A satellite is located at 100 west longitude in the geosynchronous orbit. The transmitting ground…
A satellite is located at 100 west longitude in the
geosynchronous orbit. The transmitting ground station is located at 100 east
longitude and 300 north latitude, and the receiving ground station is located
at 330 east longitude and 400 north latitude. The uplink and downlink
frequencies are 12GHz and 10GHz, respectively. All antennas are 3 m in diameter
with 65% aperture efficiencies. Ignoring atmospheric absorption and noting that
the transmission bandwidth in the downlink and the uplink are the same, the
overall C/N ratio may be expressed in terms of the uplink and downlink
carrierto-
A satellite is located at 100 west longitude in the
geosynchronous orbit. The transmitting ground station is located at 100 east
longitude and 300 north latitude, and the receiving ground station is located
at 330 east longitude and 400 north latitude. The uplink and downlink
frequencies are 12GHz and 10GHz, respectively. All antennas are 3 m in diameter
with 65% aperture efficiencies. Ignoring atmospheric absorption and noting that
the transmission bandwidth in the downlink and the uplink are the same, the
overall C/N ratio may be expressed in terms of the uplink and downlink
carrierto-noise ratios as
a. Use (3.67) to determine the uplink and downlink ranges to
the satellite.
b. Find the uplink and downlink carrierto-noise ratios so as
to give an overall C/N ratio of 20 dB in a transmission bandwidth of 10 MHz.
The G/T of satellite and ground-station receive antennas are 4 dB and 7 dB,
respectively.
c. Using the C/N values for the uplink and downlink of part
(a), determine the transmit powers for the ground station and the satellite
