| Application of Wigner Distribution for the Detection of Accelerating Low-Altitude Aircraft using HF Surface-Wave Radar |
MAR 2002 |
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| Authors:
Thayananthan Thayaparan; Ambighairajah Yasotharan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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 | Real radar data has been analysed using the Fourier transform method and the type-III Wigner distribution. The results show that whenever the target was detectable by the Fourier transform method, the target was detectable also by the smoothed type-III Wigner distribution method. In the other trials the target was not detectable by the Fourier transform method but the target was detectable by the smoothed type-III Wigner distribution method to varying ... |
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| Radar ESM Track to Track Association |
DEC 2001 |
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| Authors:
Kaouthar Benameur; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| In this report, we present different approaches for the association of tracks for airborne sensors. The proposed approaches explore the effects of the choice of coordinate systems on the tracking filters and the association process. The performance of the association techniques is analyzed in terms of the probability of correct association (Pc) and the probability of false association (Pfa). This practical aspect of the multi-target multi-sensor tracking problem is presented ... |
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| Extended Kalman Filter Sensor Fusion Signals of Nonlinear Dynamic Systems |
DEC 2001 |
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| Authors:
Rahim Jassemi-Zargani; D. S. Necsulescu; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| World modeling for achieving operational space motion control of robot arms requires accurate measurements of positions and velocities in both joint and operational space. Servomotors used for joint actuation are normally equipped with position sensors and, optionally, with velocity sensors for interlink motion measurements. Further improvements in measurement accuracy can be obtained by equipping the robot arm with accelerometers for absolute acceleration measurement. In this report an Extended Kalman Filter ... |
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| Data Fusion and Sensor Management |
DEC 2001 |
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| Authors:
Kaouthar Benameur; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report addresses the problem of data fusion and sensor management based on a synergistic use of the information provided by multiple sensors. In the first studied case, we deal with the problem of measurement strategy computation for a passive receiver. The basic problem is then to compute an optimal policy, during a specified observation time interval so that a prediction accuracy is optimized. It is shown that the optimal ... |
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| D-SAFIRE: A Distributed Simulation |
DEC 2001 |
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| Authors:
Gary Geling; Craig Williams; Myriam Guirguis; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Defence Research and Development Canada (DRDC) has been developing a low cost means to evaluate the integration of new display equipment for the Air Force. The result has been the Aircraft Crewstation Demonstrator (ACD), which is capable of simulating the cockpit of an aircraft for human factors evaluation (HFE). In order to support future display upgrades within the cockpit of the CF- 18, DRDC contracted an HFE study of the ... |
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| Automatic Target Recognition Using HNeT: An Investigation of Holographic/Quantum Neural Technology |
DEC 2001 |
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| Authors:
Ryan A. English; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| With the release of the Moving and Stationary Target Acquisition and Recognition (MSTAR) public data set, high quality Synthetic Aperture Radar (SAR) imagery of military ground vehicles has been made accessible to the entire research community. Furthermore, standard methods for evaluating classifier results on this data set have been created and released. Using these tools, we reconsider a previously contracted application of AND Corporation's Holographic/ Quantum Neural Technology (HNeT) classifier, ... |
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| A Calibration Procedure for an HFSWR Receive Array |
DEC 2001 |
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| Authors:
Eric K. Hung; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report contains a description and performance evaluation of the matrix calibration method developed by the author in 1995 for the receive antenna array in the high frequency surface wave radar (HFSWR) at Cape Race, Newfoundland. The evaluation compares this method with two other methods: (a) the phase-only calibration method being used, and (b) an assumed gain-and-phase method that equalizes the complex element output amplitudes of signals in the boresight ... |
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| Stress Synergy in Proton Induced Single Event Effects in SRAM |
NOV 2001 |
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| Authors:
L. S. Erhardt; T. Cousins; D. Estan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| A study was conducted to determine the effect of prior exposure to radiation on the proton-induced single event effect (SEE) cross section for SRAM devices. This was done in order to determine whether or not proton testing of virgin parts accurately determines the likely rate of single event effects for these parts in a space environment. Two types of SRAM parts were exposed to various doses of gamma radiation and ... |
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| Chaotic Sea Clutter Returns. Current Status and Application to Airborne Radar Systems |
NOV 2001 |
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| Authors:
Michael K. McDonald; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The potential to model sea clutter radar returns using chaos theory is examined. Chaotic systems display qualitative similarities to sea clutter returns such as broad flat spectrums, boundedness and irregular temporal behaviour. In this report several key parameters of chaotic systems, namely correlation dimension, Lyapunov spectrum and Lyapunov dimension are calculated from real sea clutter returns and found to be consistent with a chaotic interpretation. The airborne high resolution data ... |
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| A Novel Method for Statistical Comparison of Geophysical Data by Multiple Instruments which have Differing Accuracies |
NOV 2001 |
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| Authors:
T. Thayaparan; W. K. Hocking; S. J. Franke; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| A novel correlative technique is introduced for comparison of measurements of similar quantities made using different techniques. This process involves a generalized least-squares fitting method which can be used to estimate the slope of the best-fitting straight line that results when two separate data sets that are expected to be linearly correlated are compared via scatter-plots. The different data types may be subject to different uncertainties in their measurements. The ... |
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| A Novel Approach for the Wigner Distribution Formulation of the Optimum Detection Problem for a Discrete-Time Chirp Signal |
NOV 2001 |
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| Authors:
Thayananthan Thayaparan; Ambighairajah Yasotharan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The Wigner distribution is a signal transformation which has its origin in quantum mechanics. It possesses some important properties which make it very attractive for time-frequency signal analysis. The Wigner distribution was originally defined for continuous-time signals. A discrete-time version of it was proposed recently. Unfortunately, this discrete-time Wigner distribution suffers from aliasing effects, which prevent several of the properties of the continuous-time Wigner distribution from carrying over straightforwardly. In ... |
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| Contaminated Vehicle Protection Factors for the CF Grizzly |
NOV 2001 |
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| Authors:
Dean S. Haslip; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Measurements of dose rates at 10 locations inside a radiologically contaminated CF Grizzly Light Armoured Vehicle were made at a French army facility. This permits calculation of the radiation protection factors for the locations inside the vehicle. The contaminated vehicle protection factors varied between 3.3 and 6.9, depending on position within the vehicle, averaging 5.7. These values are consistent with previous measurements made at DREO. These results were also used ... |
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| Reconfigurable Digital IIR and FIR Filters |
NOV 2001 |
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| Authors:
B. Gosselin; C. Wilcox; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The work presented in this document contributes to the ROBR (reconfigurable Omni Band Radio) project started by the Defence Research Establishment Ottawa and the Communication Research Centre in 1997. ROBR is a testhed implementation of a reconfigurable satellite communications (satcom) terminal that makes use of a software communications architecture. Such a system can enable the use of a single ground terminal to communicate over multiple satellite communications or terrestrial links ... |
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| DREA-Developed Approach to Computer Simulation of ESD (Electrostatic Charging/Discharging) in Space Systems |
NOV 2001 |
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| Authors:
L. Varga; E. Horvath; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Space radiation has deleterious effects on satellite electronic components and systems. To be able to predict the likely radiation scenario for a given orbit and space platform, DREO has developed a modeling tool that simulates radiation effects such as electrostatic charging/discharging (ESD) and dose deposition into complex targets. The codes used by the model are described in considerable detail. The most important code is the Monte Carlo radiation transport code ... |
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| Channel Availability for East Coast High Frequency Surface Wave Radar Systems |
NOV 2001 |
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| Authors:
Hank W. Leong; Barry Dawe; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| In support of the operation of the east coast High Frequency surface wave radar (HFSWR) systems, we carried out a continuous measurement of noise and interference data in the frequency band of 3-6 MHz at Cape Race, Newfoundland in the period between August 1, 1998 and May 10, 2000. In 3, we presented an estimation of noise factors from the measured data. In this report, we study the channel availability, ... |
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| Global Shoreline Mapping from an Airborne Polarimetric SAR: Assessment for RADARSAT 2 Polarimetric Modes |
NOV 2001 |
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| Authors:
Maureen L. Yeremy; Andre Beaudoin; Jonathan D. Beaudoin; Gillian M. Walter; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| A project between two agencies, DREO and NIMA was initiated in 1998 to study shoreline extraction from imagery. DREO researched SAR applications with an emphasis on Radarsat products. The focus of this report is the extraction of shorelines from polarimetric SAR imagery in preparation for the launch of Radarsat 2. The desired vector shoreline product for this project is the Mean High Water Line (MHWL). This specification implies that consideration ... |
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| Analysis of the Small Sample Size Performance of Fast Fully Adaptve STAP Techniques for MTI Radar |
OCT 2001 |
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| Authors:
Christoph H. Gierull; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| In ground surveillance from an airborne or space-based radar it is desirable to be able to detect small moving targets, such as tanks or wheeled vehicles, within severe ground clutter. For operational moving target indication (MTI) systems the clutter filter coefficients have to be updated frequently due to rapidly changing interference environment. This report examines the small sample size performance of different fast fully adaptive space-time processors (STAP) and compares ... |
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| Comparison of Radiation Response of LiF:MgCuP and A12O3:C thermoluminescent Dosimeters |
OCT 2001 |
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| Authors:
L. S. Erhardt; L. Prud'homme-Lalonde; T. Cousins; D. Estan; B. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| A study was conducted comparing the properties of two types of thermoluminescent dosimeters (TLDs): LiF:MgCuP (TLD-100H) and Al2O3:C (TLD-500). This was done in order to determine which is better suited for the dosimetry requirements of the Radiation Effects Group at DREO (RE/DREO). The dose and energy response of the TLDs were measured by exposing them to a wide range of photon doses and energies. In addition, the sensitivity of the ... |
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| The Convair 580 Along-Track INSAR Processor: Documentation, Guide and History |
AUG 2001 |
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| Authors:
Ishuwa Sikaneta; John Campbell; Mike Robson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This document summarizes the work done on the along-track interferometric SAR processor loaned to Defence Research Establishment Ottawa (DREO) by the Canada Centre for Remote Sensing (CCRS). It outlines the problems encountered with getting the software to work properly, as well as the enhancements that were made to the code. It provides a guide to setting up and using the processor. It details the changes in structure made to the ... |
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| Efficacy of Radiological Decontamination |
AUG 2001 |
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| Authors:
Dean S. Haslip; Tom Cousins; B. E. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Trials of various decontamination methods and materials were carried out by DREO personnel at a French army facility. This was done to validate these materials and techniques for use with radioactive materials. Exterior and interior radiation detectors were used to monitor the progress of the decontamination. It was shown that the Irvin Aerospace CASCAD (CUE 2000) foam was only 59% effective in removing the radioactive contamination in the first attempt, ... |
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| Statistics of SAR Interferograms with Application to Moving Target Detection |
JUL 2001 |
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| Authors:
Christoph H. Gierull; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report examines the statistics of the phase and magnitude of SAR interferograms towards the deployment of along-track interferometry (ATI) for slow ground moving target indication (GMTI). Great importance is attached to the practical applicability of the derived theoretical results, particularly with regard to the experimental MTI-mode of Radarsat2. Therefore, the results are evaluated with experimental airborne SAR data acquired during flight trials conducted in Petawawa in 1999. While the ... |
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| Health Effects of Uranium Exposure |
22 JUN 2001 |
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| Authors:
Robert Z. Stodilka; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This manuscript summarises the risks associated with uranium exposure. Experimental data is available from genetics, tissue culture, and animal and human models. Studies include solubility of different uranium compounds, kinetic properties inside the body, and short- and long-term health effects both from acute and chronic exposures. The potential for uranium entry into the body is highly dependent upon its chemical and physical properties. Inhalation and dermal contact afford the most ... |
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| Migration of DIINS to PowerPC/VxWorks and Intel/Win32 |
JUN 2001 |
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| Authors:
J. S. Bird; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report documents the results of work required to migrate the DIINS (Dual Inertial Integrated Navigation System) software from its former platform, consisting of a unix-based Sparc host system and Motorola 68030 VME target system under a Telesoft Ada83 compiler and run-time executive, to a new Green Hills Ada95 NT development environment and two new run-time platforms: a PowerPC604 VME target system running VxWorks 5.4, and a generic personal computer ... |
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| Radiological Air Sampling for the Canadian Forces |
JUN 2001 |
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| Authors:
Dean S. Haslip; Diego Estan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| DREO has performed a study of air sampling methodologies and methods of data analysis following air sampling. This has been done in support of Project 00002199 (Radiation Detection, Identification, and Dosimetry) and is focussed on what methods would be best suited to the Canadian Forces. As part of this work, DREO performed a number of experimental trials to demonstrate and test the principles and methods of air sampling. A suggested ... |
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| Military Voice Services over Wireless ATM Networks: Performance Analysis of FEC Schemes at ATM Transport Over Wireless Links |
MAR 2001 |
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| Authors:
Sophia Tsakiridou; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Wireless ATM was designed to extend the support of broadband, multimedia services provided in fixed ATM networks to the wireless/mobile environment in a seamless and efficient manner. It is a candidate wireless networking technology for future tactical military networks which have adopted ATM in the core network. The bandwidth-limited, error-prone nature of wireless links poses significant challenges in the design of wireless ATM. This report is part of a study ... |
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| Military Voice Services over Wireless ATM Networks: ATM Adaptation Layer Study |
MAR 2001 |
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| Authors:
Luis Villasenor-Gonzalez; Louise Lamont; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| ATM technology has enjoyed great success, due in great part, for its ability to support a whole range of applications with Quality of Service (QoS) guarantees. Consequently, ATM has become of great interest for the support of services over military telecommunications networks. This report is provided as part of a study on the feasibility of military voice services over wireless ATM networks. In this study we are concerned with the ... |
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| Digital Sampling Rate Conversion: Principles and Implementation |
FEB 2001 |
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| Authors:
Sichun Wang; Brian Kozminchuk; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The resampling of a signal involves the conversion from the initial sampling rate to a new and different one. This is often necessary in practical applications because the sampling rate is often fixed while the desired sampling rate may depend on the application or a signal parameter, such as the symbol rate or channel spacing. This problem often arises in software radios systems where the sampling rate is determined by ... |
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| Shoreline Mapping Using Interferometric SAR |
2001 |
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| Authors:
Karim E. Mattar; Max Buchheit; Andre Beaudoin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Coherence from repeat-pass Satellite Radar Interferometry (SRI) is explored as a means for shoreline mapping and water body masking. In temperate environments the coast may be outlined by the difference between the high coherence of the land and the absence of coherence in the sea/ocean. However, it is found that in coastal regions scene decorrelation from a variety of sources often dominate the image, making it difficult or impossible to ... |
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| Overview of Experimental Pulse-Doppler Radar Data Collected Oct 1999 |
DEC 2000 |
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| Authors:
Steven J. Hughes; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The Defence Research Establishment Ottawa has designed and constructed an experimental air-to-air radar system as the first step in demonstrating an air-to-air surveillance capability for the Canadian Forces' CP- 140 Maritime Patrol Aircraft. initial flight trials of the experimental radar system were conducted in October 1999. The resulting data set includes measurements of ground clutter, water clutter, urban clutter, and returns from targets of opportunity. These data will be used ... |
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| Mapping Ground-Level Radiation Fields with DREO's Airborne Gamma-Ray Spectrometer |
DEC 2000 |
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| Authors:
D. S. Haslip; T. Cousins; T. A. Cousins; T. A. Jones; Ph. Bouteilloux; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| An algorithm is developed and tested that infers a ground contamination pattern from the dose rate patterns measured by DREO's Airborne Gamma-ray Spectrometer. This algorithm is based on a least-squares minimization, and uses Micro shield calculations of dose rates as a function of altitude over a patch of contaminated ground. The algorithm is successful in that it correctly identifies regions of high and low contamination, which would permit a commander ... |
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| An Analysis of RADARSAT2 SAR-GMTI Performance for Standard Beam Mode |
DEC 2000 |
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| Authors:
Shan Chiu; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Canada's RADARSAT2 (R2) commercial SAR satellite will have an experimental operating mode that will allow ground moving target indication (GMTI) measurements to he made with received data. This mode is also called MODEX (Moving Object Detection Experiment). In the GMTI or MODEX mode of operation, the spacecraft's radar antenna is partitioned into two apertures that sequentially observe the scene of interest from the same points in space. Data is simultaneously ... |
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| In-Situ Calibration of an X-Band Antenna Array for Low-Angle Tracking with High-Resolution Direction-Finding Methods |
NOV 2000 |
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| Authors:
Eric K. Hung; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| Presented in this report is an in-situ method to calibrate X-band antenna arrays designed to detect and track low-level missiles over water. These arrays are indispensable in ship defence, because they can operate in rainy and foggy conditions where atmospheric absorption is too high for the use of more accurate millimetre wave radars or optical devices. The method uses a set of array snapshots to construct a calibration matrix for ... |
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| A Spatial Power Spectrum Estimator for Distributed Signals |
NOV 2000 |
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| Authors:
W. J. Read; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report details the development of an N-channel spatial power spectrum estimation technique called the SPatial Incoherent Region Estimator (SPIRE). It was developed in support of research aimed at characterizing the spatial spreading of HF signals caused by the high latitude propagation environment with the ultimate goal of improving high latitude HF radio direction finding performance. Based on the assumption of temporal and spatial incoherence, SPIRE uses a surprisingly simple, ... |
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| Analysis of the Radiation Environment Effects on Electronic Components in Near-Earth Orbits |
NOV 2000 |
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| Authors:
L. Varga; E. B. Horvath; T. Cousins; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The radiation environments at two low altitude orbits have been calculated with the NASA space environment models and codes AP8/AE8, Vette, and CREME. LET spectra and device upset rates for various solar activity scenarios have been determined. Dose deposition into silicon targets as a function of Aluminum shielding thickness has been also calculated with a Monte Carlo code. The results indicate that parameters such as orbit altitude, shielding thickness, and ... |
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| Linear and Quadratic Time-Frequency Representations |
NOV 2000 |
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| Authors:
Thayananthan Thayaparan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| This report is reviewing both linear and quadratic time-frequency representations. The linear representations discussed are Short-Time Fourier Transform and S-transform. The quadratic representation discussed is Wigner distribution. We outline the motivations, interpretations, mathematical fundamentals, properties, and applications of these linear and quadratic time- frequency representations. We also compare these three different time-frequency analysis techniques and show that each technique has its strengths and drawbacks. The simulated data sets have been ... |
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| Noise Measurements at Cape Race in Support of East Coast High Frequency Surface Wave Radar |
NOV 2000 |
|
| Authors:
Hank W. Leong; Barry Dawe; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| In support of the operation of the east coast High Frequency surface wave radar (HFSWR) systems, a continuous measurement of noise and interference data in the frequency band of 3-6 MHz was carried out at Cape Race, Newfoundland between August 1, 1998 and May 10, 2000. A procedure called the 'minimum of median' was developed to estimate the noise factors from the measured data. The results of the estimation are ... |
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| Limitations and Strengths of the Fourier Transform Method to Detect Accelerating Targets |
NOV 2000 |
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| Authors:
Thayananthan Thayaparan; Ambighairajah Yasotharan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| There are limitations and shortcomings to the Fourier transform method to detect accelerating targets because of the phenomenon known as Doppler smearing. In using a Pulse Doppler Radar to detect a non-accelerating target in additive white Gaussian noise and to estimate its radial velocity, the Fourier method provides an output signal-to-noise ratio (SNR) that increases linearly with the number of pulses. When the target is accelerating, the Fourier method may ... |
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| QWIP-LED/CCD Coupling Study |
NOV 2000 |
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| Authors:
Shan Chiu; Al Scott; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Many space-based imaging applications demand a sensitive, low noise long wavelength IR detector which is able to image a wide field of view in a short time. Quantum Well Infrared Photodetector (QWIP)-LED detectors offer the potential for large imaging area, and ultra-low noise operation when cooled to cryogenic temperatures (approx. 30K). Due to these factors the QWIP-LED holds a significant advantage over conventional detectors. It is in the area of ... |
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| Graphical Investigation of Quantisation Effects of Phase Shifters on Array Patterns |
NOV 2000 |
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| Authors:
Michel Clenet; Gilbert Morin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This document presents graphical investigations of the array factor of phased arrays with digital phase shifters. A software program based on basic antenna array theory has been developed in Matlab to obtain the main array characteristics (array factor and directivity). The array factors of linear arrays of different sizes with different types of phase shifters have been studied as a function of the number of bits and the frequency. Unconventional ... |
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| Performance of RADARSAT2 SAR-GMTI Processors at High SAR Resolutions |
NOV 2000 |
|
| Authors:
Shen Chiu; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Canada' 5 RADARSAT2 commercial Synthetic Aperture Radar (SAR) satellite, scheduled to be launched in Spring 2003, will have an experimental operating mode that will permit Ground Moving Target Indication (GMTI) measurements to be made with received data. In this mode of operation, the radar antenna is partitioned into two sub-apertures that sequentially observe the scene of interest from the same points in space. Two GMTI processing approaches are currently being ... |
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| Enhancing TCP Performance Over Satellite Channels |
NOV 2000 |
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| Authors:
Maik Kammermann; Hugues Latour; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| In general the Transmission Control Protocol (TCP) works well while establishing end-to-end connections for common Internet services. However, there are two problem areas associated with performance over satellite channels: propagation delay and channel noise effects. Noise is a common problem in wireless technologies and consequently the bit-error-rate (BER) is significantly higher than in wired networks. TCP is particularly vulnerable to BER because it is a reliable protocol. TCP will retransmit ... |
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| Distributed Network Management |
OCT 2000 |
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| Authors:
David Kidston; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report begins with an introduction of network management and an outline of the problems facing the existing management systems for enterprise networks. Commercial and defence related issues in effective management of the next generation of application traffic are also discussed. The following four main requirements for effective network management are extracted; management must be scalable, adaptable, useful, and collaborative. Scalability is required to handle the increasingly large sizes of ... |
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| Digital Automatic Gain Control (DAGC) for Surveillance Radar Applications: Theory and Simulation |
OCT 2000 |
|
| Authors:
Michael K. McDonald; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The potential for using a digital automatic gain control (DAGC) is examined. The DAGC operates by digitally storing a clutter map of the average of past returns. This average clutter map is digitally filtered to remove small spatial variations and the resulting values are used to adjust the front end receiver gain. In contrast a traditional analog automatic gain control (AAGC) uses real time filtered feedback to control the adjustable ... |
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| Field Detection of Depleted Uranium Final Report of Tasking W28476KR00Z (DSSPM) |
JUN 2000 |
|
| Authors:
Dean S. Haslip; Tom Cousins; Diego Estan; Trevor A. Jones; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| At the request of Defence Services Procurement Project 00002199, DREO has undertaken a study to examine the capabilities of commercial radiation detection equipment for the detection of depleted uranium (DU) on the battlefield. This work is intended to guide doctrine development for procedures to be followed where DU use or contamination is suspected. This work involved some spectroscopic studies of DU munitions, and detection trials ... |
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| Testing of the Siemens EPD MK2 Final Report of Tasking W28476KROOX (DSSPM) |
APR 2000 |
|
| Authors:
Dean S. Haslip; Tom Cousins; Diego Estan; Jean- Roch Brisson; Bernbard E. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Defense Services Procurement Project 00002199 tasked DREO to test the new Siemens EPD Mk2 (an electronic personal dosimeter) at DREO's various irradiation facilities. The dependence of the response on dose rate, energy, and temperature were all studied. This dosimeter was found to be comparable to the DMC 2000S electronic dosimeter produced by Merlin-Guerin Products (MGP), although each has some particular advantages over the other. This dosimeter is ... |
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| Further Examination of Iridium Satellite Phone and Pager System for Military Use |
JAN 2000 |
|
| Authors:
Caroline Tom; James D. Lambert; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Iridium satellite-based personal communications system (PCS) has been offering voice and messaging services since November 1998 and March 1999 respectively. With its interconnected constellation of 66 low earth orbit (LEO) satellites, Iridium is capable of providing continuous communications anywhere in the world. This Technical Memorandum describes further evaluations of the Iridium system carried out by the Military Satellite Communications group at Defence Research Establishment Ottawa (DREO). Evaluations include additional ... |
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| An Investigation in Interference Suppression for HF Surface Wave Radar |
DEC 1999 |
|
| Authors:
Hing C. Chan; Eric K. Hung; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| An evaluation of the performance of the coherent sidelobe cancellation (CSLC) techniques in suppressing nighttime co-channel communications interference and ionospheric clutter in HF surface wave radars operating in coastal regions was carried out. In particular, the optimum order of execution among the three signal processing functions: (1) Doppler processing, (2) digital beamforming and (3) interference cancellation was of interest, in terms of ... |
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| A New Remote-Sensing Method for Mine Detection using HPM Irradiation andIR Detection |
DEC 1999 |
|
| Authors:
S. M. Khanna; F. Paquet; R. Apps; J. S. Seregelyi; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A remote-sensing method based on active high-power microwave (HPM) illumination and detection in the infrared (IR) region is described for the detection of shallow buried landmines. This method is based on different interactions of the incident HPM radiation with the mine and the surrounding soil which occur due to a difference in their complex dielectric constants. This leads to the development of a thermal signature of ... |
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| Airborne Surveillance Concepts Post 2010 |
DEC 1999 |
|
| Authors:
Steven J. Hughes; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Airborne Surveillance Concepts 2010 project is sponsored by the Director, Science and Technology Air, and supported by the Thrust Leader, Airborne Surveillance. The purpose of the project is to propose advanced surveillance concepts to contribute to Air Force operations after the year 2010. The aim of the project is to anticipate the availability of future technologies to support long-term planning by the Canadian Forces, to ... |
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| Mitigation of Transient Doppler Artifacts In Airborne Pulse Doppler Radar |
DEC 1999 |
|
| Authors:
Steven J. Hughes; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| The Defence Research Establishment Ottawa has developed a Digital Radar Receiver and Data Acquisition System as part of an experimental air-to-air surveillance radar that will be used to demonstrate an air-to-air surveillance capability for the Canadian Forces CP-140 Maritime Patrol Aircraft. The report presents an analysis of the radar return signal expected from a point target, and predicts the existence of transient Doppler artifacts associated with ... |
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