| Benchmark Problem for Radar Resource Allocation and Tracking Maneuvering Targets in the Presence of ECM |
SEP 96 |
68 pages |
| Authors:
W. D. Blair; G. A. Watson; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
 | This report presents a benchmark problem for tracking maneuvering targets. The benchmark problem involves beam pointing control of a phased-array (i.e., agile beam) radar against highly maneuvering targets in the presence of False Alarms (FAs) and Electronic Counter Measurements (ECM). The testbed simulation described in this report includes the effects of target amplitude fluctuntions, beamshape, missed detections, FAs, finite sensor resolution, target maneuvers, and track loss. Multiple waveforms are included ... |
|
| Torque Study on MK 42 Mod 3 Rear Fitting Safety Device Sector Gear |
SEP 96 |
14 pages |
| Authors:
Scott M. Pomeroy; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This study analyzed the torque on the sector gear of the Mk 42 Mod 3 Rear Fitting Safety Device (RFSD) used in variable time (VT) fuzes for Navy gun ammunition. The study was initiated following two proposals by the production contractor to modify the sector gear to produce increased torque and improve its reliability when used in 5-in .38 caliber gun ammunition. The study concluded that one of the proposals ... |
|
| Nonlinear Structural Load Distribution Methodology for the Aeroprediction Code |
SEP 96 |
80 pages |
| Authors:
Roy M. Mcinville; Frank G. Moore; Clint Housh; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| New methodology has been added to the NSWCDD Aeroprediction code to permit the distribution of the local linear and nonlinear aerodynamic loads along the body length and over the wing and tail lifting surfaces. The new techniques extend to both the PHI = 0 deg and PHI = 45 deg roll positions and to both windward and leeward lifting surfaces in the 45 deg orientation. The local loads are integrated ... |
|
| NSWCDD Tracking Benchmark 2.2 (Computer Diskette). |
SEP 1996 |
|
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
 | File characteristics: Software (4 files); Binary character set. Physical description: 1 computer diskette; 3 1/2 in.; high density; 1.4MB. System requirements: PC compatible; DOS; MATLAB version 4.0. This simulation program requires MATLAB 4.0 from MathWorks, Inc. This report presents a standard or benchmark for tracking maneuvering targets. This program uses Monte Carlo algorithms to simulate the adaptive tracking and maneuvering targets. |
|
| Linearized Kappa Guidance |
AUG 96 |
50 pages |
| Authors:
Demetrios Serakos; Ching-Fang Lin; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| An alternative solution to the ic-guidance dynamical equations is presented in this report. K-guidance is a midcourse guidance algorithm which maximizes intercept velocity. The nonlinear k-guidance dynamical equations are linearized. The linearization is via a nonlinear coordinate transformation and nonlinear feedback. The cost function is approximated by a quadratic cost. The linear quadratic regulator (LQR) method is then used to solve the optimal control problem. A closed form solution to ... |
|
| Analysis of the Probability Density Function of the Monopulse Ratio Radar Signal |
AUG 96 |
54 pages |
| Authors:
Winston C. Chow; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Monopulse radars are often used by the U.S. Navy Department to track airborne targets such as missiles attacking ships. In order to effectively make use of the target position data provided by the radar, an estimate of the radar output accuracy must be known. This report describes portions of research performed at Naval Surface Warfare Center, Dahlgren Division (NSWCDD) to develop statistical models of monopulse ratio behavior to improve accuracy ... |
|
| Computations and Experiments of Shallow Depth Explosion Plumes |
AUG 1996 |
86 pages |
| Authors:
W. G. Szymczak; J. M. Solomon; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| A mathematical model and computational code are validated for predicting shallow depth explosion plume behavior. The model is based on a generalized formulation of hydrodynamics and uses an incompressible liquid assumption. This formulation is well suited for predicting long-time bubble and plume dynamics. Initial conditions for the model are derived from spherically symmetric bubble theory, combined with empirical measurements, The effects of the spray dome caused by the reflection of ... |
|
| Combat Systems Department Employee Recognition System |
AUG 1996 |
40 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This handbook contains two types of information: guidelines and instructions. The guidelines provide a foundation of purpose, assumptions, principles, expectations and attributes the Employee Recognition System is designed to reflect. These guidelines stand first and foremost as the foundation for understanding why the Employee Recognition System exists, how to implement it, and how to change it. The guidelines are the most important aspect of the Employee Recognition System and should ... |
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| Hazard Division 1.2 Open Air Testing - Summary of Results |
Aug 1996 |
23 pages |
| Authors:
W D Houchins; Swisdak; M M Jr; M J Gould; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Since 1990, there have been significant advances in our knowledge of the consequences and processes involving the accidental ignition of stacks of Hazard Division (HD) 1.2 ammunition stored in the open. This work has been jointly sponsored by the United Kingdom Explosives Storage and Transport Committee (UK ESTC) and the United States Department of Defense Explosives Safety Board (US DDESB). Twelve tests have been conducted under the auspices of this ... |
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| MIRAGES IN THE MARINE BOUNDARY LAYER - COMPARISON OF EXPERIMENT WITH MODEL, |
JUL 1996 |
|
| Authors:
NATHAN PLATT; STEPHEN M. HAMMEL; Joseph W. Trahan; HOMAR RIVERA; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| (U) THIS PAPER DISCUSSES THE RESULTS OF TESTS INVOLVING A COORDINATED COLLECTION OF INFRARED IMAGING DATA FROM TWO IR SENSORS TOGETHER WITH METEOROLOGICAL DATA FROM VARIOUS LOCATIONS. BOTH AIR AND WATER TEMPERATURES WERE MEASURED AND USED AS INPUT TO A REFRACTIVE RAY-BENDING SIMULATOR DEVELOPED AT NSWCDD. THE PAPER COMPARES EXPERIMENTAL OBSERVATIONS OF MIRAGES WITH PREDICTIONS, GIVING A DETAILED MAPPING OF THE MULTIPLE IMAGE MIRAGE EFFECTS. A KEY FEATURE OF THE ... |
|
| EX 419 Multifunction Fuze Monolithic Microwave Integrated Circuits Electromagnetic Vulnerability Tests Brief Presented at the Annual American Defense Preparedness Association Fuze Conference (40th) |
JUN 96 |
19 pages |
| Authors:
Harold C. Wendt; Fritz E. Newcomer; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This brief includes the top level status of the current Multifunction Fuze (MFF) configuration as well as the process with which we developed the electromagnetic vulnerability (EMV) tests, an overview of the Transmitter (TX) & Receiver (RX) Monolithic Microwave Integrated Circuit (MMIC) designs, the details of the EMV tests, and wrap-up with conclusions. |
|
| Hypervelocity Wind Tunnel No. 9 Mach 7 Thermal Structural Facility Verification and Calibration |
JUN 96 |
70 pages |
| Authors:
John F. Lafferty; Daniel E. Marren; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report summarizes the verification and calibration of the new Mach 7 Thermal Structural Facility located at the White Oak, Maryland, site of the Dahlgren Division, Naval Surface Warfare Center. This effort was in support of the development of a thermal structural ground testing capability for interceptor seeker windows and radomes. The new facility is located in the Hypervelocity Wind Tunnel No. 9 complex and uses common gas supply and ... |
|
| Absolute Alignment of Sensors |
MAY 96 |
88 pages |
| Authors:
Ronald E. Helmick; Jeffrey E. Conte; Theodore R. Rice; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Absolute alignment refers to the process of determining the true bias or offset errors in the data reported by a sensor. This report develops an algorithm for absolutely aligning the positional data reported by a tracking sensor using a target whose location is measured by the sensor and whose location can be precisely determined by some technique independently of the sensor's measurements. The algorithm also requires the location of the ... |
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| Implementation and Application of the P-alpha Equation of State in the DYSMAS Code |
MAY 96 |
72 pages |
| Authors:
Andrew B. Wardlaw Jr.; Reid McKeown; Howard Chen; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report describes the implementation of the Mie-Gruneisen and P- alpha equations of state in the DYSMAS code. The motivation for these enhancements is to provide an equation of state that treats partially saturated sand. The pores in the P-alpha model are used to simulate the sand pore volume free from water, while the Mie-Gruneisen equation of state accounts for the water-grain mixture. Additionally, the Mie-Gruneisen equations of state provides ... |
|
| Inverse Semigroups and Boolean Matrices |
MAY 96 |
53 pages |
| Authors:
Stephen Lipscomb; Chris Dupilka; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Following its fragmentary beginnings in the 1920s and 1930s, the algebraic theory of semigroups has grown from seminal attempts at generalizing group theory into a vast and independent branch of algebra. One subbranch is the extensively developed and exceptionally promising class of inverse semigroups. Intuitively speaking, these semigroups are to partial symmetry what groups are to symmetry. Here we describe software designed to multiply elements of certain inverse semigroups, just ... |
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| Focus on Mission Teams: Report on a Warfare System Engineering Workshop |
MAY 1996 |
21 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report is the product of an effort to reinvent the Navy's process for transforming operational needs into warfare systems and combatants. The objective is to articulate a framework and strategy that fosters teamwork across organizational lines to crate a new generation of warships, designed from the keel up to enable onboard mission teams to act as integral parts of a joint operating force and to set a new standard ... |
|
| AEGIS Software Engineering Process Document. Change 4 |
01 APR 96 |
87 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
|
| Fundamentals and Foundations of Mobile Long-Range Ballistic Missiles |
APR 96 |
127 pages |
| Authors:
Kee S. Chun; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This publication is a training guide explaining the fundamentals and foundations of the long range ballistic missile weapon systems launched from moving bases such as submarine or aircraft. Since the land based missiles are essentially no different from the missiles launched from the moving bases except that the bases are fixed on the earth (without rotational and linear motions), the theory and analyses explained in this training guide would be ... |
|
| Proceedings of the Reverberation Chamber and Anechoic Chamber Operators Group Meeting Held in Dahlgren, Virginia on 5-7 December 1995 |
MAR 96 |
447 pages |
| Authors:
Michael Harfield; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This document presents the proceedings of the Anechoic Chamber and Reverberation Chamber Operators Group Meeting, which was held at the Naval Surface Warfare Center Dahlgren Division (NSWCDD) from 5 through 7 December 1995. The meeting was hosted by NSWCDD's Electromagnetic Effects Branch (F52) and was chaired by Michael Hatfield. Topics ranging from 'Electromagnetic Compatibility Testing of Electric Cars' to 'Radio Frequency (RF) Coupling to Commercial Aircraft Avionics' were presented. The ... |
|
| Naval Surface Warfare, Dahlgren Division Technical Digest - 1996 Issue: Expeditionary Warfare |
96 |
171 pages |
| Authors:
Robert L. Stiegler; Robert V. Gates; Daniel E. Harris; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| In... From the Sea and Forward... From the Sea, the Secretary of the Navy, The Chief of Naval Operations, and the Commandant of the Marine Corps set the strategic direction for Naval Services into the 21st century. The strategy places an unprecedented emphasis on the ability to operate in the littoral environment; that is, those regions relating to or existing on a shore or coastal region, within direct control of ... |
|
| Naval Surface Warfare Center Dahlgren Division, Technical Digest; Expeditionary Warfare |
1996 |
170 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The Naval Surface Warfare Center Dahlgren Division Technical Digest presents unclassified articles, contributed primarily by Division scientists and engineers on selected research and development programs. The Dahlgren Division, under the leadership of the Naval Surface Warfare Center provides research development, test and evaluation, engineering, and Fleet support for surface warfare systems, surface ship combat systems, ordnance, nines, amphibious warfare systems, mine countermeasures, special warfare systems, Marines Corps weaponry systems and ... |
|
| Optimal Thrust Allocation for TBM Interceptor Midcourse Guidance |
96 |
13 pages |
| Authors:
John A. Lawton; Craig A. Martell; Robert J. Jesionowski; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Interceptors for tactical ballistic missile defense typically are conceived to have midcourse phases that make corrections to the original interceptor free-flight path based on updated threat state estimates from the filter associated with a remote sensor. Some concepts call for one midcourse correction, while others call for more frequent corrections. The goal of this study is to find the optimal frequency of midcourse corrections from the point of view of ... |
|
| The Reentry Systems Application Program (RSAP) |
96 |
42 pages |
| Authors:
Alfred M. Morrison; John S. Vamos; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| In this age of reductions in strategic nuclear forces and decreasing defense budgets, economics has forced the refurbishing of currently deployed systems and the extension of their operational life expectancies, rather than the building of new systems. The issue of greatly extending the useful age of components and material systems beyond their design lives, from approximately 20 years to as much as 60 years, is a problem that the reentry ... |
|
| Extension of the NSWCDD Aeroprediction Code to the Roll Position of 45 Degrees |
DEC 95 |
155 pages |
| Authors:
Frank Moore; Roy McInville; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The NSWCDD Aeroprediction Code has been extended to the roll position of 45 degrees (or fins in cross or "x" orientation). New technology developed includes wing body and body wing interference factors for this roll orientation and to angles of attack of 90 degrees; new semi-empirical wing tail interference models for both the fins in 0 and 45 degrees roll positions; and approximate methods to estimate wing alone center of ... |
|
| Total Ship System Engineering Vision and Foundations |
DEC 95 |
71 pages |
| Authors:
Bernard G. Duren; James R. Pollard; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report considers an effort to reinvent the process by which the Navy transforms operational requirements into surface combatants. The objective is to articulate a new framework for total ship system engineering. For this, three things are necessary: a culture of teamwork permitting a unified system engineering effort; a common framework for total ship system engineering; and agreed-to concepts, standards, and tools for design integration. The work is being conducted ... |
|
| Using GPS to Determine an Astronomic-Geodetic Transformation for a Precise Azimuth Reference (PAR) |
DEC 95 |
57 pages |
| Authors:
Bruce R. Hermann; James Cunningham; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| A technique is presented to generate a transformation between the astronomic and geodetic reference frames. The transformation is based on knowing the orientation of a plane in both reference frames. The plane's astronomic orientation is assumed to be known. The geodetic orientation is determined using Global Positioning System (GPS) kinematic relative positioning. For the problem addressed in the report, the plane is a window used to make astronomic observations at ... |
|
| An Experimental Investigation of Organized Turbulent Motions and Wall- Pressure Fluctuations in Complex Flows |
DEC 95 |
147 pages |
| Authors:
Mark Kammeyer; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The relationship between high-amplitude wall-pressure peaks and near- wall flow structures has been studied for both equilibrium and disturbed turbulent boundary layers. The disturbed flow was that formed downstream of reattachment of the flow over an aft-facing step. In this case, the disturbances were primarily confined to the outer regions of the boundary layer. Simultaneous measurements of the fluctuating wall-pressure and the streamwise and wall-normal velocity were obtained. These measurements ... |
|
| Cooperative Research and Development Agreement (CRADA) Guidebook |
DEC 95 |
20 pages |
| Authors:
Ramsey D. Johnson; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Authorization for Government-operated Federal laboratories to enter into Cooperative Research and Development Agreements (CRADAs) was initially provided by the Stevenson-Wydler Technology Innovation Act of 1980, which was amended by the Federal Technology Transfer Act of 1986. The Department of Defense and the Department of the Navy have each issued specific guidelines governing technology transfer. This guidebook was prepared for the Naval Surface Warfare Center, Dahlgren Division (NSWCDD), Dahlgren, Virginia, and ... |
|
| Preliminary Analysis of Vertical-Motion Detection for Low-Elevation Targets with Doppler Processing at W-Band |
OCT 95 |
41 pages |
| Authors:
G. W. Groves; J. E. Conte; W. D. Blair; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The detection of vertical motion of a low-elevation target in multipath by frequency analysis using millimeter waves such as W-band radar is considered. Target vertical motion can be detected if the range rate of the image differs sufficiently from that of the target itself, so that their Doppler shifts allow resolution of the target return from its image. This observed difference in frequency provides additional information on target position and ... |
|
| Multiset Approach to Discrimination of Spatial Statistics |
OCT 95 |
15 pages |
| Authors:
George W. Rogers; Carey E. Phiebe; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The need to discriminate and classify spatial patterns is central to pattern recognition. The emergence of the field of computational statistics, made possible by recent advances in digital computing, has opened up a new way of approaching pattern recognition. In particular, it is no longer necessary to assume restrictive statistical models for spatially correlated data. It thus becomes important to develop model-free approaches to the description of spatial patterns. (AN) ... |
|
| Precise Absolute Navigation: An Evaluation of PPS Position Management |
OCT 95 |
69 pages |
| Authors:
Bruce R. Hermann; Bonnie S. Risinger; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report demonstrates a method whereby the Precise Positioning Service (PPS) solutions recorded in the field can be reprocessed at a later time with precise ephemerides. The reprocessing with precise ephemerides improves the quality of the navigation solutions compared with the solutions obtained when the broadcast ephemerides are used. The Precise Absolute Navigation (PAN) algorithm described in this paper avoids the need to reprocess the Selective Availability-(SA-) corrected observations. However, ... |
|
| Use of the NSWCDD Weather Databases for Prediction of Atmospheric Transmission in Common Thermal Imaging Sensor Bands |
OCT 95 |
34 pages |
| Authors:
Daniel E. Austin; Kenneth C. Hepfer; Marilyn R. Rudzinsky; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| An important factor in calculating performance ranges for thermal imaging sensors (TIS) is the atmospheric transmission. The infrared energy from a target must first pass through a section of the atmosphere before reaching the TIS aperture. This atmosphere will attenuate the signal. The amount of attenuation depends on the sensor band and weather conditions, and may have a considerable affect on the strength of the received signal. Usually a complex ... |
|
| Theodolite Accuracy Statistical Analysis Methodology |
SEP 95 |
36 pages |
| Authors:
Winston C. Chow; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report discusses the THEODOLITE computer program and algorithm. THEODOLITE is a FORTRAN program designed to provide information, based upon probability theory, on the reliability of the intersection data and its corresponding estimate of bullet splashdown locations calculated by the DERANGE program. The DERANGE program takes angular THEODOLITE readings and computes estimated bullet impact points. DERANGE is useful for determining ammunition quality. The THEODOLITE algorithm is useful as are liability ... |
|
| Estimation Theory with Fractional Gaussian Noise |
SEP 95 |
30 pages |
| Authors:
Winston C. Chow; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Physical processes often cannot be accurately modeled as purely deterministic mathematical processes because of the random aspects of their behavior. This unpredictable aspect is often statistically modeled as Gaussian white noise. This research developed an optimal estimator for parameters and states of systems driven by another type of noise, known as fractional Gaussian noise (FON) processes. These stochastic processes can model systems containing long-term, slowly decreasing time-correlated random disturbances. Examples ... |
|
| Derivation of Recursive Update Equations for Joint Representation Mixture Models |
SEP 95 |
31 pages |
| Authors:
George W. Rogers; Richard A. Lorey; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The joint representation mixture model is defined, likelihood functions corresponding to different levels of data categorization with respect to class are presented along with the iterative expectation-maximization (E-M) equations, and the resultant recursive E-M equations are derived. |
|
| Dahlgren Division Publications Format Guide |
AUG 95 |
72 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This Guide is to be used to prepare Naval Surface Warfare Center, Dahlgren Division publications including technical reports, technical notes, miscellaneous publications, and administrative publications. It is intended to unify publications format, review, approval, and distribution at Dahlgren, Virginia, and Coastal Systems Station, Panama City, Florida. |
|
| Nonparametric Multisensor Track Initiation Method for Nonuniform Nonstationary Environments Part II: A Comparison of M/N and ANMSTI Track Initiation Techniques Applied to the Wallops Island Multisensor Integration Experiment |
JUL 95 |
21 pages |
| Authors:
Robert J. Pawlak; Ron A. Stapleton; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This follow-on report compares the performance of the adaptive nonparametric multisensor track initiation (ANMSTI) algorithm to that of conventional M out of N (MIN) track initiation algorithms, for a test set composed of concurrent radar and infrared search and track (IRST) data. To present a fair comparison of the various techniques, both false track initiation rates and track initiation times are analyzed in this report. While the analysis shows that ... |
|
| Derivation of Joint Representation Mixture Model Equations |
MAY 95 |
21 pages |
| Authors:
George W. Rogers; Richard Lorey; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| One of the problems that arises in many large-scale applications of mixture models to density estimation is that, as the size of the data set increases, the class labeled data becomes a (proper) subset of the total data set. That is, while many small data sets may have all the observations labeled as to class membership, large data sets often consist of labeled subsets plus a potentially large unlabeled subset. ... |
|
| Improved Method for Calculating Exact Geodetic Latitude and Altitude |
APR 95 |
15 pages |
| Authors:
Isaac Sofair; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| An efficient model for transforming Earth-centered, Earth-fixed coordinates to geodetic coordinates is presented. The model systematically derives exact expressions for the geodetic latitude and altitude, which are free of singularities. To the author's best knowledge, no such expressions exist in the literature. |
|
| Real-Time Bias Estimation and Alignment of Two Asynchronous Sensors for Track Association and Fusion |
APR 95 |
66 pages |
| Authors:
Jeffrey E. Conte; Ronald E. Helmick; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| An extensive simulation study of the problem of relatively aligning two sensors that measure range, bearing, and elevation is described in this report. Simple simulations are used to demonstrate the effects of alignment errors on multisensor tracking. The theory and algorithms for relatively aligning the sensors are briefly summarized. This work presents the extension and simulation of algorithms to permit the use of asynchronous data. This is accomplished by using ... |
|
| AEGIS Software Engineering Process Document. Change 3 |
27 MAR 95 |
106 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| System Definition: In the System Definition Phase, analysis is performed to define requirements the system must support and to validate new functional capabilities. System requirements are defined and allocated to elements, and functional interface data are identified. System test and simulation requirements are determined. The conduct of a successful System Design Review (SDR), marked by PMS4OOB authorization to proceed, closes this phase. This review is an assessment of the completeness ... |
|
| The 1995 Version of the NSWC Aeroprediction Code: Part 1. Summary of New Theoretical Methodology |
FEB 95 |
111 pages |
| Authors:
Frank G. Morre; Roy M. Mcinville; Tom Hymer; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The NSWC Aeroprediction Code has been extended to angles of attack (AOA) greater than 30 deg. To accomplish this, several data bases were used to approximate the nonlinearities in individual missile component aerodynamics. Theoretical aerodynamic methods are used at small AOA. The new semiempirical model was applied to several configurations and the empirical constants adjusted to eliminate some of the errors associated with wind tunnel measurements of individual missile component ... |
|
| Target Tracking Filter Study for Command-All-The-Way Intercepts |
Feb 1995 |
84 pages |
| Authors:
S A Hoffman; W D Blair; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| In command-all-the-way (CAW) interceptor guidance, an interceptor missile receives all acceleration commands from guidance laws in the weapons system at the launch platform, where a radar is used to track both the missile and the target. Since the missile uses no terminal homing in CAW, highly accurate state estimates of both the interceptor missile and the target are needed for the guidance algorithms to provide acceleration commands to the interceptor ... |
|
| Infrared Refraction and Mirages |
JAN 95 |
70 pages |
| Authors:
Bill Trahan; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This document discusses infrared refraction in the atmosphere and the formation of mirages. It provides some measurements of infrared refraction recorded during a field test, as well as images of mirages in the infrared. (MM) |
|
| Detection Range Performance-Horizon Infrared Surveillance Sensor (HISS). Phase 2 |
JAN 95 |
64 pages |
| Authors:
Patrick A. Dezeeuw; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The Horizon Infrared Surveillance Sensor (HISS) Phase 2 system was involved in field testing at Wallops Island, Virginia from November 1993 through April 1994. This report discusses the HISS project and presents results from the analysis of system detection range performance. The HISS Phase 2 detection range performance has been used to demonstrate IR contributions to an integrated sensor system and to verify detection range predictions and improve the fidelity ... |
|
| Augmentation of High-Altitude Maneuver Performance of a Tail-Controlled Missile Using Lateral Thrust |
95 |
8 pages |
| Authors:
William R. Chadwick; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Tactical ballistic missiles (TBM's) may experience severe spiral maneuvers as they reenter the earth's atmosphere. It has been estimated that these maneuvers may increase in magnitude from 1 to 10 g's as the vehicle descends in altitude from 100 to 60 kft. The maneuvers also occur within the frequency range 0.5 to 1.0 Hz. This imposes the greatest difficulty on present- day proportional navigation interceptors. To hit these targets the ... |
|
| Parallel Block Implicit Integration Technique for Trajectory Parallelism |
DEC 94 |
39 pages |
| Authors:
Alan E. Rufty; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| This report describes the evaluation of a Parallel Block Implicit (PBI) integration technique in a simplified missile trajectory. This project was carried out to ascertain the suitability of PBI techniques when modest amounts of parallelism are available; that is, when 3 to 10 processors are allocated per missile trajectory. The PBI technique was first evaluated on a serial mainframe computer before it was implemented in parallel on an INMOS TRANSPUTER ... |
|
| GPS Orbit Estimation and Station Coordinate Improvement Using a 1992 IGS Campaign Data Set |
OCT 94 |
62 pages |
| Authors:
Everett R. Swift; M. W. Gouldman; Michael J. Merrigan; Virginia L. Curtis; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| Extensive orbit estimation and station coordinate improvement studies have been conducted using 3 weeks of Global Positioning System (GPS) pseudorange and carrier phase data from 34 globally distributed Stations collected during the 1992 International GPS Geodynamics Service Test Campaign (IGS 92). These stations consisted of the 10 Defense Mapping Agency (DMA) and Air Force GPS tracking sites and 24 IGS Rogue receiver sites. In all orbit fits that included the ... |
|
| Statistical Studies of the Monopulse Ratio |
OCT 94 |
68 pages |
| Authors:
Gordon W. Groves; William D. Blair; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The complex sum and difference phasers in a monopulse system provide four real quantities that are subject to random errors because of noise. Consequently, the monopulse ratio (MR), which depends on these four measured quantities, is a stochastic variable. The joint distribution of the real and imaginary parts of the MR is obtained for several cases under the assumption that the primary variables have a four-variate Gaussian distribution. The marginal ... |
|
| Naval Surface Warfare Center Dahlgren Division. Technical Digest. Ship Defense Technology. September 1994 |
SEP 94 |
155 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| CONTENTS - Guest Editor's Introduction: Towards A Proactive Surface Force-The Role of Ship Defense in the 21st Century; Short-Range Antiair Warfare Missile Systems Engineering; Integrated Interior Communications and Control-Engineering Validation of a Total Ship Architecture; Tactical Ballistic Missiles Trajectory State and Error Covariance Propagation; Superconducting Magnetic Sensors for Mine Countermeasures; Managing the Dynamics of the Electromagnetic Environment to Maximize Combat System Performance Electronic Warfare in Ship Defense Signal Simulators Used ... |
|
Reports by Corporate Author
