2009 First International Conference on Advances in Satellite and Space Communications最新文献

{"title":"A Very First Geometric Dilution of Precision Proposal for Wireless Access Mobile Networks","authors":"Soumaya Zirari, P. Canalda, F. Spies","doi":"10.1109/.25","DOIUrl":"https://doi.org/10.1109/.25","url":null,"abstract":"This paper provides a description of an hybrid system merging the advantages of a GNSS such as the GPS and a wireless system such as Wi-Fi. Once a general mathematical presentation concerning all the multilateration based positioning systems, GPS, GSM and Wi-Fi is done, the paper analyses the accuracy of multilateration techniques processing absolute and/or relative distance measurements between the mobile terminal and multiple base stations such as BTS or Access Points. Based on those formulas, a simulations are done and then analysed. An interpretation of the results obtained over simulations concerning the location estimation from a geometric point of view are also given","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133068440","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":"Research on Process Modeling of Rockets Design Based on Knowledge Reuse","authors":"Haibin Liu, Shengyou Shi, Shikai Jing, Junwu Yan","doi":"10.1109/.34","DOIUrl":"https://doi.org/10.1109/.34","url":null,"abstract":"Knowledge reuse is an urge requirement of shortening cycle, improving quality and reducing cost in the rockets design process. In this paper, the knowledge application content in rockets overall design process is analyzed firstly. Then a design process model throughout requirement analyzing, function design, principle solving and structure design is proposed, in which the main purpose is to reuse knowledge effectively. Finally modeling technologies are studied comprehensively in each phase of rockets design process and a universal expression of design process is put forward based on computer aided design technologies. Our work provides a reference and guidance of integration methodology for knowledge reuse and sharing in aerospace products design process.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123079080","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":"Analysis of TCP and DTN Retransmission Algorithms in Presence of Channel Disruptions","authors":"C. Caini, P. Cornice, R. Firrincieli, M. Livini, D. Lacamera","doi":"10.1109/.9","DOIUrl":"https://doi.org/10.1109/.9","url":null,"abstract":"“Challenged Networks” often violate the TCP design key assumption of continuous path availability from the source to the sink node. These networks are the preferred target of Delay/Disruption Tolerant Networking (DTN), which aims at providing a more robust network architecture. Against disruptions, however, even standard TCP offers a certain level of robustness, through its many retransmission algorithms. The aim of the paper is to present a comparative analysis of the TCP and DTN Bundle protocol retransmission algorithms triggered by channel disruptions. This analysis provides the reader with a comprehensive view of the many mechanisms involved and a first assessment of their impact on some performance metrics. Although DTN put on top of TCP clearly offers higher resilience against long disruptions, TCP itself can provide a certain level of robustness, provided that the many retransmission parameters are properly set. The analysis is completed by some numerical evaluations on a GEO satellite channel obtained by means of a Linux testbed.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116363051","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":"Reuse of Product Design Knowledge in Space Industry","authors":"Shikai Jing, Xiaoxia Wu, Huan Xiong, Haibin Liu","doi":"10.1109/.37","DOIUrl":"https://doi.org/10.1109/.37","url":null,"abstract":"Design knowledge is very useful in space product design tasks. In this paper, the knowledge representation and reuse technology of space product design knowledge is studied, and a new case-based knowledge reuse method is presented. In the method, the case retrieval strategy that adopts the similarity-based case retrieval algorithm based on a new model is proposed. This new multilevel case model in which mapping relationship and multiple tree are the characters is constructed by analyzing the process of space product design based on the process of rocket design. Finally, the proposed method and algorithm are verified by applying to the rocket design as an example. It is shown that the new method improves the efficiency of utilization of the design knowledge in the rocket design.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121192693","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":"The Generic Nanosatellite Bus: From Space Astronomy to Formation Flying Demo to Responsive Space","authors":"F. Pranajaya, R. Zee","doi":"10.1109/.43","DOIUrl":"https://doi.org/10.1109/.43","url":null,"abstract":"The Space Flight Laboratory (SFL) at the University of Toronto Institute for Aerospace Studies develops missions using spacecraft measuring 20 by 20 cm in its cross section and up to 40 cm in length. Each spacecraft can weigh up to 15 kg with up to 9 kg of payload. One of the three SFL operational missions uses the Generic Nanosatellite Bus (GNB) form factor and was conceived, built, and delivered into orbit within seven months from project inception. This nanosatellite precedes an operational 75 kg microsatellite mission by demonstrating the payload technology. Other technologies currently in orbit include reaction wheels and propulsion system, which will be used in follow up missions. Of the five nanosatellites currently under construction at SFL, two are intended for performing astrophysics investigation, two are intended for carrying out formation flying technology demonstration, and one is intended for performing preoperational duties as a way to fast track the readiness of new technologies that are slated for larger, operational missions; the latter is currently slated for launch in Q3 2009. In addition, SFL is also providing a number of critical subsystems for an operational microsatellite mission. These spacecraft build upon a set of common components and technologies that are shared across multiple missions and implement an architecture that is directly expandable to larger, operational missions. The development of these missions follows the microspace approach for managing risks and ensuring rapid development, which maintains cost-effectiveness and responsiveness to new missions. Typically each spacecraft implements multiple on-board computers, high data rate radios, sensors and actuators. The system implements a number of redundancies to mitigate failures. The subsystem complement and the complexity of the spacecraft can be tailored to meet various mission needs, from a passively stabilized spacecraft using permanent magnets to a three-axis stabilized platform with reaction wheels with optional propulsion system. The spacecraft can also accommodate fixed appendages such as booms, antennas, and additional solar panels. SFL also builds its own separation systems called “XPODs” and arranges, on a regular basis, shared launches for nanosatellite developers worldwide through its Nanosatellite Launch Service (NLS) program.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126428335","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":"Two-Hop MIMO Relaying Systems Using Random Unitary Beamforming in Gaussian Broadcast Channels","authors":"Do-Hoon Kim, Jin-Hee Lee, Young-Chai Ko","doi":"10.1109/.42","DOIUrl":"https://doi.org/10.1109/.42","url":null,"abstract":"In this paper we propose the multi-user MIMO (MU-MIMO) with the fixed relay station (RS) transmissions scheme where the base station (BS) and the fixed RS are equipped with multiple antennas and the multiple users are equipped with a single antenna. Since the MU-MIMO can improve the sum capacity significantly by transmitting the data streams to multiple users simultaneously without much link gain while the fixed relay station can improve the link gain but loses the spectral efficiency due to the half-duplex transmission, our proposed scheme can compensate each of the drawbacks and can improve both the sum rate and the link gain. We adopt the practical random unitary beamforming (RUB) precoding method for MU-MIMO and the simple amplify-and-forward protocol for the operation of the relay station. Based on our proposed RUB based MU-MIMO with fixed RS, the sum capacity is upper bounded by the channels between the BS and the RS, not by the channels between the RS and the users. We also show from our extensive simulations that our proposed scheme has lower complexity compartively and provides the performance commensurate with the schemes presented in the literature in terms of the sum-rate for the large user scenario.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116663026","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":"Disruption Tolerant Networking Flight Validation Experiment on NASA's EPOXI Mission","authors":"J. Wyatt, S. Burleigh, Ross M. Jones, L. Torgerson, S. Wissler","doi":"10.1109/.38","DOIUrl":"https://doi.org/10.1109/.38","url":null,"abstract":"In October and November of 2008, the Jet Propulsion Laboratory installed and tested essential elements of Delay/Disruption Tolerant Networking (DTN) technology on the Deep Impact spacecraft. This experiment, called Deep Impact Network Experiment (DINET), was performed in close cooperation with the EPOXI project which has responsibility for the spacecraft. During DINET some 300 images were transmitted from the JPL nodes to the spacecraft. Then they were automatically forwarded from the spacecraft back to the JPL nodes, exercising DTN's bundle origination, transmission, acquisition, dynamic route computation, congestion control, prioritization, custody transfer, and automatic retransmission procedures, both on the spacecraft and on the ground, over a period of 27 days. All transmitted bundles were successfully received, without corruption. The DINET experiment demonstrated DTN readiness for operational use in space missions. This activity was part of a larger NASA space DTN development program to mature DTN to flight readiness for a wide variety of mission types by the end of 2011. This paper describes the DTN protocols, the flight demo implementation, validation metrics which were created for the experiment, and validation results.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125594568","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":"A Class of Low-Density Parity-Check Product Codes","authors":"M. Baldi, G. Cancellieri, F. Chiaraluce","doi":"10.1109/.24","DOIUrl":"https://doi.org/10.1109/.24","url":null,"abstract":"We propose a novel family of bi-dimensional product codes that can be interpreted as Low-Density Parity-Check (LDPC) codes. They are based on the adoption, as components, of the so-called Multiple Serially Concatenated Multiple Parity-Check (M-SC-MPC) codes, we have recently introduced. The distinctive feature of these codes is encoding and decoding simplicity that make them a valid alternative to more conventional multi-dimensional Single Parity-Check (SPC) product codes. By ensuring good error rate performance, these codes are of interest in satellite and space communications, where the goal to have limited complexity is often a fundamental issue.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130534440","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":"Knowledge Modeling of Innovation Design for Complex Product Based on Ontology","authors":"Qian Shi, Haibin Liu, Shikai Jing, Huan Xiong, H. Zhang","doi":"10.1109/.36","DOIUrl":"https://doi.org/10.1109/.36","url":null,"abstract":"As a model to provide semantic meaning through relations between concepts, ontology can resolve the problems of sharing and reuse of design knowledge. Based on the innovation design progress and knowledge structure of the complex products, an ontology construction method is proposed with the cycling evolutional theory. The application domain of the satellite ontology is analyzed. According to the analysis result, the knowledge structure of satellite ontology is put forward based on OWL (Ontology Web Language). Finally, the knowledge Modeling method based on ontology is verified by applying to the satellite design as an example.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116710403","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":"Determining Optimal Orbital Path of a Nanosatellite for Efficient Exploitation of the Solar Energy Captured","authors":"B. Mocanu, Maria-Mihaela Burlacu, J. Kohlenberg, M. Prathaban, P. Lorenz, Ruxandra Tapu","doi":"10.1109/.22","DOIUrl":"https://doi.org/10.1109/.22","url":null,"abstract":"Small satellites for earth observation are an important ongoing development in space research. Small satellites are usually powered from a solar energy system.In order to maximize the solar energy captured on small satellites, orbit path selection becomes an important parameter. In this work, we have conducted some numerical studies for future small satellites (nanosatellites) developed within the PERSEUS project. We have determined the optimal variation of the orbit angle (the minimum angle between the satellite’s orbit plane and solar vector), in order to obtain an eclipse duration as short as possible, and to maintain the angle value as long as possible thus maximizing the solar energy captured by its photovoltaic panels.","PeriodicalId":408299,"journal":{"name":"2009 First International Conference on Advances in Satellite and Space Communications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122287977","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}