نتایج جستجو برای: geostationary satellite

تعداد نتایج: 80742  

Journal: :IEICE Electronic Express 2011
Alberto Reyna Marco A. Panduro Carlos del Rio-Bocio

The design of concentric ring arrays for isoflux radiation is reported in this paper. This design considers the reduction of the side lobe level and the isoflux radiation requirements for Geostationary Earth Orbit (GEO) satellites. The optimization problem considers the spacing between rings and the levels of amplitude excitations. The wellknown method of Particle Swarm Optimization (PSO) is ut...

2003
Jaume Sanz Xavier Prats

The EGNOS System Test Bed (ESTB) is the EGNOS prototype which has been broadcasting a Signal in Space since February 2000. Accuracy, integrity, continuity and availability are the main concepts in this European component of the Satellite Based Augmentation System which is designed to support en route through precision approach aircraft navigation. In this work, for the first half of the year of...

2017
Aleš Filip

It is generally believed that exploitation of Global Satellite Navigation Satellite System (GNSS) together with advanced mobile communications for signalling and train control will significantly improve safety and efficiency of railway operations. This is especially true for signalling solutions on low traffic lines and also on some long heavy haul lines where previously planned implementations...

2013
G. Masiello C. Serio I. De Feis M. Amoroso S. Venafra I. F. Trigo

The high temporal resolution of data acquisition by geostationary satellites and their capability to resolve the diurnal cycle allows for the retrieval of a valuable source of information about geophysical parameters. In this paper, we implement a Kalman filter approach to apply temporal constraints on the retrieval of surface emissivity and temperature from radiance measurements made from geos...

2002
David Howe

The NBS Boulder Laboratory is in the process of assembling a very high accuracy time transfer system. The system includes a 6.1 meter Ku-band satellite earth station, two transportable earth stations each with a 1.8 meter dish, and commercial modems designed for two-way timing. Elements of the facilities are described in this paper. High-accuracy timing with this equipment using the two-way tim...

2014
Aaron Pearlman Raju Datla Raghu Kacker Changyong Cao

International scientific standards organizations created standards on evaluating uncertainty in the early 1990s. Although scientists from many fields use these standards, they are not consistently implemented in the remote sensing community, where traditional error analysis framework persists. For a satellite instrument under development, this can create confusion in showing whether requirement...

Journal: :European Journal of Operational Research 2008
Vassilis F. Milas Demosthenes Vouyioukas Nektarios Moraitis Philip Constantinou

A new network has been recently proposed for the provision of fixed broadband services via high altitude platform stations (HAPS) in the 48/47 GHz band. One of the critical issues of this technology is spectrum sharing with the fixed satellite service. This paper examines the effect of Earth-to-stratosphere co-channel interference produced by ground stations of HAPS network to geostationary orb...

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