The division in groups even-odd channels on repeater equipment for satellite receivers:
a / Make a separator on a frequency, reducing interference between adjacent channels
b / receiver Makes effective use of power LNA amplifier
c / Making the separation of time, reducing crosstalk characters (ISI)
d / Easy for fabrication of channel amplifiers used in the receiver
/ Conditions for a communications satellite Information can cover up to 1/3 of the earth's surface:
a / Satellite flying in orbit LEO and the angle from satellites is 17:10
b / Satellite MEO orbit and fly in with a defensive perspective Crystal is 17:40
c / Satellite flying in orbit HEO and with views from satellites is 17:40
d / Satellite in orbit GEO fly and with views from satellites is 17:40
Main Features of the orbit GEO (geostationary) :
a / A circular orbit, orbital plane coincides with the equatorial plane, flying satellites orbit in the same direction and with the same angular velocity of rotation of the earth around its axis.
b / A circular orbit, orbital plane perpendicular to the equatorial plane, flying satellites orbit in the same direction and with the same angular velocity of rotation of the earth around its axis.
c / Being elliptical orbits, orbital plane coincides with the surface equatorial plane, flying satellites orbit in the same direction and with the same angular velocity of rotation of the earth around its axis.
d is elliptical orbits, orbital plane coincides with the equatorial plane, the satellite in orbit but flying in the opposite direction with the same angular velocity of rotation of the earth around its axis.
The system is VSAT satellite communication:
a / satellite communication system with terminals using antennas are smaller
b / satellite communication system with satellite control stations using antennas are smaller
c / satellite communication system with large transmission power level
d / satellite communication system using antennas have high gain coefficient
VSAT satellite communication network has several configurations:
a / Network star, mesh network
b / Networking shaped string, mesh network
c / mesh network, network Ring
d / Network star, Ring Network
Organization VSAT network Star configuration has advantages:
a / Latency small, economical, reduce network construction costs
b / Latency little, small transmission losses, reduce network construction costs
c / Allow Management Management, monitoring and control are all first VSAT remote station
d / Allow drivers to connect to all remote stations first VSAT
network Organization VSAT network configurations have advantages:
a / small delay time , good economy, reduce network construction costs.
b / Allowing management, monitoring and control are all first VSAT remote station.
c / Allowing drivers to connect to all of the first VSAT station away.
d / small time delay, loss less transmission without flow control.
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