Robotic paradigms

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In robotics, a robotic paradigm is a mental model of how a robot operates. A robotic paradigm can be described by the relationship between the three primitives of robotics: Sense Plan Act. It can also be described by how sensory data is processed and distributed through the system, and where decisions are made.

Hierarchical/deliberative paradigm

  • The robot operates in a top-down fashion, heavy on planning.
  • The robot senses the world, plans the next action, acts; at each step the robot explicitly plans the next move.
  • All the sensing data tends to be gathered into one global world model.
Hierarchical Paradigm schema

The reactive paradigm

  • Sense-act type of organization.
  • The robot has multiple instances of Sense-Act couplings.
  • These couplings are concurrent processes, called behaviours, which take the local sensing data and compute the best action to take independently of what the other processes are doing.
  • The robot will do a combination of behaviours.
Reactive Paradigm schema

Hybrid deliberate/reactive paradigm

  • The robot first plans (deliberates) how to best decompose a task into subtasks (also called “mission planning”) and then what are the suitable behaviours to accomplish each subtask.
  • Then the behaviours starts executing as per the Reactive Paradigm.
  • Sensing organization is also a mixture of Hierarchical and Reactive styles; sensor data gets routed to each behaviour that needs that sensor, but is also available to the planner for construction of a task-oriented global world model.
Hybrid Deliberate/Reactive Paradigm schema

See also