61. In the radar guidance of missiles where the missile has its own radar and its extracts the tracking data from the target reflected energy, the technique is known as
62. For a GEO satellite, what is the free space loss (Ldb) at the equator in terms of carrier wavelength (λ)?
63. In a satellite ground station, the received signal is directly amplified in a low noise parametric amplifier followed by a FET amplifier. The gains and effective noise temperatures of the amplifiers are 20 dB, 9.0 K and 10 dB, 200 K respectively. The effective noise temperature of the combination is
64. Energy required for satellite is generally derived from
65. The uplink and downlink frequencies are made different in satellite links in order to
66. Linear velocity of a satellite equals
Where G(Gravity constant) = 6.67 × 10-11m3/kg-sec, M = mass of earth, r = radius of circular orbit
Where G(Gravity constant) = 6.67 × 10-11m3/kg-sec, M = mass of earth, r = radius of circular orbit
67. For satellite communication, the frequency should be-
68. A highly inclined and highly eccentric orbit used by majority of communication satellites launched by Russia is also known as
69. In . . . . . . . . switching a dedicated link/path is established across the sender and the receiver which is maintained for the entire duration of conversation?
70. The orbital period of a satellite in circular orbit of radius R from the centre of the earth, is proportional to:
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