What is radar navigation?

Answer 1

"RADAR" is an acronym for RAdio Detection And Ranging, which is a broadcast beam and receiver, used primarily to detect the objects (such as aircraft) which are at a distance that cannot be observed visually. It is one of the applications of microwaves. Radar is used along with advanced transponder technology in air traffic control. Smaller radar units have been used to measure the speed of cars and trucks on highways, using the Doppler effect (frequency shift for moving objects), although these have mostly been replaced with laser devices using the same principle.

Radar is based on the principle that the RF signal at a high frequency is reflected back by reflective objects, typically large objects made from metal, composites, or rubberized materials. The distance between the radar antenna and the target can be measured by the delay time (microseconds, millionths of a second) between the broadcast and detected return.

The reflected signal is known as a 'radio echo'. The time taken by the signal to travel one nautical mile is 6.18 micro seconds, so it requires 12.36 microseconds to reach and return from an object one nautical mile away. The formula to determine the distance of the object 'S' is S=T/12.34 where 'T' is the time taken for the transmission and reception of the signal.

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Radar is an acronym for RAdio Detection and Ranging. It uses RF transmission (radio frequency) in the microwave band to detect and range any detectable target within its range. It is an "active sensor" which emits RF waves that bounce off a target and are detected when the wave is received back. The time delay between transmission and detection produces its range given that the RF wave propagates at a uniform speed.

Modern "stealth" aircraft use RF scattering, along with microwave-absorbing materials, to avoid detection by traditional radar. Some advanced planes have radar reflection signatures so low that they are less than those of small birds.

Answer 2

One of the most commonly-known uses of is to detect speeders. It is also used to monitor weather systems, as a navigational aid in airplanes and ships, at airports and to identify and track satellites orbiting the Earth. The term "radar" --- an acronym for the words Radio Detection and Ranging --- applies to both the system and the equipment used. The first recorded use of the word was in the New York Times in 1941. Radar uses echoes to find objects and pinpoint their location. The equipment transmits signals and measures the time it takes to reflect off the target and return. Robert Watt demonstrated radar for the first time on February 26, 1935, using a transmitter to successfully identify the approach of a bomber some eight miles (nearly 13 kilometers) away.

Radar is used for geometry and object detection in a wide variety of applications. Ships and planes used it to detect one another to avoid collisions. Airports use it to help guide planes and detect unauthorized entry into controlled airspace. The military uses it to detect missiles and potential enemy movements. Police use Doppler radar guns to measure how fast cars are moving. Doppler weather radar is used to detect precipitation in storms as well as signs of potential tornado activity. It is also used to study storms such as hurricanes and tornadoes. Astronomers use radar to track objects in space and to map the surfaces of Venus and Titan, which are hidden by thick clouds. Ground-penetrating radar is used to detect objects and features underground.
The applications of radar are so diverse and range from multi million dollar space bourn ground mapping and imaging Radar to twenty Dollar car reverse sensor or speed guns. There are several basic capabilities that a RADAR system application can provide top an application. These are largely the RADAR degrees of freedom (the things it can measure), note that not all applications use all of them, some only one (Despite the acronym of RADAR), some only a subset and other use all four basic degrees and more. The degrees of freedom are 1) Azimuth (Formally known as Theta) 2) Elevation (Formally known as Phi) 3) Range (Formally known as r) 4) Doppler (Formally known as Range dot "r."). Some applications include finding speed only (Doppler speed gun, sports and police). Finding Range (Car Reverse Sensor, aircraft active altitude detection and terrain avoidance). Finding Azimuth and Range (Maritime Radar). Finding Azimuth, Elevation and Range (ATC Radar). Finding Azimuth, Elevation, Range and Doppler (Weather Radar, Early Warning Radar). Some hybrid degrees of freedom also exist like mono-pulse and interferometer which maybe used for terrain mapping or signal tracking and can require multiple antennas or multiple beams on a singles antenna.

Answer 3

What does radar what? What does it do? Weather radar scans layers of the atmosphere to find rain and storms. Rain or clouds will reflect the radar signal back to the transmitter, indicating a cloud heavy with rain or a lighter, non rain cloud.

Radar may also be used at an airport to tell the controllers where planes are both in the air and on the ground.

Radar may also be used in a plane to tell the pilots if their are other planed in the sky near them that they should know about.

Radar may be used on a car, (usually the nicer more expensive cars), to tell the driver if there is something behind them that they are about to back over or if they are going too fast and getting too close to the car in front of them. Some cars will automatically slow down if they are too close to the back bumper of the car in front of them.

When radar is used underwater, it is called sonar.