For the last decade, scientists have deployed increasingly capable underwater robots to map and monitor pockets of the ocean to track the health of fisheries, and survey marine habitats and species. In general, such robots are effective at carrying out low-level tasks, specifically assigned to them by human engineers — a tedious and time-consuming process for the engineers.
When deploying autonomous underwater vehicles (AUVs), much of an engineer’s time is spent writing scripts, or low-level commands, in order to direct a robot to carry out a mission plan. For example, an engineer may give a robot a list of goal locations to explore, along with any time constraints, as well as physical directions, such as staying a certain distance above the seafloor.
During last year MIT researchers build underwater robot for port security. Now a new programming approach developed by MIT engineers gives robots more “cognitive” capabilities, enabling humans to specify high-level goals, while a robot performs high-level decision-making to figure out how to achieve these goals. Using the system devised by the MIT team, the robot can then plan out a mission, choosing which locations to explore, in what order, within a given timeframe. If an unforeseen event prevents the robot from completing a task, it can choose to drop that task, or reconfigure the hardware to recover from a failure, on the fly.
These vehicles could plan their own missions, and execute, adapt, and re-plan them alone, without human support. It could safely zigzag all the way around the reef, like an obstacle course. Researchers tested their system on an autonomous underwater glider, and demonstrated that the robot was able to operate safely among a number of other autonomous vehicles, while receiving higher-level commands. The glider, using the system, was able to adapt its mission plan to avoid getting in the way of other vehicles, while still achieving its most important scientific objectives. If another vehicle was taking longer than expected to explore a particular area, the glider, using the MIT system, would reshuffle its priorities, and choose to stay in its current location longer, in order to avoid potential collisions. This system is very useful in ocean engineering and security purpose.
