| Supplemental Student Support: Detection and Identification of Buried Targets using Time Reversal Acoustics |
04-Nov-2009 |
283 pages |
| Authors:
Zachary J Walters; Ronald A Roy; BOSTON UNIV MA
|
 | The presence of noise and coherent returns from clutter often confounds efforts to acoustically detect and identify target objects buried in inhomogeneous media. Using iterative time reversal with a single channel transducer, returns from resonant targets are enhanced, yielding convergence to a narrowband waveform characteristic of the dominant mode in a target's elastic scattering response. The procedure consists of exciting the target with a broadband acoustic pulse, sampling the return ... |
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| Multi-Static Detection and Localization of Buried Targets using Synthetic Aperture Iterative Time-Reversal Processing |
18-Mar-2009 |
26 pages |
| Authors:
H C Song; Karim Sabra; W A Kuperman; W S Hodgkiss; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
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| The objective of this project is to develop bi-static applications of the iterative time reversal techniques to focus along the ocean bottom. Iterative time-reversal provides a simple solution for self-adaptive focusing on strong reflectors (i.e. scattering targets) located on the ocean bottom without relying on predictive or modeling capabilities of the environment and of the target of interest. These robust focusing properties are crucial for mapping large and uncharted areas ... |
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| Non-traditional Physics-based Inverse Approaches for Determining a Buried Object's Location |
Sep-2008 |
99 pages |
| Authors:
Fridon Shubitidze; THAYER SCHOOL OF ENGINEERING HANOVER NH
|
| The research described in this report was conducted in fulfillment of Project MM-1592, Non-traditional physics-based inverse approaches for determining a buried object's location submitted to the Strategic Environmental Research and Development Program's (SERDP) Exploratory Development Program (SEED) in response to Statement of Need MMSEED-07-02, Advanced Technologies for Detection, Discrimination, and Remediation of Munitions and Explosives of Concern (MEC): UXO Technology. The main focus of this research was to explore and ... |
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| Evanescent Acoustic Wave Scattering by Targets and Diffraction by Ripples Graduate Traineeship Award in Ocean Acoustics |
AUG 2007 |
9 pages |
| Authors:
Curtis F. Osterhoudt; Philip L. Marston; WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS
|
| This grant was a "Graduate Trainee ship Award" in Ocean Acoustics for the support of Curtis F. Osterhoudt. The purpose of his research was to improve the understanding of the way that acoustic evanescent waves interact with targets buried in sediments in situations encountered in underwater acoustics. A method was developed and tested for the stable laboratory production of acoustic evanescent waves in water based on the reflection of a ... |
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| Novel Methods for Detecting Buried Explosive Devices |
10 APR 2007 |
15 pages |
| Authors:
Stephen W. Kercel; Robert S. Burlage; David R. Patek; Cyrus M. Smith; A. D. Hibbs; T. J. Rayner; OAK RIDGE NATIONAL LAB TN
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| Oak Ridge National Laboratory (ORNL) and Quantum Magnetics, Inc. (QM) are exploring novel landmine detection technologies. Technologies considered here include bioreporter bacteria, swept acoustic resonance, nuclear quadrupole resonance (NQR), and semiotic data fusion. Bioreporter bacteria look promising for third-world humanitarian applications; they are inexpensive, and deployment does not require high-tech methods. Swept acoustic resonance may be a useful adjunct to magnetometers in humanitarian demining. For military demining, NQR is a ... |
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| Multibeam Observations of Mine Burial Near Clearwater, FL, Including Comparisons to Predictions of Wave-Induced Burial |
Jan-2007 |
17 pages |
| Authors:
Michael D Richardson; Monica L Wolfson; David F Naar; Peter A Howd; Stanley D Locker; Brian T Donahue; Carl T Friedrichs; Arthur C Trembanis; Thomas F Wever; UNIVERSITY OF SOUTH FLORIDA SAINT PETERSBURG
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| A Kongsberg Simrad EM 3000 multibeam sonar (Kongsberg Simrad, Kongsberg, Norway) was used to conduct a set of six repeat high-resolution bathymetric surveys west of Indian Rocks Beach (IRB), just to the south of Clearwater, FL, between January and March 2003, to observe in situ scour and burial of instrumented inert mines and mine-like cylinders. Three closely located study sites were chosen: two fine-sand sites, a shallow one located in ... |
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| Mine Burial Experiments at the Martha's Vineyard Coastal Observatory |
Jan-2007 |
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| Authors:
Peter Traykovski; Michael D Richardson; Larry A Mayer; James D Irish; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
 | Several experiments to measure post impact burial of seafloor mines by scour and fill have been conducted near the Woods Hole Oceanographic Institution's Martha's Vineyard Coastal Observatory (MVCO, Edgartown, MA). The sedimentary environment at MVCO consists of a series of rippled scour depressions (RSDs), which are large scale bedforms with alternating areas of coarse and fine sand. This allows simultaneous mine burial experiments in both coarse and fine sand under ... |
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| Measured and Predicted Burial of Cylinders During the Indian Rocks Beach Experiment |
Jan-2007 |
13 pages |
| Authors:
Grant R Bower; Thomas F Wever; Sean Griffin; John Bradley; Edward F III; Braithwaite; Paul A Elmore; Kevin B Briggs; Michael D Richardson; Ralf Luhder; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
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| Burial of instrumented mine-like cylinders as a result of wave-induced scour was measured during experiments conducted in shallow water (15-16 m) with fine-sand (133-um) and coarse-sand (566-um) sediments off Indian Rocks Beach (IRB), FL. Scour pits developed around the instrumented cylinders in the fine-sand site when significant wave heights exceeded 2 m, causing the cylinders to pitch, then roll into the developing scour pits, often changing heading to align parallel ... |
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| Scour and Burial Mechanics of Objects in the Nearshore |
Jan-2007 |
14 pages |
| Authors:
Scott A Jenkins; Douglas L Inman; Michael D Richardson; Thomas F Wever; Joseph Wasyl; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL LAB
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| A process-based, numerical, hydrodynamic vortex lattice mine scour/burial model (VORTEX) is presented that simulates scour and burial of objects of arbitrary shape resting on a granular bed in the nearshore. There are two domains in the model formulation: a far-field where burial and exposure occur due to changes in the elevation of the seabed and a near-field involving scour and transport of sediment by the vortices shed from the object. ... |
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| High-Resolution Mapping of Mines and Ripples at the Martha's Vineyard Coastal Observatory |
Jan-2007 |
18 pages |
| Authors:
Larry A Mayer; Richard Raymond; Gerd Glang; Michael D Richardson; Peter Traykovski; Arthur C Trembanis; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOACOUSTICS DIV
|
| High-resolution multibeam sonar and state-of-the-art data processing and visualization techniques have been used to quantify the evolution of seafloor morphology and the degree of burial of instrumented mines and mine-shapes as part of the U.S. Office of Naval Research (ONR, Arlington, VA) mine burial experiment at the Martha's Vineyard Coastal Observatory (MVCO, Edgartown, MA). Four surveys were conducted over two years at the experiment site with a 455-kHz, Reson 8125 ... |
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| An Acoustic-Instrumented Mine for Studying Subsequent Burial |
Jan-2007 |
15 pages |
| Authors:
Sean Griffin; John Bradley; Thiele; Maurice Jr; Michael D Richardson; Peter D Thorne; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOACOUSTICS DIV
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| The U.S. Navy is supporting the research to develop and validate stochastic, time-dependent, mine burial prediction models to aid the tactical decision making process. This research requires continuous monitoring of both mine behavior during burial, and the near-field processes responsible for burial. A new instrumented mine has been developed that far exceeds the capabilities of the earlier optically instrumented mine in terms of the burial processes that can be measured. ... |
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| Demonstration of the Real-Time Tracking Gradiometer for Buried Mine Hunting While Operating From a Small Unmanned Underwater Vehicle |
Sep-2006 |
6 pages |
| Authors:
G Sulzberger; J Bono; G I Allen; T Clem; S Kumar; NAVAL SURFACE WARFARE CENTER PANAMA CITY FL
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| In many undersea conditions, optical sensors and sonar can be used to discriminate against sea mines. However, there are many conditions where these sensors are insufficient. For example, when a mine is fully buried these sensors are of little help. Under these conditions, additional sensor technologies are required. Since it is not affected by the medium, a technology of choice is magnetics. In the late 1990's a T-shaped gradiometer with ... |
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| Buried Object Classification using a Sediment Volume Imaging SAS and Electromagnetic Gradiometer |
Sep-2006 |
7 pages |
| Authors:
Daniel D Sternlicht; J K Harbaugh; Anjana K Shah; Michael L Webb; Richard Holtzapple; APPLIED SIGNAL TECHNOLOGY INC TORRANCE CA
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| To advance naval capabilities in identifying buried mines and unexploded ordnance, hybrid systems that fuse data from disparate sensors are being developed. This paper describes preliminary results of a classification engine that combines target features and classification parameters from a synthetic aperture Buried Object Scanning Sonar (BOSS) and an electromagnetic Real-time Tracking Gradiometer (RTG). The target characteristics that generate signals of interest for these sensors (acoustic backscatter and induced changes ... |
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| Multi-Sensor CSEM Technology for Buried Target Classification |
24 APR 2006 |
39 pages |
| Authors:
Mark E. Everett; Cam Nguyen; TEXAS A AND M UNIV COLLEGE STATION
|
| One of the challenges faced by geophysicists is development of improved electromagnetic induction (EMI) sensors and algorithms capable of recording target responses, isolating them from geological noise, and processing them to discriminate the nature of the target during cleanup operations. The SERDP project UX-1312 responded to this challenge. The project consisted of three tasks: sensor prototype development, software development, and integrated system test. This final report describes the accomplishments made ... |
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| Predicting the Distribution and Properties of Buried Submarine Topography on Continental Shelves |
05 FEB 2006 |
18 pages |
| Authors:
Neal Driscoll; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
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| Compile geological data and develop methods to predict the distribution and properties of features hypothesized to be responsible for sonar geoclutter. Contribute to the reduction or mitigation of geologic clutter observed on fleet sonar systems. Two issues define the problem. In area x, can the Navy expect geoclutter features and if so what are their sonar characteristics, i.e. channel orientation? If geoclutter features are expected in area x, will the ... |
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| In-Situ Landmine Neutralization by Chemical versus Thermal Initiation Deminer Preferences |
2006 |
7 pages |
| Authors:
Divyakant L. Patel; Sean P. Burke; ARMY COMMUNICATIONS-ELECTRONICS RESEARCH DEVELOPMENT AND ENGINEERING CENTER FORT BELVOIR VA
|
| This paper describes currently developed chemical and thermal landmine neutralization methods under the DoD Humanitarian Demining Research and Development (HD R&D) Program. It includes a table showing the differences among current detonation or demolition techniques, and among chemical and thermal systems. Comparative elements include the neutralization mechanism; neutralization effects; time required to neutralize mines; explosive, standoff, operational, transportation and storage requirements; quality control; reliability; human factors; effectiveness; applicability to buried ... |
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| Conceptual Model for Prediction of Magnetic Soil Properties |
13 DEC 2005 |
12 pages |
| Authors:
Brian Borchers; Remke Van Dam; NEW MEXICO INST OF MINING AND TECHNOLOGY SOCORRO
|
| Recent studies have demonstrated the potentially serious impact of magnetic soils on the detection of buried objects such as land mines and unexploded ordnance (UXO) using magnetometers and electromagnetic inductions sensors, two methods that are routinely used in clearance operations. Magnetic soils can cause both equipment malfunctions and an increase in false alarms due to the presence of anomalies that have a geologic or pedogenic origin. To improve the discrimination ... |
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| Development and Construction of a Camera System for Landmine Detection |
25 NOV 2005 |
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| Authors:
W. De Jong; J. G. Schavemaker; TNO Defence Security and Safety The Hague (Netherlands)
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| The project `Development and Construction of a camera system for landmine detection' aimed at the development of a camera system to aid in mechanical mine clearance and area reduction. This report describes the results of the last phase of this project. A demonstrator polarisation camera system for landmine detection has been built. Demonstrations of the system have been given at a Royal Netherlands Army test site, with the system mounted ... |
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| Analysis of 2-Axis Pencil Beam Sonar Microbathymetric Measurements of Mine Burial at the Martha's Vineyard Coastal Observatory |
SEP 2005 |
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| Authors:
Brendan R. Gotowka; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| The changing state of warfare has driven the US Navy's area of operations closer to shore into littoral coastal waters. Mine Warfare has been proven as an extremely effective means of battlespace control in these waters. Mines can be inexpensively mass produced and rapidly deployed over large areas. The most common type of mine in use is the bottom placed mine, an object with simple geometry that sits on the ... |
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| Utilisation of the Application of High Frequency Acoustics to Sediment Processes for Mine Burial Prediction |
SEP 2005 |
9 pages |
| Authors:
Peter D. Throne; Michael D. Richardson; Sean Griffin; Peter Traykovski; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS SEAFLOOR SCIENCES DIRECTORATE
|
| Over the past decade, high frequency acoustics, 0.5 MHz-5 MHz, has made significant contributions to the measurement of nearbed sediment processes. The capability of acoustics to provide co-located high temporal and spatial resolution profiles of the bed forms, the hydrodynamics, and the suspended sediments, is providing new insights into the interactions and feedback mechanisms of sediment transport. Acoustic instrumented mines, AIM's, were developed that could utilize this concept of acoustics, ... |
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| Standardized UXO Technology Demonstration Site Woods Scoring Record Number 449 (Geophex LTD.) |
AUG 2005 |
58 pages |
| Authors:
Larry Overbay; George Robitaille; ABERDEEN TEST CENTER MD
|
| This scoring record documents the efforts of Geophex LTD., to detect and discriminate inter unexploded ordnance (UXO) utilizing the APG Standardized UXO Technology Demonstration Site Woods. The scoring record was coordinated by Larry Overbay and the Standardized UXO Technology Demonstration Site Scoring Committee. Organizations on the committee include the U.S. Army Corps of Engineers, the Environmental Security Technology Certification Program, the Strategic Environmental Research and Development Program, the Institute for ... |
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| Estimation of a Buried Pipe Location by Borehole Radar |
25 JUL 2005 |
5 pages |
| Authors:
Kazunori Takahashi; Motoyuki Sato; TOHOKU UNIV SENDAI (JAPAN) GRADUATE SCHOOL OF ENVIRONMENTAL STUDIES
|
| A new parametric inversion technique to estimate a buried pipe's location was developed for borehole radar cross-hole measurements. This technique evaluates the shapes of the approximated and measured arrival time curves instead of the first arrival time itself or wavefield in conventional inversion or tomographic techniques. In this study, the authors propose an algorithm of the technique and demonstrate its performance for synthetic and measured data sets. |
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| Subcritical Detection of Targets Buried Under a Rippled Interface: Calibrated Levels and Effects of Large Roughness |
01 MAY 2005 |
11 pages |
| Authors:
Kevin L. Williams; E. I. Thorsos; D. Tang; J. L. Lopes; C. L. Nesbitt; R. Lim; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
| The paper describes recent results from an ongoing modeling and measurement investigation of shallow grazing angle acoustic detection of targets buried in sand. Measurements were performed in a 13.7-m deep test pool with a 1. 5-m layer of sand on the bottom. A silicone-oil-filled target sphere was buried under a rippled surface with contours formed by scraping sand with a machined rake. Broadband (10 to 50 kHz) transducers were placed ... |
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| Nearshore Navigation and Communication Based on Deliberate EM Signals and Theoretical, Numerical and Observational Studies of Coastal Ocean Electrdynamics |
APR 2005 |
18 pages |
| Authors:
Thomas B. Sanford; Robert H. Tyler; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
| This project began with an effort to understand and utilize environmental and deliberately produced electromagnetic (EM) signals in the coastal ocean. Our studies were undertaken to provide a means to communicate with and guide autonomous underwater vehicles (AUV) and other autonomous sensor systems, such as moored instruments. There is a need for non-acoustical methods to navigate and control AUVs, communicate with autonomous instruments, and detect submerged and buried objects in ... |
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| 3D Rigid Body Impact Burial Prediction Model (IMPACT35) |
2005 |
11 pages |
| Authors:
Peter C. Chu; Chenwu Fan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA NAVAL OCEAN ANALYSIS AND PREDICTION LAB
|
| Falling of rigid body through air, water, and sediment is investigated experimentally and theoretically. Two experiments were conducted to drop rigid cylinders with the density ratio around 1.8 into shallow water (around 13 m deep) in the Monterey Bay (Exp-1) and into the Naval Postgraduate School s swimming pool (Exp-2). During the experiments, we carefully observe cylinder track and burial depth while simultaneously taking gravity cores (in Exp-1). After analyzing ... |
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| Impact Burial of Cylinders in Soft Marine Sediments |
22 DEC 2004 |
16 pages |
| Authors:
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
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| Mine Burial by Scour: Results From the Gulf of Mexico Experiments |
MAY 2004 |
11 pages |
| Authors:
Grant R. Bower; Michael D. Richardson; Kevin B. Briggs; Paul A. Elmore; Conrad S. Kennedy; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| A 64 day experiment to characterize mine burial by scour was conducted in the winter of 2003 in water depth of 13 meters off Indian Rocks Beach (IRB) near Tampa Bay, Florida. lnstrumented and non-instrumented mines were located on both coarse and fine sand sediments. In addition to monitoring the mine burial (16 mines) the experiment included, measurements of sediments properties and oceanographic conditions, and a comparison of model prediction ... |
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| Acoustic Technology for Landmine Detection |
31 MAR 2004 |
40 pages |
| Authors:
James M. Sabatier; Andi G. Petculescu; MISSISSIPPI UNIV UNIVERSITY NATIONAL CENTER FOR PHYSICAL ACOUSTICS
|
| The Office of Naval Research issued Grant N00014-02-1-0346 for Optical Measurements of Ground Vibrations to the National Center for Physical Acoustics at the University of Mississippi. The University of Mississippi is involved in an applied research program to develop an acoustic technique to detect buried landmines. In this technique, the ground is excited using acoustic or seismic sources which elicit resonance in buried mines. This resonance causes increased amplitude in ... |
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| Buried Target Detection Using Time-Reversed Acoustics |
06 FEB 2004 |
|
| Authors:
David Pierson; T. F. Clark; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MARINE EARTH AND ATMOSPHERIC SCIENCES
|
| In the spring of 2000, a proposal was submitted to Mr. Ken Dial at the Office of Naval Research (ONR) to study a novel approach of time-reversed acoustics to detect targets buried in a littoral environment. The proposal was written by Dr. Thomas Drake, currently at ONR, and David Pierson, currently at John Hopkins University Applied Physics Laboratory (APL), under the advice of Dr. Tony Clark, currently at North Carolina ... |
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| Estimation of Mine Case Burial in a Mud-Covered Sea Bottom Using Acoustic Impedance Values Obtained from a Shipboard Fathometer |
FEB 2004 |
19 pages |
| Authors:
Donald J. Walter; Andrei Abelev; L. D. Bibee; Philip J. Valent; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| A 12 kHz Bottom Sediment Classification "BSC" system that characterizes the seabottom according to acoustic impedance estimates was used to obtain normal incident acoustic data for determination of bottom sediment composition in Southeast Pass Louisiana near the mouth of the Mississippi River, and in an area offshore Corpus Christi Texas. The BSC uses the bottom and subbottom echo from a hull mounted transducer or transducer array to determine the acoustic ... |
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| Development of the Navy's 3D Mine Impact Burial Prediction Model (IMPACT35) |
01-Jan-2004 |
11 pages |
| Authors:
Peter C Chu; Ashley Evans; Anthony Gilles; Timothy Smith; Victoria Taber; NAVAL POSTGRADUATE SCHOOL MONTEREY CA NAVAL OCEAN ANALYSIS AND PREDICTION LAB
|
| Falling of mine through air, water, and sediment is investigated experimentally and theoretically. Two experiments were conducted to drop cylindrical mine with the density ratio around 1.8 into shallow water (around 13 m deep) in the Monterey Bay (Exp-1) and into the Naval Postgraduate School's swimming pool (Exp-2). During the experiments, we carefully observe mine track and burial depth while simultaneously taking gravity cores (in Exp-1). After analyzing the gravity ... |
|
| Subcritical Detection of Targets Buried Under a Rippled Interface: Calibrated Levels and Effects of Large Roughness |
SEP 2003 |
10 pages |
| Authors:
J. L. Lopes; C. L. Nesbitt; R. Lim; K. L. Williams; E. I. Thorsos; UNIV OF WASHINGTON SEATTLE APPLIED PHYSICS LAB
|
| This paper describes results of an ongoing modeling and measurement effort investigating shallow grazing angle acoustic detection of targets buried in sand. The measurements were performed in a 13.7-meter deep, 110-meter long, 80-meter wide test pool with a 1.5-meter layer of sand on the bottom. A silicone-oil-filled target sphere was buried under a rippled surface with contours formed by raking the sand with a machined rake. Broadband (10 to 50 ... |
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| Going Deep: A System Concept for Detecting Deeply Buried Facilities From Space |
23 FEB 2003 |
69 pages |
| Authors:
Arnold H. Streland; AIR WAR COLL MAXWELL AFB AL
|
| Finding deeply buried facilities stands out as one of the toughest technical challenges in the Air Force's efforts to find, fix, target, track, engage and assess targets of interest anywhere on earth. Nations have located potential high-value, high-interest targets such as weapons of mass destruction (WMD), WMD manufacturing plants and storage areas, missile garrisons, fuel storage areas and command and control nodes underground. This paper will focus on the development ... |
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| Corrosion of Buried Mines |
DEC 2002 |
22 pages |
| Authors:
Stan Ostazeski; Leo F. Saubier; BATTELLE EDGEWOOD OPERATIONS MD
|
| This paper discusses how observations of corrosion in buried mines can improve our ability to predict corrosion in steel munitions buried in the US (i.e., unexploded ordnance (UXO)). It proceeds from the hypothesis that the corrosion that takes place in metals, joints, dissimilar metal interfaces, etc., that are present in mines, may be correlated with corrosion in UXO. Listings of buried landmines having steel casings are presented, along with country ... |
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| Vapor-Phase Transport of Explosives Compounds in Soils |
SEP 2002 |
66 pages |
| Authors:
R. Ravikrishna; Sally L. Yost; Cynthia B. Price; Charolett A. Hayes; Kalliat T. Valsaraj; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| The fate and transport of explosives in the air-filled pores within soil affect both the potential detection of buried ordnance by chemical sensors and vadose zone transport of explosives residues. The efficacy of chemical sensors and their potential usefulness for detecting buried unexploded ordnance (UXO) is difficult to determine without understanding how explosives chemical signatures are transported through soil. The objectives of this study were to quantify chemical signature transport ... |
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| Three Dimensional Hydrodynamic Mine Impact Burial Prediction |
Sep-2002 |
54 pages |
| Authors:
Ashley Evans; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
|
| Work Overview: 1) Participated in two critical path experiments within the ONR sponsored Mine Burial Prediction Program: First--Carderock Mine Drop Experiment, 10-14 Sept 2001 NSWC-CCD, Carderock, MD, 1/3 scale mine shapes, 5 meters depth; Second--Corpus Christi Mine Drop Experiment 2, 17 May 2002 Corpus Christi Mine Warfare Operating Areas, full scale mine drops, 16-18 meters depth. 2) Full data analysis of 1/15 scale mine drop (Gilless 2001) and 1/3 scale ... |
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| Scour and Burial of Bottom Mines |
SEP 2002 |
128 pages |
| Authors:
Douglas L. Inman; Scott A. Jenkins; SCRIPPS INST OF OCEANOGRAPHY LA JOLLA CA INTEGRATIVE OCEANOGRAPHY DIV
|
| A process-based model was developed to predict the burial of bottom mines. The model has been validated In field experiments conducted on the near shelf off La Jolla, CA. The model was used by SPAWAR/San Diego to evaluate optimal configurations for a mine neutralization device delivered by marine mammals. The model features a coastal classification system to facilitate model initialization for 7 coastal types. |
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| Broadband Focused Radar at Ground Penetrating Frequencies for Detecting Mines, Unexploded Ordnance, or Mobility Related Surface Layers |
15 JUN 2002 |
35 pages |
| Authors:
W. T. Wollny; QUICK REACTION CORP CARSON CITY NV
|
| Report developed under SBlR Contract for topic Army 00-027 effort is to produce a fully mobile, broadband radar system with a focused planar beam over approximately 10 MHz to 1000 MHz for the detection of buried objects and the detection of frozen or thawed layers which effect mobility. The proposed antenna configuration consisted of a contra-wound helix, to cover the frequencies from 10 MHz to 100 MHz, and an array ... |
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| ELF/VLF Electromagnetic Detection and Characterization of Deeply Buried Targets |
01 MAY 2002 |
44 pages |
| Authors:
Donald E. Barrick; CODAR OCEANS SENSORS LTD LOS ALTOS CA
|
| This is the Final Report for the SBIR Phase II effort entitled ELF/ VLF Electromagnetic Detection and Characterization of Deeply Buried Targets sponsored by the Defense Advanced Research Projects Agency. The various electromagnetic calculational tools coded as MATLAB routines delivered with the report constitute the goal of our effort. The report is in five parts: (1) a description of the Sommerfeld routines; (2) a description of the menu interface routines; ... |
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| Influences of Penetrometer Probe Tip Geometry on Bearing Strength Estimates for Mine Burial Prediction |
MAR 2002 |
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| Authors:
P. J. Mulhearn; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
|
| An important parameter for the prediction of mine burial on impact, when a mine is first laid, is the sediment bearing strength profile. A number of nations have been developing easily deployable penetrometers for measuring bearing strength relatively quickly. The plan would be to use these in route survey operations. Previous joint experiments by TTCP (The Technical Coperation Program) nations have found that the measured bearing strength decreases as the ... |
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| Sonar Detection of Buried Targets at Suberitical Grazing Angles: APL-UW Component |
2002 |
8 pages |
| Authors:
Kevin L. Williams; Eric I. Thorsos; Dajun Tang; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
|
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| SAR/GPR Matched Filter Processing for UXO Discrimination |
21-Dec-2001 |
32 pages |
| Authors:
MIRAGE SYSTEMS SUNNYVALE CA
|
| In order to achieve focused SAR images it is necessary to have accurate knowledge of the radar antenna position during its motion over the synthetic aperture. This position information is used to ensure proper focusing of the SAR image by phase compensating the data collected over the entire SAR path. This process is known as motion compensation and requires precise measurement of the position of the phase center of the ... |
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| Modeling and Analysis of a 3-D Asymmetric Mine-Soil-Hull Floor Interaction Problems with Mine Buried in Dry and Wet Sand |
SEP 2001 |
24 pages |
| Authors:
Aaron D. Gupta; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An above-ground 2.44 m x 2.44 m x 20 cm rolled homogeneous armor (RHA) plate with a total mass of 9000 kg located asymmetrically at a fixed horizontal 61 cm offset and a vertical 46 cm stand-off above a shallow-buried mine with an equivalent charge weight of 9.05 kg TNT and 15 cm depth of overburden in dry and wet sand has been modeled in 3-D using the CTH hydrodynamic ... |
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| Novel Acoustic Technique for UXO Discrimination |
30 JUN 2001 |
19 pages |
| Authors:
Thomas Bell; Nenad Gucunski; AETC INC SAN DIEGO CA
|
| Recent demonstrations have shown that magnetic and electromagnetic induction technology can reliably detect most buried unexploded ordnance (UXO). Unfortunately, current technology is unable to reliably discriminate between UXO and other items that pose no risk, and typical survey methods currently deployed have an excessive level of false alarms (i.e. marking of sub-surface anomalies that do not correspond to UXO). There is a need for systems that, when cued by standard ... |
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| NRL Mine Burial Experiments |
27 MAR 2001 |
24 pages |
| Authors:
Michael Richardson; Philip Valent; Kevin Briggs; John Bradley; Sean Griffin; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| Seabed-structure interactions are responsible for the burial of heavy objects, such as mines, pipelines, concrete breakwaters, platforms, debris, and other objects on the seafloor. In low shear strength muds, these objects are known to bury at impact or to sink into the sediment if the buoyant weight of the object exceeds the bearing capacity of the seafloor. In higher energy sandy sediments, burial by scour and fill, momentary or cyclic ... |
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| Numerical Modeling of Buried Mine Explosions |
MAR 2001 |
30 pages |
| Authors:
Gerald I. Kerley; KERLEY PUBLISHING CO ALBUQUERQUE NM
|
| The effects of buried mine explosions in various soil media are investigated by numerical hydrocode simulations. Tabular equations of state (EOS) for dry and wet sand are constructed. These (EOS) are used in CTH calculations of a steel plate suspended over the detonation of a TNT explosive charge buried in both media. Wet sand imparts significantly higher momentum to the plate than dry sand. Calculations in both two and three ... |
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| Mine Burial Impact Prediction Experiment |
SEP 2000 |
171 pages |
| Authors:
Peter C. Chu; Timothy B. Smith; Steven D. Haeger; NAVAL POSTGRADUATE SCHOOL MONTEREY CA INST FOR JOINT WARFARE ANALYSIS
|
| Mine Impact Burial Experiment (MIBEX) was conducted at Monterey Bay on May 23, 2000 using a simulated mine. During the experiment, we carefully observe mine track and mine burial depth while simultaneously take gravity cores. After analyzing the gravity cores, we obtain the bottom sediment shear strength data set. Such synchronous mine burial depth and shear strength data were used to evaluate the Navy's Impact Burial Prediction Model (IBPM) which ... |
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| Deeply Buried Facilities: Implications for Military Operations |
MAY 2000 |
49 pages |
| Authors:
Eric M. Sepp; AIR WAR COLL MAXWELL AFB AL
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| The problem in the early twenty-first century is that deeply buried underground facilities are becoming an increasingly important part of the defense establishments in many states. These facilities allow states to conceal the personnel, equipment, and command and control functions that are essential to the successful prosecution of a war. In general, these facilities can protect a state's most critical governmental and military functions and contribute to victory during war, ... |
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| Seabed-Structure Interactions in Coastal Sediments |
2000 |
20 pages |
| Authors:
Mike Richardson; Kevin Briggs; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
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| Seabed-structure interactions are responsible for the burial of heavy objects, such as mines, pipelines, concrete breakwaters, platforms, and other objects on the seafloor. In low shear strength muds, these objects are known to bury at impact or to sink into the sediment if the buoyant weight of the object exceeds the bearing capacity of the seafloor. In higher energy sandy sediments, burial by scour and fill, momentary or cyclic wave-induced ... |
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| Detection and Target-Strength Measurements of Buried Objects Using a Seismo-Acoustic Sonar |
DEC 1998 |
73 pages |
| Authors:
Patrick W. Hall; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This thesis describes the results of field experiments in which seismo-acoustic interface (Rayleigh) waves were employed to detect and measure the target strength of mine-like test objects buried in the near-surf zone. These experiments were conducted as part of an ongoing NPS research program to develop a seismo-acoustic sonar system for the detection of buried mines in the surf and, near-surf zones. An experimental seismo-acoustic sonar system, using linear force ... |
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Reports by Keyword(s)
*BURIED OBJECTS
