UWB Positioning Correction for NLOS Accuracy
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Solution Overview
Problem
UWB devices experience poor positioning accuracy due to environmental factors such as temperature, humidity, electromagnetic interference, and non-line of sight (NLOS) conditions, which significantly affect wireless signals and lead to measurement errors exceeding a meter level.
Innovation Solution
A positioning method that involves obtaining integrated signal strength and first-path signal strength, determining an initial distance value, and calculating a correction distance value to correct the initial distance value and position information, thereby improving positioning accuracy in NLOS environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UWB devices use wireless electromagnetic waves for ranging/positioning, then positioning function is achieved, but positioning accuracy deteriorates due to environmental factors such as temperature, humidity, electromagnetic interference, and NLOS conditions
Solution Approach 1:
The patent introduces a correction mechanism as an intermediary between the raw signal strength measurement and the final positioning result. By comparing integrated signal strength with first-path signal strength and calculating correction values, the system mediates the impact of environmental factors and NLOS conditions, transforming inaccurate measurements into corrected positioning data that maintains reliability while improving accuracy
Solution Approach 2:
The patent implements a feedback loop where the system continuously compares different signal strength measurements (integrated vs. first-path), calculates correction values based on the difference, and applies these corrections to improve positioning accuracy. This feedback mechanism allows the system to adapt to changing environmental conditions and compensate for errors in real-time
2Measurement precision
If correction mechanisms are introduced to improve positioning accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the positioning process into distinct stages: obtaining integrated signal strength, obtaining first-path signal strength, calculating correction values, and applying corrections. This segmentation allows each component to be processed independently and systematically, making the complex correction mechanism more manageable and implementable without overwhelming 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
The method effectively reduces the influence of NLOS environments on positioning, improving the accuracy of UWB devices by correcting position information and navigation routes, and reducing deviations in radio communication ranging or positioning.
Implementation Method 1
wireless electromagnetic waves are easily affected by environmental factors... propagation speed of an electromagnetic wave signal in air is changed
Implementation Method 2
wireless signals are greatly attenuated or produces reflection, diffraction, etc.
Data Source
AI summary
A positioning method includes: obtaining an integrated signal strength and a first-path signal strength; obtaining an initial distance value between a sending device and a receiving device, and initial position information of the sending device; determining a correction distance value according to the integrated signal strength and the first-path signal strength, and correcting the initial distance value by using the correction distance value, to obtain a target distance value; and correcting the initial position information according to the target distance value, to obtain target position information.