Sensing Synchronization Using Multipath Reflection Geometry
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Solution Overview
Problem
In complex multipath environments, determining a direct path between two base stations for synchronization is difficult, hindering accurate synchronization and distance measurement in ubiquitous sensing applications.
Innovation Solution
A method for sensing synchronization that involves determining transmitting and receiving angles and times of sensing signals, calculating theoretical reflection positions, and selecting primary path distance differences to determine synchronization errors, allowing accurate synchronization even in complex environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional direct path detection methods are used for synchronization, then synchronization accuracy can be maintained in simple environments, but the method fails in complex multipath environments where direct paths are difficult to determine
Solution Approach 1:
The patent converts the harmful multipath effect into a beneficial resource by using reflected signals to determine synchronization. Instead of treating multipath reflections as interference to be eliminated, the method calculates theoretical reflection positions and compares them with actual signal arrival positions, thereby converting the previously harmful reflected signals into useful synchronization information that works effectively in complex environments.
Solution Approach 2:
The patent changes the approach from directly detecting signal paths to calculating and comparing distance differences. By introducing the parameter of distance difference (difference between time distance and position distance) and using thresholds to identify primary path signals, the method adapts to complex environments where direct path detection fails.
2Quantity of substance
If all sensing signals are used for synchronization calculation, then more data is available, but measurement accuracy decreases due to inclusion of multipath signals
Solution Approach 1:
The patent extracts only the useful primary path signals from the mixture of direct and reflected signals. By calculating theoretical reflection positions and comparing them with actual signal positions, the method identifies and extracts primary path signals that meet the distance difference threshold criteria, excluding multipath interference signals from the synchronization calculation.
Solution Approach 2:
The patent applies different quality criteria to different signals based on their characteristics. Each sensing signal is evaluated individually using the distance difference method, and only signals whose reflection positions match theoretical positions within acceptable thresholds are selected for synchronization calculation, ensuring high precision while utilizing multiple signals.
3Ease of manufacture
If direct path detection is assumed to work, then synchronization can be achieved in line-of-sight conditions, but the method becomes unreliable in non-line-of-sight multipath environments
Solution Approach 1:
The patent segments the signal analysis process into distinct steps: calculating theoretical reflection positions, determining actual signal positions, calculating distance differences, comparing with thresholds, and identifying primary path signals. This segmentation makes the complex multipath environment handling as systematic and reliable as simple direct path detection, while maintaining implementation feasibility.
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
Enables accurate synchronization and distance measurement in complex multipath environments, providing a reliable basis for ubiquitous sensing applications.
Implementation Method 1
determining a theoretical reflection position of the sensing signal, according to position of a transmitting end, position of a receiving end, the receiving angle of the sensing signal and the transmitting angle of the sensing signal
Implementation Method 2
the time distance is a transmission distance of the sensing signal between the transmitting time and the receiving time
Data Source
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AI summary
Provided in the present disclosure is a method for sensing synchronization. The method comprises: determining a transmitting time, a transmitting angle, a receiving time and a receiving angle of a plurality of sensing signals; determining a theoretical reflection position of the sensing signal, according to position of a transmitting end, position of a receiving end, the receiving angle of the sensing signal and the transmitting angle of the sensing signal; determining a distance difference of the sensing signal, wherein the distance difference is an absolute value of a difference between a time distance and a position distance of the sensing signal, the time distance is a transmission distance between the time of transmitting the sensing signal and the time of receiving the sensing signal, and the position distance is the sum of a distance between the theoretical reflection position of the sensing signal and the receiving end and a distance between the theoretical reflection position of the sensing signal and the transmitting end; selecting a primary path distance difference from the distance differences; and determining, according to the primary path distance difference, a synchronization error between the transmitting end and the receiving end. Further provided in the present disclosure are a device for sensing synchronization and a computer-readable medium.