| Comparison of Proton, Neutron and Electron Radiation-Induced Electron Traps in N-GaAs Epilayers Studied by Deep Level Transient Spectroscopy |
DEC 1999 |
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| Authors:
S. M. Khanna; G. H. Yousefi; J. B. Webb; Z. Wasilewski; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
 | This paper compares the deep level transient spectroscopy (DLTS) study of proton radiation-induced defects in molecular beam epitaxy (MBE) n-GaAs with the defects generated in n-GaAs by high energy electron and neutron radiation. For proton irradiation, it was found that the density of radiation- induced traps increased with radiation fluence. The activation energies, capture cross sections and trap densities with respect to radiation fluence are reported. ... |
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| DIINS - The Next Generation CPF Navigation System - An Overview |
NOV 1999 |
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| Authors:
J. S. Bird; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Canadian Navy has been developing a highly fault tolerant, integrated navigation system for its dual INS equipped frigates for a number of years. The system, called DIINS (Dual Inertial Integrated Navigation System), is now in the final stages of sea trials before being prepared for installation on the vessels. This report provides a high level overview of the system. |
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| Buy & Try Testing of MGP DMC 2000S and NRC UDR-13A Dosimeters |
NOV 1999 |
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| Authors:
Dean S. Haslip; Tom Cousins; Diego Estan; Trevor A. Jones; Bernie E. Hoffarth; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The MGP DMC 20008 and the NRC UDR-13A electronic dosimeters have been tested by DREO for acquisition project G2199 "Nuclear Detection, Identification and Dosimetry". These tests were carried out with the wide array of radioactive sources available at DREO, with the X-ray facility available at the National Research Council, and with one of the environmental chambers available at the Quality Engineering Test Establishment (QETE). Both meters ... |
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| Multi-Spectral QWIP-LED Devices: A Feasibility Study |
OCT 1999 |
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| Authors:
S. Chiu; H. C. Liu; E. Dupont; M. Buchanan; C. Y. Song; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The recent advances in infrared sensing technology has made it possible to use infrared sensors to support environmental observations, surveillance, threat detection, tracking, and target identification. For space- based ballistic missile defense (BMD) related applications, the most important detector requirements are: high sensitivity, high uniformity, large format, and multicolor capabilities. Quantum well infrared photodetectors (QWIPs) are a relatively new candidate technology for BMD applications. ... |
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| Development of a Portable High-Frequency Radar |
OCT 1999 |
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| Authors:
Harold Wilson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Surface Radar Section of DREO is developing a portable HF radar. The report presents an overview of the radar and analysis of a series of tests done in 1998. The equipment including antennas and electronics is described. A series of electronics problems was encountered, but none of them have a significant effect on the operation of the system. The receiver system was calibrated using ... |
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| DREO Secure Video Conferencing and High Speed Data Encryption Tests for Inmarsat-B Satellite Terminals |
OCT 1999 |
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| Authors:
James D. Lambert; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The aim of this report is to describe the results of a series of tests performed between 1996 and 1999 using lnmarsat-B satellite terminals. These tests were designed to evaluate the use of Commercial-Off-The-Shelf (COTS) equipment in demonstrating low-rate, secure video conferencing, multiplexed voice and data circuits, and LAN extension services via the Inmarsat-B 64 kb/s High Speed Data (HSD) service. Successful demonstrations of both secure ... |
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| Prediction of Radiological Hazard Areas with HPAC |
OCT 1999 |
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| Authors:
D. S. Haslip; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The dispersal of radioactive materials in a number of military scenarios has been modelled computationally. This work is part of an international intercomparison of computational capabilities under the auspices of Action Group 44 of The Technical Co-operation Program. The results presented herein were obtained with the Hazard Prediction and Assessment Capability (HPAC) , designed by the U.S. Defense Threat Reduction Agency (DTRA). This sophisticated ... |
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| An Evaluation of the Watson-Watt And Butler Matrix Approaches For Direction Finding |
SEP 1999 |
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| Authors:
William J. Read; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| In this report, an evaluation of the Watson-Watt and Butler matrix approaches for tactical wideband radio direction finding applications is described. This evaluation was carried out using theoretical derivations and computer simulations, concentrating on the effects of various error mechanisms including internal noise, terrestrial and isotropic noise, cochannel interference, and multipath. A maximum likelihood (ML) approach was also derived and evaluated for comparative purposes to ... |
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| Evaluation of Iridium Satellite Phone Voice Services for Military Applications |
SEP 1999 |
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| Authors:
Caroline Tom; Lyle C. Wagner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Iridium system is designed to provide global personal communications via an interconnected constellation of Low Earth Orbit (LEO) satellites communicating directly with handheld terminals. The system provides communications to all parts of the globe, including the polar regions. This document describes the DREO evaluation of the Iridium voice service under a number of different scenarios. Also included is an overview of the general ... |
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| Evaluation of Iridium Paging Services For Military Applications |
AUG 1999 |
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| Authors:
Caroline Tom; Lyle C. Wagner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Iridium is the first satellite-based personal communications system offering global service via an interconnected constellation of low earth orbit (LEO) satellites communicating directly with handheld terminals. The total constellation of satellites was launched over a 12-month period ending May 1998. Voice service commenced in November 1998 followed by paging services in March 1999. This Technical Memorandum describes an evaluation of the Iridium paging service carried ... |
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| On the Application of the Parks-McClellan Algorithm to the Design of Quadrature Demodulation Filters |
JUN 1999 |
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| Authors:
R. Inkol; D. P. Nguyen; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| New results are presented concerning the use of the Parks-McClellan algorithm to design filters for digital quadrature demodulators based on quadrature mixing and lowpass filtering concepts. The use of a 4:1 ratio between the sampling rate and intermediate frequency to reduce computational cost complicates this problem. Since the in-phase (I) and quadrature (Q) filters become odd and even length filters, respectively, the matching of the passband gains becomes an important ... |
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| A Maximum Likelihood HF Direction Finding Estimator for High Latitude Distributed Signals |
APR 1999 |
|
| Authors:
William J. Read; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report details the development and evaluation of a new direction finding estimator, the Spread Maximum Likelihood algorithm, targeted for high latitude HF propagation conditions. Of particular concern are patches of enhanced electronic density and associated instabilities in the ionosphere which drift across the polar cap during darkness causing scattering of the propagated signal over a range of azimuth and elevation directions (i.e., the signals are ... |
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| Requirements of Radiation Detection, Identification, and Dosimetry Equipment for the Canadian Forces |
APR 1999 |
|
| Authors:
D. S. Haslip; T. Cousins; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Technical Descriptions have been developed for equipment to be procured under Defense Services Procurement Project G2199 Nuclear Detection, Identification and Dosimetry. These descriptions have been developed from NATO requirements, industry research, analysis of previous DREO tests, and extensive consultations with the project's operational sponsor in the Directorate of Nuclear, Biological, and Chemical Defense (DNBCD). |
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| Bundling Internet Traffic Over VBR ATM Networks. Canada - Germany Research Activity |
DEC 1998 |
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| Authors:
Louise Lamont; Luis Villasenor; Nawel Chefai; Ilka Miloucheva; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| An initiative between DeTeBerkom in Berlin and the Communication Research Centre (CRC) in Ottawa was undertaken to determine realistic resource reservation requirements when IP telephony applications are multiplexed with bulk data applications in an ATM network. In our work, we considered different ways of bundling voice (i.e., IP telephony) and data traffic. We analyse the throughput achieved for the data traffic and the rate, packet loss and delay variance for ... |
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| Image Smearing in a Quantum Well Infrared Photodetector Monolithically Integrated With a Light Emitting Diode |
DEC 1998 |
|
| Authors:
Shen Chiu; Emmanuel Dupont; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The recent advances in infrared sensing technology has made it possible to use infrared sensors to support environmental observations, surveillance, threat detection, tracking, and target identification. For ballistic missile defence (BMD) related applications, the most important detector requirements are: high sensitivity, high uniformity, large format, and multicolor capabilities. Quantum well infrared photodetector (QWIP) is a relatively new candidate technology for BMD applications. It has become one of the most promising ... |
|
| Detection and Tracking of Low-Altitude Aircraft Using HF Surface-Wave Radar |
DEC 1998 |
|
| Authors:
Hing C. Chan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A series of aircraft-detection trials was conducted using experimental high frequency surface wave radar (HFSWR) facilities located on the east coast of Canada. These trials were part of a research and development project undertaken by DND to demonstrate the HFSWR technology in a wide-area coastal surveillance role. Several aircraft were used in these trials, including a Beechcraft King-Air 200, a Lockheed T-33 and a Canadair Challenger 601 aircraft. Experimental results ... |
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| Gain Measurement of a Cavity-Backed Spiral Antenna from 4 to 18 GHz Using the Three-Antenna Method |
NOV 1998 |
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| Authors:
Claude J. Brochu; Gilbert A. Morin; John W. Moffat; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report presents the results of the measurement of the maximum gain of a cavity-backed spiral antenna in the frequency range of 4-18 GHz. This measurement activity was requested by CFEWC. The method selected for this measurement was the three-antenna method for antenna gain measurements. As the antenna-under-test (AUT) is a circularly polarized (CP) antenna, the method was extended to obtain the CP co-pol and cross-pol gain of the AUT. ... |
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| Ground Terminal Simulator Implementation for Uplink Synchronization Trials |
NOV 1998 |
|
| Authors:
Caroline Tom; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A ground terminal (GT) simulator was developed at Defence Research Establishment Ottawa (DREO) as part of an in-house activity examining aspects of uplink synchronization for extremely high frequency (EHF) satellite communications (SATCOM) using frequency bopping. The GT simulator consists of a GT processor, custom interface boards, synthesizer controller, frequency synthesizer, and data source. The GT processor is the principal component of the simulator and is realized by a TMS320C30 digital ... |
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| Adaptive Suppression of Interference in HF Surface Wave Radar Using Auxiliary Horizontal Dipole Antennas |
SEP 1998 |
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| Authors:
Hank W. Leong; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report presents the results of a study to evaluate the effectiveness of an adaptive technique using horizontal dipoles to suppress the skywave interference in HF Surface Wave Radar (HFSWR). Four auxiliary horizontal dipole antennas, configured in the form of two separate crosses, were used to form an adaptive system with the vertically polarized antennas (VPA) of a HFSWR system. The outputs of the horizontal dipoles were correlated with the ... |
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| MDR/Omni-band Reconfigurable Terminal: Design Concept |
SEP 1998 |
|
| Authors:
Robin D. Addison; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| In 1997, Defence Research Establishment Ottawa and Communications Research Centre started research into an omni-band reconfigurable terminal. Such a terminal will enable armed forces personnel to use a single ground terminal to communicate over any satellite communications or terrestrial link. Each ground terminal will support multiple standards. The first one to be implemented will be extremely high frequency medium data rate communications. There are two simulators: the payload simulator and ... |
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| MDR/Omni-Band Reconfigurable Terminal: Data Packet Specification |
AUG 1998 |
|
| Authors:
Robin D. Addison; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| In 1997, Defence Research Establishment Ottawa and Communications Research Centre started research into an omni-band reconfigurable terminal. Such a terminal will enable soldiers to use a single terminal to communicate over any satellite communications or terrestrial link. Each terminal will support multiple standards and the first one to be implemented will be extremely high frequency medium data rate communications. Development begins with two hardware simulators: the payload simulator and the ... |
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| Multipurpose Data Interface Board (DIB) |
JUL 1998 |
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| Authors:
Yves Simoneau; Caroline Tom; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Defence Research Establishment Ottawa is pursuing an in-house research activity in spread-sprectrum technology to support development of robust, anti-jam satellite communications for the military. The in-house effort consists of developing a system simulator, including both a ground terminal processor and a payload processor, to research techniques involved in spread- spectrum synchronization. For these experiments, a multipurpose data interface board is required for different data operations, and is the subject of ... |
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| A Least-Squares Straight-Line Fitting Algorithm with Automatic Error Determination |
JUN 1998 |
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| Authors:
Tayananthan Thayaparan; Wayne K. Hocking; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| We demonstrate a new 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 which are expected to be linearly correlated are subject to different uncertainties in their measurements. The algorithm determines not only the optimum slope, but also produces estimates of the intrinsic errors associated with each data set. ... |
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| Mutual Coupling Between Rectangular Dielectric Resonator Antenna Elements |
MAY 1998 |
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| Authors:
Bruce Henry; Aldo Petosa; Yahia M. Antar; Gilbert A. Morin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Dielectric resonator antennas (DRAs) have been suggested as a potentially efficient antenna for use in Personal Communication Systems, Global Positioning Systems and wireless computer networks. They offer several advantages, such as high efficiency, large bandwidth, low profile, small size, ease of fabrication, and low production cost. This paper examines characteristics of the rectangular DRA, both as individual radiating elements as well as elements in array environments. Numerical methods are used ... |
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| Microwave Heating of Soil |
FEB 1998 |
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| Authors:
J. S. Seregelyi; R. Apps; M. Boyle; C. Gardner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| There are numerous applications for soil heating. For example; thawing soil prior to excavation, chemical decontamination, land mine clearance and soil sterilization are just a few potential uses. This report specifically investigates the use of microwave heating of soil. A discussion of the dielectric properties of soils has been presented. The various RF loss mechanisms have been reviewed and an empirical model has been adopted ... |
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| Measurements of Multipath and Its Effects on Terrestrial VHF Radio Direction Finding |
DEC 1997 |
|
| Authors:
William J. Read; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report details the investigation of VHF radio direction finding (DF) and the effects of multipath propagation for terrestrial paths. For this investigation, an eight channel DF system was used to make field measurements of a transmitter as it was slowly moved along a designated route. This allowed the fine scale effects of multipath on the measured signal bearing and power to be observed - effects which had been previously ... |
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| A System Study of Requirements for SHF/EHF-Terminal Phased-Array Antennas |
NOV 1997 |
|
| Authors:
E. B. Felstead; Claude J. Belisle; Gilbert A. Morin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| There is much current interest in the use of phased array antennas for military satellite communications terminals. These antennas present definite advantages over conventional dish antennas, such as electronic steering capability, conformal surface potential, and graceful degradation. In view of the potential of phased arrays, CRAD initiated an R&D project, as part of the Military Information and Technology Infrastructure (MITI) thrust, to provide advice on issues such as performance benefits, ... |
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| Ground Terminal Processor Interface Board for Skynet Uplink Synchronization Trials |
NOV 97 |
|
| Authors:
Caroline Tom; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A ground terminal (GT) simulator subsystem is being developed at Defence Research Establishment Ottawa (DREO) as part of the in-house work examining the aspects of uplink synchronization for extremely-high-frequency (EHF) spread spectrum satellite communications (SATCOM). Requirements of the GT subsystem include the generation of hop clock and data clock signals, and the interface between the GT processor and a hopping synthesizer controller (HSC) for commanding the HSC and transmitting data. ... |
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| Optical Alignment of the Spherical Antenna Measurement System |
NOV 1997 |
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| Authors:
Claude J. Brochu; John W. Moffat; Gilbert A. Morin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Precise range and positioner alignment are required for the accurate measurement of the radiation characteristics of microwave antennas using a spherical antenna measurement range. This report presents a custom designed system and novel techniques developed at DREO, based on optical instrumentation, to conveniently measure and monitor both the range alignment and the orthogonality and intersection of the multi-positioner spherical system axes. This system is an indoor spherical test range located ... |
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| Analysis of the HF Data Measured at Leitrim, Using a Matrix Calibration Method Developed at DREO |
NOV 97 |
|
| Authors:
Eric K. Hung; Zhijiang Hu; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This is the second report on the analysis of the calibration data taken with a high frequency (HF) antenna array and a signal source towed behind a small aircraft. The analysis described in this report uses the second of two array calibration methods developed by E.K.L. Hung at DREO; the previous report uses the first method. This work is part of a bigger task to develop a calibration method for ... |
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| Investigation of a Modular Antenna Array Configuration and a Feeding Technique for Brick Architecture |
SEP 1997 |
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| Authors:
J. P. Garant; Gilbert A. Morin; Yahia M. Antar; David J. Roscoe; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The satellite communications industry, following the trends seen in personal communications systems, is pursuing the development of smaller and more capable communication terminals. Several antenna technologies and architectures have been studied for a fixed-beam portable communications terminal operating at high frequencies, e.g. 20GHz (receive) and 30GHz (transmit), and capable of providing multiple data links (data, voice, video). However, additional work is required to develop a modular "brick" type of architecture ... |
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| An Analysis of the Experimental Data Measured with the Modified HF surface-Wave Radar at Cape Bonavista |
JUL 97 |
|
| Authors:
Hank W. Leong; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report presents the results of an analysis of the data measured with the experimental High-Frequency Surface-Wave Radar (HFSWR) at Cape Bonavista, after a major modification in the radar receiver. The radar was evaluated at four different radio frequencies (4.3, 10.62, 18.65 and 27.8 MHz) and a target was detected at each of the frequencies. Specifically, a low-flying Beechcraft Kingair was detected beyond the line of sight to a distance ... |
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| Study of Future Antenna Technologies for Shipboard Satellite Communications |
MAY 97 |
|
| Authors:
Gilbert A. Morin; Lyle Wagner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The purpose of this report is to document a study commissioned to Defence Research Establishment Ottawa (DREO) by Director Maritime Ship Support (DMS S) in the area of future naval satellite communications (satcom) for the Canadian Navy. The study investigated possible technology gaps in the area of satellite antenna systems for military applications, concentrating on the difficulty of installing large antenna systems on smaller size ships. With the advent of ... |
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| GPS Heading Determination Using Short Antenna Baselines |
APR 1997 |
|
| Authors:
Michael Vinnins; Lloyd D. Gallop; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Defence Research Establishment Ottawa has completed an exploratory investigation into the use of GPS as a method of heading determination for an in-ice Arctic surveillance sensor, known as an ice-pick sonobuoy, dropped from a surveillance aircraft into the ice cover of the Canadian high Arctic. The parameters within which the system was to function included operation above a latitude of 80 degrees north with a bearing ... |
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| Proceedings of the Workshop on the Microcalorimetry of Energetic Materials Held in Leeds, United Kingdom on 7-9th April 1997; TTCP; Subcommittee on Non-Atomic Military Research and Development; Subgroup W |
APR 97 |
|
| Authors:
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
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| Effect of Repair on the Electromagnetic Shielding Properties of Composite Materials |
JAN 97 |
|
| Authors:
C. L. Gardner; R. Apps; A. J. Russell; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Composite materials are increasingly being used for the construction of aircraft because of their superior physical properties. Maintenance of adequate electromagnetic (EM) shielding inside the aircraft is often a concern because of the increasing use of sensitive avionics. Degradation of EM shielding provided by the skin of the aircraft during repair can be of particular concern. In this report, we present results of measurements that we have made to examine ... |
|
| Iceberg Detection and Tracking Using High Frequency Surface Wave Radar |
JAN 97 |
|
| Authors:
Hing C. Chan; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| An iceberg surveillance experiment involving multiple sensors was carried out in a one-week period between April and May 1995. Several Canadian and U.S. Government agencies and members of industry participated. The Canadian Department of National Defence (DND), in collaboration with industry, provided high frequency surface ave radar (HFSWR) sensors, while the Canadian and U.S. Coast Guards provided surface and aerial ground tuth data. The experiment coincided with the over-flight of ... |
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| Multichannel M-Ary Frequency-Shift-Keying Block Demodulator Implementation |
DEC 96 |
|
| Authors:
Caroline Tom; Zaiqing Meng; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Military Satellite Communications (MILSATCOM) group at Defence Research Establishment Ottawa (DREO) is performing in-house satellite communications uplink synchronization experiments. A critical part of the experiment is the block demodulation of the multi-channel frequency-hopped waveform. This report analyses the Fast Fourier transform (FFT)-based demodulator implemented by Royal Military College (RMC) Kingston. This system is capable of demodulating a 32 channel, 8-ary frequency-shift-keying (FSK) waveform. The implementation consists of analog-to-digital (A/D) ... |
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| Modified Hopping Synthesizer Controller |
DEC 96 |
|
| Authors:
Robin Addison; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Defence Research Establishment Ottawa is pursuing an in-house research activity in spread spectrum technology to support development of robust, antijam satellite communications for the military. The in house effort consists of developing a system simulator to research the techniques involved in spread spectrum synchronization. For these experiments, a Hopping Synthesizer Controller is required to drive a frequency synthesizer, and is the subject of this report. The controller was built on ... |
|
| Multipath Modelling for Terrestrial VHF Radio Direction Finding |
DEC 96 |
|
| Authors:
William Read; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report details the development of computer models to investigate and explain the effects of multipath on VHF radio direction finding (DF). The motivation for this development was to help explain the large and small scale multipath effects which occur for changes in transmitter and receiver position, or for changes in frequency. Particularly important in the analysis of current wide and narrow band DF approaches and the development of better ... |
|
| Space Radiation Environment Estimation for RADARSAT II |
SEP 96 |
|
| Authors:
L. Varga; G. T. Pepper; P. Woods; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Estimation of the radiation environment for RADARSAT II satellite (to be launched in the fall 2000) is presented using industry standard space radiation models CREME and AE8/AP8. Radiation transport Monte Carlo codes TRIM and ITS 3.0 Tiger were then subsequently used to calculate the total radiation dose received by RADARSAT II during the planned 5.25 year mission. |
|
| Analysis of the Calibration Data Measured with a High-Frequency Antenna Array |
AUG 96 |
|
| Authors:
Xinping Huang; Eric K. Hung; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report contains an analysis of the antenna calibration data taken with a high frequency (HF) antenna array and a pilot source towed behind a small aircraft. The analysis used an array calibration method developed by E.K. Th. Hung. The objective was to determine whether this method was adequate for calibrating the HF antenna arrays in the Canadian Forces Supplementary Radio (CFSRS) modernization project. The study showed that the calibration ... |
|
| A Case Study of Radiation Dose Calculations for Spacecraft: The ODIN mission |
DEC 95 |
|
| Authors:
G. T. Pepper; L. Varga; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| This report summarizes the analytical approach developed to estimate the total ionizing radiation dose received by Earth orbiting satellites. The analytical tools and methodology utilized in this work represent a departure from the more traditional, 'industry standard' approaches. The approach developed was applied to the problem of determining the mission total dose for the Swedish satellite ODIN. |
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| Cyclostionary Spectral Analysis of Typical Satcom Signals using the FFT Accumulation Method |
DEC 95 |
|
| Authors:
Caroline Tom; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The suitability of cyclostationary spectral analysis for the detection and identification of typical Satcom signals is examined. An overview of the general equations for cyclostationary spectral analysis is presented. The cyclic spectrum is derived for some common Satcom modulation schemes. Cyclic spectrum estimation techniques are described with particular emphasis on the time smoothed approach. Key aspects of a computationally efficient algorithm for computing the cyclic spectrum estimates, called the 'Fast ... |
|
| Data Fusion and Correlation Techniques Testbed (DFACTT): A Command and Control Information System for Land Electronic Warfare |
DEC 95 |
|
| Authors:
Derek S. Elsaesser; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Electronic Warfare is a land combat function. To be effective on the modern battlefield, Land EW requires an integrated Command and Control Information System (CCIS). The EW CCIS must automate the tasking of EW assets, sensor data collection, and reporting of threat warnings and tactical Signals Intelligence (SIGINT) to the battlefield commander. Automation of the command and control function has changed the Electronic Waifare process, resulting in a continuously evolving ... |
|
| Estimation of Target Angular Position Under Mainbeam Jamming Conditions |
DEC 95 |
|
| Authors:
Mylene Toulgoat; Ross M. Turner; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A phased array multifunction radar (MFR) with an agile pencil beam will invariably employ a monopulse system for precise angle measurement. Such a monopulse system has three receiver channels, one channel for each of the sum, azimuth and elevation difference beamformers. This report considers a modest expansion of the number of receiving channels from three to five channels. The five channels comprise the sum channel beamformer and each half of ... |
|
| Evaluation of Rotman Lenses for Space-Based Radar |
DEC 95 |
|
| Authors:
John W. Moffat; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The Space Based Radar (SBR) R&D Project at DREO has been investigating the feasibility of the application of a number of different technologies to space based wide area surveillance using microwave radar. One of the technologies investigated was the Rotman lens implementation of a Fourier transform beam forming network. A number of Rotman lenses were designed and manufactured in stripline microwave structure under a development contract. The expected performance was ... |
|
| Implementation of an EHF Frequency-Hopping Simulator |
DEC 95 |
|
| Authors:
Robin D. Addison; William R. Seed; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| EHF SATCOM offers communications robustness by incorporating wide band frequency hopping and onboard satellite processing to mitigate the effects of electronic interference. The same characteristics that make EHF SATCOM robust however, also make it complex. Satellite onboard processing means that synchronization must be achieved for both the uplink and the downlink. The Skynet EHF (extremely high frequency) Downlink Trials consisted of several week long accesses over Skynet 4A during 1993 ... |
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| A Circular Polarization Selective Surface Made of Resonant Helices |
NOV 95 |
|
| Authors:
Gilbert A. Morin; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| A circular polarization selective surface (CPSS) is a surface that reflects one sense of circular polarization but transmits the other sense. While linear polarization selective surfaces (usually abbreviated PSS) are fairly common, CPSS's have attracted attention only recently. In this report, a new CPSS with improved characteristics is presented and potential applications are discussed. This new CPSS is made of special square helices. Because the helices can be supported at ... |
|
| Study of the Crosscorrelation Properties of the 8-Stage Maximal Length Sequences for the Testing of a Time-Integrating Correlator |
OCT 95 |
|
| Authors:
S. Faulkner; N. Brousseau; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| The purpose of this DREO Technical Note is to present experimental and theoretical results on the properties of the cross correlations of maximum length direct sequences (m-sequences). The code correlation families and the relationship between full-period and partial-period correlations are described. Results from the software developed to study the cross-correlation properties of the 8-stage m-sequences, denoted R8's, as well as, results obtained from the optical correlator and the theoretical studies ... |
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Reports by Corporate Author
