An intelligent control strategy is proposed to eliminate the actuator saturation problem that exists in the trajectory tracking process of unmanned underwater vehicles (UUV). The control strategy consists of two parts: for the kinematic modeling part, a fuzzy logic-refined backstepping control is developed to achieve control velocities within acceptable ranges and errors of small fluctuations; on the basis of the velocities deducted by the improved kinematic control, the sliding mode control (SMC) is introduced in the dynamic modeling to obtain corresponding torques and forces that should be applied to the vehicle body. With the control velocities computed by the kinematic model and applied forces derived by the dynamic model, the robustness and accuracy of the UUV trajectory without actuator saturation can be achieved.

April 2016, Sea Hunter was launched by the American Navy mentored by DARPA (Defence Advance Research Project Agency) a 40-meter unmanned and completely autonomous warship designed for the anti-submarine warfare. The entire manoeuvre and navigation of Sea Hunter was controlled by the artificial intelligence with zero-crew size onboard. After five years in April 2021 another technological miracle was designed by the MSubs for the British Naval Power. It was debuted as UUVs (Unmanned Underwater Vehicles), which is the exclusive research prototype for XLUUV (Extra Large Unmanned Underwater Vehicle). The fabrication motivation is to control XLUUV up to 3000 miles from the command centre for three-month duration.

The US military is equipped with a number of stealthy underwater robots to spy on enemies, but these high-tech innovations come years after Charlie the robotic catfish. Developed in the 1990s by the Central Intelligence Agency (CIA), this unmanned underwater vehicle is operated remotely using a line-of-sight audio and fitted with sensors to spy on adversaries, along with collecting water samples. The'catfish' is also designed with a pressure hull, ballast system and communication system in the main part of its body and propulsion system in the tail. Details of Charlie's missions are still classified, but the technology led engineers to design robotic submarines and other aquatic inspired machines to investigate the seas. The robotic fish measures about two feet long and some of its specifications, according to the CIA website, include speed, endurance, depth control and navigational accuracy.

China is developing large, smart and relatively low-cost unmanned submarines that can roam the world's oceans to perform a wide range of missions, from reconnaissance to mine placement to even suicide attacks against enemy vessels, according to scientists involved in these artificial intelligence (AI) projects. The autonomous robotic submarines are expected to be deployed in the early 2020s. While not intended to entirely replace human-operated submarines, they will challenge the advantageous position established by Western naval powers after the second world war. The robotic subs are aimed particularly at the United States forces in strategic waters like the South China Sea and western Pacific Ocean, the researchers said. The project is part of the government's ambitious plan to boost the country's naval power with AI technology.

Robot Wars will soon back on TV in the UK, and a very similar battle is heading for the country's seas. The British Royal Navy will be holding a demonstration of unmanned technology off the coast of Scotland this autumn. And during the event, one company will be trialling the world's first unmanned aerial vehicle (UAV) capable of landing autonomously on a moving ship. The British Royal Navy will be holding a demonstration of unmanned technology off the coast of Scotland this autumn. One company, Roke, will be trialling the world's first unmanned aerial vehicle (UAV) capable of landing autonomously on a moving ship (test phases pictured) The machines will compete in their very own version of'robot wars' to demonstrate they could be part of the Navy's future.

Robot Wars will soon back on TV in the UK, and a very similar battle is heading for the country's seas. The British Royal Navy will be holding a demonstration of unmanned technology off the coast of Scotland this autumn. The machines will compete in their very own version of'robot wars' to demonstrate they could be part of the Navy's future. The Royal Navy will be holding a demonstration of unmanned technology off the coast of Scotland this autumn. The'Unmanned Warior 2016' will feature vehicles that fly along with those that move across the surface, or under water.