{"title":"Optimal H2 and H? Control of Extremely Large Segmented Telescopes","authors":"Z. Kassas, R. Bishop","doi":"10.2514/6.2012-4529","DOIUrl":"https://doi.org/10.2514/6.2012-4529","url":null,"abstract":"Extremely large telescopes (ELTs) are the next generation of ground-based reflecting telescopes of optical wavelengths. ELTs possess an aperture of more than 20 meters and share a number of common features, particularly the use of a segmented primary mirror and adaptive optics systems. In 2005, the European Southern Observatory introduced a new giant telescope concept, named the European Extremely Large Telescope (E-ELT), which is scheduled for operation in 2018. In 2009, a feasibility study proved the feasibility of the real-time (RT) control system architecture for the E-ELT’s primary mirror, which consists of nearly 1,000 mirror segments with 3,000 actuators and 6,000 sensors. The goal of the RT control system was to maintain a perfectly aligned field of mirrors at all times with a loop-time of 1 ms. The study assumed a prescribed controller algorithm. This paper prescribes two such controllers. In this respect, optimal controller designs for the primary mirror, where optimality is formulated in the H2 and H∞ frameworks are derived. Moreover, the designed controllers are simulated to show that the desired performance, which is defined in terms of imaging requirements, is met.","PeriodicalId":191412,"journal":{"name":"AIAA Guidance, Navigation, and Control Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Pursuit and Evasion: Evolutionary Dynamics and Collective Motion","authors":"D. Pais, Naomi Ehrich Leonard","doi":"10.2514/6.2010-7584","DOIUrl":"https://doi.org/10.2514/6.2010-7584","url":null,"abstract":"Pursuit and evasion strategies are used in both biological and engineered settings; common examples include predator-prey interactions among animals, dogghting aircraft, car chases, and missile pursuit with target evasion. In this paper, we consider an evolutionary game between three strategies of pursuit (classical, constant bearing, motion camouage) and three strategies of evasion (classical, random, optical-ow based). Pursuer and evader agents are modeled as self-propelled steered particles with constant speed and strategydependent heading control. We use Monte-Carlo simulations and theoretical analysis to show convergence of the evolutionary dynamics to a pure strategy Nash equilibrium of classical pursuit vs. classical evasion. Here, evolutionary dynamics serve as a powerful tool in determining equilibria in complicated game-theoretic interactions. We extend our work to consider a novel pursuit and evasion based collective motion scheme, motivated by collective pursuit and evasion in locusts. We present simulations of collective dynamics and point to several avenues for future work.","PeriodicalId":191412,"journal":{"name":"AIAA Guidance, Navigation, and Control Conference","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124136652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Robust Performance Analysis of Hybrid Guidance Loop Models","authors":"Martin Weiss, D. Bucco","doi":"10.2514/6.2010-7743","DOIUrl":"https://doi.org/10.2514/6.2010-7743","url":null,"abstract":"","PeriodicalId":191412,"journal":{"name":"AIAA Guidance, Navigation, and Control Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134360447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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