electronics L1

LESSON 1: SIGNAL TRANSMISSION AND RECEPTION

RADAR (Radio Detection and Ranging)

transmitter and receiver that emits radio waves and processes

their reflections for display and is used especially for

detecting and locating objects (such as aircraft) or surface

features (as of a planet).

How are radar signals transmitted?

we transmit the waves in "beams".
The "beam" of energy is accomplished by using an antenna which focuses the radar energy onto a parabolic reflector. A common analogy to this is found in an ordinary flashlight.

How does radar signal processing work?

The signal processor is that part of the system which separates targets from clutter on the basis of Doppler content and amplitude characteristics.
In modern radar sets the conversion of radar signals to digital form is typically accomplished after IF amplification and phase sensitive detection.

How does a laser radar detector work?

Radar is the use of radio waves to detect and monitor various objects. To do this, the radar device emits a concentrated radio wave and listens for any echo.
If there is an object in the path of the radio wave, it will reflect some of the electromagnetic energy, and the radio wave will bounce back to the radar device.

Do radar detectors actually work?

by bouncing high-frequency electromagnetic waves at an object.
When the waves return, a detector measures how much their speed and frequency have changed.
but many of those devices operate on police frequency bands, Auto blog reports.

What is radar and laser?

Laser radars-(ladar - laser detection and range)- shorter wavelengths covering from the ultraviolet to visible and infrared.
ladar can measure simultaneously the range, velocity, reflectivity, azimuth, and elevation angle.

the purpose of radar

today is used to detect and track aircraft, spacecraft, and ships at sea as well as insects and birds in the atmosphere; measure the speed of automobiles; map the surface of the earth from space; and measure properties of the atmosphere and oceans.

How far can radar detect?

as low as 100 feet or less to over a mile.
radar may track a distant large vehicle instead of a closer small vehicle without any indication to the operator which vehicle the radar is tracking.
The angle between the radar or lidar and target must be small for an accurate speed measurement.

How are radars made?

A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the object(s).

Does radar work in the rain?

Yes, they are still accurate. rain and fog greatly affect the range of the radar beam.
so the object in the beam must be closer so that more of the beam can contact the surface of the moving object to reflect back to the radar unit.

LASER (Light Amplification Through Stimulated Emission of Radiation)

laser beam transmits an audio signal from the “boom box” left to the auxiliary input of the receiver at right, and you hear it through the speaker. The receiver amplifies this signal and plays it through the speaker.

How doe a laser transmit data?

travels, the waves spread out. The infrared light used for laser communications differs from radio waves because the infrared light packs the data into significantly tighter waves, meaning ground stations can receive more data at once.

How laser light can be used in signal communication?

Researchers realized that light could outperform radio in terms of information speed and density. Light wavelengths are packed much more tightly than sound waves, and they transmit more information