Shannon Wireless’ Post

This paper provides the first, fundamental analysis of #Radio #Frequency #Interference (#RFI) that #large-#scale #terrestrial #deployments introduce in different satellite sensing systems now orbiting the Earth. They develop a #geometry-#based #analysis and #extend it into a #data-#driven model which accounts for realistic propagation, building obstruction, ground reflection, for network topology with up to 10^5 nodes in more than 85 km ^2. They show that the presence of #harmful #RFI depends on several factors, including #network #load, #density and #topology, #satellite #orientation, and #building #density.----Paolo Testolina, Michele Polese, Josep Miquel Jornet, Tommaso Melodia, @Michele Zorzi More details can be found at this link: https://lnkd.in/en-jbpXd

The first objective of this work is the design of #swarm-#based #antenna #arrays, in which the impact of key parameters such as the number of satellites in the swarm, their reciprocal distance and the array geometry, is thoroughly analyzed. It is shown that the undesired phenomenon of grating lobes can be mitigated via optimized array geometries and a new geometry named the #enhanced #logarithmic #spiral #array (#ELSA) is presented. The second objective of this work is the identification of the most important research directions and system design aspects for the #swarm #system. In particular, it is shown that tethered swarms with ELSA geometries, innovative deployable structures and very small satellites can foster the deployment of swarms in future satellite systems. ---- Diego Tuzi, Thomas Delamotte, Andreas Knopp More details can be found at this link: https://lnkd.in/eAEKtfcK

This paper presents a #novel #methodology for addressing the #Satellite #Routing# problem, specifically tailored for modern constellations to maximize capacity while effectively mitigating self-interference through the use of #Integer #Optimization. By combining this method with established #Frequency #Assignment #techniques, the results demonstrate an increase in throughput of up to 138% for constellations such as #SpaceX #Starlink. Notably, the study reveals that relying on individual approaches to tackle interference may lead to undesired outcomes, underscoring the advantages of a cooperative framework. ----Nils Pachler de la Osa, Ed Crawley, @Bruce G. Cameron More details can be found at this link: https://lnkd.in/ez54dj4D

Infrastructure monitoring has reached new levels of technology and altitude! Researchers at Texas A&M University are harnessing Synthetic Aperture Radar (SAR) technology to detect infrastructure issues early on. This satellite technology allows researchers to inspect and characterize pavements, retaining walls, and embankments from space and can help determine structural flaws. This method is both cost and time efficient so it can be a game-changer for organizations looking to manage assets. What do you think could be the difficulties using this method? #majidiranikhah #EngineeringInnovation #InfrastructureMonitoring #SARTechnology

This paper attempts to provide an initial assessment of the feasibility and potential gains of #adaptive #wideband #cellular #systems operating across the upper mid-band. The study includes: (1) a detailed ray tracing simulation to assess potential gains of multi-band systems in a representative dense urban environment and illustrate the value of a wideband system with dynamic frequency selectivity; (2) an evaluation of potential cross-interference between satellites and terrestrial cellular services and interference nulling to reduce that interference; and (3) design and evaluation of a compact multi-band antenna array structure. Leveraging these preliminary results, we identify potential future research directions to realize next-generation systems in these frequencies. ---- Seongjoon Kang, Marco Mezzavilla, Sundeep Rangan, Arjuna Madanayake, Satheesh Bojja Venkatakrishnan, Grégory Hellbourg, Monisha Ghosh, Hamed Rahmani, Aditya Dhananjay More details can be found at this link: https://lnkd.in/eRKpiu3R

This article presents an in-depth satellite-to-ground #quantum #key #distribution (#QKD) feasibility analysis between a #low #Earth #orbit (#LEO) satellite and a 0.28-m small-sized #optical #ground #stations (#OGSs) located in urban areas, over night time. Both #prepare-#and-#measure (#P & #M) and #entanglement (#ENT)-based QKD protocols are employed and compared in terms of distilled key bits. The performance of various detection setups and environmental conditions including different wavelengths (1550 and 810 nm) as well as different types of detectors (avalanche and superconducting nanowires) is simulated. ---- Argiris Ntanos, Nikolaos Lyras, Aristeidis Stathis, Giannis Giannoulis, Athanasios D. Panagopoulos, Hercules Avramopoulos More details can be found at this link: https://lnkd.in/eT-gd5cY

This study measures the relative permittivity of land and seawater by using a low-cost and low-complexity #dual #circularly #polarized #reception (#DCPR) system. This system consists of a custom, phase stable, #dual #circularly #polarized #antenna (#DCPA) and off-the-shelf receivers for simultaneous reception of direct and reflected #global #navigation #satellite #system (#GNSS) signals. DCPR offers two distinct improvements in comparison to the dual linear polarization reception. First, the DCPR system enables two low-correlation data streams due to the utilization of GNSS polarization and its orthogonal counterpart. Second, it enables easy observation of the surface scattering characteristics through the behavior of the reflected cross-polarized #carrier-#to-#noise #density #ratio (C/N0). ----Ankit Regmi, @Marko E. Leinonen, Aarno Parssinen, @Markus Berg More details can be found at this link: https://lnkd.in/g_bt4jqn

Do you know what to look for when dealing with regional ionospheric scintillation? Within your visualisation software, like Quantum, you can see rapid signal tracking fluctuations that look like a flickering effect on graphs. The impact of ionospheric scintillation is that your positioning solution may no longer be reliable. Learn more about using Quantum software to observe GNSS and scintillation >> https://hxgn.biz/3ydpK5N #Scintillation #ionosphere #interference #GNSS #SolarCycle25 #multifrequency #multiconstellation

Do you know what to look for when dealing with regional ionospheric scintillation? Within your visualisation software, like Quantum, you can see rapid signal tracking fluctuations that look like a flickering effect on graphs. The impact of ionospheric scintillation is that your positioning solution may no longer be reliable. Learn more about using Quantum software to observe GNSS and scintillation >> https://hxgn.biz/3ydpK5N #Scintillation #ionosphere #interference #GNSS #SolarCycle25 #multifrequency #multiconstellation

My “Satellite Telecommunications and Earth Observation Deep Dive” presentation to the IEEE Computer Society Phoenix on 12/11/24 is available to view & download on SlideShare at https://lnkd.in/g7hXVTNN FYI. The presentation explores the revolution in launch capabilities and capacities as well as cutting-edge technologies such as SmallSats, Low Earth Orbit (LEO) constellations, the rise of satellite Direct to Device (D2D) mobile 5G integration, and innovations in remote sensing and analysis.