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
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.
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
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
Consider the following statements relating to communication satellite systems:
1. The geosynchronous orbits of the satellites are in the earth's meridional plane.
2. It is not necessary to incorporate a very low noise amplifier in the satellite as the noise temperature of the satellite antenna will be high.
3. The total delay on one round trip is about one quarter of a second which is near the limit of satisfactory two - way telephone communication.
Select correct answer out of these statements
A receiving antenna with a gain of 40 dB looks at a sky with a noise temperature of 15 K. The loss between the antenna and LNA input due to the feed horn is 0.4 dB, and the LNA has a noise temperature of 40 K. The G/T value is
