Bibliographies thématiques / Restricted visibility

Littérature scientifique sur le sujet « Restricted visibility »

Auteur : Grafiati
Publié le 25 mai 2024

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Articles de revues sur le sujet "Restricted visibility"

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Barnabei, Marilena, Flavio Bonetti, Niccolò Castronuovo et Matteo Silimbani. « Visibility in restricted involutions ». Journal of Difference Equations and Applications 27, no 4 (3 avril 2021) : 481–96. http://dx.doi.org/10.1080/10236198.2021.1912031.

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Mansour, Toufik, et Mark Shattuck. « Visibility in pattern-restricted permutations ». Journal of Difference Equations and Applications 26, no 5 (3 mai 2020) : 657–75. http://dx.doi.org/10.1080/10236198.2020.1780220.

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Salinas, Carlos F. « Restricted visibility : In Search of a Solution ». Journal of Navigation 59, no 2 (6 avril 2006) : 349–58. http://dx.doi.org/10.1017/s037346330621378x.

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In order to avoid a collision it has clearly been proved that for most seafarers there exists a set of possible situations known as head-on, crossing and overtaking, while ignoring in a general way the behaviour they should carry out when their vessel is in conditions of restricted visibility. It is obvious that the existence of two different manoeuvre methods in relation to the prevailing visibility confuses the navigator. But there is still more. With the arrival of AIS, the present wording of paragraph d) of Rule 19 leaves the seafarer in a state of total uncertainty when deciding the appropriate manoeuvre, so its amendment must be dealt with as a maximum priority. The following paper tries to find a solution to the dilemma, even though this does not imply a radical change in the general conception that a mariner may have of collision avoidance.
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Pietrzykowski, Zbigniew, Marek Siemianowicz et Mirosław Wielgosz. « Ship Domain in Various Visibility Conditions in Restricted Waters ». Annual of Navigation 25, no 1 (1 décembre 2018) : 41–50. http://dx.doi.org/10.1515/aon-2018-0003.

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AbstractShip domain is one of navigational safety assessment criteria. Its shape and size depend on many factors, including visibility. This article examines the influence of visibility on the shape and dimensions of ship domain in restricted waters. The research was conducted using a simulator of the ECDIS system with the participation of experts’ navigators. The domains of ships in good and restricted visibility have been compared.
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Szlapczynski, Rafal. « Evolutionary Planning of Safe Ship Tracks in Restricted Visibility ». Journal of Navigation 68, no 1 (26 septembre 2014) : 39–51. http://dx.doi.org/10.1017/s0373463314000587.

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The paper presents the continuation of the author's research on ship track planning by means of Evolutionary Algorithms (EA). The presented method uses EA to search for an optimal set of safe tracks for all ships involved in an encounter. Until now the method assumed good visibility – compliance with standard rules of the Convention on the International Regulations for Preventing Collisions at Sea (COLREGS, 1972). However, in restricted visibility, when Rule 19 applies instead of Rules 11 to 18, the problem is a different one. Therefore this paper introduces the extended method, with a focus on compliance with Rule 19 and its implications. It includes descriptions of detecting, penalizing and eliminating violations of Rule 19. The method has been implemented and the paper contains sample results of computer simulation tests carried out for ship encounters in restricted visibility in both open and restricted waters. They confirm the effectiveness of the chosen approach and suggest that the method could be applied in on board decision support systems.
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FUCHI, Masaki, Shoji FUJIMOTO, Shinnosuke USUI et Kohei HIRONO. « Vector Modes and Applying Sailing Rules in Restricted Visibility ». Journal of Japan Institute of Navigation 132 (2015) : 9–15. http://dx.doi.org/10.9749/jin.132.9.

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Mansour, Toufik, Reza Rastegar et Alexander Roitershtein. « Horizontal visibility graph of a random restricted growth sequence ». Advances in Applied Mathematics 124 (mars 2021) : 102145. http://dx.doi.org/10.1016/j.aam.2020.102145.

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SASA, Kenji, Shinji MIZUI et Tadashi HIBINO. « A Basic Study on Difficulties of Ship Operation Under Restricted Visibility Due to Heavy Fog ». Journal of Japan Institute of Navigation 112 (2005) : 13–20. http://dx.doi.org/10.9749/jin.112.13.

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Biswas, Debmalya, et Krishnamurthy Vidyasankar. « Optimal Compensation for Hierarchical Web Services Compositions Under Restricted Visibility ». International Journal of Information Systems in the Service Sector 3, no 4 (octobre 2011) : 22–38. http://dx.doi.org/10.4018/jisss.2011100102.

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Over the years, the notion of transactions has become synonymous with providing fault-tolerance, reliability and robustness to database systems. To extend the same transactional guarantees to new and evolving paradigms, such as Web service, the transactional mechanisms must first be adapted to the distinguishing characteristics of Web services, mainly composability, long-running nature, and privacy and security concerns. Composability refers to the ability to form new composite services by combining the functionalities of existing services. Due to their long-running nature, compensation based mechanisms are usually preferred to provide transactional guarantees for Web services. Compensation requires access (visibility) over the execution details of the services in the composition. However, such visibility may not always be feasible in a compositional context where component services are provided by different providers across organizational boundaries, with very strong privacy and security constraints. This paper looks at compensation options for Web services in a hierarchical composition. Multiple compensation options may be available for a composite service both at the same level and at different levels of the hierarchy. This paper shows how to find an optimal compensation option under restricted visibility.
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Browning, David, et Peter Herstein. « Environmental vocalization adaptation : Animals compensating for restricted visibility and mobility ». Journal of the Acoustical Society of America 141, no 5 (mai 2017) : 3715. http://dx.doi.org/10.1121/1.4988127.

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Thèses sur le sujet "Restricted visibility"

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Heriban, Adam. « Réseaux de robots réalistes ». Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS325.

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Le but de cette thèse est d'analyser le travail existant par la communauté de robotique distribuée pour trouver des variations réalistes du modèle standard OBLOT, et développer de nouvelles variations viables à long terme. Nous développons un nouvel algorithme optimal pour le rendez-vous avec des lumières, et le prouvons en utilisant le framework de model-checking SPIN. En utilisant ce modèle, nous construisons des algorithmes d'élection de leader robustes, permettant des contraintes plus strictes. Nous définissons un nouveau modèle de vision pour les robots mobile : Uncertain Visibility, qui utilise un adversaire pour représenter des faux-négatifs des capteurs, et prouvons les bornes de plusieurs problèmes étalons dans ce modèle. Nous définissons et analysons un nouveau problème : Obstruction Detection pour le modèle des robots opaques. Nous développons un simulateur Monte-Carlo pour les robots mobiles, conçus pour facilement simuler n'importe quel modèle ou algorithme. N'étant pas un model-checker, il vise d'abord a remplacer "l'intuition" des chercheurs pour détecter des comportement imprévus. Nous testons plusieurs algorithmes et modèles, avec des résultats encourageants. Enfin, nous présentons deux nouveaux algorithmes : le premier assure que la distance parcourue pour la convergence en ASYNC est minimale ; le second permet d'élire un Leader avec des capteurs imprécis
The goal of this thesis is to survey and analyze the current work done by the distributed robotics community to find the more realistic variations of the standard OBLOT model, develop new such variations, and determine which approach should be used in the long term. We develop a new, optimal Rendezvous algorithm using lights, and prove it using a model checking framework based on the SPIN model checker. The same luminous model is used to build robust Leader Election algorithms, which allow for stricter constraints. We design a new vision model for mobile robots, Uncertain Visibility, which introduces a vision adversary to model false negatives in sensors, and prove tight bounds under this new model for several benchmark problems. We then define and investigate a new problem, Obstruction Detection, for the obstructed visibility model. To facilitate analysis of robot networks, we develop a framework for Monte-Carlo simulations of mobile robots, designed to simulate any model or algorithm with minimal effort. It is designed as a complement to researcher "intuition" to look for unexpected behavior. We test this simulator against numerous algorithms and settings, yielding encouraging results. Finally, we introduce another two algorithms: the first ensures the distance traveled for convergence in ASYNC is minimal ; the second allows for Leader Election with errors in vision
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Livres sur le sujet "Restricted visibility"

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Yuan-Liang, Tang, Devadiga Sadashiva et United States. National Aeronautics and Space Administration., dir. A model-based approach for detection of objects in low resolution passive millimeter wave images : An interim report for NASA grant NAG-1-1371, "analysis of image sequences from sensors for restricted visibility operations", for the period January 24, 1992 to January 23, 1993. University Park PA : Dept. of Electrical and COmputer Engineering, Pennsylvania State University, 1993.

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Yuan-Liang, Tang, Devadiga Sadashiva et United States. National Aeronautics and Space Administration., dir. A model-based approach for detection of objects in low resolution passive millimeter wave images : An interim report for NASA grant NAG-1-1371, "analysis of image sequences from sensors for restricted visibility operations", for the period January 24, 1992 to January 23, 1993. University Park PA : Dept. of Electrical and COmputer Engineering, Pennsylvania State University, 1993.

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United States. National Aeronautics and Space Administration., dir. A model-based approach for detection of runways and other objects in image sequences acquired using an on-board camera : Final technical report for NASA grant NAG-1-1371, "analysis of image sequences from sensors for restricted visibility operations", period of the grant January 24, 1992 to May 31, 1994. [Washington, DC : National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., dir. A model-based approach for detection of runways and other objects in image sequences acquired using an on-board camera : Final technical report for NASA grant NAG-1-1371, "analysis of image sequences from sensors for restricted visibility operations", period of the grant January 24, 1992 to May 31, 1994. [Washington, DC : National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., dir. A model-based approach for detection of runways and other objects in image sequences acquired using an on-board camera : Final technical report for NASA grant NAG-1-1371, "analysis of image sequences from sensors for restricted visibility operations", period of the grant January 24, 1992 to May 31, 1994. [Washington, DC : National Aeronautics and Space Administration, 1994.

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Chapitres de livres sur le sujet "Restricted visibility"

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Bhagat, Subhash, Krishnendu Mukhopadhyaya et Srabani Mukhopadhyaya. « Computation Under Restricted Visibility ». Dans Distributed Computing by Mobile Entities, 134–83. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11072-7_7.

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Basu, Sujata, et Pritam Saha. « Assessment of Crash Risks at Highway Access Points with Restricted Sight Visibility ». Dans TRANSBALTICA XI : Transportation Science and Technology, 76–88. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38666-5_9.

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Biswas, Debmalya, et Krishnamurthy Vidyasankar. « Optimal Compensation for Hierarchical Web Services Compositions under Restricted Visibility ». Dans Implementation and Integration of Information Systems in the Service Sector, 205–22. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2649-2.ch013.

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Over the years, the notion of transactions has become synonymous with providing fault-tolerance, reliability and robustness to database systems. To extend the same transactional guarantees to new and evolving paradigms, such as Web service, the transactional mechanisms must first be adapted to the distinguishing characteristics of Web services, mainly composability, long-running nature, and privacy and security concerns. Composability refers to the ability to form new composite services by combining the functionalities of existing services. Due to their long-running nature, compensation based mechanisms are usually preferred to provide transactional guarantees for Web services. Compensation requires access (visibility) over the execution details of the services in the composition. However, such visibility may not always be feasible in a compositional context where component services are provided by different providers across organizational boundaries, with very strong privacy and security constraints. This paper looks at compensation options for Web services in a hierarchical composition. Multiple compensation options may be available for a composite service both at the same level and at different levels of the hierarchy. This paper shows how to find an optimal compensation option under restricted visibility.
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Lisowski, J. « The Sensitivity of Safe Ship Control in Restricted Visibility at Sea ». Dans Methods and Algorithms in Navigation, 75–84. CRC Press, 2011. http://dx.doi.org/10.1201/b11344-14.

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Lisowski, J. « Comparison of Anti-collision Game Trajectories of Ship in Good and Restricted Visibility at Sea ». Dans Activities in Navigation, 201–10. CRC Press, 2015. http://dx.doi.org/10.1201/b18513-32.

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Tremblay, Mireille. « On the Modularity of Case Theory : A Case against the Visibility Hypothesis ». Dans Projections and Interface Conditions, 109–29. Oxford University PressNew York, NY, 1997. http://dx.doi.org/10.1093/oso/9780195104141.003.0005.

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Abstract The system of grammar put forth in Chomsky (1981, 1986, 1993) is modular in the sense that “the full complexity of observed phenomena is traced to the interaction of partially independent subtheories, each with its own abstract structure” (Chomsky 1981:135). Within such a framework, we expect subtheories to interact at specific levels of representation (or at interfaces in the Minimalist Program [Chomsky 1993] ). Any principle or well-formedness condition making reference to more than one subtheory is highly suspicious. This chapter is concerned with two questions: To what extent are subtheories independent modules and should the interaction between those modules be allowed to be encoded formally in the theory of grammar, or should it be restricted to interaction on linguistic expressions, as has been proposed for the passive construction (see Chomsky 1981)? We argue in favor of a theory of grammar in which subtheories are completely independent and interact only at the interface. These issues are addressed with respect to Case and Theta theory.
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Baker, Mark C. « Agreement and the Structure of NP ». Dans The Polysynthesis Parameter, 244–78. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195093070.003.0006.

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Abstract In Chapter 5, we saw that details about agreement on the verb and its relationship to the arguments of that verb revealed aspects of the structure of clauses in polysynthetic languages. This chapter examines agreement on nouns to gain similar insight into the internal structure of NPs. Nominal in the polysynthetic languages share several unusual properties that distinguish them from nominal in a language like English. Morphologically, nouns in these languages often have agreement prefixes that are cognate, in curious ways, to the agreement prefixes of verbs. Syntactically, the internal structure of nominal in these languages is often quite simple: NPs do not have determiners or complements, for example; even possessors are much more restricted than one might expect. Ideally, these peculiarities should follow from the Morphological Visibility Condition, plus the theory of agreement developed in chapter 5. In this chapter, I will show that this ideal can be met, once one considers the implications of the MVC for the “R” argument of nouns.
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Pfeifer, Helen. « An Empire Polarized ». Dans Empire of Salons, 200–233. Princeton University Press, 2022. http://dx.doi.org/10.23943/princeton/9780691195230.003.0007.

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This chapter shows how the Ottoman policy of rotating officials, coupled with Arab efforts to seek support in Istanbul, had created a truly empire-wide network of patronage. Still, just as these relationships were solidifying, other aspects of the relationship between Arabs and Rumis shifted. As the economy slowed and competition for positions skyrocketed, Arabs, like other provincial scholars, found their access to the imperial elite to be increasingly restricted. Younger scholars no longer enjoyed the same independence and admiration that Badr al-Din al-Ghazzi did. Whereas Ghazzi taught Çivizade Mehmed, an Ottoman official from an esteemed Istanbul family, Ghazzi's student Hamawi joined the official's household as a scribe. Broader cultural shifts also led Arabs to lose some of their influence. Ottoman Turkish had gained in importance over the century, as had poetic and literary traditions in that language. Learned Arabs with only a basic knowledge of Turkish increasingly found themselves excluded from the salons in which those traditions were performed. Coupled with the increasing mastery of Arabic letters by Rumi elites, the visibility that Arabs in Ghazzi's generation had enjoyed began to fade.
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Baker, Mark C. « Embedded Clauses ». Dans The Polysynthesis Parameter, 452–95. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195093070.003.0010.

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Abstract The last topic l wish to discuss in detail is that or embedded clauses in the poly synthetic languages. The issues that arise here are partially similar to those discussed in chapter 9. In particular, embedded clauses share with PPs the property of not being NPs. This means that the standard ways of satisfying the Morphological Visibility Condition agreemenl morphology and incorporation-are not well suited to them. From this it follows that argument clauses are more restricted in polysynthetic languages than in languages or other types. This fits well with the fact that polysynthetic languages often have few clear cases of subordinate clauses, as pointed out by Mithun (1984b). However, exactly how languages adapt to this grammatical pressure is rather different for embedded clauses than for PPs. and therefore a separate discussion is warranted. Moreover, there is clear evidence that some CP complements are possible in sore polysynthetic languages, so one must account for how this can be. The Polysynthesis Parameter also has implications for the internal structure of embedded clauses. A straightforward consequence of the parameter is that it is impossible to have typical instances of non finitc complements in a polysynthetic language. This is a property of polysynthetic languages that is known to topologists and functional linguists (Heath l 97’.i, Mithun 1984b, Nichols 1992). Moreover, this property interacts with the theory of PRO to imply that the polysynthetic languages will not have control phenomena in anything like the familiar lndo-European sense.
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Gibson, Catherine. « Mapping Latvians in Local and Global Perspectives ». Dans Geographies of Nationhood, 133–75. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192844323.003.0005.

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The chapter explores the different concepts of Latvians and Latvia that emerged among mapmakers in the Baltic provinces in the late nineteenth century. The Bielenstein family of Baltic German mapmakers used maps to consolidate a vision of their Germanic Heimat in rural Kurland through the efforts of pastor August Bielenstein and his children to map the Latvian language area. This is contrasted with the outlook of Riga-based teacher, ethnographer, and museum director Matīss Siliņš, who both mapped his vision of a Latvian territory and situated Baltic inhabitants in relation to global migration patterns at the turn of the twentieth century. The chapter sets the emergence of these different spatial narratives against the backdrop of the growing demand for cheap paper products and popular science publications in vernacular languages among the population of the Baltic region, who had the highest literacy rates in the whole of the Russian Empire. Not restricted by the ban on printing in Latin script imposed on other parts of the western borderlands, printing houses in the Baltic produced maps for display at public exhibitions, on classroom walls, or for inclusion in geography textbooks. The increasing visibility of cartographic print culture in society transformed maps into a familiar object of everyday material and visual culture, spreading map literacy among a broad spectrum of lower-class Latvian-readers. The chapter elucidates the ways in which the interests of mapmakers and demands of consumers conjoined to shape cartography as a form of popular print culture in late imperial Russia.
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Actes de conférences sur le sujet "Restricted visibility"

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Dai, Houxing, et Zhaolin Wu. « Maritime Traffic Safety Assessment in Restricted Visibility ». Dans 2018 5th International Conference on Information, Cybernetics, and Computational Social Systems (ICCSS). IEEE, 2018. http://dx.doi.org/10.1109/iccss.2018.8572339.

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Biswas, Debmalya, et Krishnamurthy Vidyasankar. « Optimal compensation for hierarchical Web services compositions under restricted visibility ». Dans 2009 IEEE Asia-Pacific Services Computing Conference (APSCC). IEEE, 2009. http://dx.doi.org/10.1109/apscc.2009.5394110.

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Rathore, Muhammad Ahmad, Muhammad Usman et JongWon Kim. « Integrating Active Monitoring for Restricted Topology-awareness of SmartX Multi-View Playground Visibility ». Dans CFI 2018 : The 13th International Conference on Future Internet Technologies. New York, NY, USA : ACM, 2018. http://dx.doi.org/10.1145/3226052.3226053.

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Dai, H. X., et Z. L. Wu. « Research on Dynamic Risk Pre-evaluation System for Maritime Traffic Safety in Restricted Visibility ». Dans The 5th International Conference on Civil Engineering and Urban Planning (CEUP2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813225237_0085.

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Pacheco, Marcus Vinicius O., Felipe O. Silva et Jay A. Farrell. « GPS-Aided Odometry Navigation for IARs : Comparison Between Loosely and Tightly Coupled Integrations Under Restricted Satellite Visibility Conditions ». Dans 2023 Latin American Robotics Symposium (LARS), 2023 Brazilian Symposium on Robotics (SBR), and 2023 Workshop on Robotics in Education (WRE). IEEE, 2023. http://dx.doi.org/10.1109/lars/sbr/wre59448.2023.10333060.

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Ben-Chorin, Moshe, Silvia Chuartzman et Yehiam Prior. « Absolute distance measurements using a noisy interferometer ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cfd4.

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The spectrum of white light passing through a Michelson interferometer develops a sinusoidal modulation, the frequency of which is determined by the path difference between the interferometer arms. Dispersive white light interferometry is capable of measuring relatively large distances (hundreds of µm) with high precision, and without moving parts. However, as with all interferometric methods, it is very sensitive to phase noise arising from such factors as vibrations or air turbulence. The random phase jumps reduce the visibility of the white light fringes. This limitation imposes stringent conditions upon the stability of the interferometer, and its applicability to field measurements is thus restricted.
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Adelakun, Lateef. « Enhancing Access and Quality of Open Instructional Videos in Africa : Visibility of NOUN Repository on Social Media ». Dans Tenth Pan-Commonwealth Forum on Open Learning. Commonwealth of Learning, 2022. http://dx.doi.org/10.56059/pcf10.6850.

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National Open University of Nigeria’s (NOUN’s) open courseware has been adjudged a source of dependable open educational resources for students and instructors within and outside the ambit of open and distance learning institutions across Africa and beyond. The development of instructional videos, produced by professionals in every subject area in NOUN has significantly added value to open learning resources. Opening the instructional videos to unrestricted access particularly through social media has been a subject of debate considering the public request and the university’s need to protect the integrity of the videos. Although social media, especially YouTube, house both open and restricted access instructional videos, doubtful sources and questionable contents have made its adoption for open universal education a prolonged challenge. This work surveyed public opinion within and outside Nigeria on how social media could enhance the openness of NOUN’s instructional videos and boost the users’ trust in the contents on social media. Hinging the discussion on Uses and Gratification theoretical analysis, transporting NOUN’s instructional videos to social media was adjudged a welcome development. Substantial empirical deductions from public perceptions of the idea affirmed that the practice would lubricate the public’s interest and confidence in open and distance education.
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Maizi, Yasmina, et Ygal Bendavid. « Leveraging on the Digital Twin for improving retail store daily operations management ». Dans The 19th International Conference on Modelling and Applied Simulation. CAL-TEK srl, 2019. http://dx.doi.org/10.46354/i3m.2019.mas.013.

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With the fast development of IoT technologies and the potential of real-time data gathering, allowing decision makers to take advantage of real-time visibility on their processes, the rise of Digital Twins (DT) has attracted several research interests. DT are among the highest technological trends for the near future and their evolution is expected to transform the face of several industries and applications and opens the door to a huge number of possibilities. However, DT concept application remains at a cradle stage and it is mainly restricted to the manufacturing sector. In fact, its true potential will be revealed in many other sectors. In this research paper, we aim to propose a DT prototype for instore daily operations management and test its impact on daily operations management performances. More specifically, for this specific research work, we focus the impact analysis of DT in the fitting rooms’ area.
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Ramaswami, Hemant, et Sam Anand. « Multiple Parting Surfaces for Sand Casting ». Dans ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61845.

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Multiple parting surfaces are frequently used in sand casting, die casting and injection molding processes. However, most research in this area has focused on die casting and injection molding. Parting surfaces for die casting and injection molding are relatively easier to compute compared to sand casting because their orientations and shapes are less restricted. In sand casting, the parting surfaces have to be parallel to each other and perfectly flat to permit the use of flasks with more than two pieces. The concepts of visibility and object illumination can be used to divide an object into two parts using a single parting surface. These methods, however, cannot be directly used for multiple parting surfaces. In this paper, a methodology to generate multiple parting surfaces for sand casting is described. The method uses Gauss maps to identify potential casting directions, and global accessibility cones to determine which faces can be cast in the same part of the pattern. The pattern is sliced using parallel planes such that each slice can be withdrawn from the mold in at least one direction. After the object is sliced, the number of parting surfaces is reduced by combining adjacent middle sections depending on their accessible directions.
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Shaferman, Vitaly, et Tal Shima. « Co-Evolution Genetic Algorithm for UAV Distributed Tracking in Urban Environments ». Dans ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59590.

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A distributed approach is proposed for planning a cooperative tracking task for a team of unmanned aerial vehicles (UAVs). In the scenario of interest UAVs are required to autonomously track, using their onboard sensors, a moving target in a known urban environment. The solution methodology involves finding visibility regions, from which a UAV can maintain a line of sight to the target during the scenario; and restricted regions, in which a UAV can not fly, due to the presence of buildings or other airspace limitations. A co-evolution genetic algorithm is derived for searching, in realtime, monotonically improving solutions. In the proposed distributed search method every UAV iteratively manipulates its own population of chromosomes, each encoding its control inputs in the calculated horizon. Team performance is attained by assigning fitness to each solution in the population based on the cooperative performance when using it together with preceding iteration tracking information obtained from teammates. Important attributes of the proposed solution approach are its scalability and robustness; and consequently it can be applied to large sized problems and adapt to the loss of UAV team members. The distributed nature of the algorithm also reduces the computation and communication loads. The performance of the algorithm is studied using a high fidelity simulation test-bed incorporating a visual database of the city of Tel-Aviv, Israel.
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