21. A satellite is orbiting in the equatorial plane with a period from perigee to perigee of 12 h. If the eccentricity = 0.002, i = 0°, K1 = 66063.17 km2, µ = 3.99 × 1014 m3/s2 and the earth's equatorial radius = 6378.14 km, the semi-major axis will be
22. A monostatic pulsed radar operating at 30 GHz has a transmitter with 2 KW O/P power and an antenna with 30 dB gain. Minimum detectable signal in the receiver is -100 dBm. Determine the maximum range of the radar, if it is required to detect a target having radar cross section of 10 sq.m (consider log104π = 1.1).
Assume EM wave propagate under ideal conditions.
Assume EM wave propagate under ideal conditions.
23. Tropospheirc scatter communication is used for which frequency band?
24. The frequency range for satellite communication is
25. One of the following satellite system being used for weather forecast application:
26. A satellite link frequency is expressed as $$\frac{4}{6}$$ GHz. It means that
27. Ionosphere propagation is not possible for microwaves because
28. What does a link budget for satellite communication include?
29. A company operating taxicabs communicates from its central office with the help of an antenna at the top of a 16 m tower. The antenna on the taxicabs is 1.44 m above the ground. The communication distance between the central office and a taxicab cannot exceed
30. In the radar guidance of missiles, the technique makes use of two separate tracking beams, one tracking the missile and the other tracking the target. The missile is commanded to follow a trajectory based on the data from the two tracking radar beams. It is
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