Intrusion Detection

NRL researchers have developed an intrusion detection system for undersea pipelines that detect intruding objects as well as leakage effects from the pipelines.

Bathymetry contours exhibiting 10x reduction in original size with 1% and 10m user specified thresholds.  Original data set shown (A), GRIN processed data (B). Grid Retaining Irregular Networks (GRIN): High Fidelity Geospatial Grid Data Compression

The US Naval Research Laboratory detachment at Stennis Space Center has developed GRIN, a fast, flexible, and highly efficient means of compressing geospatial datasets by thinning points while maintaining a high degree of accuracy for the remaining data points. GRIN is a new algorithm for calculating Right Triangulated Irregular Networks (RTINs) that preserves the positional integrity of the remaining original grid points. GRIN is designed for charting, navigation, and other high-precision applications.

Zero-Power Bathythermograph Sensors

The Zero Power Ballast Control (ZPBC) is a technology that relies on microbial energy harvesting developments to enable unsupervised underwater sensing with subsequent surfacing and reporting capabilities. With an ultimate goal of producing simple, small, power- efficient data harvesting nodes with varia-ble buoyancy, the device will be able to monitor ocean temperatures with a stay time ranging from weeks to months and eventually years, providing a longer term than other mechanisms such as the Expendable Bathythermograph (XBT).

The US Navy has developed and tested BOPPERS for the repeated unattended collection and reporting of environmental data from the entire water column from depths of 100m or less. BOPPERS: Autonomous Underwater Environmental Monitoring System

NRL has developed a shallow water environmental profiler the autonomously measures physical and optical properties of the water column at periodic, user-specified intervals over an extended time period (weeks to months). Data are collected and stored on-board, and can be transmitted in near-real-time to a land station when the profiler surfaces. The patent-pending NRL system, equipped with advanced instrumentation, includes the capability to simultaneously collect measurements of physical and bio-optical properties.

Subscribe to Oceanography