the terminal is within the line area) from the full positioning data. By using the distance to line center and comparing it with half the line width, the system extracts just the critical spatial relationship information without performing complete RTK positioning calculations, thus improving speed while maintaining sufficient precision.
2Measurement precision
If complete area definition is required for positioning determination, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential geometric parameters (line center coordinates and line width) from the complete area definition. Instead of requiring full area boundary definitions or complex polygon data, the system uses simplified line-shaped area representation with center line and width parameters, reducing data complexity while maintaining positioning determination accuracy.
Solution Approach 2:
The patent changes the parameter representation from complete area boundary definitions to simplified parameters (line center coordinates and line width). This parameter transformation simplifies the data structure and computational requirements while preserving the ability to accurately determine whether the terminal is within the area, thus reducing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for faster positioning while maintaining sufficient precision, enabling the terminal to determine if it is within a line-shaped area, without requiring the user to define the entire area, and reduces the time needed for positioning.
Implementation Method 1
The processor receives a plurality of positioning signals from a plurality of satellites, and performs positioning of a location of the terminal through interferometric positioning
Data Source
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AI summary
In a positioning method and a terminal according to the present disclosure, a processor positions a location of the terminal through interferometric positioning using a plurality of positioning signals received from a plurality of satellites. The processor calculates an integer bias for the plurality of positioning signals, selects a group of location candidates based on a float solution acquired through the calculation of the integer bias, and notifies that the terminal is located at a predetermined point on a map under a condition in which the group of location candidates is included in a line-shaped area.