Terminal Positioning via Time-Synchronized Phase Difference Measurement
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Solution Overview
Problem
Existing positioning technologies, such as CPD and RTK, suffer from positioning errors due to deviations in the initial phase of the terminal device when measuring reference signals from different transmission points at varying times.
Innovation Solution
The method involves controlling the measurement times of reference signals from different transmission points to ensure they are measured within a predetermined duration, reducing the error in phase difference and improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If reference signals from different transmission points are measured at different times, then the positioning system can operate with flexible timing, but positioning accuracy deteriorates due to initial phase deviations
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the measurement timing of reference signals from different transmission points. The terminal device is configured to measure reference signals within a predetermined time window, ensuring that measurements are performed at substantially the same time before initial phase deviations can significantly impact the phase difference calculations. This pre-planned timing synchronization eliminates positioning errors while maintaining operational simplicity.
2Duration of action of moving object
If the time interval between measuring reference signals is extended, then the measurement process becomes more flexible, but positioning accuracy deteriorates due to increased initial phase deviation errors
Solution Approach 1:
The patent applies parameter changes by strictly controlling the time interval parameter between measurements. A predetermined duration threshold is established, and the terminal device is configured to reject or correct phase difference measurements when the time interval between reference signal measurements exceeds this threshold. This parameter-based control ensures that measurements are performed within a time window small enough to minimize initial phase deviation impacts, thereby maintaining high positioning accuracy.
3Productivity
If phase difference measurements are performed without time synchronization, then the positioning system can process signals independently, but positioning accuracy deteriorates due to initial phase deviations
Solution Approach 1:
The patent applies feedback by implementing a time synchronization check mechanism. The terminal device monitors the time interval between measurements of reference signals from different transmission points and provides feedback when this interval exceeds the predetermined duration. Based on this feedback, the system either rejects the measurements or triggers a re-synchronization process, ensuring that only time-synchronized measurements are used for positioning calculations. This feedback loop maintains positioning accuracy while allowing independent signal processing within the synchronized time window.
Data Source
AI summary
The present disclosure provides a method for positioning, a terminal device, and a positioning device. One example method includes: receiving a first reference signal transmitted by a first transmission point; measuring the first reference signal to obtain a first phase observation value; receiving a second reference signal transmitted by a second transmission point; measuring the second reference signal to obtain a second phase observation value; and determining a phase difference based on the first phase observation value and the second phase observation value, wherein the phase difference is used to determine a position of a terminal device.