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- the RADAR transmitter sends out a pulse of radio waves
- the radio waves bounce off objects
- the RADAR receiver picks up the reflected pulses of radio waves
- the round trip travel time is measured electronically or displayed on a 2D screen
- the travel time tells how far away the objects are
Most modern RADARs use radio waves in the microwave band but HF band, VHF band, and UHF band radio wave have also been used.
Older RADARs use a mechanically rotated or wobbled dish antenna, but many newer RADARs use a stationary Electronically Phased Array flat plane antenna (this type of antenna is another topic just by itself).
LIDARs work the same but use light wave pulses generated by LASERs instead of radio waves.
A basic summary of how radar works is that a pulse is transmitted and any return or echo is listened for. If a return is sensed, the timing between the transmission and the reception of the echo is used to determine how far away an object is. There are some other ways in which radar works as well.
Radar is something that is in use all around us, although it is normally invisible. Air traffic control uses radar to track planes both on the ground and in the air, and also to guide planes in for smooth landings. Police use radar to detect the speed of passing motorists. NASA uses radar to map the Earth and other planets, to track satellites and space debris and to help with things like docking and maneuvering. The military uses it to detect the enemy and to guide weapons.
Radio pulses are transmitted from the antenna, reflect back off objects, and are received again by the same antenna. The time is measured from transmission to reception and used to calculate distances to the objects. In most systems the time measurement & distance calculation are a single implicit operation done directly in the display by calibrating it in distance not time units.
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A basic summary of how radar works is that a pulse is transmitted and any return or echo is listened for. If a return is sensed, the timing between the transmission and the re…ception of the echo is used to determine how far away an object is. There are some other ways in which radar works as well.
Radar is something that is in use all around us, although it is normally invisible. Air traffic control uses radar to track planes both on the ground and in the air, and also …to guide planes in for smooth landings. Police use radar to detect the speed of passing motorists. NASA uses radar to map the Earth and other planets, to track satellites and space debris and to help with things like docking and maneuvering. The military uses it to detect the enemy and to guide weapons. Radio pulses are transmitted from the antenna, reflect back off objects, and are received again by the same antenna. The time is measured from transmission to reception and used to calculate distances to the objects. In most systems the time measurement & distance calculation are a single implicit operation done directly in the display by calibrating it in distance not time units.
Answer: There are actually two answers to this question, depending on which form of Doppler radar is being spoken of. True Doppler radar is what is used by police officer "rad…ar guns" to determine the speed of a motor vehicle. Another form is the Pulse-Doppler radar which is used to track the speed of weather precipitation.
Yes, but not as well as we wish they would work! Don't depend 100% on a radar detector. There are a number of related questions and answers on WikiAnswers on radar and sp…eed control. A link is provided.
It only works when you are not on you're bike & you are in the grass but the poke radar has to recharge after you use it.So when you are on you're bike & you are in the grass …use you're poke radar to see patches of grass where Pokemon are.
the beams go bouncy bouncy and then come back
Well Airborne RADAR works in similar manner as their Ground counterpart , the differences typically lies in mode of operations, processing software , physical size and funct…ions .usually Airborne RADAR's , especially for those who's required to detect target that flies at low altitude uses Doppler measurements to differentiate between target and steady objects like grounds . It's also may have a "compensations" to correct tracking error caused by the carrier's own movement EDIT- It seems the previous answer is bit too complex for some people Air to Air airborne radar uses combinations of range ambiguous and Doppler ambiguous modes. High Pulse Repletion Frequency (HPRF) modes which are range ambiguous, to measure Doppler unambiguously. Low Pulse Repletion Frequency (LPRF)modes measure range unambiguously both of these modes still measure both Range and Doppler and resolve the ambiguous measurement using Chinese remainder theorem. This resolving of the ambiguous measurement uses different measurement parameters that are not related provide a measurement remaining that can be related to unfold Range or Doppler measurements. In between the HPRF and LPRF is the Medium Pulse Repetition Frequency Mode which are both Range and Doppler ambiguous. Repetition Rate of Pulses adaptation can be mixed together and sequenced. Some modes are have better properties then others for measuring particular targets or characteristic of some targets. The question of ambiguity, and therefore what defines a Pulse Repetition Frequency as High Medium or Low is dependent on the target characteristic and the range you wish to measure to.
it bounces off of objects
A sonar transmits sound waves and captures it back after they strike an object. They work on the dopplers principle.
No. With police officers in motion, it would appear that cars would be going slower. Say that a car is going 50 MPH, and you are going 45 MPH. Eventually the vehicle wil be ah…ead of you. Now say you are a police officer with radar. If you test this car, it will appear (on radar) that the 50 MPH car is only going 5 MPH, thus to get the accurate speed, you must be going 0 MPH. Disagree. The original police radar required a stationary unit. Radar is use for the past 30 years is capabable of adding or deducting the speed of the police car from the observed speed. It does not require that the police car be in one fixed spot. Added: The second cotributor is correct. I seriously doubt that any of the old radar units are still in operation much less certifiable as accurate. ALSO: the term "radar" is a commonly used by the the public to describe ALL police speed-clocking devices. Any of these can be calibrated to be used while the vehicles are in motion.
The Frank's Box was one that cycles through random frequencies and allegedly allows spirits to manipulate said frequencies so that certain broadcasted words can be used to res…pond to questions. We covered the Frank's Box in a previous article and having seen it in action I can't say that there is much happening here other than random words that may or may not be relevant to a posed question. The Ghost Radar is the newest of these gadgets to make their way to the public for mass consumption. For a few bucks anyone with an Android phone, iPhone, iPad, and BlackBerry devices can get an ad free version of the software. I am not going to bother explaining how it works, as I am not sure it even does. I have used it in places where no known activity is said to exist and I still get random words spoken and ghostly blips on the radar. These random words could mean something to someoneone and if you were to listen with a group of friends there is bound to be more relevant "hits". The interesting part is that when investigating an allegedly haunted location, the words spoken tend to take on more meaningful logic. During a recent investigation at Historic Fort Morgan we heard some words spoken that were VERY relevant if the spirit of someone who had been stationed at the previous fort that stood on the spot of Fort Morgan was hanging around with us. Fort Bowyer guarded Mobile Bay prior to the erection of Fort Morgan. It was taken by the British during the war of 1812. The sad part is that this battle as well as the Battle of New Orleans should never have happened because the Treaty of Ghent had been signed the previous Christmas Eve and the war had officially ended. Because of the difficulty getting communications to these points neither side was aware the war had ended. Two battles raged after the war had ended and lives were pointlessly lost. Obviously, U.S. Soldiers who lost the fort in the War of 1812 had very strong feelings about these Europeans. As evidenced by the responses we got on the ghost radar. Someone Doesn't Like Europeans We also had a female investigator present and the application pointed out the fact that she was in a Fort where women were not allowed by saying "Female". We assume that's what it meant, it could have just been a random word. During another session with the Ghost Radar the word "melted" was spoken which could have been completely random if there had not been a fire at the fort in the enlisted men's quarters, roughly in the spot where we were sitting. The main problem I have with this software is that it speaks ALL THE TIME. Granted, it became much more accurate in a place suspected of having paranormal activity and the words spoken were very relevant to the history of the fort. Or, they were just random words generated by a silly cellphone application and we inflated the importance of these spoken words so that they fit within the context of our investigation. The application did not allow the words to respond directly to us, not that we experienced anyway. We would ask questions and there would be words spoken that seemed relevant to our surroundings but did not answer our questions directly. Reviews on the company's site indicate that others have had moderate success with spirits using the software to directly interact with them, this group however was not so fortunate. As with any tech, the jury is out on this tool. We will use it a few more times to determine if it provides any value whatsoever. I am not comfortable using this tool as "evidence" when there is no proof of its scientific value, but it does add an interesting dimension to those slow investigations where you feel like you are simply entertaining yourself. The name of the application again is Ghost Radar and the maker of the application is Spud Pickles.
It works by sending out a continuous data signal, identifying the aircraft. This is picked up by equipment at the control tower and overlaid onto the radar screen. The data sh…ows the aircraft's individual ID, it's height and speed. Not ALL aircraft are fitted with transponders - small planes, micro-lights and hang-gliders don't normally have the equipment. They have to contact the control tower by radio, and identify their aircraft. This info is then manually inserted onto the radar image.
There are two types of radar...primary and secondary. Primary radar relies on reflections from the surface of targets (Skin paints) and secondary radar relies on a transponde…r in the target to amplify and reply to radar transmissions. Primary radar navigation mainly relies on the ability to see geographical features by means of the radar. Secondary radar navigation uses systems like Air Traffic Control Radar Beacon System (ATCRBS) which allows ground facilities to track aircraft, and Distance Measuring Equipment (DME) which allows an aircraft crew to measure their distance to a ground beacon. There are other systems, but GPS is not one of them.
The radar works just fine, but the operator (the traffic officer) may not be able to see an approaching vehicle as well or as far away in fog conditions. The proper way to use… traffic radar is to observe a speeding vehicle, visually estimate its speed, and then confirm the speed with the traffic radar. In dense fog, the traffic radar may indicate speeding vehicles the officer cannot see.
Something to do with sound waves, like a bat uses to 'see'.