By Dr. Erich Lutz, Markus Werner, Dr. Axel Jahn (auth.)
Das Buch gibt einen fundierten Überblick über aktuelle und zukünftige Satellitensysteme für Mobilkommunikation (personal conversation) und Breitbandkommunikation. In Teil I werden die Grundlagen von geostationären und nichtgeostationären Satellitenkonstellationen sowie die damit verbundenen nachrichtentechnischen Fragen behandelt. Teil II befaßt sich mit den Satellitensystemen für Mobilkommunikation und behandelt verschiedene Netzaspekte (CDMA, Spotbeams, Routing, etc.) sowie die Technologie, Regulierung und Finanzierung solcher Systeme. Teil III ist den zukünftigen Satellitensystemen für breitbandige Kommunikation (Internet, Multimedia) gewidmet und beleuchtet die satellitenspezifischen Aspekte dieser Kommunikation, insbesondere auf der foundation von ATM und TCP/IP. Ein umfangreicher Überblick über operationelle und geplante Satellitensysteme rundet das Buch ab.
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Satellite Systems for Personal and Broadband Communications
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6° the orientation of the semi-major axis remains constant. These inclination angles are thus of special interest for satellite orbits. 6°. Other causes of orbit perturbations are the gravitation of the sun and the moon, solar radiation pressure, atmospheric drag (effective up to 750 km altitude [Ric99]), and distortions due to the satellite propulsion. 6 Ground Tracks This section derives the time-variant coordinates of a satellite position. First, we want to introduce coordinate systems that allow us to relate the satellite's position to spherical or Cartesian geocentric coordinates, cf.
50 Mio. 40-50 Mio. 3. Signal Propagation and Link Budget This chapter deals with various phenomena occurring when a signal propagates between a satellite and a user terminal. The basic effect is signal attenuation due to free space loss. Since the attenuation increases with distance it is especially severe in the satellite scenario. Together with the antenna characteristics of the transmitter and receiver, the attenuation determines the required transmission power to achieve a reliable signal transmission.
Important parameters are: - the elevation angle E: at which a user can see the satellite above the horizon, - the nadir angle {} that gives the deflection of the user from nadir as seen from the satellite, - the earth central angle 'ljJ between the sub-satellite point SSP and the user, and - the slant range d denoting the distance between the user terminal and the satellite. 23) . 25) The slant range d can be calculated from d = JR~ + r2 - 2Rercos'IjJ . 26) Dependency of Nadir, Elevation, and Earth Central Angle from Geographic Coordinates.