UAV Positioning Using Magnetic and GPS Directional Data
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) face challenges in maintaining a fixed position due to wind-induced drift, making it difficult to accurately determine the directional correction needed to return to a desired position, as existing methods lack consideration for the UAV's orientation.
Innovation Solution
A two-stage directional information process is employed, where an initial magnetic directional information is used to initiate corrective motion, followed by a more accurate GPS-derived directional information obtained from the UAV's change in position, allowing for precise alignment with the desired position, with optional recalculations and threshold-based adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic directional information is used to initiate corrective motion, then the UAV can start moving toward the desired position, but the directional accuracy is insufficient to hit the desired position exactly
Solution Approach 1:
The directional information acquisition is divided into two segments: magnetic directional information for initiating corrective motion, and GPS-derived directional information for precise alignment. This segmentation allows the system to use different information sources for different stages of the positioning process, achieving both rapid response and high accuracy.
Solution Approach 2:
Magnetic directional information is used to perform preliminary corrective motion before GPS-derived directional information becomes available. This preliminary action gets the UAV moving in the rough direction of the desired position, after which more accurate directional information refines the approach.
2Measurement precision
If GPS-derived directional information is used from the beginning, then high directional accuracy can be achieved, but the system cannot respond quickly when the UAV is stationary or moving very slowly
Solution Approach 1:
The system dynamically switches between different directional information sources based on the UAV's motion state. When the UAV is stationary or moving slowly, magnetic directional information is used for immediate response. When the UAV is moving sufficiently, GPS-derived directional information is used for high accuracy. This dynamic adaptation optimizes both response speed and accuracy.
Solution Approach 2:
Magnetic directional information serves as an intermediary that bridges the gap between stationary conditions and GPS-based navigation. It provides immediate directional guidance when GPS-derived information is unavailable or insufficient, enabling the system to respond quickly while maintaining the ability to achieve high accuracy when conditions permit.
3Measurement precision
If the UAV continuously adjusts its position based on high-accuracy directional information, then precise positioning can be achieved, but the complexity of the control system increases
Solution Approach 1:
The system uses GPS-derived directional information partially, only after the UAV has moved sufficiently from its initial position. This partial application of high-accuracy information avoids the complexity of continuously processing and adjusting based on GPS data from the start, while still achieving precise positioning when needed.
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 method enables UAVs to accurately and reliably move from an actual to a desired position by iteratively correcting the initial directional information with higher accuracy data, compensating for wind and sensor noise, ensuring precise positioning.
Implementation Method 1
It is possible to consider the signal propagation time between the unmanned aerial vehicle and the respective satellite in order to obtain the position information for the unmanned aerial vehicle.
Implementation Method 2
The first piece of directional information may be a magnetically obtained piece of directional information. A magnetically obtained piece of directional information denotes particularly a piece of directional information derived from the earth's magnetic field.
Data Source
AI summary
The invention relates to a method for positioning an unmanned aerial vehicle, in which the actual position (25) of the aerial vehicle differs from a desired position (26) and in which the aerial vehicle is set in a corrective motion in the direction of the desired position (26) on the basis of a first piece of directional information (27). After the beginning of the corrective motion a second piece of directional information (28) is obtained. The first piece of directional information (27) is corrected on the basis of the second piece of directional information (28). The invention moreover relates to an aerial vehicle suitable for performing the method. The invention allows a specific corrective motion in the direction of the desired position.