AGVHub
How Does AGV Navigation Work?
Overview of navigation technologies for AGVs: Laser navigation, contour navigation, magnetic tape, SLAM, and more compared.
Basic Navigation Principle
Navigation is the heart of every AGV. It answers two fundamental questions:
- Where am I? (Localization)
- How do I get to the destination? (Path planning)
Different technologies answer these questions in different ways.
Navigation Technologies Overview
1. Contour Navigation (SLAM)
How it works
The AGV creates a map of the environment and localizes itself using natural contours (walls, racks, columns).
Advantages
- No additional infrastructure
- Quick deployment
- Flexible route changes
Disadvantages
- Stable environment required
- Large open areas problematic
- Computationally intensive
2. Reflector Navigation (Laser Navigation)
How it works
A rotating laser scanner detects reflectors on walls or columns and calculates position via triangulation.
Advantages
- High precision (±10mm)
- Flexibly expandable
- Proven technology
Disadvantages
- Reflectors must be installed
- Line of sight required
- Higher costs
3. Magnetic Tape / Induction Navigation
How it works
The AGV follows a magnetic tape embedded in or applied to the floor.
Advantages
- Low acquisition cost
- Simple technology
- Reliable
Disadvantages
- Inflexible for layout changes
- Tape can be damaged
- Visible infrastructure
4. Other Technologies
| Technology | Principle | Use Case |
|---|---|---|
| Floor marking | Optical line detection | Simple applications |
| QR Code / Grid | Camera reads floor codes | Warehouses, small-parts AMR |
| GPS / UWB | Radio-based positioning | Outdoor, large halls |
| Camera + AI | Visual recognition | Dynamic environments |
Which Navigation for Which Use Case?
| Requirement | Recommended Navigation |
|---|---|
| Fixed routes, low budget | Magnetic tape |
| High precision, stable environment | Reflector navigation |
| Flexible routes, minimal infrastructure | Contour navigation (SLAM) |
| Outdoor | GPS + Odometry |
| Highly dynamic, collaborative | Camera + AI + SLAM |
Combining Technologies
Modern AGVs often combine multiple navigation methods:
- Coarse navigation via SLAM or reflectors
- Fine positioning via camera or floor markers
- Safety via 360° laser scanners
This fusion increases reliability and precision.
Conclusion
The choice of navigation significantly impacts cost, flexibility, and reliability of your AGV system. Carefully analyze your environment and requirements before making a decision.