Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333078
Jesús Arnau, C. Mosquera
Multibeam satellite systems are nowadays widely employed, and their use is expected to grow in the next decades. This has raised the interest for signal processing techniques able to mitigate the interference among beams, since they could enable a much more aggressive spectrum reuse. From an engineering point of view, the system design must consider as an option aggressive frequency reuse patterns, with the need to evaluate the performance of the corresponding interfering canceling techniques for the usual impairments and non-idealities of the satellite link. In this paper, we investigate the effect of a practical impairment of great importance, namely, the attenuation due to the rain, on the performance of a return link which performs MMSE interference canceling. Analytical expressions are derived for a number of performance measures based on the statistical characterization of the rain attenuation.
{"title":"Performance analysis of multiuser detection for multibeam satellites under rain fading","authors":"Jesús Arnau, C. Mosquera","doi":"10.1109/ASMS-SPSC.2012.6333078","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333078","url":null,"abstract":"Multibeam satellite systems are nowadays widely employed, and their use is expected to grow in the next decades. This has raised the interest for signal processing techniques able to mitigate the interference among beams, since they could enable a much more aggressive spectrum reuse. From an engineering point of view, the system design must consider as an option aggressive frequency reuse patterns, with the need to evaluate the performance of the corresponding interfering canceling techniques for the usual impairments and non-idealities of the satellite link. In this paper, we investigate the effect of a practical impairment of great importance, namely, the attenuation due to the rain, on the performance of a return link which performs MMSE interference canceling. Analytical expressions are derived for a number of performance measures based on the statistical characterization of the rain attenuation.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131410754","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333071
Alberto Rico-Alvariño, C. Mosquera
Hybrid terrestrial-satellite Single Frequency Networks (SFN) achieve large spectral efficiencies due to a higher frequency reuse, which is attained by transmitting the same waveform in the same frequency band from satellite and terrestrial transmitters. However, the presence of multiple transmitters propitiates the existence of the so-called SFN echoes, which can degrade the system performance even if they arrive within the Orthogonal Frequency Division Multiplexing (OFDM) guard interval. In this paper we characterize this effect by resorting to Packet Error Rate (PER) prediction metrics (or effective Signal to Noise Ratio (SNR) metrics), and analyze two simple preprocessing schemes that mitigate this degradation: the use of Alamouti space-time codes, and a convenient pre-filtering at the terrestrial transmitter.
{"title":"On the effect of echoes in hybrid terrestrial-satellite single frequency networks: Analysis and countermeasures","authors":"Alberto Rico-Alvariño, C. Mosquera","doi":"10.1109/ASMS-SPSC.2012.6333071","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333071","url":null,"abstract":"Hybrid terrestrial-satellite Single Frequency Networks (SFN) achieve large spectral efficiencies due to a higher frequency reuse, which is attained by transmitting the same waveform in the same frequency band from satellite and terrestrial transmitters. However, the presence of multiple transmitters propitiates the existence of the so-called SFN echoes, which can degrade the system performance even if they arrive within the Orthogonal Frequency Division Multiplexing (OFDM) guard interval. In this paper we characterize this effect by resorting to Packet Error Rate (PER) prediction metrics (or effective Signal to Noise Ratio (SNR) metrics), and analyze two simple preprocessing schemes that mitigate this degradation: the use of Alamouti space-time codes, and a convenient pre-filtering at the terrestrial transmitter.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123507698","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333088
Mathieu Picard, M. Oularbi, G. Flandin, S. Houcke
In the field of maritime surveillance, the space-based detection of Automatic Identification System (AIS) communications enables ship tracking and fleet monitoring with a global coverage. SAT-AIS is a joint initiative from the European Space Agency (ESA) and the European Maritime Safety Agency (EMSA) to define a sustainable space-based system that will provide AIS data to institutional organisations and other entities. The AIS communication system was not originally designed for a capture from space. As a consequence, a space-based AIS receiver faces severe technical issues, in particular a drastic amount of co-channel interferences. Astrium is working under ESA contract on an affordable SAT-AIS solution with a strong emphasis on a high-performance AIS payload and processing chain. We propose a multi-antenna AIS receiver coupled with an adaptive multi-user processing solution suited to maximize the detection of AIS messages. The proposed algorithm implements a number of diversity techniques to take advantage of the variability of received signal characteristics, especially the Direction of Arrival (DOA), incident polarization, Doppler spread, signal strength and path delay.
{"title":"An adaptive multi-user multi-antenna receiver for satellite-based AIS detection","authors":"Mathieu Picard, M. Oularbi, G. Flandin, S. Houcke","doi":"10.1109/ASMS-SPSC.2012.6333088","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333088","url":null,"abstract":"In the field of maritime surveillance, the space-based detection of Automatic Identification System (AIS) communications enables ship tracking and fleet monitoring with a global coverage. SAT-AIS is a joint initiative from the European Space Agency (ESA) and the European Maritime Safety Agency (EMSA) to define a sustainable space-based system that will provide AIS data to institutional organisations and other entities. The AIS communication system was not originally designed for a capture from space. As a consequence, a space-based AIS receiver faces severe technical issues, in particular a drastic amount of co-channel interferences. Astrium is working under ESA contract on an affordable SAT-AIS solution with a strong emphasis on a high-performance AIS payload and processing chain. We propose a multi-antenna AIS receiver coupled with an adaptive multi-user processing solution suited to maximize the detection of AIS messages. The proposed algorithm implements a number of diversity techniques to take advantage of the variability of received signal characteristics, especially the Direction of Arrival (DOA), incident polarization, Doppler spread, signal strength and path delay.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129404083","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333060
B. Friedrichs, P. Wertz
A satellite network with a GEO data relay satellite and LEO satellites is considered. Broadband data from LEO satellites are transmitted via laser intersatellite link to the GEO relay and then via microwave downlink to the ground. The GEO relay is operated as a regenerative repeater, dominated by onboard digital processing between laser and microwave links. In order to achieve maximum independence between the network elements, all data is packetized and frames are encapsulated by superframes and hyperframes in several stages. Even with the usage of well-known traditional error-control coding schemes in LEO and GEO, the interaction between coding, framing and reframing operations and the relations between various packet error rates is challenging but essential for performance assessment. The laser terminals of the optical link are subjected to microvibrations. The vibration spectra of LEO and GEO satellites are converted into a time-variant discrete-time model of the optical link, allowing the generation of error patterns for simulation purposes. The simulation is supplemented with analytical calculations for the prediction of asymptotic error rates. Results available so far prove the performance of the data processing algorithms in particular and the GEO relay concept in general.
{"title":"Error-control coding and packet processing for broadband relay satellite networks with optical and microwave links","authors":"B. Friedrichs, P. Wertz","doi":"10.1109/ASMS-SPSC.2012.6333060","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333060","url":null,"abstract":"A satellite network with a GEO data relay satellite and LEO satellites is considered. Broadband data from LEO satellites are transmitted via laser intersatellite link to the GEO relay and then via microwave downlink to the ground. The GEO relay is operated as a regenerative repeater, dominated by onboard digital processing between laser and microwave links. In order to achieve maximum independence between the network elements, all data is packetized and frames are encapsulated by superframes and hyperframes in several stages. Even with the usage of well-known traditional error-control coding schemes in LEO and GEO, the interaction between coding, framing and reframing operations and the relations between various packet error rates is challenging but essential for performance assessment. The laser terminals of the optical link are subjected to microvibrations. The vibration spectra of LEO and GEO satellites are converted into a time-variant discrete-time model of the optical link, allowing the generation of error patterns for simulation purposes. The simulation is supplemented with analytical calculations for the prediction of asymptotic error rates. Results available so far prove the performance of the data processing algorithms in particular and the GEO relay concept in general.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130344562","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333108
C. Domínguez, J. Padilla, F. Tiezzi, R. Wansch, Alexander Popugaev, L. S. Drioli
This paper presents two multi-system antennas designed for automotive mobile satellite communication applications. The antennas are optimized for the new European S-band mobile satellite systems and in addition they include also the capabilities for GPS and GSM/UMTS bands. The first model implements an S-band Receive-Only radiating element for broadcasting applications while the second contains also an S-band transmit element allowing interactive services via satellite. The achieved structures can be easily installed on cars or integrated in plastic structures of the vehicles. The details of the design of the antennas and a summary of their performances are described.
{"title":"Multi-system automotive antenna for mobile satellite communications applications","authors":"C. Domínguez, J. Padilla, F. Tiezzi, R. Wansch, Alexander Popugaev, L. S. Drioli","doi":"10.1109/ASMS-SPSC.2012.6333108","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333108","url":null,"abstract":"This paper presents two multi-system antennas designed for automotive mobile satellite communication applications. The antennas are optimized for the new European S-band mobile satellite systems and in addition they include also the capabilities for GPS and GSM/UMTS bands. The first model implements an S-band Receive-Only radiating element for broadcasting applications while the second contains also an S-band transmit element allowing interactive services via satellite. The achieved structures can be easily installed on cars or integrated in plastic structures of the vehicles. The details of the design of the antennas and a summary of their performances are described.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122863426","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333090
A. Valcarce, N. Perinpanathan, P. Febvre, A. Jahn
This paper describes two IP-level architectures for connecting 3G femtocells via Iuh to a femtocell gateway over a BGAN satellite link. These architectures allow femtocells to be deployed in isolated regions where satellite links serve as the only means of communication (e.g. oceanic outposts, deserts, rural regions, disaster areas, etc). Additionally, this paper identifies and describes several techniques to minimize bandwidth usage when backhauling Iuh traffic over the satellite. Finally, the performance of these approaches are presented and some of the main strengths and limitations of the overall system are outlined.
{"title":"Backhauling femtocell Iuh traffic over BGAN","authors":"A. Valcarce, N. Perinpanathan, P. Febvre, A. Jahn","doi":"10.1109/ASMS-SPSC.2012.6333090","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333090","url":null,"abstract":"This paper describes two IP-level architectures for connecting 3G femtocells via Iuh to a femtocell gateway over a BGAN satellite link. These architectures allow femtocells to be deployed in isolated regions where satellite links serve as the only means of communication (e.g. oceanic outposts, deserts, rural regions, disaster areas, etc). Additionally, this paper identifies and describes several techniques to minimize bandwidth usage when backhauling Iuh traffic over the satellite. Finally, the performance of these approaches are presented and some of the main strengths and limitations of the overall system are outlined.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117230361","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333113
L. Greda, A. Winterstein, A. Dreher, Martin Brück
This paper describes concept and development of some key components for a demonstrator of a multiple-beam antenna used for high-rate data relays. The demonstrator shall validate the whole antenna concept, showing among others antenna multibeam capability and advantages of the deployed digital beamforming.
{"title":"Demonstrator concept for a satellite multiple-beam antenna for high-rate data relays","authors":"L. Greda, A. Winterstein, A. Dreher, Martin Brück","doi":"10.1109/ASMS-SPSC.2012.6333113","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333113","url":null,"abstract":"This paper describes concept and development of some key components for a demonstrator of a multiple-beam antenna used for high-rate data relays. The demonstrator shall validate the whole antenna concept, showing among others antenna multibeam capability and advantages of the deployed digital beamforming.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132494363","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333084
R. Challamel, T. Calmettes, Charlotte Neyret Gigot
Maritime surveillance needs to be improved in order to provide a worldwide, independent of national borders, continuous, systematic and reliable maritime security and safety system for the benefits of end users: EU agencies, Customs, Coast Guard, Navies, Private Ventures, ... The AIS (Automatic Identification System) is an existing VHF anti collision maritime system. It is used today as a tracking system for ships. As of today, in application of SOLAS Convention Chapter V/19, all SOLAS ships worldwide above 300 tons in international voyages, passenger ships, and other cargos ships above 500 tons, have to carry an active Class A (12.5 watts) AIS transmitter/receiver. EU fishing vessels above 15m will also have to be equipped. Nowadays more than 70 000 vessels in the world are equipped with AIS class A equipment, and the estimated forecast in the future vary from 110 000 to 150 000 ships. Capturing the AIS signals from a satellite will enable to receive navigation information from ships (such as position, heading, speed, destination...), and thus will enable to enhance maritime surveillance capacities. Such system will provide added value services for the following different domains: Fleet management; Environmental; Maritime safety; Maritime security; Law enforcement & Piracy. First generation of SAT-AIS system delivers today SAT-AIS data with basic Quality of Service (main limitation being due to the issue of SAT-AIS signals collision). Even by multiplying the number of satellites, the ships detection probability of such system will remain low. There are fortunately 2 approaches to improve the QoS (Quality of Service) of AIS data collection from space, in term of ships detection capacities: The first one is to introduce a technical breakthrough in the space based AIS processing concept, thus enabling to change the order of magnitude of the QoS in dense maritime areas. Thales Alenia Space has developed such concept, enabling the system to be totally seamless (no impact on current ship AIS hardware) for the maritime community; The second one, is the introduction of a 3rd VHF frequency (not regulated today), dedicated to the space based AIS, and tuned (in term of protocol) in order also to dramatically improve the QoS. The paper will analyse how those two approaches really enable to offer High Quality of Service for the maritime community, what are their limitation, and what are the impact in term of implementation, usage and regulation. This paper will also analyse how a combination of medium performance commercial SAT-AIS system and high performance institutional SAT-AIS system can dramatically improve the EU maritime surveillance capacities.
海上监视需要改进，以便为最终用户的利益提供一个全球性的、独立于国界的、连续的、系统的和可靠的海上安全和安全系统:欧盟机构、海关、海岸警卫队、海军、私人企业……AIS(自动识别系统)是一种现有的甚高频防撞海事系统。它今天被用作船舶的跟踪系统。截至今天，在SOLAS公约第V/19章的应用中，全球所有300吨以上的国际航行SOLAS船舶，客船和其他500吨以上的货船都必须携带有效的A级(12.5瓦)AIS发射机/接收机。15米以上的欧盟渔船也必须配备这种设备。目前，世界上有7万多艘船舶配备了AIS A级设备，预计未来的船舶数量在11万至15万艘之间。捕获来自卫星的AIS信号将能够接收来自船舶的导航信息(如位置、航向、速度、目的地……)，从而能够增强海上监视能力。该系统将为以下不同领域提供增值服务:车队管理;环境;海事安全;海上安全;执法和盗版。第一代SAT-AIS系统今天提供的SAT-AIS数据具有基本的服务质量(主要限制是由于SAT-AIS信号碰撞的问题)。即使增加卫星数量，该系统对舰船的探测概率仍然很低。幸运的是，就船舶检测能力而言，有两种方法可以提高AIS从太空采集数据的QoS (Quality of Service):一是引入基于太空的AIS处理概念的技术突破，从而可以改变密集海域的QoS的数量级。泰雷兹阿莱尼亚空间公司开发了这样的概念，使系统完全无缝(不影响现有船舶AIS硬件)。第二个是引入第三个VHF频率(目前未受监管)，专用于基于空间的AIS，并进行了调整(就协议而言)，以便也显着提高QoS。本文将分析这两种方法如何真正为海事界提供高质量的服务，它们的局限性是什么，以及在实施、使用和监管方面的影响是什么。本文还将分析中等性能商用SAT-AIS系统和高性能机构SAT-AIS系统的组合如何显著提高欧盟海上监视能力。
{"title":"A European hybrid high performance Satellite-AIS system","authors":"R. Challamel, T. Calmettes, Charlotte Neyret Gigot","doi":"10.1109/ASMS-SPSC.2012.6333084","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333084","url":null,"abstract":"Maritime surveillance needs to be improved in order to provide a worldwide, independent of national borders, continuous, systematic and reliable maritime security and safety system for the benefits of end users: EU agencies, Customs, Coast Guard, Navies, Private Ventures, ... The AIS (Automatic Identification System) is an existing VHF anti collision maritime system. It is used today as a tracking system for ships. As of today, in application of SOLAS Convention Chapter V/19, all SOLAS ships worldwide above 300 tons in international voyages, passenger ships, and other cargos ships above 500 tons, have to carry an active Class A (12.5 watts) AIS transmitter/receiver. EU fishing vessels above 15m will also have to be equipped. Nowadays more than 70 000 vessels in the world are equipped with AIS class A equipment, and the estimated forecast in the future vary from 110 000 to 150 000 ships. Capturing the AIS signals from a satellite will enable to receive navigation information from ships (such as position, heading, speed, destination...), and thus will enable to enhance maritime surveillance capacities. Such system will provide added value services for the following different domains: Fleet management; Environmental; Maritime safety; Maritime security; Law enforcement & Piracy. First generation of SAT-AIS system delivers today SAT-AIS data with basic Quality of Service (main limitation being due to the issue of SAT-AIS signals collision). Even by multiplying the number of satellites, the ships detection probability of such system will remain low. There are fortunately 2 approaches to improve the QoS (Quality of Service) of AIS data collection from space, in term of ships detection capacities: The first one is to introduce a technical breakthrough in the space based AIS processing concept, thus enabling to change the order of magnitude of the QoS in dense maritime areas. Thales Alenia Space has developed such concept, enabling the system to be totally seamless (no impact on current ship AIS hardware) for the maritime community; The second one, is the introduction of a 3rd VHF frequency (not regulated today), dedicated to the space based AIS, and tuned (in term of protocol) in order also to dramatically improve the QoS. The paper will analyse how those two approaches really enable to offer High Quality of Service for the maritime community, what are their limitation, and what are the impact in term of implementation, usage and regulation. This paper will also analyse how a combination of medium performance commercial SAT-AIS system and high performance institutional SAT-AIS system can dramatically improve the EU maritime surveillance capacities.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132008467","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333089
Juan Manuel Rodriguez Bejarano, A. Yun, Borja de la Cuesta de Diego
Interactive broadband satellite systems may encounter several types of threats e.g. data communication eavesdropping, signalling spoofing, etc. The integration of security countermeasures is therefore seen as a major system requirement for institutional, military and industry applications. There are commonly two types of technologies to implement security in satellite systems: the support of secure VPN to guarantee Communications Security (COMSEC) for end to end user security communications and security at transmission level (TRANSEC) implemented at the lower protocol layers. Since the satellite networks are transparent at network layer, apparently there is no problem in the security and encryption procedures integration. However they are not always adapted and optimized to satellite networks (e.g. end-to-end IPSec is not compatible with TCP accelerator technologies that modify the transport layer information) and are far from addressing all the security requirements. This paper analyzes the different techniques used within TRANSEC and COMSEC and the most important integration issues.
{"title":"Security in IP satellite networks: COMSEC and TRANSEC integration aspects","authors":"Juan Manuel Rodriguez Bejarano, A. Yun, Borja de la Cuesta de Diego","doi":"10.1109/ASMS-SPSC.2012.6333089","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333089","url":null,"abstract":"Interactive broadband satellite systems may encounter several types of threats e.g. data communication eavesdropping, signalling spoofing, etc. The integration of security countermeasures is therefore seen as a major system requirement for institutional, military and industry applications. There are commonly two types of technologies to implement security in satellite systems: the support of secure VPN to guarantee Communications Security (COMSEC) for end to end user security communications and security at transmission level (TRANSEC) implemented at the lower protocol layers. Since the satellite networks are transparent at network layer, apparently there is no problem in the security and encryption procedures integration. However they are not always adapted and optimized to satellite networks (e.g. end-to-end IPSec is not compatible with TCP accelerator technologies that modify the transport layer information) and are far from addressing all the security requirements. This paper analyzes the different techniques used within TRANSEC and COMSEC and the most important integration issues.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130082095","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}
Pub Date : 2012-10-18DOI: 10.1109/ASMS-SPSC.2012.6333107
F. Tiezzi, J. Padilla, C. Viganó
This paper presents the design of an intermediate gain S-band antenna with electronic beam steering capabilities. The antenna allows simultaneous reception and transmission of S-band signals and can track the position of a geostationary satellite by electronically switching among a finite set of beams. The tracking system is based on combination of position and attitude sensors embedded in the antenna. The antenna has a low-profile design that allows an easy installation on vehicles without altering their aerodynamics. The main aspects of the antenna implementation are described together with the results obtained with the first prototypes of the antenna.
{"title":"S-band transmit/receive antenna with electronically switched beams for mobile satellite systems","authors":"F. Tiezzi, J. Padilla, C. Viganó","doi":"10.1109/ASMS-SPSC.2012.6333107","DOIUrl":"https://doi.org/10.1109/ASMS-SPSC.2012.6333107","url":null,"abstract":"This paper presents the design of an intermediate gain S-band antenna with electronic beam steering capabilities. The antenna allows simultaneous reception and transmission of S-band signals and can track the position of a geostationary satellite by electronically switching among a finite set of beams. The tracking system is based on combination of position and attitude sensors embedded in the antenna. The antenna has a low-profile design that allows an easy installation on vehicles without altering their aerodynamics. The main aspects of the antenna implementation are described together with the results obtained with the first prototypes of the antenna.","PeriodicalId":303959,"journal":{"name":"2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134152353","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：