Stationary Calibration Unit for UAV Compass Accuracy
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Solution Overview
Problem
Existing methods for calibrating a UAV compass are inadequate when the UAV is too large for manual or automated rotations, especially during transportation between geographical positions, leading to inaccurate measurements due to magnetic interference and varying Earth's magnetic field.
Innovation Solution
A stationary calibration unit is introduced, comprising a duplicate compass and actuator, which performs a calibration routine in the local Earth magnetic field, generating accurate calibration parameters that are transmitted to the UAV's flight controller, allowing for autonomous and accurate calibration without moving the UAV.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UAV is manually or automatically rotated through a sequence of movements for calibration, then the compass can be calibrated, but the UAV must be movable and not too large, which limits its applicability to large-scale UAVs
Solution Approach 1:
The patent creates a stationary calibration unit that contains a duplicate compass and flight controller. This copy allows the calibration process to be performed without moving the actual large UAV, thereby resolving the contradiction between achieving accurate compass calibration and maintaining applicability to large-scale UAVs that cannot be manually or automatically rotated.
2Adaptability or versatility
If the UAV is moved between geographical positions for calibration, then the compass can be calibrated in different locations, but magnetic interference and varying Earth's magnetic field cause inaccurate measurements
Solution Approach 1:
The stationary calibration unit acts as an intermediary device that performs calibration in a controlled environment. By using a duplicate compass and flight controller in a stationary unit rather than moving the actual UAV between geographical positions, the system eliminates the problem of magnetic interference and varying Earth's magnetic field while maintaining calibration location flexibility.
3Adaptability or versatility
If a stationary calibration unit with duplicate compass is used, then large UAVs can be calibrated without moving them, but the device complexity increases
Solution Approach 1:
The calibration system is segmented into a stationary calibration unit containing all necessary calibration components (duplicate compass, flight controller, actuator) and the actual UAV. This segmentation allows the complex calibration functionality to be separated from the UAV itself, making the calibration process applicable to stationary large UAVs while managing device complexity through modular design.
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 ensures precise and autonomous compass calibration of UAVs, even when they are too large for manual rotation, by using a stationary unit that mimics the UAV's movements, reducing errors and ensuring accurate navigation.
Implementation Method 1
calibrate the calibration compass relative to the local Earth magnetic field
Data Source
Figure 1a~1b
Figure 2
Figure 3~4
AI summary
A system (100) and corresponding method for calibrating a compass (109) of a flight controller (101) of an unmanned aerial vehicle (200) to local Earth magnetic field without moving said flight controller (101). The system (100) is configured to perform a calibration routine of a calibration compass (109), which is a duplicate of the compass of the flight controller (101), when the unmanned aerial vehicle (200) is parked in the vicinity of the system (100), record calibration parameters resulting from performing the calibration routine, and transmit the calibration parameters to the flight controller (101) of the unmanned aerial vehicle (200), preferably via a data link.