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Accuracy assessment of Geostationary-Earth-Orbit with simplified perturbations models

Ma L., Xu X., Pang F.

Artificial Satellites : Journal of Planetary Geodesy

2016

Vol. 51, No. 2

55--59

A two-line element set (TLE) is a data format encoding orbital elements of an Earth-orbiting object for a given epoch. Using suitable prediction formula, the motion state of the object can be obtained at any time. The TLE data representation is specific to the simplified perturbations models, so any algorithm using a TLE as a data source must implement one of these models to correctly compute the state at a specific time. Accurately adjustment of antenna direction on the earth station is the key to satellite communications. With the TLE set topocentric elevation and azimuth direction angles can be calculated. The accuracy of perturbations models directly affect communication signal quality. Therefore, finding the error variations of the satellite orbits is really meaningful. In this present paper, the authors investigate the accuracy of the Geostationary-Earth-Orbit (GEO) with simplified perturbations models. The coordinate residuals of the simplified perturbations models in this paper can give references for engineers to predict the satellite orbits with TLE.

The role of Geostationary Earth Orbit communication satellites in Chinese Area Positioning System

Ma L.

Artificial Satellites : Journal of Planetary Geodesy

2014

Vol. 49, No. 3

151--159

The Chinese Area Positioning System (CAPS) is an area positioning system based on Geostationary Earth Orbit (GEO) communication satellites. Transponders on the satellites are used to retransmit navigation message and ranging signals generated from the ground master station, while users receive navigation signals to perform navigation and positioning tasks. Meanwhile, CAPS also develops bidirectional communication receivers using abundant transponders resources on Slightly Inclined Geostationary Orbit (SIGSO) communication satellites, thus realizing integration of navigation and communication in the coverage region.

Stan aktualny i rozwój systemu COSPAS-SARSAT

Czajkowski J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

2012

nr 11

1633-1636

Przedstawiono aktualny status systemu COSPAS-SARSAT, jego segment kosmiczny składający się z satelitów krążących na niskoorbitalnych biegunowych orbitach (LEO) i satelitów umieszczonych na orbicie geostacjonarnej (GEO) oraz segment naziemny, który składa się z lokalnych stacji odbiorczych - LUT i centrów sterowania systemem MCC. Zaprezentowano również aktualny stan rozwojowy przy wprowadzeniu do systemu COSPAS-SARSAT satelitów usytuowanych na średnich orbitach okotoziemskich - MEO.

The article presents actual status on the Cospas-Sarsat System induding system operation, space segment: Low-altitude Earth Orbit (LEO) and Geostationary Earth Orbit (GEO), ground segment consists of the Local User Terminals (LlTTs) and Mission Control Centres MCCs. Status of the MEOSAR (Medium Earth Orbit SAR) and system development have been presented.