With the upcoming launch of large constellations satellites in low-Earth orbit (LEO) region, it will become important to organize physical space occupied by different operating order minimize critical conjunctions and avoid collisions. This paper introduces definition occupancy as domain an individual satellite moves along its nominal under effects environmental perturbations throughout a given...

We characterize the parameters of the flowing argon plasma produced by a 16-cmdiameter plasma source utilizing a transverse magnetic filter to reduce electron temperature while maintaining the quasineutrality of the flowing plasma, as a function of the operating parameters of the source: discharge voltage, discharge current, and gas flow rate/neutral background pressure. We evaluate the plasma ...

Abstract To solve the problem of low Earth orbit (Leo) satellite constellation link spread spectrum signal acquisition in high dynamic weak environment, this paper proposes a strategy based on transfer model. In paper, we analyze characteristics signal. An improved method parallel code phase search model is introduced, improvement proposed to traditional algorithm illustrated through theoretica...

This letter investigates the accuracy of recently proposed stochastic geometry-based modeling low earth orbit (LEO) satellite networks. In particular, we use Wasserstein Distance-inspired method to analyze distances between different models, including Fibonacci lattice and models. We propose an algorithm calculate distance generated point sets. Next, test algorithm’s performance geometry model ...

In this paper, we investigate the effect of strong time-varying transmission distance on performance low-earth orbit (LEO) satellite-terrestrial (STT) system. We propose a new analytical framework using finite-state Markov channel (FSMC) model and time discretization method. Moreover, to demonstrate applications proposed framework, performances two adaptive transmissions, rate-adaptive (RAT) po...

Communication with Low-Earth Orbit (LEO) satellites requires the set up of a ground station which is a complex and costly installation. Moreover, a LEO satellite is accessible only during certain time slots from a given ground station. In other words, access to LEO satellites is on an intermittent basis and is constrained by the availability of ground stations. The work presented in this paper ...

The International Academy of Astronautics has established, under the aegis of its “Human Spaceflight Coordinating Group” (HSFCG), a series of Cosmic Studies aimed at identifying a set of requirements for future human missions to Mars, within the context of future, global, cooperative scenarios. Among these, Cosmic Study SG 3.19/1.10 which is introduced in the present paper, considers the variou...

Traditional Global Navigation Satellite System (GNSS) immunity to interference may be approaching a practical performance ceiling. Greater gains are possible outside traditional GNSS orbits and spectrum. from low Earth orbit (LEO) has long been viewed as promising but expensive, requiring large constellations for rapid navigation solutions. The recent emergence of commercial broadband LEO mega-...

Multi-spectral data from the MODerate resolution Imaging Spectroradiometer (MODIS) onboard the Terra spacecraft are used to derive cloud optical thickness and effective particle radius using the algorithm of Nakajima and Nakajima (1995). Microphysical cloud properties are retrieved during strong aerosol events from biomass burning to better understand the actual effects of cloud-aerosol interac...

To meet an ever-growing demand for wideband multimedia services and electronic connectivity across the world, development of ubiquitous broadband multimedia systems is gaining a tremendous interest at both commercial and academic levels. Satellite networks will play an indispensable role in the deployment of such systems. A significant number of satellite communication constellations have been ...