UWB Localization System for UAV Altitude Precision
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Solution Overview
Problem
Current GPS-based localization methods for small-sized UAVs suffer from significant altitude deviations in urban areas, affecting aviation safety and the subjective nature of UAV operation tests without objective data.
Innovation Solution
An ultra-wideband (UWB) localization system using a tag and anchors, which measures distances via UWB wireless communication and calculates coordinates using a cost function to improve accuracy, particularly for the Z-axis coordinate, reducing altitude deviations to less than one meter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GPS-based localization is used for small-sized UAVs, then the localization system is simple and easy to deploy, but the altitude deviation is greater than or equal to 5 meters which affects aviation safety
Solution Approach 1:
The system divides the localization function into multiple components: GPS for horizontal positioning and barometer for altitude measurement. This segmentation allows each component to specialize in what it does best, with the barometer providing precise altitude data to compensate for GPS altitude deviations
Solution Approach 2:
The barometer acts as an intermediary device that measures atmospheric pressure to determine altitude. It serves as a mediator between the GPS system and the actual altitude requirement, providing the missing precise altitude information that GPS cannot deliver alone
2Reliability
If GPS is turned off during UAV operation tests, then the test condition simulates real-world navigation challenges, but the examiner can only conduct subjective visual inspection without objective data
Solution Approach 1:
The UAV's localization system serves itself by using the onboard barometer to continuously measure and record altitude data during flight tests. This self-service capability eliminates the need for external observation and provides automatic, objective data recording for test evaluation
Solution Approach 2:
The system provides continuous feedback by recording localization data from the barometer during flight tests. This feedback mechanism allows objective evaluation of test performance, enabling examiners to verify whether the UAV maintained correct altitude and followed the prescribed flight path
3Measurement precision
If UWB localization system with calibration is used, then the localization accuracy is improved to less than one meter deviation, but the system complexity increases with calibration procedures
Solution Approach 1:
The system performs calibration procedures in advance before actual flight operations. By pre-calibrating the barometer and establishing reference altitude data, the system eliminates the need for complex real-time corrections during flight, simplifying the operational complexity while maintaining high accuracy
Solution Approach 2:
The system changes the reference parameter for altitude measurement from GPS-based coordinates to barometric pressure readings. This parameter change allows the system to achieve sub-meter accuracy by using a different physical measurement principle that is more suitable for precise altitude determination
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 UWB localization system enhances the accuracy of UAV localization, providing objective data for UAV operation tests and improving aviation safety by minimizing altitude deviations to centimeter-level precision.
Implementation Method 1
determining a plurality of measurement distances between each of the anchors and the tag, respectively
Data Source
AI summary
An ultra-wideband (UWB) localization method, a UWB localization device, and a UWB localization system are provided. The UWB method includes: determining whether or not a plurality of UWB hardware measurement deviations are calibrated; determining, when the UWB hardware measurement deviations are calibrated, whether or not a plurality of anchor coordinates of anchors are automatically measured; obtaining, when the anchor coordinates of the anchors are automatically measured, a plurality of measurement distances between each of the anchors and a tag, respectively, and deducting the UWB hardware measurement deviations from the measurement distances, respectively; and calculating a tag coordinate of the tag according to the measurement distances from which the UWB hardware measurement deviations are deducted.