Future Ku-Band Mobility Satellites

McLain, Christopher; King, J. H.

doi:10.2514/6.2017-5412

Cited by 6 publications

(7 citation statements)

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“…The research related to the new LEO proposals is scarce and has focused on analyzing debris and impact probabilities [14,15], as well as comparing the qualities of LEO and GEO systems in serving maritime and aeronautical users [16]. In particular, Le May [14] studied the probability of collision for SpaceX and OneWeb satellites operating in the current LEO debris environment, while Foreman [15] provided several policy recommendations to address orbital debris concerns after analyzing the number of encounters between satellites and space debris.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In particular, Le May [14] studied the probability of collision for SpaceX and OneWeb satellites operating in the current LEO debris environment, while Foreman [15] provided several policy recommendations to address orbital debris concerns after analyzing the number of encounters between satellites and space debris. Finally, McLain [16] compared the two aforementioned systems against multiple geostationary, very-high-throughput satellites, and concluded that the latter offer a simpler, less risky, and more economical path to providing large for the aeronautical and maritime industries. This paper adopts a similar approach as Evans [10] to compare the proposals of OneWeb, Telesat, and SpaceX.…”

Section: Literature Reviewmentioning

confidence: 99%

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A technical comparison of three low earth orbit satellite constellation systems to provide global broadband

2019

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

A technical comparison of three low earth orbit satellite constellation systems to provide global broadband

2019

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“…A variety of uncertainties exist in the complex Ka-band HTS systems including signal propagation channel conditions from a user terminal to satellite, the channel noise, and the varying co-color interference (CCI) power levels. The uncertainties also differ under different system architectures or configurations [2]. They affect the system performance and are studied using probability and statistics before a complex HTS system is constructed.…”

Section: Introductionmentioning

confidence: 99%

“…The current HTS systems are dominantly geostationary systems for its many advantages [2]. The distinct disadvantage of a HTS system is its many co-color interferers (CCIs) resulted from the color reuse.…”

Section: Introductionmentioning

confidence: 99%

Ka-Band HTS System User Uplink SNIR Probability Models

Ai¹,

Helgert²

2018

Broadband Communications Networks - Recent Advances and Lessons From Practice

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Ka-band High-throughput-satellite (HTS) systems reuse frequency bands in spot beams for much higher system capacity and better spectrum efficiency. They however are prone to intra-system co-color interference and so suffer from the channel signal-to-noise-plusinterference ratio (SNIR) degradation. This chapter presents the development of the uplink SNIR probability models for Ka-band spot beam HTS systems. The models are applicable to different Ka-band propagation channel conditions of statistical significance. Its use of collective representation to model traffic variation of co-color beams captures the statistics of traffic variation and allows feasibility and variety of use case representation. The analytical approach complements known studies and fills in the blank of the use cases of urban and mobile users. The models can be used for system design performance estimation and prediction. It features computation time and memory savings in numerical implementation.

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“…and Telesat [3]. As opposed to geostationary spacecraft, a LEO satellite cannot stay always pointed towards a fixed spot on Earth.…”

mentioning

confidence: 99%

An adaptive groundtrack maintenance scheme for spacecraft with electric propulsion

et al. 2020

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In this paper, the repeat-groundtrack orbit maintenance problem is addressed for spacecraft driven by electric propulsion. An adaptive solution is proposed, which combines an hysteresis controller and a recursive least squares filter. The controller provides a pulse-width modulated command to the thruster, in compliance with the peculiarities of the electric propulsion technology. The filter takes care of estimating a set of environmental disturbance parameters, from inertial position and velocity measurements. The resulting control scheme is able to compensate for the groundtrack drift due to atmospheric drag, in a fully autonomous manner. A numerical study of a low Earth orbit mission confirms the effectiveness of the proposed method.

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Future Ku-Band Mobility Satellites

Cited by 6 publications

References 1 publication

A technical comparison of three low earth orbit satellite constellation systems to provide global broadband

A technical comparison of three low earth orbit satellite constellation systems to provide global broadband

Ka-Band HTS System User Uplink SNIR Probability Models

An adaptive groundtrack maintenance scheme for spacecraft with electric propulsion

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