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Current trend in telecommunications is “broadband” and “ubiquitous.” To achieve this goal, satellite communications systems are expected to play an important role in cooperation with terrestrial communications systems. Along with the advancement of optical fiber transmission systems, the role of satellite communications was dramatically changed from long distance transmission to various applica...

this paper focuses upon the development of an efficient method for conceptual design optimization of a satellite. there are many option for a satellite subsystems that could be choice, as acceptable solution to implement of a space system mission. every option should be assessment based on the different criteria such as cost, mass, reliability and technology contraint (complexity). in this rese...

Frequencies above 10 GHz are of primary importance in current satellite systems. In this paper, an analytical model is presented for the prediction of the adjacent satellite interference, cross-polarization and ice depolarization effects on channel capacity statistics of a dual polarized satellite link. As source of the aggravation of the adjacent satellite interference is considered here the p...

Remote sensing satellite data are vast, various, time sensitive and with wide users. How to delivery satellite data and products to users effectively is an important problem facing satellite department. Blueprint has been widely applied in improving service process. It’s a useful method to optimize allocation of resources and improve service quality. This article analyzes the service process of...

TO THE EDITOR: We thank Snijders et al. (5) for raising important questions worthy of further discussion. In our study, 14 days of bed rest induced robust myofiber atrophy and muscle weakness that was accompanied by a reduction in satellite cell content (1). Individual changes in satellite cell quantity were significantly correlated with the decline in myofiber cross-sectional area after bed re...

Remote sensing has changed modern oceanography by proving synoptic periodic data which can be processed. Since the satellite data are usually too much and nonlinear, in most cases, it is difficult to distinguish the patterns from these images. In fact, SOM (Self-Organizing Maps) model is a type of ANN (Artificial Neural Network) that has the ability to distinguish the efficient patterns from th...

Image Quality of spacecraft sensors vary between ground pre-launch measure, after launch and over satellite lifetime due to launching vibration and space harsh environment. Due to the inaccessibility of the satellite on orbit, it is mandatory to use indirect method in order to estimate satellite performances. The aim of this work is to estimate the Image Quality of satellite by using the sharp ...

Satellite ground track display computer program is designed and implemented for the KOMPSAT-2 mission operations. Digitized world map and detailed Korean map is realized with zoom and pan capability. The program supports real-time ground trace and off-line satellite image planning on the world map. Satellite mission timeline is also displayed with the satellite ground track for the visualized m...