Satellites communicate by using radio waves to send signals to the antennas on the Earth. The antennas then capture those signals and process the information coming from those signals.
Answer: The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points.
The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points. Communications satellites use a wide range of radio and microwave frequencies.
Internet distribution via satellites, particularly GEO satellites, has the following merits: High bandwidth. A Ka-band (20-30 GHz) satellite can deliver throughput at gigabits per second rates.
The major frequency bands used for satellite communication in India are S-band, C-band, Upper Extended C band, Ku band and Ka band. The INSAT/GSAT satellites carry transponders in these bands.
There is less noise with digital signals. > The ionosphere reflects radio waves with frequencies below 30 MHz (30 million hertz), so higher frequencies are needed for satellite communication.
Space waves are used for line of sight communication as well as satellite communication.
What does change at higher frequencies is the antenna beam width, it becomes narrower. Thus, in crowded synchronous orbit, you can space the satellites closer together. You also can get wider bandwidths at higher frequencies.
Why are VHF, UHF, and microwave signals used in satellite communication? Explanation: VHF, UHF, and microwave signals penetrate the ionosphere with little or no attenuation and are not refracted to earth. Lower frequencies undergo total internal refraction and get reflected back to earth.
The following two angles of earth station antenna combined together are called as look angles. Azimuth Angle. Elevation Angle.
15 Computer Science Fields
These motors are frequently used in 90% of the applications all over the world due to reasons like great robustness and reliability. These motors are used in different moving or rotating machines like lifts, fans, grinders, etc.
Answer : Option (a) cuboid is not a regular polyhedron because its vertices are not formed by the same number of faces.
Good KPIs: Provide objective evidence of progress towards achieving a desired result. Measure what is intended to be measured to help inform better decision making. Offer a comparison that gauges the degree of performance change over time.
6 Inexpensive Ways to Stay in Shape
While friction is a general physical expression, vehicle traction can be defined as the friction between a drive wheel and the road surface. “traction is the friction between a drive wheel and the road surface. If you lose traction, you lose road grip.”
Dated : 01-Jun-2022
Category : Education