UAV Landing Control Using Altitude-Based Deviation Thresholds
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Solution Overview
Problem
Current UAV landing technologies face challenges in achieving precise landings due to environmental limitations such as wind and poor positioning accuracy, leading to increased landing failures.
Innovation Solution
A control method and device that determine a landing strategy for UAVs by comparing the fused horizontal deviation from multiple positioning sources with a preset threshold, considering current altitude, environmental conditions, and obstacles, allowing for real-time adjustments to ensure accurate alignment and safe landing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-position landing control is used, then the control system is simple, but landing precision deteriorates under environmental limitations such as wind
Solution Approach 1:
The patent divides the landing control into multiple phases (coarse landing and precise landing) with different control strategies. During coarse landing, the UAV flies to a position offset from the landing point by a predetermined distance. During precise landing, the UAV hovers at the offset position and then proceeds to the final landing point. This segmentation allows the system to achieve high landing precision without requiring complex real-time wind compensation throughout the entire descent.
Solution Approach 2:
The patent pre-calculates and sets an offset distance from the intended landing point based on environmental conditions (wind speed, UAV weight, blade diameter). This preliminary determination of the offset position allows the UAV to compensate for wind drift without requiring complex real-time adjustments during the final landing phase, thereby maintaining landing precision while avoiding excessive control system complexity.
2Measurement precision
If multiple positioning sources are fused to improve accuracy, then positioning precision improves, but system complexity increases
Solution Approach 1:
The patent introduces an offset position as an intermediary landing point between the UAV's current position and the final landing point. This intermediary position serves as a stable reference that reduces the impact of positioning errors and environmental disturbances. By using this intermediate hover point, the system achieves more accurate final positioning without requiring complex real-time fusion of multiple positioning sources throughout the entire landing process.
3Measurement precision
If real-time wind compensation is implemented, then landing precision improves, but control complexity and energy consumption increase
Solution Approach 1:
The patent pre-determines the offset distance based on environmental conditions and UAV parameters before the landing sequence begins. This preliminary action allows the system to compensate for expected wind drift without requiring continuous, energy-intensive real-time adjustments during the final approach and hover phases, thereby reducing overall energy consumption while maintaining landing precision.
Data Source
AI summary
A control method is provided, including: obtaining a current altitude of an aircraft, and determining a preset horizontal deviation threshold corresponding to the current altitude; obtaining a current horizontal deviation, wherein the current horizontal deviation is a horizontal deviation between a landing position and a current position of the aircraft; and determining a landing strategy of the aircraft based at least in part on a comparison between the current horizontal deviation and the preset horizontal deviation threshold.