38th International Communications Satellite Systems Conference (ICSSC 2021)最新文献

The Western Australian optical ground station 西澳大利亚光学地面站

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 2022-01-25 DOI: 10.1049/icp.2022.0552

S. Walsh, A. Frost, W. Anderson, Toby Digney, B. Dix-Matthews, D. Gozzard, Charles T. Gravestock, L. Howard, S. Karpathakis, A. McCann, S. Schediwy

{"title":"The Western Australian optical ground station","authors":"S. Walsh, A. Frost, W. Anderson, Toby Digney, B. Dix-Matthews, D. Gozzard, Charles T. Gravestock, L. Howard, S. Karpathakis, A. McCann, S. Schediwy","doi":"10.1049/icp.2022.0552","DOIUrl":"https://doi.org/10.1049/icp.2022.0552","url":null,"abstract":"Free-space communications at optical wavelengths offers the potential for orders-of-magnitude improvement in data rates over conventional radio wavelengths, and this will be needed to meet the demand of future space-to-ground applications. Supporting this new paradigm necessitates a global network of optical ground stations. This paper describes the architecture and commissioning of the Western Australian Optical Ground Station, to be installed on the roof of the physics building at the University of Western Australia. This ground station will incorporate amplitude- and phase-stabilisation technology, previously demonstrated over horizontal free-space links, into the ground station's optical telescope. Trialling this advanced amplitude- and phase-stabilisation technology, the ground station will overcome turbulence-induced noise to establish stable, coherent free-space links between ground-to-air and ground-to-space. These links will enable significant advances in high-speed and quantum-secured communications; positioning, navigation, and timing; and fundamental physics.","PeriodicalId":401042,"journal":{"name":"38th International Communications Satellite Systems Conference (ICSSC 2021)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126712035","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}

引用次数: 2

Performance of modern web protocols over satellite links 现代网络协议在卫星链路上的性能

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0564

Jörg Deutschmann, K. Hielscher, Reinhard German

{"title":"Performance of modern web protocols over satellite links","authors":"Jörg Deutschmann, K. Hielscher, Reinhard German","doi":"10.1049/icp.2022.0564","DOIUrl":"https://doi.org/10.1049/icp.2022.0564","url":null,"abstract":"The Internet changes towards more encrypted traffic and encrypted protocols. This is due to an increase in home office use with Virtual Private Networks (VPNs), and new protocols especially QUIC. Both VPNs and QUIC are problematic for Internet access via geostationary satellites, because Performance Enhancing Proxies, which mitigate the negative effects of high latency links, cannot be applied anymore. Considering recent developments, we run performance measurements with an artificial website, different protocols (HTTP/1.1, HTTP/2, HTTP/3 and QUIC), with and without VPNs, and real satellite links (four European geostationary satellite systems and the new Starlink low-earth orbit megaconstellation). The measurement results for geostationary satellite Internet access show (a) lowest loading times with HTTP/2 and PEPs, (b) HTTP/3 and QUIC cannot be optimized by PEPs but still outperforms HTTP/1.1 with PEPs, (c) in case of VPNs, i.e., when PEPs are not applicable, HTTP/3 and QUIC performs bests. Starlink has lower loading times than geostationary Internet access regardless of VPNs. We also review current IETF activities and introduce the new QUICSAT project, which aims at improving protocols for satellite networks.","PeriodicalId":401042,"journal":{"name":"38th International Communications Satellite Systems Conference (ICSSC 2021)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129023076","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}

引用次数: 1

Automatic identification of home IOT devices for traffic management in satellite networks 用于卫星网络流量管理的家庭物联网设备的自动识别

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0550

S. Roy, A. Ravichandran

{"title":"Automatic identification of home IOT devices for traffic management in satellite networks","authors":"S. Roy, A. Ravichandran","doi":"10.1049/icp.2022.0550","DOIUrl":"https://doi.org/10.1049/icp.2022.0550","url":null,"abstract":"The widespread emergence of Internet-connected devices raises concerns about Internet of Things (IoT) traffic management in a consumer satellite network. For efficient IoT traffic management of such networks, detecting a device's semantic type is extremely important. This paper covers the challenges and solutions in identifying devices based on signatures of traffic flowing between locally connected devices and over-the-air sessions from devices behind Very Small Aperture Terminals (VSATs). Machine Learning (ML) techniques are used to predict device characteristics, and then IoT traffic can be carried via satellite channels according to the rule defined for each device type. For the first time, device-based IoT traffic classification is applied to a satellite network that greatly differs from terrestrial networks due to its resource-constrained return link. A supervised machine learning, Random Forest Classification algorithm is applied to multiple continuous datasets, and then resulting estimators are combined to produce a model using which the type and behaviour of an IoT device are predicted. Test results show an encouraging accuracy. The paper proposes a forward-looking federated learning model training that would produce better accuracy where a server in a central location trains a global learning model using machine learning parameters received from multiple edge VSATs.","PeriodicalId":401042,"journal":{"name":"38th International Communications Satellite Systems Conference (ICSSC 2021)","volume":"2021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130586006","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}

引用次数: 0

Markov modelling of land mobile satellite channel for DVB S2X superframing performance evaluation 陆地移动卫星信道的Markov建模用于DVB S2X超分帧性能评价

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0567

B. Unal, A. Karasuwa, N. Avlonitis, Pansoo Kim, I. Otung

引用次数: 0

Development of an airborne hyperspectral scanning camera system for agricultural missions 用于农业任务的机载高光谱扫描相机系统的研制

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0582

M. A. Maestro, Andrew Rafael Bañas, Micherene Clauzette Peralta Lofamia, Ralph Aaron, Aguinaldo, Rogie Bernabe, D. J. Occeña, Lorenz R. Toleos, Jholeeh Charls, Madalipay, M. Soriano

引用次数: 0

Communication waveform performance prediction in partial-band partial-time jamming RF environments 部分频带部分时间干扰射频环境下通信波形性能预测

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0563

X. Tian, Y. Li, G. Chen, K. Pham

{"title":"Communication waveform performance prediction in partial-band partial-time jamming RF environments","authors":"X. Tian, Y. Li, G. Chen, K. Pham","doi":"10.1049/icp.2022.0563","DOIUrl":"https://doi.org/10.1049/icp.2022.0563","url":null,"abstract":"In complex radio frequency (RF) environments with partial-band and partial-time (PBPT) jamming, the Signal-to-Noise Ratio (SNR) of a communication link may have multi-modal distributions over a range of SNR levels. The control of transmission powers in a communication system is able to shift the link SNR distribution up or down without altering the distribution's shape. However, it is important to determine how much a link SNR distribution should be shifted such that a communication waveform is able to operate. In this paper, a neural network (NN) based method is proposed to evaluate the required SNR shift for a waveform to operate on a link with complex multi-modal SNR distribution. The NN inputs are derived from a normalized SNR distribution, which is a shifted version of the “actual” (measured) link SNR distribution. The NN output is the required minimum SNR shift of the normalized SNR distribution, i.e., a normalized SNR shift, for the waveform to yield Bit-Error-Rates (BERs) less than a specified maximum acceptable rate. The NN may be trained with training data samples obtained from simulations or emulations. After training, the NN is shown to be able to accurately evaluate the required normalized SNR shift for a range of normalized link SNR distributions corresponding to various complex communication link SNR conditions. Based on the NN's evaluations, accurate transmission power control and/or waveform selection can be achieved in communication systems operating in complex PBPT jamming RF environments, which lead to superior communication performance and robustness.","PeriodicalId":401042,"journal":{"name":"38th International Communications Satellite Systems Conference (ICSSC 2021)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123864989","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}

引用次数: 1

Experimental study of external interference mitigation for LEO based sensing (AIS) 低轨道遥感(AIS)外部干扰抑制实验研究

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0576

D. Hirahara

引用次数: 0

Performance evaluation of different 5G NB-IoT satellite systems 不同5G NB-IoT卫星系统性能评估

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0561

R. Barbau, V. Deslandes, G. Jakllar, A. Beylot

引用次数: 1

A localized spaceborne camera for nano- and micro-satellite platforms 一种用于纳微卫星平台的国产化星载相机

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0581

D. J. Occeña, R. Bernabe, M. J. Alampay, A. Hernandez, J. C. Madalipay, P. L. Hilario, M. Soriano

引用次数: 0

Measurements of tree attenuation by seasonal change of vegetation using two different elevation angle satellite for Ka-band mobile satellite communication ka波段移动卫星通信两颗不同仰角卫星植被季节变化对树木衰减的测量

38th International Communications Satellite Systems Conference (ICSSC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2022.0577

K. Tomoshige, J. Byeongpyo, S. Hajime, T. Takashi

{"title":"Measurements of tree attenuation by seasonal change of vegetation using two different elevation angle satellite for Ka-band mobile satellite communication","authors":"K. Tomoshige, J. Byeongpyo, S. Hajime, T. Takashi","doi":"10.1049/icp.2022.0577","DOIUrl":"https://doi.org/10.1049/icp.2022.0577","url":null,"abstract":"NICT of Japan has performed communications propagation measurements between the WINDS and a moving vehicle earth station. Understanding the propagation environment is an important factor when constructing a communications system. NICT has been made communications propagation measurements between WINDS and the moving vehicle earth station. A shadowing has been identified as having a large impact on satellite communications due to the use of a directional Ka-band antenna with high rectilinearity in these studies. We measure the attenuation of the received signal from the satellite throughout the year with shadowing from several types of trees to capture these seasonal differences. We have already reported the results of our year-long investigation, where we observe seasonal fluctuations in the received power beneath deciduous trees but no such variations beneath evergreen trees using WINDS. We have modified the vehicle earth station so that it can capture satellites other than the WINDS satellite. The WINDS satellite was located at 143 degrees east longitude, but this target satellite is located at 110 degrees east longitude. So, we can measure at a different elevation angle than previous measurements. In this report, we explain comparison of tree attenuation measurement results from two satellites with different elevation angles.","PeriodicalId":401042,"journal":{"name":"38th International Communications Satellite Systems Conference (ICSSC 2021)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131559704","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}

引用次数: 0