International Journal of Satellite Communications and Networking最新文献_第10页

Exclusion zone minimization and optimal operational mode selection for co‐existent geostationary and non‐geostationary satellites 地球静止卫星和非地球静止卫星共存的禁区最小化和最佳运行模式选择

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-10-19 DOI: 10.1002/sat.1433

F. Öztürk, A. Kara

{"title":"Exclusion zone minimization and optimal operational mode selection for co‐existent geostationary and non‐geostationary satellites","authors":"F. Öztürk, A. Kara","doi":"10.1002/sat.1433","DOIUrl":"https://doi.org/10.1002/sat.1433","url":null,"abstract":"The number of satellites has been increasing in both geostationary (GEO) and non‐geostationary (NGEO) earth orbits. Due to the limited availability of spectrum resources, the interference risk among these satellite networks has been increasing consequently. In such a scenario, the protection of existent GEO transmissions is crucial. In this paper, the co‐existence downlink interference from a typical low earth orbit (LEO) constellation to earth stations of GEO satellites is examined for minimization of exclusion zone on the equatorial region. Two different operational scenario based on modulation and coding (MODCOD) with/without spread spectrum for the LEO system are considered. A multiobjective optimization problem (MOP) is formulated for nondominant solutions set based on exclusive angle minimization and bandwidth utilization of the LEO link. It is shown that the exclusive angle can be reduced up to 21.3% and 19.6%, compared with the initial anchor point at the transmission bit rates of 100 and 200 Mbps, respectively. The proposed optimal operational setting minimizes the interference risk to the GEO satellite network as well as maintains quality of service (QoS) for the LEO communication network. The results provide optimal operational mode selection for LEO satellite operators and/or decision makers.","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"40 1","pages":"191 - 203"},"PeriodicalIF":1.7,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46582172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

On jamming detection methods for satellite Internet of Things networks 卫星物联网干扰检测方法研究

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-10-17 DOI: 10.1002/sat.1431

G. Taricco, N. Alagha

{"title":"On jamming detection methods for satellite Internet of Things networks","authors":"G. Taricco, N. Alagha","doi":"10.1002/sat.1431","DOIUrl":"https://doi.org/10.1002/sat.1431","url":null,"abstract":"Despite the fast growth of machine‐type communications via satellite, the vulnerability of such networks to intentional interference and malicious jamming attacks is a raising concern. Specifically, in this paper, we address a class of jamming attacks in which the adversary uses the underlying knowledge of the satellite physical and access protocol to increase the jamming impact. In particular, we focused on a type of camouflage jamming attack (using publicly known preamble) to deceive the receiver, which rapidly leads to poor performance. Compared to conventional constant jamming attacks, these jamming strategies are known to be more effective and potentially more harmful to the targeted communication network. We analyze methods to detect such jamming attacks and provide examples of jamming detection techniques for the satellite Internet of Things (IoT) networks. Results indicate the effective performance of the jamming detection techniques for a variety of representative system parameters. More specifically, we introduce a simple (counting) jamming detection method along with numerical results for realistic system parameters, which confirms system design vulnerability as well as how the jammer may improve her strategy.","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"40 1","pages":"177 - 190"},"PeriodicalIF":1.7,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46665789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Atmospheric absorption and scattering impact on optical satellite-ground links 大气吸收和散射对光学卫星-地面链路的影响

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-10-07 DOI: 10.1002/sat.1426

Dirk Giggenbach, Amita Shrestha

{"title":"Atmospheric absorption and scattering impact on optical satellite-ground links","authors":"Dirk Giggenbach, Amita Shrestha","doi":"10.1002/sat.1426","DOIUrl":"10.1002/sat.1426","url":null,"abstract":"<p>Free-space radio-frequency (RF) communication links for intersatellite or satellite-to-ground communications are getting increasingly constraint by the insufficient spectrum availability and limited data rate of RF technology. With the advent of large satellite mega-constellation networks for global communications coverage, this limitation of classical RF communication becomes even more critical. Therefore, the establishment of point-to-point free-space optical link technology (FSO) in space will become of paramount importance in future systems, where the application will be for data-relays links, or for mega-constellations inter-satellite links, as well as for direct data downlinks, or from deep-space probes to ground. Further advantages of optical FSO—besides spectrum availability—is its increased power efficiency, higher data rates, avoidance of interference, and inherent protection against interception. When, however, these optical communication links have to pass through Earth's atmosphere, attenuation and scattering effects do influence the signal transmission. In this publication, we investigate the effects of atmospheric attenuation, including the effects of molecular absorption as well as aerosol scattering and absorption, for typical wavelength regions used for FSO, dependent on the link geometries. Based on transmission-simulation databases, we show useful spectral ranges and their specific attenuation strength. Free spectral transmission windows dependent on atmospheric quality and elevation angle are identified for reliable and efficient use of the optical transmission technology in space applications.</p>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"40 2","pages":"157-176"},"PeriodicalIF":1.7,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/sat.1426","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45289148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Satellite forward VDES channel modeling and impact on higher-layer performance 卫星前向VDES信道建模及其对高层性能的影响

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-10-05 DOI: 10.1002/sat.1430

Giovanni Giambene, Iago Gomez, Tomaso de Cola, Roshith Sebastian, MD Saifur Rahman

引用次数: 0

Design of a 3D ray-tracing model based on digital elevation model for comprehension of large- and small-scale propagation phenomena over the Martian surface 设计了一种基于数字高程模型的三维光线追踪模型，用于理解火星表面大尺度和小尺度的传播现象

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-21 DOI: 10.1002/sat.1423

Stefano Bonafini, Claudio Sacchi

{"title":"Design of a 3D ray-tracing model based on digital elevation model for comprehension of large- and small-scale propagation phenomena over the Martian surface","authors":"Stefano Bonafini, Claudio Sacchi","doi":"10.1002/sat.1423","DOIUrl":"10.1002/sat.1423","url":null,"abstract":"<p>The aim of the scientific community, towards the investigation of solutions able to favor a futuristic human settlement on Mars, also concerns ad hoc communication systems and wireless networks to be deployed over the “Red planet.” However, the state-of-the-art appears to be missing of realistic and replicable models for understanding the radio propagation over precise Martian locations. This means that performing solid simulations, rather than roughly approximated ones, is really a tough task. Thus, this paper describes the design of a 3D ray-tracing simulator based on high-resolution digital elevation models (DEMs) for the evaluation of Martian large-scale and small-scale phenomena in the S and EHF bands. First, by taking advantage of the Cole–Cole equations, we computed the complex permittivity of the JSC Mars-1 Martian regolith simulant. Then, we developed a 3D tile-based structure of the Gale crater, thanks to its DEM, and finally, we implemented a ray-tracing algorithm for outdoor environments able to trace the line of sight (LOS), the first and second reflections of a radio frequency (RF) signal between a transmitter (TX) and a receiver (RX) over the 3D structure. The results focus on estimating path losses, shadowing values, outage probability, and on the parametrization of multipath channels for selected areas and subareas, presenting heavily different morphological features, of the Gale crater. Moreover, some brief considerations about dust storms and atmosphere harmful effects on propagation will be drawn.</p>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"40 6","pages":"408-427"},"PeriodicalIF":1.7,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/sat.1423","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42080788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Performance bounds for VDE-SAT R-Mode VDE‐SAT R‐模式的性能界限

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-19 DOI: 10.1002/sat.1429

Jan Šafář, Alan Grant, Martin Bransby

{"title":"Performance bounds for VDE-SAT R-Mode","authors":"Jan Šafář, Alan Grant, Martin Bransby","doi":"10.1002/sat.1429","DOIUrl":"10.1002/sat.1429","url":null,"abstract":"<div>\u0000 \u0000 <p>There has been growing interest within the satellite navigation community in the possibility of delivering positioning and timing services from existing or emerging constellations of Low-Earth Orbit communication satellites. At the same time, the international maritime community has been investigating the potential use of communication signals transmitted from shore-based stations for positioning—a concept commonly referred to as ‘ranging mode’, or R-Mode. The driving force for these developments is the desire to reduce the reliance on traditional Global Navigation Satellite Systems (GNSS). One of the technologies being considered for use in R-Mode is the evolution of the Automatic Identification System (AIS) known as the Very High Frequency Data Exchange System (VDES). VDES has a terrestrial and a satellite component. The feasibility of using terrestrial VDES transmissions for ranging was studied in a previous publication by the authors. This paper builds on the previous study and extends its results to the satellite component of VDES. Statistical bounds on the ranging error are derived for all downlink waveforms currently being considered for use in satellite VDES and for several custom-designed transmission formats. The analysis supports the feasibility of using both the existing and custom waveforms in ranging applications and points to related trade-offs that will need to be considered in the design of satellite VDES R-Mode systems.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"41 2","pages":"134-157"},"PeriodicalIF":1.7,"publicationDate":"2021-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45295442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Review of antenna technologies for very high frequency Data Exchange Systems 甚高频数据交换系统天线技术综述

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-14 DOI: 10.1002/sat.1428

Victoria Gómez-Guillamón Buendía, Salvatore Liberto, George Goussetis, Nelson J. G. Fonseca

{"title":"Review of antenna technologies for very high frequency Data Exchange Systems","authors":"Victoria Gómez-Guillamón Buendía, Salvatore Liberto, George Goussetis, Nelson J. G. Fonseca","doi":"10.1002/sat.1428","DOIUrl":"10.1002/sat.1428","url":null,"abstract":"<div>\u0000 \u0000 <p>The Automated Identification System (AIS) was originally developed as a terrestrial system tracking vessels near the coastline. Dedicated channels were allocated within the spectrum historically reserved for maritime applications in the very high frequency (VHF) band, enabling long range communications, up to a few kilometers. There have been various initiatives in the last decade that extended this system with a space segment, enabling global monitoring of vessels beyond the range of terrestrial stations. Recently, the World Radiocommunication Conference has allocated frequencies for the extension of this system to a two-way VHF Data Exchange System (VDES) via satellite. This requires to adapt spaceborne antenna solutions previously developed for AIS, particularly for missions using small satellites and CubeSats. This paper provides a timely review of existing VHF antenna solutions and new concepts under development which could be applicable to VDES missions. Some key metrics are identified to provide a comparative study between various candidate solutions. Considering the range of possible missions, from secondary payloads on-board larger satellites to dedicated constellations, it is believed that a number of antenna products can find application in future VDES space-based infrastructure.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"41 2","pages":"122-133"},"PeriodicalIF":1.7,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/sat.1428","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42310191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

VDES R-Mode: Vulnerability analysis and mitigation concepts VDES R‐模式：脆弱性分析和缓解概念

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-12 DOI: 10.1002/sat.1427

Francisco Lázaro, Ronald Raulefs, Hannes Bartz, Thomas Jerkovits

引用次数: 2

Global Navigation Satellite Systems Spoofing Detection through measured Autocorrelation Function Shape Distortion 基于测量自相关函数形状畸变的全球导航卫星系统欺骗检测

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-01 DOI: 10.1002/sat.1425

Abdul Malik Khan, Attiq Ahmad

{"title":"Global Navigation Satellite Systems Spoofing Detection through measured Autocorrelation Function Shape Distortion","authors":"Abdul Malik Khan, Attiq Ahmad","doi":"10.1002/sat.1425","DOIUrl":"10.1002/sat.1425","url":null,"abstract":"<div>\u0000 \u0000 <p>With the expansion in Global Navigation Satellite System (GNSS) constellations and emerging applications utilizing GNSS systems, the issue of detection of interference is evolving as a growing concern in the satellite navigation user community. Threats for GNSS users can be classified as unintentional interference, jamming, and spoofing. Spoofing is more harmful among them because the target receiver might not be aware of the attack and, as a consequence, generate misleading position information. Spoofing attacks are classified as simplistic, intermediate, and sophisticated depending on their complexity of implementation. We focused primarily on the detection of intermediate spoofing attacks by measuring shape distortion (SD) through multiple correlators that cover multiple chips around the prompt tracking point. The SD metric compares the measured and typical values of the autocorrelation function and decides on the spoofing using a noise variance based threshold. The proposed SD metric is found to be very effective in detecting the spoofing attack during the pull-off phase of the attack. The method is verified through simulations, synthetic spoofing data, and the TEXBAT data shared by the University of Texas, Austin. Different formulations of the proposed method are compared to provide an optimal number of correlator taps in each channel.</p>\u0000 </div>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"40 2","pages":"148-156"},"PeriodicalIF":1.7,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/sat.1425","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46407924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

VDES R-Mode performance analysis and experimental results VDES R - Mode性能分析及实验结果

IF 1.7 4区计算机科学

International Journal of Satellite Communications and Networking Pub Date : 2021-09-01 DOI: 10.1002/sat.1424

Markus Wirsing, Armin Dammann, Ronald Raulefs

{"title":"VDES R-Mode performance analysis and experimental results","authors":"Markus Wirsing, Armin Dammann, Ronald Raulefs","doi":"10.1002/sat.1424","DOIUrl":"10.1002/sat.1424","url":null,"abstract":"<p>Global Navigation Satellite Systems (GNSS) have become an essential part of maritime navigation, in particular to improve situational awareness and vessel traffic management. The dependence on GNSS creates vulnerability for maritime shipping. Driven by this vulnerability, the desire for a backup system for maritime navigation has been emerging. The VHF Data Exchange System (VDES) standard provides communication capabilities for maritime applications. VDES is currently being revised. As part of this revision, VDES will be extended by ranging and navigation functionalities, called R-Mode, as an alternative for maritime navigation. In this paper, we address system design aspects and evaluate the positioning performance of VDES R-Mode. We derive estimation theory bounds on the accuracy of VDES R-Mode distance and velocity. In a case study, we discuss and evaluate the benefit of satellite links to complement VDES R-Mode positioning. Furthermore, we introduce a Kalman filter for position and velocity tracking, which we apply to experimental data. We describe an experiment we conducted at Lake Ammer, southwest of Munich, and evaluate the VDES R-Mode positioning performance for this setup. Our experimental results show that VDES R-Mode is capable of achieving a 95th-percentile horizontal position error of 22 m. Thus, VDES R-Mode is a promising approach for a maritime backup system that can meet the IALA accuracy requirements.</p>","PeriodicalId":50289,"journal":{"name":"International Journal of Satellite Communications and Networking","volume":"41 2","pages":"158-177"},"PeriodicalIF":1.7,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/sat.1424","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42007701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3