A high-precision underwater digital elevation model (DEM) is the premise of terrain-aided navigation.
A few more minutes and the skies were alive with crackling energy as blue-footed boobies dive-bombed for fish from 50 m, disappearing into the turquoise sea with pinpoint precision before emerging seconds later like underwater missiles bursting through the air.
This paper focuses on high-precision diving and leveling control of an underwater tension leg platform, which uses hydraulic winches as the actuation mechanism.
"If they infringe on the DPRK's sovereignty and dignity even a bit, its army will launch merciless ultra-precision strikes from ground, air, sea, and underwater," the North's state news agency KCNA said.
While current method only processes underwater nodes individually, which causes the localization precision for each nodes varying severely.
The requirement for high accuracy in dynamic positioning of remotely operated vehicles (ROV), especially when tasks close to underwater structures have to be performed, demands high precision of sensor systems.
In addition, even for species for which other visually based methods are feasible, passive acoustic methods offer the potential for greater detection ranges in some environments (e.g. underwater or in dense forest), and hence potentially better precision.
There's been a shift from broad attacks to precision, surgical attacks thanks to the help of UAVs, UGVs, and recently, UUVs (unmanned underwater vehicles.
Simulation and experimental results show that the controllers designed in this paper can achieve speed control and displacement control with high precision and strong adaptability, thus leading to successful diving and leveling control of the underwater tension leg platform.
A line impact was used as a base to perform preliminary tests of the precision impact test system, and the distributed impact configuration was necessary to generate a response similar to an underwater blast wave loading.
