Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.

Arbetet är en fallstudie om aktiva nautikers inställning till användandet av AIS och radar ur en navigatorisk synpunkt. Syftet var att få en uppfattning om hur ett av de nyaste elektroniska hjälpmedlen står sig mot ett av de mer inarbetade och beprövade instrumenten som finns ombord på dagens kommersiella fartyg.För att kunna få en uppfattning om vad nautikerna ansåg utfördes intervjuer ombord på ett svenskt fartyg. Frågorna som ställdes var samma för både AIS och radar för att datan skulle bli jämförbara. De slutsatser som drogs var att AIS som fristående system inte ännu är något som dagens nautiker litar på. Då radarn togs upp till diskussion var mönstret tydligt att systemet ansågs ha hög tillförlitlighet samt att nautikerna näst efter sina egna ögon litar mest på radarn bland de navigatoriska hjälpmedlen. Då en AIS integreras med en radar ansåg samtliga nautiker att tillförlitligheten på båda systemen ökar. / The essay was based upon the active nautical officer’s attitude towards the use of AIS and radar from a navigational point of view. The aim was to get a view of how one of the newest electronic aids keeps well against one of the most and the well-tried instruments that are found onboard on today's commercial vessels. In order to receive an insight the nautical officer’s opinions interviews were conducted onboard a Swedish merchant vessel. The questions that were asked were the same about both AIS and radar in order to get comparable data. The conclusions that were drawn were that AIS as an independent system is not yet something that today's nautical officers trust. When the radar was taken up to discussion all the interviewees stated that the system had high reliability and that it is the second most reliable after their own eyes among the navigational aids. The reliability of both systems increases when an AIS is integrated with a radar according to the result.

In recent years, ultra-wideband (UWB) radars are gaining popularity in the radar field mainly inindustrial and commercial areas. The UWB radar has the potential of dramatically improving thecontrol and surveillance of industrial processes in confined areas.The report provides an introduction to radar systems and detail working principle of M-sequenceUWB radar and methodology of how detection of targets is carried out. First two chapters of thereport describes the working of radar systems and M-sequence radar whereas in the later part ofthe report, different detection algorithms are discussed which has been implemented in thepresent radar simulations. In conventional radar the main detection algorithm is matched filteringwhere the transmitted signal is correlated with the received signal. Whereas UWB signal is nonsinusoidalthat is vulnerable to change in its shape during entire radar operation. This is thereason, the traditional signal processing methods like matched filtering or correlation process arenot advisable for UWB signals. Therefore, a different detection scheme known as Inter-periodcorrelation process (IPCP) has been studied.IPCP technique had been implemented and a comparison was made with the conventional targetdetection algorithm. On the basis of comparison made in this project, it has been observed thatthe conventional target detection methods are not effective in case of M-sequence UWB radar.The simulation results shows that by implementing IPCP method, performance close to 8-bitADC can be achievable with 1-bit comparator, also with IPCP implementation system resolutioncan be enhance effectively.Main focus was to analyze how close the system can detect two targets, therefore in all themeasurements i.e. practical and simulated measurements, only two targets were used.

It is important for the military to know as much as possible about how easily detected their vehicles are. One way among many used to detect vehicles is the use of radar sensors. The radar reflecting characteristics of military vehicles are therefor often rigorously tested. With measurements and simulations it is possible to calculate likely detection distances to a vehicle from different angles. This process often produces very large data sets that are hard to analyze. This thesis discusses and implements a method for visualizing the detection distance data set and also discusses a lot of related issues with a focus on computer graphics. The main concept is called spherical displacement and the idea is to visualize the detection distances as a surface with the imagined vehicle in the center point. Detection is likely inside the surface but not on the outside. This concept is the next step from the colored sphere where the colors represent the detection distance which was previously used. The thesis project resulted in a visualization tool that uses the new concept and can handle large data sets. The spherical displacement concept is more intuitive and shows detail better than the colored sphere visualization.

No description available.

Thesis (M.S. in E.C.E)--School of Electrical and Computer Engineering, Georgia Institute of Technology, 2004. Directed by Aaron Lanterman. / Includes bibliographical references (leaves 48-49).

Thesis (M.S. in Systems Engineering and M.S. in Engineering Science (Electrical Engineering))--Naval Postgraduate School, September 2003. / Thesis advisor(s): Phillip E. Pace, D. Curtis Schleher. Includes bibliographical references (p. 125-126). Also available online.

Thesis (M.S.)--Brigham Young University. Dept. of Electrical and Computer Engineering, 2003. / Includes bibliographical references (p. 103-104).

This dissertation analyzes the capability of multiple-input, multiple-output (MIMO) radar techniques to improve the image quality and area-coverage rate of synthetic aperture imaging systems. A signal processing architecture for MIMO radar is used to understand the applicability of MIMO for synthetic aperture radar (SAR) and synthetic aperture sonar (SAS) systems. MIMO SAR/SAS is shown to be a natural extension of standard multichannel synthetic aperture imaging techniques to exploit transmit degrees of freedom in addition to those used on receive. Degradation in range sidelobe performance and the associated impact on image quality is identified as a key impediment to MIMO SAR/SAS. A novel mismatched filtering approach is presented to mitigate this issue. New results in sampling theory are derived that allow the aliasing that occurs when a wide-sense stationary random process is non-uniformly sampled to be quantified. These results are applied to the case of recurrent sampling and used to quantify the impact of azimuth ambiguities on MIMO SAR/SAS image contrast.

Not available / text