Coverage performance is an important index to evaluate the reliability and stability of the service provided by the megaconstellation. Different from traditional constellations, mega-constellation has a large number of satellites distributed in several different orbital planes, which leads to a sharp increase in the calculation amount of traditional coverage performance analysis methods. In this paper, the position of the satellite is deduced by TLE (Two-Line Elements) data and SGP4 (Simplified General Perturbations Satellite Orbit Model 4) model. Then, a multi-precision method for dividing grid points is proposed, which is different from the traditional method of dividing grid points at equal intervals. The longitude interval is set according to the latitude in the method, so as to avoid the excessive division of longitude in the high latitude region. Meanwhile, the selection of grid points near the 180° longitude line is optimized in view of the characteristics of the coincidence of the 180° east-west longitude line. On this basis, an improved visibility function model is constructed which comprehensively considers the beamwidth of satellite antenna and the minimum elevation angle of grid point to analyze the coverage performance of mega-constellation, overcoming the problem that the traditional visibility function model cannot consider the restriction of the beamwidth of satellite antenna to the coverage performance. Finally, this paper takes OneWeb constellation as an example to analyze the proposed method, and compares it with the traditional method. The simulation results show that the proposed method can greatly reduce the computational complexity while ensuring the accuracy of the calculation results.
The imperative of addressing the growing need for enhanced capacity, efficiency, and rapid communication in space networks has emerged as a critical subject within contemporary communication technology. This paper presents a novel approach, referred to as the lightweight satellite-borne terahertz (THz) communication space information-centric network (LSICN), which aims to effectively utilize the efficient transmission benefits of the information-centric network (ICN) and accommodate the specific attributes of high-speed, high-capacity communication in THz networking. This study provides an overview of essential technologies that address the aforementioned difficulties. These technologies encompass THz channel modeling, network topology reconstruction, lightweight routing techniques, and lightweight robust access control. Finally, several developmental directions for the LSICN are discussed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.