USA As Represented by Secretary of the Navy

Matthew Joseph Nicholson

David Bartholomew Chadwick

Jonathon Keith Oiler

Gregory Knowles Fleizach

Heidi L Buck

Barry R Hunt

Brian T Williams

Matthew Fong

Alan Fronk

Peter C Grossnickle

Richard W White

Willis L Frisch

Richard L Allman

James E Straus

A drifting particle simulator buoy system for a stormwater discharge plume which includes a GPS unit for tracking the buoy GPS location at the surface of the plume and a drogue/winch unit including a drogue chute and winch package which is lowered to the seafloor at a controlled descent rate which is comparable to the descent rate of certain size sediment particles of interest within the stormwater discharge plume. The drogue chute controls lateral drift with the underwater current at approximately the same velocity of the sediment particles of interest. A control unit controls the drogue/winch unit, including controlling the speed of the chute/winch unit to mimic the settling rate of the sediment particles of interest. A bottom detection sensor determines the GPS location where the chute/winch package reaches the seafloor and determining the depositional footprint of contamination at the determined GPS location.

Drifting particle simulator for tracking contaminated sediment from stormwater discharge plumes

A drifting buoy sampler system for a stormwater discharge plume formed from stormwater discharged into coastal waters. The system compresan electronics sampling pod for collecting integrated water samples within the stormwater plume as the buoy system drifts with the stormwater plume near the water surface as the plume travels out to sea. The pod includes a watertight section including a GPS/radio module for providing GPS (geo-position) location information and a processor for monitoring and controlling the sampling rate, a pump module and a battery module; a passive sampler bag for collecting the integrated water samples; a free flooding section including a composite sample bag module such that the pump module pumps collected samples from the passive sampler bag to the composite sample bag module at a predetermined sampling rate and a ballast module for providing ballast to the system when drifting within the plume.

Drifting exposure system for sampling stormwater discharge plumes

A system and process for the geo-location of an asset given no a priori knowledge regarding time and location of the asset with minimized power consumption is disclosed. In the preferred embodiment, the system is accurate to about 30 meters CEP (50% circular error probable) using just a short segment, e.g., 100-200 ms, of digitized GPS L1 signal data.

System and method for geo-locating a receiver with reduced power consumption

A system and method for estimating a ship's far-field acoustic characteristics includes at least one reference hydrophone and at least one movable hydrophone, both of which are disposed in the water closely adjacent the ship. The movable hydrophone senses acoustic tonals at a plurality of points on the surface of an imaginary prolate spheroid surrounding the ship, the major and minor axes of which are roughly equal to one-half the length of the ship and the beam of the ship, respectively. The phase difference in the signals from the movable hydrophone and reference hydrophone are compared to generate a near-field data set. A computer is used to estimate a far-field data set representative of the ship's acoustic characteristics based on the near-field data set. Thus actual far-field measurements are not required.

System for estimating far-field acoustic tonals

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San Diego, CA, United States of America

Matthew Joseph Nicholson