Thesis (M.S.)--Ohio University, August, 1988. / Title from PDF t.p.

No description available.

This research is concerned with the Power Spectrum Density Estimation with em- phasIze on the bigh-resolution algorithms and their real-time implementations. Tl-ie classical PSD estimation methods are fast and robust. but their resolutions may not be adequate when the record length is short. On the other hand when the record length is short the autoregressive parametric methods have higher resolution capability, but they may have spurious peaks if the order of the model is chosen too high in the attempt to increase the resolution when the SNR is low. An algorithm is proposed to combine the spectrum of the classical method and the autoregressive model. This allows the overestimation of the order of the autoregressive model. The spuriot-is peaks that result are then suppressed by the low values in the spectrum of the classical nict liods. I'lic wide specl ral mairilobe of the classical method, on the other liand, serves to indicate the area where the true signals are located. This alleviates the difficult order selection problem of the parametric methods. An adaptive version of this method is also proposed. It is based on the adaptive autoregressive and adaptive maximum eigenvector concept. It can track a slowly changing environment. With I lie combination of these txN, o methods. it is shown that it. has the high-resolution performance of AR method ýN, ith improved performance in the noisy environment.

The worldwide aerospace industry is often characterised by major delays in development and delivery of large aircraft programmes. Suppliers often suffer financial losses and reputational damage as a result of underestimating project risks. This research investigates the quality of project risk management within one of the players in the South African avionics industry, Saab Grintek Defence (SGD). The research investigates the knowledge level, application of risk management principles and behaviour of project teams within SGD. The research study concluded that the quality of project risk management within SGD is of an average standard. The main contributor to project risks in SGD is time risk, followed by human resource risk. / Business Management / M.Com. (Business Management)

The worldwide aerospace industry is often characterised by major delays in development and delivery of large aircraft programmes. Suppliers often suffer financial losses and reputational damage as a result of underestimating project risks. This research investigates the quality of project risk management within one of the players in the South African avionics industry, Saab Grintek Defence (SGD). The research investigates the knowledge level, application of risk management principles and behaviour of project teams within SGD. The research study concluded that the quality of project risk management within SGD is of an average standard. The main contributor to project risks in SGD is time risk, followed by human resource risk. / Business Management / M.Com. (Business Management)

No description available.

International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California / The next 25 years will bring about a revolution in telemetry acquisition and processing. Airborne systems will become smaller and faster, providing additional monitoring and processing capabilities to test vehicles. In addition, ultra-high speed on-board data networks will provide communications between data collection and processing units. The telemetry platforms of tomorrow will be required to collect the entire contents of the data network, in a manner similar to today’s MIL-STD 1553 technology. The ground station of tomorrow will be required to process this bus information and provide it to the users for analysis. Ground station components, including intelligent front-ends and host processors could easily be replaced by a combination of on-board communication network processors (similar to the current 1553 processors) linked to a ground system data network. Processing could be shifted to the vehicle while ground functions remain dedicated to recording and analysis. Specialized workstations will provide for user analysis, history recording, and display. Ground networks will use shared (reflected) memory concepts to provide for addition of unlimited workstations separated by much greater distances than are associated with today’s shared memory systems.

International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California / This paper gives detailed ideas and methods about the design and development of high performance MIL-STD-1773 airborne fiber optic data bus. To reject impulsive interference efficaciously, the large core and large numerical aperture fiber optics are adopted, as well as high- emitted power LEDs and a low noise optical receiver structure to get high signal-to-noise ratio at decision time. Two new modulation technique----digital frequency shift keying and partial tri-level Manchester are recommended, which are very attractive in the design of modern optical bus. Meanwhile, VLSI chips COM1553B are used to construct bus control interface unit, thus many advantages have been brought out.

This thesis aims to provide a low-cost solution through integrating commercial off-the-shelf (COTS) technologies to produce a prototype of a "Tactical Unmanned Combat Aerial Vehicle UCAV" system that can be utilized by the front-line ground units in the near future. The Tactical UCAV is designed to enhance the information collection and autonomous precision strike capability of the ground units. The Tactical UCAV can also be deployed as sensor nodes as part of a larger global information grid in a networkcentric warfare operation. The proposed Tactical UCAV system is comprised of a Hunter Unmanned Aerial Vehicle (HUAV), which primarily carries high resolution sensors and communication devices and is used as a mother-ship for smaller "Killer UAVs (KUAV)." The KUAV carries a mission specific set of instruments; it can be a sensor or a warhead or both depending on the desired end results. After the target is acquired by the HUAV, the target information will be transferred to the KUAV. The KUAV can then be launched in close proximity of the target with the target position update from the HUAV. This thesis will focus on the development of a prototype KUAV and the integration of the prototype with the existing HUAV "Rascal" developed and operated by the Naval Postgraduate School (NPS). The KUAV and the HUAV will form the Tactical UCAV system. / Singapore Army author.

This thesis describes the design of a data structure for use with Digitised Terrain Elevation Data (DTED) in Terrain Reference Navigation (TRN) systems. The data structure is based on a variant of quad-tree and oct-tree data structures to provide an efficient representation of terrain in terms of storage requirements and acccss operations. These data structure are applied to flight path planning operations in mission management applications. The algorithms developed for flight path planning have becri implemented in the C programming language for a standard PC. Current research in TRN systems is reviewed and attention is given to the use of hierarchical data structures to cope with the potentially large data base needed for DTED files. Data structure combining quad-trees and oct-trees are developed with an emphasis on data reduction using pointerless trees and the use of locational codes to provide straightforward mapping between quad-trees and oct-trees, in other words, between two-dimensional co-ordinates and three-dimensional co-ordinates. Analysis of these algorithms is described for two DTED files to illustrate storage improvements and to verify a set of database access operations. These data structures are applied to problems of flight path planning where the navigation space comprises objects above a specific altitude and this three-dimensional space is searched for a flight path which avoids the obstacles and satisfies specific operational criteria. Algorithms are developed to extract a visibility graph from the terrain database and to determine the preferred flight path from a set of paths which satisfy defined constraints. Several search techniques are developed which exploit the efficiency of the quad-tree and oct-tree data structures. These methods are extended to real-time flight-path planning where predicted times for access operations are used to direct flight path extraction by varying the tree resolution during computation of the flight path. A comprehensive set of results are provided to illustrate: the storage efficiency of quad-tree and oct-tree data structures the application of pyramid structures to represent navigation space analysis of the time to compute the visibility graph and to extract flight paths integration of these methods with a real-time mission management simulation on a PC The thesis draws conclusions on the efficiency of these techniques for the represcntation of DTEDs and to access objects in TRN systems. It is observed that the use of hierarchical data structures in the form of quad-trees and oct-trees offers significant improvement in accessing DTEDS, for future use in TRN systems. The thesis concludes by outlining areas of further work where the techniques can be further &N, cloped for applications in mission management and navigation using DTED files.