| Phase-Enhanced 3D Snapshot ISAR Imaging and Interferometric SAR |
28-Dec-2009 |
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| Authors:
Joseph T Mayhan; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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 | Previously, a novel formulation for the generation of three-dimensional (3D) inverse synthetic aperture radar (ISAR) images based on recent developments in high resolution spectral estimation theory was presented. Because this technique requires only snapshots of data, where a snapshot is defined as a block of Nyquist sampled frequency-time pulses of data, we refer to it as 3D snapshot imaging. Concomitant with these results, recent advances in interferometric SAR imaging have ... |
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| RF Radiation Environment Over Millstone Hill |
14-Dec-2009 |
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| Authors:
T A Cott; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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| This report documents a study of the RP radiation environment in the vicinity of the Lincoln Space Surveillance Complex radars. The focus of this HOPEhe study is a model-based analysis of the hazards to occupants of aircraft flying in the vicinity of the radars, comparing computed exposure levels with safety standards for the general public set by the Massachusetts Department of Public Health. |
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| Through-the-Wall Small Weapon Detection Based on Polarimetric Radar Techniques |
Dec-2009 |
46 pages |
| Authors:
Traian Dogaru; Calvin Le; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
 | In this report, we investigate techniques for small weapon detection in the context of sensing-through-walls radar sensors. Our approach exploits the radar wave polarization in order to discriminate between a human carrying a weapon and an unarmed human. We first develop a polarization optimization procedure for a rifle-like target, but demonstrate that this technique does not perform as expected in the presence of a human. Next, we introduce a more ... |
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| Waveform-Diverse Sensors |
Dec-2009 |
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| Authors:
Shannon D Blunt; KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE
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| The electromagnetic spectrum has become increasingly crowded in recent years as a result of the demand for higher bandwidths for greater communication throughput and finer resolution radar imaging. Thus efficient use of bandwidth is essential to meet the needs of a wide variety of technological disciplines. For radar applications perhaps the greatest challenges to attaining high spectral efficiency are the need for spectrally clean emissions that minimize the out-of-band interference ... |
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| Multi-Aspect Radar Algorithms (MARA) Study |
30-Nov-2009 |
44 pages |
| Authors:
SCI-TEQ INC HERNDON VA
|
| Sci-Teq, Inc. submits this report as the third quarterly report on the 18 month study entitled Multi-Aspect Radar Algorithms (MARA). The MARA study is investigating and defining a surveillance system concept for a net-sentric surveillance sensor system. The system will be comprised of multiple, geographically dispersed, multi-band, multi-static Inverse Synthetic Aperture Radar (ISAR) imaging sensors with co-located ESM sensors. The operational objective of these multi-sensor net-worked systems is to provide ... |
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| Investigation of ESF Triggers using Balloon-Based and Ground-Based Diagnostics |
05-Oct-2009 |
8 pages |
| Authors:
Kandula Niranjan; Duggirala Pallamraju; ANDHRA UNIV VISHAKHAPATNAM (INDIA) DEPT OF PHYSICS
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| It is widely believed that gravity waves trigger the occurrence of F-region irregularities. This inference of gravity wave seeding the irregularities was based on the Range-Time-Intensity maps of the incoherent scatter radar echoes. The radar-returned echoes of F-region irregularities are in the form of waves, with periodicities ranging from 60 minutes to 120 minutes. But, till this date no measurements have been carried out before the irregularities are actually triggered ... |
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| Multi-Input Multi-Output (MIMO) Radar - Diversity Means Superiority |
Oct-2009 |
7 pages |
| Authors:
Jian Li; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A multiple-input multiple-output (MIMO) radar system, unlike a standard phased-array radar, can transmit via its antennas linearly independent waveforms. We have made significant contributions on exploiting the waveform diversity offered by MIMO radar to achieve superior performance. First, we have considered a MIMO radar system where both the transmitter and receiver have multiple well-separated subarrays with each subarray containing closely-spaced antennas. Because of this general antenna configuration, both the waveform ... |
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| Development of the Phase Synchronization Circuit for Wirelessly Distributed Digital Phased Array |
Sep-2009 |
129 pages |
| Authors:
Yen-Chang Tsai; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The Wirelessly Distributed Digital Phased Array (WDDPA) is an ongoing research program at the Naval Postgraduate School (NPS) which has numerous possible applications in radar and communication systems. The WDDPA incorporates many array elements randomly or nonuniformly in the environment or on a platform. Array elements are synchronized and controlled over a wireless channel. Compared to conventional phased array systems, its advantages are adaptability, survivability and flexibility. Phase synchronization is ... |
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| The Use of Commercial Remote Sensing Systems in Predicting Helicopter Brownout Conditions |
Sep-2009 |
90 pages |
| Authors:
Christine K Rabaja; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Polarimetric Synthetic Aperture Radar (SAR) data from RADARSAT-2 is analyzed for detection of soils susceptible to helicopter brownout. Helicopter brownout occurs when downwash disturbs the dust and sand beneath the aircraft during takeoff, landing, and low altitude operations. Brownout may lead to pilot spatial disorientation and loss of control, causing helicopter damage or destruction, as well as personnel injury or death. The likelihood of helicopter brownout is related to soil ... |
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| Observation of Wave Energy Evolution in Coastal Areas Using HF Radar |
Sep-2009 |
20 pages |
| Authors:
Hans C Graber; Rafael J Ramos; Brian K Haus; ROSENSTIEL SCHOOL OF MARINE AND ATMOSPHERIC SCIENCE MIAMI FL DIV OF APPLIED MARINE PHYSICS
|
| The capability of phased-array HF radar systems to sample the spatial distribution of wave energy is investigated in different storm scenarios and coastal configurations. First, a formulation introduced by D. E. Barrick to extract significant wave height Hs from backscatter Doppler spectra was calibrated and subsequently tested (to assess bias and uncertainty) with data from seven different buoy/gauge stations collected during three different field experiments. Afterward, Hs observations were obtained ... |
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| Ambiguity Function Analysis for the Hybrid Mimo Phased-Array Radar (Postprint) |
Sep-2009 |
8 pages |
| Authors:
Muralidhar Rangaswamy; Daniel R Fuhrmann; J P Browning; MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| The Hybrid MIMO Phased Array Radar, or HMPAR, is a notional concept for a multisensor radar architecture that combines elements of traditional phased-array radar with the emerging technology of Multiple-Input Multiple Output (MIMO) radar. A HMPAR comprises a large number, MP, of T/R elements, organized into M subarrays of P elements each. Within each subarray, passive element level phase shifting is used to steer transmit and receive beams in some ... |
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| Multi-Aspect Radar Algorithms (MARA) Study |
31-Aug-2009 |
36 pages |
| Authors:
Donald Coleman; James K Hall; SCI-TEQ INC HERNDON VA
|
| Sci-Teq, Inc. submits this report as the second quarterly report on the 18 month study entitled Multi-Aspect Radar Algorithms (MARA). The MARA research study is investigating and defining a surveillance system concept for a net-sentric surveillance sensor system. The system will be comprised of multiple, geographically dispersed, multi-band, multi-static Inverse Synthetic Aperture Radar (ISAR) imaging sensors with co-located ESM sensors. The operational objective of the multi-sensor net-worked systems is to ... |
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| Validating the Modeling and Simulation of a Generic Tracking Radar |
28-Jul-2009 |
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| Authors:
H C Lambert; S R Vogel; A S Brewster; K Dunn; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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| This report proposes acceptability criteria for validating the modeling and simulation of a generic tracking radar. The approach is based on a statistical hypothesis test that strives to minimize risk to both the model user and the model maker. The validation process is limited to the comparison of a set of Monte Carlo realizations of judiciously selected validation metrics with single discrete-event observations made by the actual sensor. The effectiveness ... |
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| Quantum Enhanced Imaging by Entangled States |
Jul-2009 |
123 pages |
| Authors:
Doyle Nichols; NORTHROP GRUMMAN SYSTEMS CORP LINTHICUM HEIGHTS MD
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| The use of entangled states in a prospective standoff imaging sensor has been explored. Specifically, the question of whether enhanced performance (in terms of achievable resolution, in particular) may be obtained through the use of entangled states in a ghost imaging configuration has been investigated. The resiliency of such a system in the presence of transmission impairments that necessarily accompany sensors in a tactical environment, such as large optical loss, ... |
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| Climate Analysis and Long Range Forecasting of Radar Performance in the Western North Pacific |
01-Jun-2009 |
115 pages |
| Authors:
David Ramsaur; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The ability to predict the evaporation duct has important applications for naval activities, such as electronic counter-measures, surveillance, communications, and radar detection and tracking of submarine periscopes, low-flying missiles, aircraft, and surface combatants. This study addresses two major research questions: 1. Can state-of-the-science data sets, models, and methods be used to create more accurate and useful climatologies of atmospheric radar propagation? 2. Can skillful long range forecasts (LRFs) of evaporation ... |
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| Collaboration with Oregon State University at Duck, NC |
Jun-2009 |
5 pages |
| Authors:
William J Plant; WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB
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| A dual-polarized, coherent, X-band microwave radar called RiverRad was deployed at the Coastal Engineering Field Research Facility at Duck, NC in April, 2008. The purpose of the deployment was to utilize this calibrated radar to calibrate a marine radar operated by Oregon State University (OSU) on a long-term basis at Duck and to study microwave backscatter in the surf zone. Data from RiverRad were compared with those from the marine ... |
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| Successive Interference Cancellation in Rake Receiver for CDMA Signals |
Jun-2009 |
77 pages |
| Authors:
Stamatios Gkiokas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The objective of this thesis is to investigate various techniques of Successive Intracell Interference Cancellation (SIIC) for Wideband-Code Division Multiple Access (W-CDMA). These techniques can improve the performance of CDMA interceptors and enhance the operation of cellular mobile communication systems. The research focuses on the forward link (downlink) where orthogonal covering is employed. We examine three interference cancellation techniques that suppress the intracell multiuser interference. The first method is called ... |
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| Polarimetric Imaging for the Detection of Disturbed Surfaces |
Jun-2009 |
77 pages |
| Authors:
Michael E Eyler; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This work tested the ability of the fast time-division SALSA polarimetric camera of Bossa Nova Technologies, Ltd. to distinguish disturbed from undisturbed surfaces. Earth and asphalt were imaged, and the data was processed using standard ENVI (trademark) software. The polarization signature of the disturbed earth was not strong, even when processing was employed. The camera was better able to distinguish between the polarization characteristics of patched or disturbed asphalt and ... |
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| PAVE PAWS Early Warning Radar Operation Cape Cod Air Force Station, MA. Record of Decision |
Jun-2009 |
266 pages |
| Authors:
DEPUTY ASSISTANT SECRETARY (AIR FORCE) ENERGY ENVIRONMENT SAFETY AND OCCUPATIONA WASHINGTON DC
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| This document records the decisions of the United States Air Force with regard to the Supplemental Environmental Impact Statement (SEIS) for the continued operation of the Pave PAWS radar at Cape Cod AFS (December 2008) that was prepared to evaluate potential impacts to the human environment of the continued operation of the Solid-State Phased-Array Radar System (SSPARS), also known as PAVE (an Air Force program name) Phased Array Warning System ... |
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| Application of the Backward-Smoothing Extended Kalman Filter to Attitude Estimation and Prediction using Radar Observations |
Jun-2009 |
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| Authors:
Kyle C Volpe; MASSACHUSETTS INST OF TECH CAMBRIDGE
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| The Lincoln Attitude Estimation System (LAES), a new tool being developed for the Space Situational Awareness Group (SSAG) at MIT Lincoln Laboratory, integrates several existing hardware and software systems, with a backward-smoothing extended Kalman filter (BSEKF). LAES is intended to determine the rotational motion of a freely tumbling spacecraft from a sequence of discrete-time radar images. The raw range-Doppler returns are collected using a ground-based sensor, which is owned and ... |
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| Humanitarian Mine Finder Experiment for Humanitarian Demining (HD) |
Jun-2009 |
28 pages |
| Authors:
Stephen Huett; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
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| Problem Definition, Landmines: The hard part is DETECTING the mines and UXO. Current methods of detection and removal are slow and dangerous. Current funding (DoS and DoD) levels are inadequate to seriously address the problem. Mines and Unexploded Ordnance (UXO) are a major problem around the world. Hypothesis: An Airship equipped with multiple bands of synthetic aperture radar that operate in a full polar metric mode, when operated at low ... |
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| On Near-Field w-Projection for Radio Interferometric Imaging |
12-May-2009 |
14 pages |
| Authors:
Joseph Lazio; NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
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| This paper serves to elucidate the mathematical steps needed to apply near-field imaging over a significant (angular) area of regard, with specific application to the receiving sites of the Air Force Space Surveillance System (AFSSS, Space Fence). Cornwell has developed the mathematical formalism to merge near-field imaging with imaging over a wide field of view. The traditional far-field, narrow field-of-view imaging developed in radio astronomy can be extended to wide ... |
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| Signal and Image Processing Algorithms for the U.S. Army Research Laboratory Ultra-wideband (UWB) Synchronous Impulse Reconstruction (SIRE) Radar |
Apr-2009 |
68 pages |
| Authors:
Lam Nguyen; ARMY RESEARCH LAB ADELPHI MD
|
| The U.S. Army Research Laboratory (ARL), as part of a mission and customer-funded exploratory program, has developed a new low-frequency, impulse-based, ultra-wideband (UWB) synthetic aperture radar (SAR), which has been used as a test bed to support proof-of-concept demonstration for detecting concealed targets. The radar is intended to collect and process data at combat pace in an affordable, compact, and lightweight package. To achieve this, the radar is based on ... |
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| Multi-Target/Multi-Sensor Tracking using Only Range and Doppler Measurements |
Apr-2009 |
20 pages |
| Authors:
John Schindler; Leonid Perlovsky; Ross Deming; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV
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| A new approach is described for combining range and Doppler data from multiple radar platforms to perform multi-target detection and tracking. In particular, azimuthal measurements are assumed to be either coarse or unavailable, so that multiple sensors are required to triangulate target tracks using range and Doppler measurements only. Increasing the number of sensors can cause data association by conventional means to become impractical due to combinatorial complexity, i.e., an ... |
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| Modeling and Simulation Architecture for Studying Doppler-Based Radar with Complex Environments |
26-Mar-2009 |
78 pages |
| Authors:
Nicholas J Amato; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| This research effort develops a hybrid large-scale modeling and simulation framework that defines the requirements for a program to evaluate radar-aircraft-turbine-clutter interactions. Wind turbines and other moving structures can interfere with a radar's ability to detect moving aircraft because radar returns from turbines are comparable to those from slow flying aircraft. This interference can lead to aircraft collisions or crashes, reducing the safety for air traffic. Two radar applications, INSSITE ... |
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| MARSnet: Mission-aware Autonomous Radar Sensor Network for Future Combat Systems |
23-Mar-2009 |
169 pages |
| Authors:
Qilian Liang; TEXAS UNIV AT ARLINGTON DEPT OF ELECTRICAL ENGINEERING
|
| During the period of 7/1/2008 - 12/3 I/2008, we performed the following studies on radar sensor network and other related areas: I. Radar Sensor Network Using A New Triphase Coded Waveform: Theory and Application: 2 Sense-Through-Wall Channel Modeling Using UWB Noise Radar; 3. Orthogonal Pulse Compression Codes for MIMO Radar System; 4 Optimized Punctured ZCZ Sequence-pair Set: Design, Analysis and Application to Radar System; 5. A Triphase Coded Waveform: Design, ... |
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| Radar Observations of Turbulence Using MST and FMCW Radar (BRIEFING CHARTS) |
09-Mar-2009 |
20 pages |
| Authors:
Frank D Eaton; Gregory D Nastrom; NASTROM CONSULTING LLC SAINT CLOUD MN
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| Radar observation of turbulence using MST and FMCW radar. |
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| Frequency Diversity for Improving Synthetic Aperture Radar Imaging |
Mar-2009 |
151 pages |
| Authors:
Jawad Farooq; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| In this work, a novel theoretical framework is presented for using recent advances in frequency diversity arrays (FDAs). Unlike a conventional array, the FDA simultaneously transmits a unique frequency from each element in the array. As a result, special time and space properties of the radiation pattern are exploited to improve cross-range resolution. The idealized FDA radiation pattern is compared with and validated against a full-wave electromagnetic solver, and it ... |
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| Retroreflector for Photonic Doppler Velocimetry |
Mar-2009 |
114 pages |
| Authors:
Thomas J Lagoski; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| In order to meet the goals of the Department of Defense (DoD) for smaller and more accurate weapons, the Munitions Directorate of the Air Force Research Laboratory (AFRL/RW) has numerous projects investigating the miniaturization of weapons and munition fuze components. One of these efforts is to characterize the performance of small detonators. The velocity of the flyer, the key component needed to initiate a detonation sequence, can be measured using ... |
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| Radar Imaging with a Network of Digital Noise Radar Systems |
Mar-2009 |
168 pages |
| Authors:
Ashley L Schmitt; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Due to the threat of terrorism, today's enemy can be anyone and they can exist anywhere even in populated cities. Monitoring human activities in an urban environment is a difficult problem due walls, clutter, and other obstructions. This thesis discusses the development of a network of digital noise radars that operate simultaneously to track humans and non-human targets inside rooms and through walls. Each individual noise radar works by cross ... |
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| Two Dimensional Scattering Analysis of Data-Linked Support Strings for Bistatic Measurement Systems |
Mar-2009 |
93 pages |
| Authors:
William Keichel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Use of data-linked strings to support a bistatic antenna is being considered as a possible improvement to indoor bistatic radar cross section measurement systems. Analysis of candidate data-linked strings is required to understand the potential clutter contribution posed by such a system. The main objective of this research is to determine the scattering properties of four data-linked support string samples. Another goal is to determine the material properties of the ... |
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| Image Processing for Multiple-Target Tracking on a Graphics Processing Unit |
Mar-2009 |
79 pages |
| Authors:
Michael A Tanner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Multiple-target tracking (MTT) systems have been implemented on many di?erent platforms, however these solutions are often expensive and have long development times. Such MTT implementations require custom hardware yet o?er very little flexibility with ever changing data sets and target tracking requirements. This research explores how to supplement and enhance MTT performance with an existing graphics processing unit (GPU) on a general computing platform. Typical computers are already equipped with ... |
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| Application of Time-Frequency Representations To Non-Stationary Radar Cross Section |
Mar-2009 |
227 pages |
| Authors:
John McShane; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Radar Cross Section imaging of a non-wide sense stationary signal poses significant problems in identifying scattering centers in the post processed radar-generated image. A non-wide sense stationary RCS is typically encountered when moving parts on the target impress a phase shift into the backscatter signal that is uncorrelated to the previous return pulse. When the Fourier transform of the phase shifted complex signal is taken, range and cross range information ... |
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| Dynamic Channel Allocation in Wireless Networks Using Adaptive Learning Automata (Preprint) |
Mar-2009 |
8 pages |
| Authors:
Behdis Eslamnour; Maciej Zawodniok; S Jagannathan; MISSOURI UNIV-ROLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The bandwidth utilization of a single channel-based wireless networks decreases due to congestion and interference from other sources and therefore transmission on multiple channels are needed. In this paper, we propose a distributed dynamic channel allocation scheme for wireless networks using adaptive learning automata whose nodes are equipped with single radio interfaces so that a more suitable channel can be selected. The proposed scheme, Adaptive Pursuit Reward-Inaction, runs periodically on ... |
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| A Measure of Search Efficiency in a Real World Search Task (PREPRINT) |
16-Feb-2009 |
25 pages |
| Authors:
J G Trafton; Melissa R Beck; Maura C Lohrenz; LOUISIANA STATE UNIV BATON ROUGE
|
| In visual search, preattentive processes locate potential target regions and selective attention is directed to potential target locations. The current experiments examined the role of global visual clutter in participants' ability to deploy attention to target regions containing relatively more or less local clutter. Participants searched maps of high, medium, or low global clutter for a target in a high or low local clutter region. Global and local clutter influenced ... |
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| New Magnetic Materials and Phenomena for Radar and Microwave Signal Processing Devices - Bulk and Thin Film Ferrites and Metallic Films |
15-Feb-2009 |
38 pages |
| Authors:
Carl E Patton; COLORADO STATE UNIV FORT COLLINS DEPT OF PHYSICS
|
| ONR Grant ONR N00014-07-1-0597 has supported a four phase program. Under Phase (1), there were three materials thrusts, (a) hybrid pulse laser deposited and liquid phase epitaxy films of low loss cubic yttrium iron garnet (YIG) and uniaxial barium hexaferrite, (b) bulk and thick film ultra-dense fine grain pol) crystalline YIG materials, and (c) high magnetization metallic films, notably of Permalloy, iron, and FeTiN. Under Phase (2), the focus was ... |
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| Time-Frequency Analysis of a Moving Human Doppler Signature |
Feb-2009 |
34 pages |
| Authors:
Traian Dogaru; Calvin Le; Getachew Kirose; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| In this report we analyze the Doppler signature of a moving human with the purpose of finding temporal change patterns that would allow detection and classification of movers. The analysis is based on computer models that simulate the operation of a pulse-Doppler radar. We start with an animated human mesh in walking motion and compute the frame-by-frame radar return using electromagnetic solvers such as the Finite Difference Time Domain (FDTD). ... |
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| Covert, Intelligent, and Spectrally-Efficient MIMO-Based Noise Radar Networks |
31-Jan-2009 |
158 pages |
| Authors:
Ram M Narayanan; Wiriyanto Darsono; Kyoung-Deuk Kim; Wei-Jen Chen; Qihe Pan; Shrawan C Surender; PENNSYLVANIA STATE UNIV UNIVERSITY PARK OFFICE OF SPONSORED PROGRAMS
|
| The following tasks were accomplished: (1) Distributed adaptive beamforming using noise waveforms: The use of multiple radars for characterizing the radar cross section (RCS) of the target was investigated, and the RCS enhancement was quantified. A framework for inducing orthogonality in sequences and in polarization was developed to differentiate signals from various transmitters. Generalized Likelihood Ratio Test (GLRT) and Tapped Delay Line (TDL) beamforming were integrated. (2) RF tag approaches: ... |
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| Performance Limits and Design of MIMO for Sensor and Ad Hoc Wireless and Networks |
05-Jan-2009 |
8 pages |
| Authors:
Rick S Blum; LEHIGH UNIV BETHLEHEM PA DEPT OF COMPUTER SCIENCE AND ELECTRICAL ENGINEERING
|
| We have made excellent progress on studying appropriate signal processing and communication strategies for networks of dispersed nodes where each node may be equipped with a sensor. One area of focus has been on developing appropriate signal processing and communication strategies for networks which focus on target detection or hypothesis testing problems. There are many important military and non-military applications of this paradyme. In particular, hypothesis testing, often called signal ... |
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| A Diagnostic Approach to Weapon System Lifecycle Support: The Phalanx Close-in Weapon System |
Jan-2009 |
17 pages |
| Authors:
Aruna Apte; Rene Rendon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This study discusses a diagnostic approach to examining the lifecycle support system of a weapon system specifically illustrating the approaches for the US Navy Phalanx Close-in Weapon System (CIWS). The study gauges the status of current readiness and analyzes a snapshot of cost structures. The study identifies the program's influential cost factors and system performance drivers. As a diagnostic approach to the lifecycle support of the Phalanx Weapon System, the ... |
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| The Use of Geometric Diversity for Spectral Dominance in Underground Imaging |
Jan-2009 |
8 pages |
| Authors:
Danilo Erricolo; Lo; Lorenzo Monte; Rashid Ansari; Michael C Wicks; ILLINOIS UNIV AT CHICAGO
|
| Underground imaging of dielectric and conductive anomalies performed using ground penetrating radars (GPRs) requires expensive wideband systems to increase the resolution. The advent of tomographic principles in multi-monostatic GPRs dramatically improved the imaging capabilities and suggested the possibility of reducing the bandwidth of the probing waveform. In this work we propose to extend the tomographic principles to the case of below-ground distributed sensing, thus taking advantage of the geometric diversity. ... |
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| DOA Estimation and Multi-User Interference in a Two-Radar System |
Jan-2009 |
11 pages |
| Authors:
Muralidhar Rangaswamy; Fulvio Gini; Maria Greco; Alfonso Farina; PISA UNIV (ITALY) DIPARTIMENTO DI INGEGNERIA DELL' INFORMAZIONE
|
| In this paper, we investigate the impact of the presence of interfering radar on the target direction of arrival (DOA) estimation performed by the reference radar. The analyzed estimators are the pseudo-monopulse and the maximum likelihood techniques. The importance of the use of codes in multi-user radar system is highlighted in a simple scenario of two radars by calculating the root-mean square error of the estimators in different operational conditions ... |
|
| Defense Against Rocket Attacks in the Presence of False Cues |
Dec-2008 |
99 pages |
| Authors:
Lior Harari; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Rocket attacks on civilian and military targets, from both Hezbollah (South Lebanon) and Hamas (Gaza strip) have been causing a major operational problem for the Israeli Defense Force for over two decades. In recent years, U.S. forces have faced similar attacks in Afghanistan and Iraq against both remote military outposts and in the heart of Baghdad (Green zone). The insurgents are using mortars and short-range rockets, whose launch platforms have ... |
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| Automatic Identification System: AIS-A Reception of AIS-B, 2008 Study |
Dec-2008 |
|
| Authors:
Sandra Tavener; Tristan Cooper; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) MARITIME OPERATIONS DIV
|
| The use of the Automatic Identification System (AIS) has been mandated for ships over 300 gross tonne since December 2004. Through Border Protection Command, DSTO was tasked to assist the Australian Maritime Safety Authority with the assessment of the performance of AIS and a new variant AIS-B. AIS-B is a cut down version meant for smaller vessels but there have been concerns by the maritime community that AIS-B cannot be ... |
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| Chaotic Scrambling for Wireless Analog Video |
Dec-2008 |
8 pages |
| Authors:
KRISHNA MYNENI; Shawn D Pethel; Ned J Corron; Billy R Reed; Jonathan N Blakely; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND REDSTONE ARSENAL AL
|
| We report the implementation of an in-band chaotic scrambler for securing wireless analog video. In this demonstration system, an analog video signal is injected into a chaotic oscillator and the output is transmitted through a standard wireless video link. At the receiver, a descrambler separates the video from the chaotic signal in real time. Experimental results show the scrambled signal effectively hides the original video image, yet the descrambler recovers ... |
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| Experimental Progress Toward Detection and Identification of Electromagnetically Complex Structures |
Dec-2008 |
8 pages |
| Authors:
I Kohlberg; Von; S A Laven; N G Albritton; H M Jaenisch; J W Handley; T A Baginski; A S Hodel; R W McMillan; AMTEC CORP HUNTSVILLE AL
|
| Radio frequency (RF) signatures have been observed in the scattered return when a passive electromagnetically complex target structure is excited with a broadband pulse. The target range can be reliably determined up to a maximum range that is subject to equipment limitations. The range dependence of the return is found to be consistent with theoretical predictions, which include the role played by soil conductivity. Many activities, military and civilian, can ... |
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| Multi-Static Radar Signal Processing-Improved Interference Rejection, Tracking and Discrimination |
Dec-2008 |
11 pages |
| Authors:
Richard Schneible; Russell Brown; Michael Wicks; Yuhong Zhang; Robert McMillan; STIEFVATER CONSULTANTS MARCY NY
|
| In a multi-static radar (MSR) the transmit/receive aperture is divided into a number of sub-apertures that can be placed in various locations relative to each other. These locations can be chosen to optimize the performance of the radar in terms of some specific task. Two multi-static approaches have been investigated: 1. Closely spaced apertures distributed aperture radar (DAR) 2. Widely spaced apertures Realizing the greater capability of MSR's requires unique ... |
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| Ultra-wideband Radar for Building Interior Imaging |
Dec-2008 |
9 pages |
| Authors:
Traian Dogaru; Calvin Le; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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| This paper presents both numeric simulations and radar measurements related to through the wall imaging technologies. We present synthetic aperture radar (SAR) images obtained by the Army Research Laboratory (ARL) Forward-Looking Radar system during field experiments and compare those with the results of our Xpatch computer models. We also demonstrate a computational approach based on the Finite Difference Time Domain (FDTD) algorithm in order to obtain the SAR images of ... |
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| Estimating High-Resolution Directional Clutter Maps in Forested Terrain Using Airborne Lidar Data |
Dec-2008 |
9 pages |
| Authors:
K C Slatton; Pang-Wei Liu; Heezin Lee; Mike Campbell; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A priori knowledge of clutter environments is critical for understanding target detection performance from airborne sensors and optimally predicting future performance to aid in mission planning. Modern airborne lidar, also known as Airborne Laser Swath Mapping (ALSM), systems can acquire decimeter scale measurements of the 3D structure in forests and urban areas. From these measurements, high resolution clutter maps that account for variations in both 3D Cartesian coordinates and viewing ... |
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| High Fidelity Radar Stimulation For Distributed Hardware-in-the-Loop Simulations |
20-Nov-2008 |
15 pages |
| Authors:
James A Jr; Buford; James D Coombs; Anthony P Rainoldi; ARMY AVIATION AND MISSILE RESEARCH DEVELOPMENT ENG CTR REDSTONE ARSENAL AL SYSTEM SIMULATION AND DEVELOPMENT DIRECTORATE
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| Simulations are critical to the development and testing of the Ballistic Missile Defense System 1) Critical to the development of algorithms such as discrimination. methodologies 2) High fidelity radar stimulation provides a needed capability to assess the readiness and performance of the AN/TPY-2 radar. 3) High fidelity target and environment signature modeling improves. assessment capability 4) Real time execution capability is a key factor. 5) Application of high fidelity stimulation ... |
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Active & Passive Radar Detection & Equipment
