0
Radar (RAdio Detection And Ranging) transmits high-frequency, short-wavelength radio waves at the moving object and receives waves reflected from the object. If the object is not moving, the waves bounce back at the same frequency they were transmitted at, and you can determine the distance by how long they take to return.
If the object is moving towards the detector, the frequency is higher because each cycle travels a slightly smaller distance, hence returns faster (the Doppler effect). If the object is moving away, the frequency is slower for the same reason. The difference is, at low speeds, proportional to the speed of the object. If the object approaches the speed of light, relativity messes up this simple relationship.
So, if the object moves towards you at 100 wavelengths of the radar wave per second, the received frequency will be 100Hz (or cycles per second) faster than the transmitted frequency. Since you are generating the radar wave at a known frequency, you know the wavelength also.
Continuous wave/doppler radar has a problem if the object is travelling obliquely to the receiver; the shift is not as pronounced as it would be on an object traveling directly toward or away from the receiver. This is where pulse radar comes into it's own. Bang out a narrow pulse then 'listen' for a return echo. The time it takes to return gives the distance. Because the antenna rotation speed is constant, if the object moves obliquely then the angular difference between returns can be used to determine the speed.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What is the palindrome for-instrument-used-to-determine-speed?
radar
A palindrome for instrument used for determining speed?
radar
What is the palindrome for an instrument used to determine speed?
Radar.
Which tool is best used to monitor the speed of moving vehicles in a city?
pulsed radar is used for measure the speed of the vehicle accurately
What is a radar laser detector used for?
A radar laser detector is a device used to detect and alert the driver to the presence of radar and laser speed enforcement devices used by law enforcement agencies. It scans for radio waves emitted by radar guns and laser guns, giving the driver a warning to slow down and avoid getting a speeding ticket. It helps drivers be more mindful of their speed and potentially avoid costly fines.
Which radar is used to measure the speed of vehicles?
A radar gun measures speed of a moving object basically cops use them
When was RADAR first used for baseball?
Radar was first used to measure the speed of a moving object in 1935. By 1938, they were used to measure the speed of a fastball thrown by Bob Feller.
What instrument is used for speed?
radar
When was RADAR first used to clock pitching speed?
RADAR was first used to clock pitching speed in 1972. Earl Weaver was the first person to use the RADAR gun to determine speed in baseball.
What are the advantages of radar range over radar bearing?
Radar range is the distance of the object from the radar. Radar bearing is the direction of the object in relation to the radar. As radar is primarily used for ranging, the range information may be more important than the bearing.
What was a radar in battle of Britain World War 2 used for?
radar is an object detectotion system
Can a radar detect you on a jet ski?
Yes, a radar gun can be used on any moving object.
What is the smallest object radar can pick up?
The smallest object most radar can pickup is a bird. Radar used by air traffic control and civilians is less accurate than that of the military.
What is the palindrome for-instrument-used-to-determine-speed?
radar
A palindrome for instrument used for determining speed?
radar
What is the palindrome for an instrument used to determine speed?
Radar.
What did the radar do?
radar sends electromagnetic waves and it is reflected back by the object such as a plane or a sub and based on the analysis of time and speed of wave we get the position of object. for an example of radar they used radar before pearl harbor and saw many planes, the radar operatiors thought it was a squadron of b-29's returning to base but it ended up being the empire of japan's zero's (type of lightly armored plane that sacrificed armor for speed,agility,and a better service ceiling (how high a plane can go))
