Hierarchical Marker Detection for GPS-Independent UV Positioning
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Solution Overview
Problem
Unmanned vehicles face challenges in precise navigation and positioning due to unreliable GPS signals in urban areas and varying environmental conditions, and traditional visual markers are ineffective under these conditions.
Innovation Solution
A system and method using multi-level marker detection, where a camera on the UV captures and processes images of hierarchical markers with adaptive algorithms to detect and switch between autopilot modes for precise navigation, adjusting speed and orientation based on marker details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional visual markers are used for UV positioning, then the system is simple to implement, but the markers fail to be detected from long distances or at high speeds and struggle under varying light conditions
Solution Approach 1:
The marker is divided into multiple hierarchical levels with different sizes and features. Each level serves a specific detection range and purpose, allowing the system to detect markers effectively from both long distances and close ranges, resolving the contradiction between detection accuracy and marker simplicity
Solution Approach 2:
The patent transitions from traditional single-level 2D markers to multi-level hierarchical markers with nested structures. This dimensional expansion creates multiple detection layers that maintain visibility and detectability across varying distances, speeds, and lighting conditions while preserving operational simplicity
2Measurement precision
If GPS technology is used for broad location tracking, then the system provides good coverage, but it lacks the resolution to guide complex, precision-dependent operations
Solution Approach 1:
The navigation system is segmented into two complementary components: GPS for broad location tracking and multi-level marker detection for precision positioning. This segmentation allows each system to operate in its optimal range, with GPS providing coverage and markers providing high-resolution guidance for complex operations
Solution Approach 2:
The multi-level marker system acts as an intermediary between GPS and the UV's final positioning. It bridges the resolution gap by providing detailed local positioning information that complements GPS data, enabling precise operations in environments where GPS alone is insufficient
3Ease of operation
If traditional marker recognition methods are used, then the system is easy to operate, but they do not sufficiently accommodate rapid movements or changes in orientation
Solution Approach 1:
The marker detection system is designed to be dynamic and adaptive, automatically adjusting to rapid movements and orientation changes. The hierarchical structure provides multiple reference points that remain detectable during dynamic operations, maintaining both ease of operation and detection reliability
Solution Approach 2:
The system changes detection parameters based on operational conditions. By utilizing multiple marker levels with different sizes and features, the system automatically adapts to varying distances, speeds, and orientations, maintaining reliable detection without requiring complex manual adjustments
Data Source
AI summary
Advanced control systems and methods for precise navigation and positioning of unmanned vehicles (UVs) without reliance on GPS. A hierarchical marker including nested geometric shapes with distinct visual features, detectable by a camera mounted on the UV is utilized. An image processing unit processes the captured images, identifying marker levels to guide the UV through multiple stages of approach. An integrated UV controller, including an autopilot module, dynamically switches between autopilot modes corresponding to each detected marker level, ensuring precise alignment and positioning.