| Proceedings of the Antenna Applications Symposium (32nd) Held in Monticello, Illinois on 16-18 September 2008. Volume 2 |
20-Dec-2008 |
265 pages |
| Authors:
Daniel Schaubert; J D Wolf; T L Roach; J T Bernhard; D Filipovic; G Potvin; D Fontaine; Y Saito; J-M Rollin; L M Paulsen; M J Buckley; M W Elsallal; J B West; R J Mailloux; S G Santarelli; T M Roberts; D Luu; M Stasiowski; D Schaubert; Z Popovic; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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 | The Proceedings of the 2007 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays millimeter wave antennas simulation and measurement of antennas integrated antennas and antenna bandwidth and radiation improvements. |
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| Proceedings of the Antenna Applications Symposium (32nd) Held in Monticello, Illinois on 16-18 September 2008. Volume 1 |
20-Dec-2008 |
|
| Authors:
M W Elsallal; T L Roach; J T Bernhard; D Filipovic; G Potvin; D Fontaine; Y Saito; J-M Rollin; Z Popovic; J D Wolf; L M Paulsen; J B West; R J Mailloux; S G Santarelli; T M Roberts; D Luu; M Stasiowski; D Schaubert; M J Buckley; D H Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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 | The Proceedings of the 2008 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation, and measurement of antennas integrated antennas and antenna bandwidth and radiation improvements. |
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| Proceedings of the 2007 Antenna Applications Symposium. Volume 2 |
20 DEC 2007 |
300 pages |
| Authors:
Daniel Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2007 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation and measurement of antennas, integrated antennas, and antenna bandwidth and radiation improvements. |
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| Proceedings of the 2007 Antenna Applications Symposium, Volume 1 |
01 DEC 2007 |
281 pages |
| Authors:
Daniel Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| The Proceedings of the 2007 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays millimeter wave antennas simulation and measurement of antennas integrated antennas and antenna bandwidth and radiation improvements. |
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| Proceedings of the Antenna Applications Symposium (30th) Held in Monticello, Illinois on 20-22 September, 2006. Volume 1 |
26 FEB 2007 |
251 pages |
| Authors:
Daniel Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2006 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation and measurement of antennas, integrated antennas, and antenna bandwidth and radiation improvements. |
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| Proceedings of the Antenna Applications Symposium (30th) Held in Monticello, Illinois on 20-22 September, 2006. Volume 2 |
26 FEB 2007 |
267 pages |
| Authors:
Daniel Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| The Proceedings of the 2006 Antenna Applications Symposium is a collection of state-of-the art papers relating to antenna arrays, millimeter wave antennas, simulation and measurement of antennas, integrated antennas, and antenna bandwidth and radiation improvements. |
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| Formalizing Sensitivity in Static Analysis for Intrusion Detection |
2006 |
16 pages |
| Authors:
Henry H. Feng; Jonathon T. Giffin; Yong Huang; Somesh Jha; Wenke Lee; Barton P. Miller; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| A key function of a host-based intrusion detection system is to monitor program execution. Models constructed using static analysis have the highly desirable feature that they do not produce false alarms; however, they may still miss attacks. Prior work has shown a trade-off between efficiency and precision. In particular, the more accurate models based upon pushdown automata (PDA) are very inefficient to operate due to non-determinism in stack activity. In ... |
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| Infrastructure Vulnerability Assessment and Defense |
MAR 2005 |
27 pages |
| Authors:
Lixin Gao; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| The goal of this Infrastructure Vulnerability Assessment and Defense Project was to develop models for characterizing the worse-case scenarios for the Internet's routing infrastructure. In addition, sub-goals were to propose counter-measures to these vulnerabilities, implement, and experiment the proposed counter-measures, and evaluate their potential impact. |
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| High-Resolution S-band Profiling of the Atmospheric Boundary Layer |
04 NOV 2002 |
13 pages |
| Authors:
Stephen J. Frasier; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| An S-Band FMCW atmospheric radar was constructed, tested, and operated during the 1999 Cooperative Atmosphere Surface Exchange Study nocturnal boundary layer experiment (CASES-99). There the radar system provided real-time guidance to research aircraft and other sensors in locating gradients and turbulent layers. We participated in three subsequent CASES workshops and submitted a journal paper describing the instrument and initial CASES results. Finally, we have performed coordinated observations with the TEP ... |
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| Proceedings of the 2000 Antenna Applications Symposium. Volume 2 |
11 FEB 2002 |
164 pages |
| Authors:
Daniels H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2000 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF, and various other antennas. |
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| Proceedings of the 2000 Antenna Applications Symposium. Volume 1 |
11 FEB 2002 |
255 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 2000 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF, and various other antennas. |
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| Proceedings of the 2001 Antenna Applications Symposium. Volume 1 |
11 FEB 2002 |
243 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The proceedings of the 2001 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, Reconfigurable Antennas, Microstrip Antennas, Fractal Antennas. |
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| Proceedings of the 2001 Antenna Applications Symposium. Volume 2 |
11 FEB 2002 |
365 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The proceedings of the 2001 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, Reconfigurable Antennas, Microstrip Antennas, Fractal Antennas. |
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| Monte Carlo Simulation of InGaAs/InA1As HEMTs with a Quantum |
2002 |
7 pages |
| Authors:
Bo Wu; Ting-wei Tang; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In Monte Carlo simulation of high electron mobility transistors (HEMTs), how to position the source and drain contacts will significantly affect the drain current. Unlike many Monte Carlo (MC) simulations of HEM% in the past, in this work, the source and drain contacts are placed on the top of the caps as in the real device instead of on the side adjacent to the channel. In addition, to take quantum ... |
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| Application-Driven Reliability Measures and Evaluation Tool for Fault- Tolerant Real-Time Systems |
MAR 2001 |
209 pages |
| Authors:
C. M. Krishna; I. Koren; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The goals of this project were the development of performance measures suitable for use in real-time embedded systems. Developed a network measure to guide the designer in choosing an appropriate network topology. The measure combines graphic-theoretic concepts in evaluating the underlying reliability of the network and other means to evaluate the ability of the network to support interprocessor traffic. A second measure, called the computer measure, is meant to evaluated ... |
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| Active/Passive Remote Sensing of the Ocean Surface at Microwave Frequencies |
30 SEP 1999 |
16 pages |
| Authors:
Stephen J. Fraiser; R. E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report summarizes research activities and results obtained under grant N000l4-99-1-0627 "Active/Passive Remote Sensing of the Ocean Surface at Microwave Frequencies" for the period of performance April 13,1998 to April 12, 1999. This grant supported preliminary measurements of sea surface emission obtained with a Ka-band polarimetric radiometer in combination with Doppler radar measurements to characterize the surface wave field. Measurements were completed during April 1999 by the Microwave Remote Sensing ... |
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| Proceedings of the 1999 Antenna Applications Symposium Volume 1 |
SEP 1999 |
287 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1999 Antenna Applications Symposium is a collection of state-of-the-an papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
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| Proceedings of the 1999 Antenna Applications Symposium Volume 2 |
SEP 1999 |
267 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1999 Antenna Applications Symposium is a collection of state-of-the-an papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
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| Proceedings of the 1998 Antenna Applications Symposium |
APR 1999 |
356 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1998 Antenna Applications Symposium is a collection of state-of-the-art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas,HF, VHF, UHF and various other antennas. |
|
| Remote Sensing Turbulence in the Atmospheric Boundary Layer |
13 AUG 1998 |
16 pages |
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report summarizes MIRSL's activities under the Department of Defense University Research Initiative (URI) to develop a radar remote sensing system that is able to measure atmospheric turbulence for ABL studies, including the verification of LES results. This radar, called the Turbulent Eddy Profiler (TEP) is capable of imaging the structure of turbulence throughout a conical volume that extends from the ground to the top of the ABL. Preliminary field ... |
|
| Proceedings of the 1996 Antenna Applications Symposium |
OCT 1997 |
492 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The Proceedings of the 1996 Antenna Applications Symposium is a collection of state-of-the art papers relating to phased array antennas, multibeam antennas, satellite antennas, microstrip antennas, reflector antennas, HF, VHF, UHF and various other antennas. |
|
| Enabling Technologies for Real-Time Simulation |
AUG 97 |
105 pages |
| Authors:
Christos G. Cassandras; Wei-Bo Gong; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report summarizes the work performed for Enabling Technologies for Real-Time Simulation. The objective was to develop and study a three-pronged approach for turning simulation into an effective setting for C31 application areas. In particular, the report describes research into (1) concurrent simulation, for speeding up simulation experiments; (2) hierarchical simulation; and specifically, preserving statistical fidelity in hierarchical decomposition activities, and (3) using Neural Networks as a method to extract ... |
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| Adaptive Reconfiguration Algorithms for Real-Time Distributed Systems |
MAY 97 |
79 pages |
| Authors:
Aura Ganz; Weibo B. Gong; C. M. Krishna; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We have developed reconfiguration algorithms that are robust, impose little overhead, and are gracefully degradable and potent enough to extract large performance gains. In addition, we have developed techniques to collect system status information and designed rational approximate techniques to project algorithm performance. We have studied the performance of our reconfiguration algorithm in ring-based and optical networks. Our results promise substantial improvements in distributed real-time system performance without imposing a ... |
|
| A New Paradigm for Fast, Interactive Simulation |
MAR 97 |
136 pages |
| Authors:
Christos G. Cassandras; Wei-Bo Gong; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The objective of this effort has been to investigate and develop specific algorithms and demonstrations establishing the feasibility and value of novel techniques for (a) sensitivity estimation, (b) response surface generation, (c) parallel simulation, (d) ordinal optimization, and (e) interfaces in hierarchical simulation, to be used towards the creation of a fast, interactive simulation environment for C3I systems. Towards this objective, several specific tasks were performed intended to investigate new ... |
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| Characterization of Tapered Slot Arrays on Protuding Substrates |
08 MAR 96 |
8 pages |
| Authors:
Daniel H. Schaubert; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Endfire tapered slot antennas have demonstrated an unusual ability to perform well in wideband, wide-scan phased array antennas. Although these antennas have been in existence for 20 years and have been studied experimentally for most of that time, computational capabilities have only recently progressed to the point where numerical modeling of these antennas is feasible. This project was undertaken to investigate some of the fundamental parameters of tapered slot antenna ... |
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| Study of Focused Phased Array Imaging Radar (FOPAIR) Techniques |
22 JUN 95 |
7 pages |
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This AASERT grant provided graduate student support for one student, Stephen Frasier, working on the Focused Phased Array Imaging Radar (FOPAIR) program at the University of Massachusetts Microwave Remote Sensing Laboratory (MIRSL). During the reporting period, Steve conducted a number of field experiments to test and validate the radar system. These tests were held at Amherst, MA (UMass campus), N. Truro, MA (Cape Cod), La Jolla, CA (Scripps Institute of ... |
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| Discrete-Event-Dynamic-System-Based Approaches for Control in Integrated VoicelData Multihop Radio Networks |
07 DEC 94 |
34 pages |
| Authors:
Christos G. Cassandras; Vibhor Julka; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We report accomplishments and new directions in our effort to develop and apply discrete-event-dynamic-system-based techniques for the transmission scheduling problem in Radio Networks (RN). First, we examine this problem in the context of data traffic in general topology networks. Next, we look at the scheduling problem when processing packetized voice calls, where Grade-of-Service (GOS) requirements are quite different. For data traffic, we formulate an optimization problem for the allocation of ... |
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| Discrete-Event-Dynamic-System-Based Approaches for Control in Integrated Voice/Data Multihop Radio Networks |
07 DEC 94 |
34 pages |
| Authors:
Christos G. Cassandras; Vibhor Julka; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We report accomplishments and new directions in our effort to develop and apply discrete-event-dynamic-system-based techniques for the transmission scheduling problem in Radio Networks (RN). First, we examine this problem in the context of data traffic in general topology networks. Next, we look at the scheduling problem when processing packetized voice calls, where Grade of- Service (GOS) requirements are quite different. For data traffic, we formulate an optimization problem for the ... |
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| Discrete-Event-Dynamic-System-Based Approaches for Control in Integrated Voice/Data Multihop Radio Networks |
NOV 93 |
|
| Authors:
Christos G. Cassandras; Vibhor Julka; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report describes the progress made towards the effort to develop and apply new discrete-event-dynamic-system-based techniques for the transmission scheduling problem in Radio Networks (RN). The report is in two parts: in part one we examine the transmission scheduling problem in the context of (fixed length) data traffic. In contrast to our earlier work, performed under contract N000014-91-J-2025, which dealt with the broadcast scheduling problem in a fully connected packet ... |
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| Use of Microwave Polarimetry to Enhance SAR Images of the Ocean Surface |
SEP 93 |
5 pages |
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The investigation of coherent backscatter of microwave signals from the ocean surface to better understand the effects of surface motion on synthetic aperture radar images. The objective is to analyze the behavior of coherent electromagnetic backscatter from the ocean surface for a dual frequency dual polarization radar. Frequency and polarization diversity provides a picture of the mechanisms involved in the microwave backscatter. In this study, data was obtained from various ... |
|
| Use of Microwave Polarimetry to Enhance SAR Images of the Ocean Surface |
SEP 93 |
51 pages |
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The goals of this study is the investigation of coherent backscatter of microwave signals from the ocean surface to better understand the effects of surface motion on synthetic aperture radar images. The objective is to analyze the behavior of coherent electromagnetic backscatter from the ocean surface for a dual frequency dual polarization radar. Frequency and polarization diversity provides a picture of the mechanisms involved in the microwave backscatter. In this ... |
|
| Interinjection-Locked Quasioptical Power Combiners and Phased Arrays |
16 AUG 93 |
16 pages |
| Authors:
Karl D. Stephen; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Monolithic integration of microwave and millimeter-wave circuits means new techniques for using high-frequency devices in monolithic circuits must be developed. This report describes a series of several studies that address this need. A biasing technique for negative-resistance devices using a low-impedance lossy transmission line was found to be very useful in the design of planar oscillator circuits. This technique can be applied to monolithic circuits. Mutual impedance between elements in ... |
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| Applications of Spectral Microwave Radiometry to Sensing of Sea Ice and the Ocean Surface |
MAY 93 |
106 pages |
| Authors:
Karen M. St Germain; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The dielectric properties and emissivity of several types of sea ice were studied to improve upon the currently available algorithms for interpreting polar radiometric imagery from the SSM/I sensor. Laboratory studies indicated that the relative dielectric constant of new sea ice, as measured with a spectral C-Band radiometer, is approximately 12. This value represents the early stages of ice formation, and decreases rapidly with ice growth to approach the accepted ... |
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| Theoretical and Experimental Research on Coherent Microwave Backscatter From the Ocean |
93 |
6 pages |
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The development of frequency and polarization diverse radars to measure coherent backscatter of microwave signals from the ocean surface to better understand the effects of surface motion on synthetic aperture radar (SAR) images. |
|
| Mean Acquisition Time for Noncoherent PN Sequence Sequential Acquisition Schemes |
1993 |
7 pages |
| Authors:
Alex W. Lam; Sawasd Tantaratana; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Sequential PN code acquisition schemes have the potential to achieve the best performance, but they are the least analyzed because of the analytical difficulties. In recent studies, we have proposed and investigated the truncated sequential probability ratio test (TSPRT) for spread-spectrum noncoherent PN code acquisition. It was shown to be much better than the conventional fixed sample size (FSS) scheme in the average sample number (ASN) at fixed detection and ... |
|
| Fault-Tolerant Architectures for Multiprocessor and VLSI-Based Systems |
29 SEP 92 |
36 pages |
| Authors:
Dhiraj K. Pradhan; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The research investigated under this grant: (1) a virtual checkpointing scheme for (2) schemes for implementing reliable memory, (3) roll- forward recovery schemes-for duplex systems, (4) REACT, a tool for reliable architecture characterization and its application to reliability evaluation of TMR systems, (5) a new approach for low-cost system level diagnosis and (6) the reliability safety trade-off in modular redundant systems. |
|
| Optical Generation, Control and Sensing of Millimeter Waves |
JUL 92 |
|
| Authors:
Alfred P. Defonzo; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A novel optically excited, frequency invariant, coplanar stripline antenna that we developed is presented, A comprehensive full wave analysis of optically excited coplanar striplines developed by us is also briefly reviewed. The work confirms the earlier hypothesis regarding the existence of new mechanisms. The reported findings imply the existence of a deeper and more fundamental physics underlying the optical generation, sensing and control of electromagnetic radiation. An extensive bibliography is ... |
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| Test Equipment for Polarimetric Millimeter-Wave Research |
25 FEB 92 |
|
| Authors:
Robert E. McIntosh; Philip M. Langlois; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A summary of the equipment obtained with this grant is discussed. Test equipment, Network analyzer. |
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| Test Equipment for Polarimetric Millimeter-Wave Research |
25 FEB 92 |
|
| Authors:
Robert E. McIntosh; Philip M. Langlois; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A summary of the equipment obtained with this grant is discussed. Test Equipment, Network Analyzer. |
|
| Microstrip Antennas. |
JAN 1992 |
|
| Authors:
D. M. Pozar; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
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| Normalized Radar Cross Section of Natural Surfaces at Millimeter Wavelengths |
NOV 91 |
|
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report describes the results of research of polarimetric radar measurements performed at 95 GHz and 225 GHz by the University of Massachusetts. The targets included various tree species and snow scenes. |
|
| Normalized Radar Cross Section of Natural Surfaces at Millimeter Wavelengths |
NOV 91 |
|
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report describes the results of research of polarimetric radar measurements performed at 95 GHz and 225 GHz by the University of Massachusetts. The targets included various tree species and snow scenes. Polarimeter, millimeter-wave, Mueller matrix, Scattering matrix, Polarization, signature. |
|
| Modification of 95 GHz Radar Source Module for Low Phase Noise Operation |
NOV 91 |
|
| Authors:
Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This report describes the results of a modification to the University of Massachusetts 95 GHz polarimetric radar. This modification was done to reduce problems caused by phase noise originating from the radar's millimeter-wave oscillator. Phase Noise, Polarimeter, Millimeter-wave, Scattering matrix. |
|
| Fault Tolerant Architectures for Multiprocessors and VLSI-Based Systems |
29 SEP 91 |
30 pages |
| Authors:
Dhiraj K. Pradhan; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A general framework for shift register-based test response compressors was developed based on algebraic coding theory. It has advantages over Markov modeling in allowing exact computation of aliasing probability and extension to other forms of built-in self-test. The use of deBruijn graphs was adopted to studies of VLSI-based multiprocessor networks. These allowed derivation of lower bounds on VLSI layout areas and provided a method to meet those bounds. The graphs ... |
|
| Polarimetric Backscatter Measurements of Deciduous and Coniferous Trees at 225 GHz. |
JAN 1991 |
|
| Authors:
J. B. Mead; R. E. Mcintosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
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| A Study of Inter-Injection-Locked Phased Arrays |
10 OCT 89 |
|
| Authors:
Karl D. Stephan; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Progress in monolithic fabrication of microwave integrated circuits has led to reduced size and weight as well as improved performance of many microwave systems. At the shorter microwave and millimeter wavelengths, however, currently available solid-state devices often fail to deliver the required amount of power, so innovative power-combining schemes are still needed. A study of phased arrays driven by individual active solid-state devices has led to a number of interesting ... |
|
| Resource Contention Management in Parallel Systems |
APR 89 |
|
| Authors:
Christos G. Cassandras; James F. Kurose; Don Towsley; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research effort explored two issues: (1) The comparative study of simple load balancing algorithms for distributed real-time systems which showed that simple policies perform just as well as complex policies in a majority of the cases; (2) The second task was to development of on-line optimization procedures for load balancing algorithms and of task scheduling policies with real-time constraints. Keywords: Parallel processing, Multiprocessing. (kr) |
|
| Optimum Radiation of Short-Time Duration Signals |
15 DEC 88 |
|
| Authors:
Daniel H. Schaubert; David M. Pozar; Robert E. McIntosh; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research was conducted at the University of Massachusetts from 1 April 1985 through 30 September 1988 under the direction of Principal Investigator Daniel H. Schaubert and Co-Principal Investigators David M. Pozar and Robert E. McIntosh. The studies focused on the use of an analytical optimization technique in the frequency domain in order to maximize the signal strength or energy of a short-time-duration pulse that is radiated or received by ... |
|
| Picosecond Optoelectronic Transceivers |
88 |
|
| Authors:
Alfred P. Defonzo; Charles R. Lutz; Madhuri Jarwala; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| During the last year of the grant we began developing theoretical techniques for the analysis of the propagation and radiation properties of the device structures . These structures are comprised of a complanar stripline coupled to a exponential tapered stripline antenna. We initiated the development of two models. One model describes the dispersion of coplanar striplines over a wide range of dimensions and frequencies. The model is full wave analysis ... |
|
| Technology Development for Millimeter Wave Phased Arrays |
MAY 87 |
|
| Authors:
Daniel H. Schaubert; K. S. Yngvesson; David M. Pozar; Robert W. Jackson; MASSACHUSETTS UNIV AMHERST DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This project investigated architectures, radiators, FET amplifiers and oscillators that could be used in monolithic millimeter wave phased arrays. These investigations contribute to an understanding of the performance of integrated phased arrays. For example, scan blindness associated with surface waves and competition with active components for limited substrate surface area lead to designs with more than one substrate. It has been shown that feed lines can couple electromagnetically to microstrip ... |
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Reports by Corporate Author
