Application Domains – Aerial, Ground, and Marine Vehicle Architectures

Autonomous systems operate across diverse environments that impose unique constraints on perception, communication, control, and safety. While all share a foundation in modular, layered architectures, the operational domain strongly influences how these layers are implemented ^[1,2]. Some of the most important challenges and differences are listed in the following table:

Aerial autonomous systems include Unmanned Aerial Vehicles (UAVs), drones, and autonomous aircraft. Their software architectures must ensure flight stability, real-time control, and safety compliance while supporting mission-level autonomy ^[3]. UAV architectures are often tightly coupled with flight control hardware, leading to a split architecture:

1. Onboard system (real-time control and perception)
2. Ground control system (mission management, supervision)

Some of the most popular architectures:

PX4 Autopilot An open-source flight control stack supporting multirotors, fixed-wing, and VTOL aircraft. The PX4 architecture is divided into Flight Stack (estimation, control) and Middleware Layer (uORB) for data communication ^[4]). The technical implementation of the architecture ensures compatibility with MAVLink communication and ROS 2 integration, making it a very popular and widely used solution.

ArduPilot In comparison, the ArduPilot is a Modular architecture with layers for HAL (Hardware Abstraction Layer), Vehicle-Specific Code, and Mission Control. The technical implementation are widely used by the community and used in research and commercial UAVs for mapping, surveillance, and logistics ^[5].

Still, some challenges remain:

• Safety and Redundancy: Flight-critical functions must survive component failures.
• Communication Constraints: Limited bandwidth and intermittent connectivity.
• Energy Efficiency: Trade-offs between payload weight and computational power.
• Airspace Regulation: Compliance with UAV Traffic Management (UTM) systems ^[6].

Ground autonomous systems encompass self-driving cars, unmanned ground vehicles (UGVs), and delivery robots. Their architectures must manage complex interactions with dynamic environments, multi-sensor fusion, and strict safety requirements ^[7]. A ground vehicle’s software stack integrates high-level decision-making with low-level vehicle dynamics, ensuring compliance with ISO 26262 functional safety standards ^[8]. One of the reference architectures used is Autoware.AI (and its successor Autoware.Auto), which is an open-source reference architecture for autonomous driving built on ROS/ROS 2. It implements all functional modules required for L4 autonomy, including:

• Perception (object recognition, segmentation)
• Planning (route, behaviour, trajectory)
• Control (PID, MPC)
• Simulation and visualisation tools

Autoware emphasises modularity, allowing integration with hardware-in-the-loop (HIL) simulators and real vehicle platforms ^[9]). Currently, the automotive industry is using several standards to foster the development and practical implementations of future autonomous ground transport systems:

• AUTOSAR Adaptive Platform: Provides safety-certified, service-oriented design.
• ISO 26262: Functional safety standard ensuring risk assessment and hazard analysis.
• SAE J3016: Defines levels of driving automation (0–5).
• OpenDrive / OpenScenario: Data models for simulation and testing.

Due to the environmental complexity, in the autonomous ground vehicles domain, the following main challenges still remain:

• Sensor Fusion Complexity: Handling heterogeneous sensor data in urban environments.
• Uncertainty and Prediction: Managing unpredictable behaviours of pedestrians and other vehicles.
• Computation Load: Real-time inference on limited onboard computing resources.
• V2X Communication: Integration with smart infrastructure and other vehicles.

Marine autonomous vehicles operate in harsh, unpredictable environments characterised by communication latency, limited GPS access, and energy constraints. They include AUVs (Autonomous Underwater Vehicles), ASVs (Autonomous Surface Vehicles) and ROVs (Remotely Operated Vehicles). These vehicles rely heavily on acoustic communication and inertial navigation, requiring architectures that can operate autonomously for long durations without human intervention ^[10].