Filters








729 Hits in 5.2 sec

Analyzing Trajectory Gaps for Possible Rendezvous: A Summary of Results

Arun Sharma, Xun Tang, Jayant Gupta, Majid Farhadloo, Shashi Shekhar, Judith A. Verstegen, Krzysztof Janowicz
2020 International Conference Geographic Information Science  
Given trajectory data with gaps, we investigate methods to identify possible rendezvous regions. Societal applications include improving maritime safety and regulations.  ...  If trajectory data are not available around the rendezvous then either linear or shortest-path interpolation may fail to detect the possible rendezvous.  ...  Acknowledgements We would also like to thank Kim Koffolt and spatial computing research group for their helpful comments and refinements.  ... 
doi:10.4230/lipics.giscience.2021.i.13 dblp:conf/giscience/SharmaTGFS21 fatcat:kjz6rpyklbhpjbqhtsizhhxii4

Towards a Tighter Bound on Possible-Rendezvous Areas: Preliminary Results [article]

Arun Sharma, Jayant Gupta, Subhankar Ghosh
2022 arXiv   pre-print
Given trajectories with gaps, we investigate methods to tighten spatial bounds on areas (e.g., nodes in a spatial network) where possible rendezvous activity could have occurred.  ...  Most recent literature presents formal models, namely space-time prism, to track an object's rendezvous patterns within trajectory gaps on a spatial network.  ...  HM0476-20-1-0009, Project Title: Identifying Aberration Patterns in Multi-attribute Trajectory Data with Gaps). Approved for public release, 22-536.  ... 
arXiv:2206.12756v1 fatcat:kjffmn2y5rcwbn4f2rlf27ioqu

Rendezvous Strategies in the Vicinity of Earth-Moon Lagrangian Points

Stephanie Lizy-Destrez, Laurent Beauregard, Emmanuel Blazquez, Antonino Campolo, Sara Manglativi, Victor Quet
2019 Frontiers in Astronomy and Space Sciences  
Dynamics in such regions are more complex, but multi-body dynamics also come with strong advantages that need to be further researched by the work proposed here.  ...  The aim of this paper is to present methods and results of investigations conducted to first set up strategies for far and close rendezvous between a target (the LOP-G, for example) and a chaser (cargo  ...  ACKNOWLEDGMENTS The authors would like to thank all the students involved in the different research projects that permitted to write this paper as a synthesis: Jean-Baptiste Bouvier, Adrien Brunel, Loic  ... 
doi:10.3389/fspas.2018.00045 fatcat:7rxi4ui3brg27gan3wn4grawye

Multi-agent rendezvous on street networks

Malika Meghjani, Gregory Dudek
2014 2014 IEEE International Conference on Robotics and Automation (ICRA)  
In this paper we present an algorithm for finding a distance optimal rendezvous location with respect to both initial and target locations of the mobile agents.  ...  We analyze this problem in a street network scenario with two agents who are given their individual scheduled routes to complete with an underlying common goal.  ...  This problem is analyzed in two parts, (a) finding optimal rendezvous locations for meeting each robot and (b) obtaining an optimal order for visiting them.  ... 
doi:10.1109/icra.2014.6907710 dblp:conf/icra/MeghjaniD14 fatcat:rgqwbgpajzawpddjji7ma6mcsi

Asymmetric Rendezvous Search at Sea

Malika Meghjani, Florian Shkurti, Juan Camilo Gamboa Higuera, Arnold Kalmbach, David Whitney, Gregory Dudek
2014 2014 Canadian Conference on Computer and Robot Vision  
We derive conditions under which these patterns are guaranteed to find a drifter, and we empirically analyze them with respect to different parameters in simulation.  ...  The AUV's mission is to keep an estimate of the floating drifter's position while exploring the underwater environment and periodically attempting to rendezvous with it.  ...  Our objective is to analyze the success of two search strategies for finding the drifter in the form of precomputed trajectories.  ... 
doi:10.1109/crv.2014.31 dblp:conf/crv/MeghjaniSHKWD14 fatcat:qop6bnbjk5avhbtjzuclqzfo4u

How not to drown in a sea of information: An event recognition approach

Elias Alevizos, Alexander Artikis, Kostas Patroumpas, Marios Vodas, Yannis Theodoridis, Nikos Pelekis
2015 2015 IEEE International Conference on Big Data (Big Data)  
Subsequently, the compressed trajectories are analyzed by a complex event recognition engine, promptly reporting alerts to maritime authorities.  ...  We have developed a system for online vessel tracking that performs, as a first step, a high-rate but accurate trajectory compression.  ...  ACKNOWLEDGMENTS This work was carried out in the framework of the project "AMINESS: Analysis of Marine INformation for Environmentally Safe Shipping" co-financed by the European Fund for Regional Development  ... 
doi:10.1109/bigdata.2015.7363849 dblp:conf/bigdataconf/AlevizosAPVTP15 fatcat:ofofr4vb2nekdlpv4ft7bjgezy

Neo Threat Mitigation Software Tools Within The Neoshield Project And Application To 2015 Pdc

Juan L. Cano, Gabriele Bellei, Javier Martín
2015 Zenodo  
Tools are required to evaluate the NEO deflection performances of each of the different methods, coupled with the orbital mechanics associated to the need to transfer to the target orbit and maybe rendezvous  ...  In the last decade a number of mitigation methods have been pushed forward as a possible remedy to that threat, including nuclear blasts, kinetic impactor, gravity tractors and others.  ...  Previous to the analysis of the mitigation opportunities we analyze the possibility of reaching the target asteroid by rendezvous missions and by impact missions.  ... 
doi:10.5281/zenodo.891246 fatcat:sqjjsq5ryfhxlods4papkgagp4

Load Balanced Rendezvous Data Collection in Wireless Sensor Networks

Luo Mai, Longfei Shangguan, Chao Lang, Junzhao Du, Hui Liu, Zhenjiang Li, Mo Li
2011 2011 IEEE Eighth International Conference on Mobile Ad-Hoc and Sensor Systems  
In RPS-LB, according to observed properties of the median reference structure in the network, a series of Rendezvous Points (RPs) are selected to construct the trajectory for the mobile sink and the derived  ...  We introduce to jointly optimize trajectory planning for the mobile sink and workload balancing for the network.  ...  As the network grows, the problem becomes much more complicated and it is non-trivial to find the optimal trajectory with the balanced network load.  ... 
doi:10.1109/mass.2011.35 dblp:conf/mass/MaiSLDLLL11 fatcat:ema56fq4djhvzpopglueh7hhx4

Flocking of multiple Unmanned Aerial Vehicles by LQR control

Osamah Saif, Isabelle Fantoni, Arturo Zavala-Rio
2014 2014 International Conference on Unmanned Aircraft Systems (ICUAS)  
Moreover, through its implemention in UAVs, no rendezvous point is needed to perform flocking. We design a control law, which is independent of the number of UAVs in the flock.  ...  We conceive a behavior intending to adress the control design towards a successful achievement of the flocking task without fragmentation.  ...  This limitation of neighboring region leads to a fragmentation phenomenon, which appeared in the simulations results of Olfati-Saber without a rendezvous point [6] .  ... 
doi:10.1109/icuas.2014.6842259 fatcat:x2bfvrjitfawfbhjdrqflqd5ju

Neural-Rendezvous: Learning-based Robust Guidance and Control to Encounter Interstellar Objects [article]

Hiroyasu Tsukamoto, Soon-Jo Chung, Benjamin Donitz, Michel Ingham, Declan Mages, Yashwanth Kumar Nakka
2022 arXiv   pre-print
gap with respect to the solution of model predictive control, both of which are indispensable especially for such a critical space mission.  ...  In numerical simulations, Neural-Rendezvous is demonstrated to achieve a terminal-time delivery error of less than 0.2 km for 99% of the ISO candidates with realistic state uncertainty, whilst retaining  ...  as possible.  ... 
arXiv:2208.04883v1 fatcat:u4wmhwnkkzhtfczy7tkvi6d6se

Mars Missions Using Solar Electric Propulsion

Steven N. Williams, Victoria Coverstone-Carroll
2000 Journal of Spacecraft and Rockets  
Solar Electric Propulsion (SEP) trajectories are shown for Mars missions between late 2004 and 201 1. Mission performance i s presented as burn-out mass along contours of constant flight time.  ...  They then either "fall back in" or use the SEP to rendezvous with Mars as quickly as possible.  ...  The solutions are too different for a gradient technique to "bridge the gap".  ... 
doi:10.2514/2.3528 fatcat:emu22cze5zdffcqwtxb2isac34

A novel approach of overtaking maneuvering using modified RG method

Usman Ghumman, Hamid Jabbar, Mohsin Islam Tiwana, Ihsan Ullah Khalil, Faraz Kunwar, Jing Zhao
2022 PLoS ONE  
The simulations for all possible scenarios are conducted to ensure the effectiveness of proposed modified RG algorithm.  ...  This paper proposes and experimentally implements a novel approach of overtaking maneuvering using modified form of Rendezvous Guidance (RG) algorithm for trajectory planning and obstacle avoidance, considering  ...  When RG is compared to other overtaking techniques, it results in higher accuracy, less complexity and can model maximum scenarios. Rendezvous Guidance law based trajectory.  ... 
doi:10.1371/journal.pone.0260455 pmid:35051201 pmcid:PMC8776333 fatcat:ba7jmum6cnfztegydkejccatyq

Towards End-To-End Design of Spacecraft Swarms for Small-Body Reconnaissance [article]

Ravi Teja Nallapu, Jekan Thangavelautham
2019 arXiv   pre-print
In our previous work, we have developed the Automated Swarm Design module to find swarm configurations for asteroid mapping operations.  ...  The third challenge is that at a given time about half of the region will be in the Sun's shadow.  ...  trajectory design problem seeks to find trajectories that meet mission constraints such as launch energy 3 , the excess velocity at arrival planet ∞,2 , and time of flight .  ... 
arXiv:1910.03828v1 fatcat:fomrljbsobfindevcmgg5k35li

A reorbiter for large GEO debris objects using ion beam irradiation

Shoji Kitamura, Yukio Hayakawa, Satomi Kawamoto
2014 Acta Astronautica  
The worst case occurs in the low Earth orbit (LEO) region, where debris-to-debris collisions generate new debris.  ...  The ion beam convergence, the effects of ion beam irradiation, and non-cooperative rendezvous were recognized as the critical issues of this system.  ...  Fig. 5 : 5 Flowchart of the computer code for the numerical analysis of ion beam trajectories. Fig. 6 : 6 Analyzed region of the ion beam trajectories.  ... 
doi:10.1016/j.actaastro.2013.07.037 fatcat:ctfmfyjq2bfwrnujjsv32imyiu

Spatiotemporal Aquatic Field Reconstruction Using Cyber-Physical Robotic Sensor Systems

Yu Wang, Rui Tan, Guoliang Xing, Xiaobo Tan, Jianxun Wang, Ruogu Zhou
2014 ACM transactions on sensor networks  
Our approach features a rendezvous-based mobility control scheme where robotic fish collaborate in the form of a swarm to sense the aquatic environment in a series of carefully chosen rendezvous regions  ...  Information-theoretic analysis is used to guide the selection of rendezvous regions so that the spatiotemporal field reconstruction accuracy is maximized subject to the limited sensor mobility.  ...  Our approach features a rendezvous-based mobility control scheme where a sensor swarm collaborates to sense the environment in a series of carefully chosen rendezvous regions.  ... 
doi:10.1145/2505767 fatcat:s5372yeshrec5luo4x3emajdx4
« Previous Showing results 1 — 15 out of 729 results