DSDS 16
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Browsing DSDS 16 by Type "Presentation"
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Item Open Access Enhanced CASSI Snapshot Imager Using Dual Prism Dispersion(Cranfield University, 2017-01-06 10:53) Ding, MengjiaPoster and 3MT presentation at the 2016 Defence and Security Doctoral Symposium. Snapshot Multispectral Imaging has been a highly-efficient technique for remote sensing application in great contrast to the conventional scanning system on the aspect of military target detection, agricultural monitoring and medical examination. Among many snapshot multispectral imagers, Coded Aperture Snapshot Spectral Imager(CASSI) has been introduced for a decade with the exploitation of a simple combination of coded aperture mask and dispersive element to acquire spatial and spectral data simultaneously. My work is to use an adjustable dual-prism structure rather than the conventional single prism/double amici prism to extend the image reconstruction ability of the current CASSI system in terms of tuneable spectral channels. The simulations are carried out by ray tracing software TracePro and the performance of the system is assessed by Matlab.Item Open Access Modelling Ultraviolet Missile Seekers(Cranfield University, 2017-01-11 14:32) James, Itor3MT presentation at the 2016 Defence and Security Doctoral Symposium. Surface to Air Missile (SAM) seekers are beginning to make use of wavebands other than the traditional Infrared (IR). One of the wavebands they are beginning to use is the Ultraviolet (UV). This study aims to prove that modelling of typical missile seekers utilising UV is possible and to investigate the variables which influence the performance. The study will also investigate methods by which the aircraft targets can protect themselves by controlling their signature.Item Open Access Multi-Function RF Seeker Based on 3D Phased Array(Cranfield University, 2017-01-11 14:33) Kocjancic, Leon3MT presentation at the 2016 Defence and Security Doctoral Symposium.Current RF seekers in use today have mechanical steerable antennas. In order to reduce the cost of the mechanical system and to significantly improve the performance of the missile seeker, the electrically controlled 3D antenna array is proposed. Given solution will result in a much more robust antenna which will be capable of steering much faster and more accurately than existing solutions. Furthermore, the proposed antenna will provide an increased coverage and dwell time as a result of flexible beam steering. Additional degrees of freedom will allow it to carry out multiple tasks.The main aim of proposed PhD is to investigate theoretical background and realization of multiple beams that will conduct different tasks, such as radio-altimetry, target seeking, proximity activation and radar imaging. By using 3D antenna as a co-located multiple-input multiple-output system and by using suitable orthogonal waveforms the novel seeker will be capable of generating multiple beams.Item Open Access Passive Bistatic Radar Detection Using Non-Stationary Transmitters of Opportunity(Cranfield University, 2017-01-12 09:50) Ghazalli, Nasyitah3MT presentation at the 2016 Defence and Security Doctoral Symposium.Passive Bistatic Radar (PBR) systems use non-cooperative illuminations of opportunity to detect, localise and track targets. They have attracted a lot of interest in recent years because 1) they can be operated and deployed at a relatively low cost 2) they are difficult to detect and hence allow covert operations in a hostile environment and 3) because of the proliferation of illuminators of opportunity.Various illuminators of opportunity from analogue signal sources to digital ones, have been studied and exploited in recent years, and these include commercial broadcast systems, cellular base stations and local area networks. The aim of this research is to investigate the potential of PBR target detection in the presence of non-random signals emitted by a moving transmitter of opportunity and without the use of a reference channel. Typical transmitters of opportunity could be, for example, satellites carrying a SAR system. This research will include a study of the waveform properties, an assessment of target tracking performance and a set of experimental trials to demonstrate the feasibility of the proposed solution.Item Open Access Software vulnerability discovery and disclosure system: a systems dynamics approach(Cranfield University, 2016-12-06 16:39) Lewis, Paul3MT (three minute thesis) presented at the 2016 Defence and Security Doctoral Symposium. This research investigates this critical issue of software vulnerabilities within commercial-off-the-shelf (COTS) software. More specifically, what are the dynamics and structures of the system that is driving the increased rate of discovery, and furthermore, what impact do new innovations, policy or otherwise, have in both upon the system and in decreasing the risk organisations face. The ultimate aim of this research is to evolve the underlying theory and models, ground it in real empirical data and provide a framework to increase the understanding of the vulnerability discovery and disclosure system.Item Open Access 'Taking the heat' - developing propellants for high-temperature applications(Cranfield University, 2016-12-06 16:15) Mohammed, Yahaya3MT (three minute thesis) presented at the 2016 Defence and Security Doctoral Symposium. Since the early 1800s, nitrocellulose (NC) based propellants have gained popularity due to their low cost, ease of manufacture, and good ballistics. Vehicle airbags, small arms ammunition, aircraft ejection seat, tactical missiles and short to medium range rockets are some of the areas where NC propellants have been applied. Typical homogenous NC-based propellants depending on the energetic constituents are classified as single, double or triple base. Sometimes these propellants are further modified using high explosive additives depending on the performance requirements. The problem with NC, like other nitrate esters, is its poor thermal stability due to the weak RO-NO2 bonds especially, when exposed to high temperature and high humidity conditions as found in sub-Saharan Africa. Similarly, in deep-lying oil wells, NC propellants are problematic due to the high likelihood of ‘cook off'. Several accelerated ageing studies involving the exposure of propellants to high temperatures for the purpose of determining their failure mechanism and stability over time have been conducted. However, few of these studies were focused on the behaviours of NC propellants in tropical, sub-Saharan African climate. This research is aimed at understanding the degradation mechanism of NC propellants (double base) in a typical West African climate. The thesis will be focused on formulating alternative propellant compositions with better performance and thermal resilience. On the completion of the research, it is expected that a new surveillance technique suitable for sub-Saharan African climate will be developed. The first phase of the research will cover the thermal and mechanical analysis of NC propellants in high-temperature environments leading to the design of a bespoke propellant surveillance method for this climate. While the second the phase will cover formulation, characterization and testing of new binder and filler compositions as possible substitutes to NC-based propellants.