Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

Apoorva,; Bitragunta, Sainath; Nitundil, Sumukh

doi:10.1049/iet-com.2020.0515

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Fortunately, suitable optical/millimeter-wave downlinks can provide attractive bandwidths catering to high rates of data transfers. Similar data exchanges can be considered also between our satellites (e.g., Apoorva et al (2020), and references therein), which would facilitate on-board computations, including cross-correlation, enabling allowed level of time integration of visibilities to reduce data size, and thus, easing the data rate requirements for the downlinks. While this would facilitate desired immediate local checks on quality of interferometric data, the entire raw voltage data download would remain the preferred mode to enable detailed and sophisticated processing and refinements.…”

Section: Discussionmentioning

confidence: 99%

A Minimal Space Interferometer Configuration for Imaging at Low Radio Frequencies

Jaini,

Deshpande,

Bitragunta

2021

Preprint

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The radio sky at lower frequencies, particularly below 20 MHz, is expected to be a combination of increasingly bright non-thermal emission and significant absorption from intervening thermal plasma. The sky maps at these frequencies cannot therefore be obtained by simple extrapolation of those at higher frequencies. However, due to severe constraints in ground-based observations, this spectral window still remains greatly unexplored. In this paper, we propose and study, through simulations, a novel minimal configuration for a space interferometer system which would enable imaging of the radio sky at frequencies well below 20 MHz with angular resolutions comparable to those achieved at higher radio frequencies in ground-based observations by using the aperture-synthesis technique. The minimal configuration consists of three apertures aboard Low Earth Orbit (LEO) satellites orbiting the Earth in mutually orthogonal orbits. Orbital periods for the satellites are deliberately chosen to differ from each other so as to obtain maximum (u, v) coverage in short time spans with baselines greater than 15000 km, thus, giving us angular resolutions finer than 10 arcsec even at these low frequencies. The sensitivity of the (u, v) coverage is assessed by varying the orbit and the initial phase of the satellites. We discuss the results obtained from these simulations and highlight the advantages of such a system.

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Section: Discussionmentioning

confidence: 99%

A Minimal Space Interferometer Configuration for Imaging at Low Radio Frequencies

Jaini,

Deshpande,

Bitragunta

2021

Preprint

Self Cite

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“…Unlike satellite-terrestrial links, the impact of the multipath effect in the ground clutter layer and rain attenuation in the atmosphere on inter-satellite links (ISLs) can be neglected [29]. Due to the high mobility of satellites and the application of extremely narrow beams, the small scale fading of the ISL is mainly caused by the pointing error.…”

Section: B Channel Fading Modelmentioning

confidence: 99%

Stochastic Geometry-Based Low Latency Routing in Massive LEO Satellite Networks

Wang

Kishk

Alouini

2022

IEEE Trans. Aerosp. Electron. Syst.

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In this paper, the routing in massive low earth orbit (LEO) satellite networks is studied. When the satellite-tosatellite communication distance is limited, we choose different relay satellites to minimize the latency in a constellation at a constant altitude. Firstly, the global optimum solution is obtained in the ideal scenario when there are available satellites at all the ideal locations. Next, we propose a nearest neighbor search algorithm for realistic (non-ideal) scenarios with a limited number of satellites. The proposed algorithm can approach the global optimum solution under an ideal scenario through a finite number of iterations and a tiny range of searches. Compared with other routing strategies, the proposed algorithm shows significant advantages in terms of latency. Furthermore, we provide two approximation techniques that can give tight lower and upper bounds for the latency of the proposed algorithm, respectively. Finally, the relationships between latency and constellation height, satellites' number, and communication distance are investigated.

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“…The communication among satellites, HAPs (e.g., airships, balloons), UAVs, and terrestrial mobile users can be connected tightly, and the UAV communication can be secured by the blockchain. Hence, blockchain-envisioned UAVs in the SAGIN are useful in many fields, such as supply chain retrospection [48] , product delivery [49] , and smart grids [50] . Motivated by the aforementioned facts, we focus on and discuss blockchain-envisioned UAV applications in the SAGIN and will discuss them in detail.…”

Section: Introductionmentioning

confidence: 99%

Blockchain-Envisioned Unmanned Aerial Vehicle Communications in Space-Air-Ground Integrated Network: A Review

Wang

Zhang

et al. 2021

Intell. and Converged Netw.

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Unmanned Aerial Vehicle (UAV) communications have recently entered a new period of interest, motivated by technological advances and the gradual emergence of the Space-Air-Ground Integrated Network (SAGIN). The current survey aims to capture the use of UAVs in the SAGIN while highlighting the most promising open research topics. The traditional UAV network architecture is not adequate to meet the challenges presented by the SAGIN, and an effective and secure space-air-ground integrated UAV network needs to be constructed. Given its well-distributed management and consensus mechanism, blockchain technology can make up for the deficiency of the traditional UAV network. In this work, we review the role of UAVs in the SAGIN. Then, three applications of the blockchain-envisioned UAV network are introduced through several classifications. Future challenges and the corresponding open research topics are also described.

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Best beam selection and PHY switching policy for hybrid FSO/RF inter‐satellite communication link

Cited by 7 publications

References 15 publications

A Minimal Space Interferometer Configuration for Imaging at Low Radio Frequencies

A Minimal Space Interferometer Configuration for Imaging at Low Radio Frequencies

Stochastic Geometry-Based Low Latency Routing in Massive LEO Satellite Networks

Blockchain-Envisioned Unmanned Aerial Vehicle Communications in Space-Air-Ground Integrated Network: A Review

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