Automatic navigation systems for AGVs

Automated Guided Vehicles (AGVs) are now at the heart of digital transformation in warehouses, manufacturing, and internal logistics. To achieve best performance, automatic navigation technology for AGVs must be reliable, accurate, and suited to the specific requirements of the plant.

This article compares main navigation technologies, explaining how they work, to clarify what to consider when designing or upgrading an AGV system.

Why is navigation central to AGV systems?

An AGV is an automatic vehicle which must always know its position and attitude in the plant space, it must rule motion axes to make maneuvers, and do so safely in environments shared with people, machinery, obstacles, and other vehicles. Navigation is therefore the core component that enables the vehicle to localize itself, go through predefined roads stored in the map, and follow the path generated by the fleet management system.

Which are main navigation systems for AGVs?

AGV navigation systems can be classified into several families, each with advantages, limitations, and suitability considerations. Every facility has unique characteristics in terms of space, traffic, layout variability, and required precision: the choice of navigation technology must take these factors into account.

Inertial and magnetic navigation

One of the most widespread solutions for complex industrial environments is inertial guidance with magnetic references. In this approach, the AGV uses odometry to estimate speed, position, and orientation while moving through the layout, continuously correcting this estimation by comparing it with a gyroscope and external references placed on the floor surface.

These references consist of small cylindrical magnets installed on strategic points along the routes. The onboard magnetic sensor detects their magnetic fields, allowing the motion controller to correct the estimated position, often achieving sub-millimeter accuracy.

Inertial and magnetic navigation is valued for:

• its precision and repeatability.
• the robustness of the system which can operate even on rough terrain, in dusty, dark or very bright environments (where optical sensors may struggle) and in presence of other electromagnetic sources.
• The low impact during installation, requiring only to drill and place some magnets on the ground.

Laser navigation based on triangulation

Another widely adopted technology is laser navigation using triangulation on reflectors installed in the working area. In this method, a 2D laser sensor emits pulses that hit reflector mirrors placed on walls or fixed structures. The return time and reflection angles are used to calculate the AGV’s precise geometric position

Navigation laser:

• provides high accuracy.
• offers flexibility in route layout.
• allows paths to be adjusted or redesigned without major floor interventions.
• requires proper installation of reflectors and may involve higher initial design and maintenance costs compared to other methods.

Natural navigation (SLAM and environmental perception)

In recent years, natural navigation has become increasingly widespread, often based on SLAM algorithms (Simultaneous Localization And Mapping). With this method, the vehicle dynamically builds a map of the environment and localizes itself within it using sensors such as LiDAR or cameras

The key advantage of SLAM is that it does not require any reference device in the plant: the AGV recognizes natural environmental features (walls, columns, shelves, etc.) to orient itself. This makes it suitable for highly dynamic environments where layouts change frequently, and physical infrastructure modifications are impractical.

However, SLAM requires more complex data processing and is often associated with AGVs that have higher computational power or advanced sensor systems.

GPS navigation with RTK technology

GPS navigation represents the ideal solution for AGVs intended for fully outdoor applications, ensuring reliable and continuous positioning even in large and complex environments. Thanks to RTK corrections, the system achieves high centimetric accuracy, enabling precise and repeatable movements thanks to a small, fixed station and without any other reference point around the plant

Designed for operation in large open areas, this technology is particularly suitable for agriculture, logistics yards, and outdoor industrial sites.

There is no single “best” solution: the choice depends on the operating context, system constraints, and required levels of precision.

Integration with software and motion control

Beyond the chosen navigation technology, an effective AGV system integrates sensors, motion controllers, and management software. The onboard controller must aggregate sensor data, estimate real-time position and orientation, and translate this information into traction and steering commands. In parallel, fleet management software coordinates multiple vehicles, defines missions, and monitors overall operational status.

Solutions such as graphical mapping systems, path simulation, and centralized vehicle management simplify configuration and control of AGV operations, reducing commissioning time and minimizing operational errors.

Integrated and coherent processing between sensors, control systems, and software is a fundamental component for achieving reliable, safe, and easily maintainable AGV systems.

CAD tools for AGV simulation and optimization

Simulation and CAD modeling tools are essential to reduce risk and increase efficiency before physical implementation. These tools allow engineers to accurately model the plant layout, define vehicle paths, simulate movements, and identify potential issues related to space constraints, traffic, and mission timing. This enables overall system performance optimization, improved operational safety, and reduced commissioning time and costs

This category includes tools such as RAT (Robox AGV Tool), which are used to draw the plant map and support engineers in defining and virtually validating navigation logic, making the design process more precise, predictive, and scalable.

Functional safety in AGV systems

Navigation is not only about position and path: in industrial environments, functional safety is critical. Safe systems integrate safety scanners, proximity sensors, and dedicated programmable controllers to continuously monitor operational areas and protect people, loads, and infrastructure.

These solutions must be scalable and adaptable to different vehicle fleets while ensuring compliance with industry safety standards, without negatively impacting operational efficiency. The use of dedicated safety PLCs, combined with advanced calculation libraries, enables dynamic adjustment of sensor monitoring zones based on AGV operating conditions.

How to choose the right AGV navigation system for an industrial warehouse

When evaluating an automatic navigation system for AGVs, several key criteria should be considered:

• Required localization accuracy for the production process.
• Layout flexibility and frequency of changes.
• Available infrastructure (e.g., possibility of installing magnets or reflectors).
• Functional safety requirements and control system integration.
• Solution scalability for future expansion.

The choice of navigation technology must always be contextualized to operational needs, plant configuration, and the long-term strategy for automation and maintenance.

There is no absolutely better technology, but the right one for your application does exist.
We help you identify it, integrating navigation and control efficiently and scalably.