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What are the limitations of Moving Target Indicator in Pulse Doppler Radar?
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∙ 11y ago
2)internal modulation of clutter
3)system instability
Wiki User
∙ 11y ago
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Why does the Doppler Effect detect only radial velocity?
This answer assumes that the reader has a fundantal knowledge of what Doppler effect and Doppler radar are. To be effective, Doppler radar, which is an application of the Doppler effect, must be used with the object moving right at or directly away from the Doppler source. It is possible to use Doppler radar on a target moving at a slant, but the angle of convergence or divergence would have to be known and calculations would have to be made to get a correct answer as to that object's velocity. In an situation where it is used to determine radial velocity, it would be tricky to get it to work in this application. Radial velocity is the movement of an object in a circle or an arc of a circle. If the radial velocity of an object was being was investigated, one could use Doppler radar. But there are some issues. Understand that the object is moving in an arc or a circle, like a ball on the end of a string that is being whirled about. The observer would probably want to stand outside the circumference of the circle. Then a "line of sight" would have to be set up to catch the tangent of the circle so the speed of the object could be sampled in an instant when it was moving directly at or away from the Doppler source. This is possible, but challenging. The radius would have to be measured (if it was not know) and a calculation would have to be made. With the radius of the path of travel measured, and the instantaneous speed discovered via the Doppler radar, a calculation would be rather simple. Note that the radial velocity found would be an instantaneous radial velocity. It the radar unit could not be used to sample an instant when the object was moving right at or directly away from the Doppler source, this would make the calculation really, really difficult. It is still mathematically possible to find an object's radial velocity by measuring the speed of an object that is not moving directly at or away from the source, but it's really, really hard. The angle of the objects path of travel with reference to the direction to the Doppler source would have to be known at the instant the radar imaged its speed. Some calculations could then be made. But it's tough. Certainly if the object under investigation is moving laterally with reference to the radar source (moving directly perpendicular to the line of sight from the radar unit), the source will not be able to see it as it is moving at a right angle to the radar. That means no Doppler effect with which the electronics can work to determine speed. Let's wrap up on this important note. When any object moves in anything but a straight line, its velocity is changing - even if its speed remains constant. That's because velocity is speed with a direction vector tacked on to it. An object moving on a radial path is constantly changing velocity, even if it's just changing direction and moving at a constant speed.
What does a dolpar radar measure in units?
Do you mean Doppler radar? If so, Doppler radar measures velocity. It's a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the frequency of the returned signal has been altered by the object's motion. This variation gives direct and highly accurate measurements of the radial component of a target's velocity relative to the radar. Doppler radars are used in aviation, sounding satellites, meteorology, police speed guns, and radiology. The specific term "Doppler Radar", due in part to its extremely common use by television meteorologists in on-air weather reporting, has erroneously become popularly synonymous with the type of radar used in meteorology. Most modern weather radars use the pulse-Doppler technique to examine the motion of precipitation, but it is only a part of the processing of their data. So, while these radars use a highly specialized form of Doppler radar, the term is much broader in its meaning and its applications.
Why does a bomber not drop its bomb vertically above the target?
Because the bomber is moving quickly, which means that the bomb is travelling quickly forward when it is launched. This would take the bomb way past the target by the time it reaches the ground.
What does the organs influenced by hormones are called?
They are the target organs. Hormones act on the target organs
Electrons consist of of ?
Yes , X-rays consist of first moving electrons ,because high voltage between cathode and anode causes the electrons to accelerate toward the anode,When the electrons strike the anode's target area, X-rays are emitted.
Which radar system uses the target's Doppler shift to create a silhouette-type image of the target?
ISAR
How does a laser ranging device work?
This device simply sends out a short pulse of light to the target, and measures the time to the the reflection. Knowing the speed of light, this gives distance. By a slight modification, if the target is moving, then the frequency of the reflected light will be different, due to the Doppler principle. Measuring this frequency change gives the speed at which the target is moving either towards or away. - Our laser speed gun.
How a laser ranging device work?
This device simply sends out a short pulse of light to the target, and measures the time to the the reflection. Knowing the speed of light, this gives distance. By a slight modification, if the target is moving, then the frequency of the reflected light will be different, due to the Doppler principle. Measuring this frequency change gives the speed at which the target is moving either towards or away. - Our laser speed gun.
When was A Moving Target created?
A Moving Target was created in 1982.
When was The Moving Target created?
The Moving Target was created in 1949.
What has the author George Achilleus Papadopoulos written?
George Achilleus Papadopoulos has written: 'Integrated circuit design of a video reconstructor for a range-gated moving target indicator'
How many pages does The Moving Target have?
The Moving Target has 245 pages.
What is the ISBN of The Moving Target?
The ISBN of The Moving Target is 9-997-51949-3.
Where could a person buy a Fetal Doppler Monitor?
A Fetal Doppler Monitor or Fetal Heart Monitor can be purchased at Target or Ebay. You can also purchase one from specific sites such as clinicalguard.
What is the ultrasound principle in Doppler ultrasonography?
The ultrasound principle is this: when a high-frequency sound is produced and aimed at a target, it will be reflected by its target and the reflected sound can be detected back at its origin.
What is a notch maneuver?
Notch maneuver is when an aircraft being tracked by a pulse Doppler radar (whether ground or air intercept radar from an adversary aircraft) flies perpendicular to the radar to escape detection and tracking. Since Doppler radars use Doppler shift to determine its target's velocity and whether it's flying away or inbound, when the targeted aircraft flies perpendicular relative to the radar, it loses it's Doppler shift, thus, the radar ignores it thinking that it's a stationary target such as mountains and etc.
What is the best place to purchase a dial indicator?
Walmart and Target might be your choice.
