UAV Obstacle Avoidance Altitude Control for Complex Terrain
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Solution Overview
Problem
Agricultural plant protection UAVs face challenges in navigating complex terrains like hills and slopes due to obstacles detected by their radar, which can lead to abnormal operation if the ground is used as an obstacle for avoidance, causing potential issues with high hills or slopes.
Innovation Solution
An obstacle-avoidance control method for UAVs that acquires the distance between the UAV and a front object and adjusts the flying altitude accordingly, using a flight controller with processors to control the UAV's altitude and trajectory to maintain safety distances, employing sensors like radar, ultrasonic, TOF, or visual sensors for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar is used to detect obstacles in front of the UAV, then obstacle avoidance capability is improved, but false detection of ground as obstacle occurs in complex terrain
Solution Approach 1:
The patent applies local quality by differentiating between ground surfaces and actual obstacles based on their spatial and temporal characteristics. The flight controller analyzes the position, altitude, and movement patterns of detected objects to determine whether they are ground features or true obstacles, allowing the radar to maintain high sensitivity while reducing false detections in complex terrain.
Solution Approach 2:
The system dynamically adjusts obstacle avoidance behavior based on real-time terrain analysis. When ground features are detected, the flight controller adapts the avoidance threshold and response characteristics, enabling the UAV to navigate complex terrain safely while maintaining reliable obstacle detection capability.
2Object-affected harmful factors
If the UAV stops flying forward when ground is detected as obstacle, then collision avoidance is improved, but normal operation in hills and slopes is disrupted
Solution Approach 1:
The flight controller applies local quality by implementing spatially differentiated control responses. When ground features are detected in specific locations (such as hills or slopes), the system adjusts its avoidance behavior locally rather than applying a global stop command, allowing normal operation to continue in areas where ground detection is expected.
Solution Approach 2:
The system dynamically adjusts flight control based on real-time terrain classification. When the radar detects ground features, the flight controller dynamically modifies avoidance thresholds and flight path adjustments, enabling the UAV to maintain normal operation in complex terrain while still providing collision avoidance when genuine obstacles are present.
3Stability of the object's composition
If the UAV maintains constant altitude, then flight stability is improved, but inability to adapt to terrain variations occurs
Solution Approach 1:
The patent implements dynamic altitude control that adapts to terrain variations while maintaining flight stability. The flight controller continuously monitors radar detections and adjusts altitude in real-time based on detected ground features and obstacles, allowing the UAV to navigate hills, slopes, and terraces smoothly without abrupt altitude changes that would compromise stability.
Solution Approach 2:
The system employs feedback control where the flight controller continuously receives radar data about ground features and obstacles, processes this information, and adjusts altitude accordingly. This closed-loop control maintains flight stability by making smooth, incremental altitude adjustments rather than abrupt changes, while simultaneously adapting to terrain variations.
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
Ensures normal operation of agricultural UAVs by increasing altitude and adjusting flight trajectories to avoid obstacles, preventing collisions and ensuring safety, especially in environments with hills, slopes, and terraces.
Implementation Method 1
an unmanned aerial vehicles (UAV) is often equipped with a radar
Data Source
AI summary
An obstacle-avoidance control method comprises acquiring a distance between an unmanned aerial vehicle (UAV) and a front object in a flying direction of the UAV; and controlling a flying altitude of the UAV according to the distance between the UAV and the front object.