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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A spaceborne synthetic aperture radar data processor

Welsh, Simon 21 September 2023 (has links) (PDF)
This thesis is concerned with the design and implementation of a Synthetic Aperture Radar (SAR) data processor. The implementation of the processing is based on a standard sequential approach to the problem and employs commonly used algorithms. The processing was done using the C language running on an IBM Compatible Personal Computer. The raw data processed was that obtained from the Shuttle Imaging Radar B (SIRB) and was supplied by the Jet Propulsion Laboratories (JPL) in California. The basic functions performed by the software include range and azimuth processing, which involve the match filtering of reference functions with the raw data. Compensation for the effects of being a spaceborne SAR were also implemented, which involved compensation for the effect of planet rotation and radar height. Images processed by JPL of the same area were also available, which allowed for direct comparisons between the outputs of the two SAR processors. The images produced were passed through a number of filters, to improve the image quality, and resulted in favourable comparisons to the JPL generated images. The actual images are included in the later sections of the thesis.
2

TECHNOLOGY EVOLUTION AND INNOVATION IN SPACECRAFT COMMUNICATIONS

Voudouris, Thanos 10 1900 (has links)
International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California / This paper discusses the evolution of the ground satellite communication systems and the efforts made by the Goddard Space Flight Center's (GSFC) Advanced Architectures and Automation (AAA) branch, Code 588 to bring satellite scientific data to the user’s desktop. Primarily, it describes the next generation desktop system, its architecture and processing capabilities, which provide autonomous high-performance telemetry acquisition at the lowest possible cost. It also discusses the planning processes and the applicability of new technologies for communication needs in the next century. The paper is presented in terms simple for those not very familiar with current space programs to understand.
3

Radar Signal Processing on Ambric Platform : Implementing FFT and FIR algorithms and mapping on Ambric processor to evaluate massive parallelism

Pyaram, Yadagiri, Rahman, Md Mashiur January 2010 (has links)
The advanced signal processing systems of today require extreme data throughput and low power consumption.The only way to accomplish this is to use parallel processor architecture with efficient algorithms.The aim of this thesis was to evaluate the use of parallel processor architecture in Radar signal processingapplications where the processor has to compute complex calculations. This has been done by implementingdemanding algorithms on Ambric Am2000 family Massively Parallel Processor Array (MPPA). The Ambricplatform evaluated in terms of Latency, Cycle Count per output sample and Efficiency of the developmenttools.The two algorithms chosen for implementation are Fast Fourier Transform (FFT) and Finite Impulse Response(FIR) algorithms. We have implemented parameterized versions of FFT and FIR. The FFT algorithmimplemented for N-point input for the range of 8 point to 32 point for complex input variables. It works for anygiven number of inputs within the range for given parameter values and mapped on Ambric processor withfixed point radix - 2. Another one is FIR algorithm for the range of 12 Taps to 64 Taps for complex inputvariables. The Implementation of algorithms shows that high level of parallelism can be achieved in MassivelyParallel Processing Arrays (MPPA) especially on complex algorithms like FFT and FIR.
4

Försäkringsskydd för skadeståndsansvar vid dataskyddsöverträdelser : En undersökning av försäkringsvillkorens omfattning och eventuella begränsningar i förhållande till art. 82 GDPR och grupptalan / Insurance coverage for liability in case of data protection breaches : An investigation into the extent and potential limitations of insurance terms in relation to art. 82 GDPR and class action lawsuits

Nahlbom, Robin January 2024 (has links)
I uppsatsen utreds försäkringsskyddet för skadeståndsansvar vid dataskyddsöverträdelser. GDPR är den centrala regleringen för personuppgiftsbehandling och fastställer ett antal principer som måste upprätthållas för att den ansvarige ska få behandla personuppgifter. Bryter den ansvarige mot förordningens principer har den registrerade rätt att kräva skadestånd enligt art. 82.1 GDPR. Förordningen fastställer tre kumulativa krav som måste vara uppfyllda för att skadeståndsskyldighet ska föreligga. Det innefattar att en överträdelse av GDPR har skett, att materiell eller immateriell skada till följd av denna överträdelse har uppstått och att det föreligger ett orsakssamband mellan skadan och överträdelsen. Förordningen innehåller även en bestämmelse som tar över medlemsstaternas nationella skadeståndsrättsliga bestämmelser, vilket innebär att GDPR ska tillämpas enligt sin ordalydelse och att de kumulativa kraven enligt art. 82.1 GDPR måste följas. Det innebär att nationella skadeståndsrättsliga begrepp inte bör jämställas med begrepp som framgår av art. 82.1 GDPR eftersom begreppen har tillkommit i en helt annan kontext. Exempelvis översätts i vissa fall materiella och immateriella skador till ekonomiska och ideella skador. Begreppen är inte synonyma och bör inte tillställas samma betydelse eftersom terminologin i art. 82.1 GDPR kan misstolkas. Försäkringsvillkoren som reglerar skadeståndsskyldigheten för dataskyddsöverträdelser och som även hänvisar till art. 82.1 GDPR, innehåller i vissa fall nationella skadeståndsrättsliga begrepp och även andra begrepp som inte framgår av förordningen. Det kan leda till att kongruensen mellan villkorens utformning och förordningens ordalydelse medför tolkningsproblematik vid bedömning om skadeståndsskyldighet föreligger. Därför bör försäkringsvillkoren endast innehålla sådan terminologi som framgår av art. 82.1 GDPR. Dataskyddsöverträdelser medför oftast att en stor grupp människor lider skada varför förordningen tillåter registrerade att föra grupptalan med hjälp av en ideell organisation enligt art. 80 GDPR. Teoretiskt sett kan skadeståndsbeloppen bli högre än försäkringsbeloppen varför det i sådana fall saknas ett försäkringsskydd för grupptalan för den personuppgiftsansvarige. Försäkringsvillkoren anger däremot ingenting om att försäkringen inte täcker ett sådant anspråk. Därmed ställs försäkringsbolagen inför utmaningen att hantera sådana anspråk, varför försäkringen bör uppdateras för att möta skadestånd i en grupptalan vid dataskyddsöverträdelser. / The essay investigates insurance coverage for liability for damages in the event of data protection breaches. GDPR is the central regulation for the processing of personal data and establishes a number of principles that must be upheld for the data controller to process personal data. If the data controller breaches the principles of the regulation, the data subject has the right to claim damages under Art. 82.1 GDPR. The regulation sets out three cumulative requirements that must be met for liability for damages to arise. This includes that a breach of the GDPR has occurred, that material or immaterial damage as a result of this breach has arisen, and that there is a causal link between the damage and the breach. The regulation also includes a provision that supersedes the national tort law provisions of Member States, which means that the GDPR shall be applied according to its wording and that the cumulative requirements under Art. 82.1 GDPR must be followed. This means that national tort law concepts should not be equated with concepts as set out in Art. 82.1 GDPR as the concepts have arisen in a completely different context. For example, in some cases, material and immaterial damages are translated into economic and non-economic damages. The concepts are not synonymous and should not be attributed the same meaning as the terminology in Art. 82.1 GDPR can be misinterpreted. The insurance terms and conditions that regulate liability for damages in the event of data protection breaches and also refer to Art. 82.1 GDPR, in some cases contain national tort law concepts and other concepts that are not evident in the regulation. This may lead to a lack of congruence between the wording of the terms and conditions and the wording of the regulation, resulting in interpretation issues when assessing whether liability for damages exists. Therefore, the insurance terms and conditions should only contain terminology as set out in Art. 82.1 GDPR. Data protection breaches usually result in harm to a large group of people, which is why the regulation allows data subjects to bring a collective action with the assistance of a not-for-profit organization under Art. 80 GDPR. Theoretically, damages awarded may exceed insurance coverage, which means there is no insurance coverage for collective actions for the data controller in such cases. However, the insurance terms and conditions do not specify that the insurance does not cover such a claim. Therefore, insurance companies are faced with the challenge of handling such claims, which is why the insurance should be updated to cover damages in a collective action in the event of data protection breaches.

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