Research on Conformal Design, Flow Field Simulation and Data Denoising Methods of Temperature, Salt and Depth Sensors for Portable Underwater Gliders

This study proposes a novel design for Conductivity-Temperature-Depth (CTD) sensor integration on portable underwater gliders to address conformal compatibility challenges, aiming to reduce hydrodynamic drag during glider motion and minimize turbulence interference during sensor measurements. Numerical simulations were employed to determine the optimal sensor placement and evaluate performance under varying angles of attack and sideslip. Additionally, post-processing techniques were applied to refine the acquired CTD data. The experimental results show that this design conforms to the overall streamlined shape. And through simulation, it was determined that the front of the portable underwater glider was the optimal installation position for the temperature, salinity and depth sensor. Compared with the rear installation, the turbulence intensity was reduced by approximately 30%-40%. The salinity spikes were eliminated by processing the data through the combination of median filtering with a window of 13 and moving smoothing filtering with a window of 7, and the maximum peak was optimized by approximately 0.1psu.