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Physics in Airplane's Radar
Transcript of Physics in Airplane's Radar
Duplexer switches magnetron through to antenna.
Antenna acts as transmitter, sending narrow beam of radio waves through the air.
Radio waves hit the airplane and reflect back.
Antenna picks up reflected waves during a break between transmissions.
Duplexer switches antenna through to receiver unit
Computer in receiver unit processes reflected waves and draws them on a screen
The plane shows up on the radar with any other nearby targets.
*Magnetron: an electron tube for generating microwaves, with the flow of electrons controlled by an external magnetic field
*Duplexer: a device that allows bi-directional communication over a single path
Physics in Airplane's Radar
How does it work?
> Physics Classroom
Air traffic control uses radar to track planes and see where they are both on the ground and in the air.
Radio waves travel fast enough to go seven times around the world in a second.
At one point the plane sends signals and for the rest of the time listens out for any reflections of that signal from close distance objects. Planes know something is nearby when reflections are detected and can use the time taken for the reflections to arrive and figure out the distance of where the plane is.
The radio waves used by radar are produced by the magnetron. The waves a magnetron produces are actually microwaves, like the ones generated by a microwave. The difference is that the magnetron in a radar has to send the waves farther, making it larger and powerful.
The radio waves used by radar are produced by something called a magnetron. The waves a magnetron produces are actually microwaves, similar to the ones generated by a microwave oven. The difference is that the magnetron in a radar has to send the waves many miles, instead of just a few inches, so it is much larger and more powerful.
Radar stands for:
RAdio Detection And Ranging
An antenna, working as a transmitter, hurls radio waves into the air in front of it. Radar antennas typically rotate so they can detect movements over a large area.
What is radar?
Radar is an object-detection system that uses radio waves to determine the range, altitude, direction, and the speed of certain objects, like the detection of airplanes, ships, spacecrafts, cars, weather, and terrain.
Its antenna transmits pulses of radio waves or microwaves that bounce off any object in their path, it can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The object returns a tiny part of the wave's energy to the antenna that is usually located where the transmitter is at.
1. Magnetron generates high-frequency radio waves.
2. Duplexer switches magnetron through to antenna.
3. Antenna acts as transmitter, sending narrow beam of radio waves through the air.
4. Radio waves hit the airplane and reflect back.
5. Antenna picks up reflected waves during a break between transmissions.
6.Duplexer switches antenna through to receiver unit.
7. Computer in receiver unit processes reflected waves and draws them on a screen.
8. The plane shows up on the radar with any other nearby targets.