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Ground penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. When the waves hit an object, the receiving antenna can be used to distinguish what it is. This can be used to find precious metals, like gold, underground.
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How low do you have to fly to fly under radar?
It depends. Flying below radar is usually flying below the equipment used to detect things on radar. It could be a very high tower, hundreds of stories off of the ground, or it could be a satellite just a couple stories off of the ground.
What is the history of the Doppler RADAR?
Doppler RADAR measures the speed of objects using the Doppler effect (discovered by the Austrian mathematician and physicist Christian Andreas Doppler in 1842 at the Prague Polytechnic) in addition to the position measured by ordinary RADAR. The earliest version of Doppler RADAR was introduced by the U.S. Navy during WW2 on night fighters. Doppler RADARs are used now in aviation, sounding satellites, meteorology, police speed guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose), and bistatic radar (surface-to-air missile).
How do you make plane invisible to the radar?
It is not possible (with today's technology) to make a plane completely invisible, but there are techniques to reduce the radar energy being reflected to the radar aerial. If reduced enough, the aircraft may appear smaller than it is, or even be classified by the system or operator as a non-aircraft. The aim is to reduce the Radar Cross Sectional Area (RCA) of the plane.This technology is commonly referred to as 'stealth'. Modern stealth aircraft have an RCA much smaller than 1 square metre and in some circumstances can be as low as that of a large bird.The most noticeable method of reducing RCA is to eliminate right angles and especially internal angles of 90 degrees. This is because energy entering will be reflected straight back the way it came. By using curves and obtuse or acute angles the energy is instead reflected away from the radar source. Use of clean lines and unbroken surfaces also reduces bumps and protrusions which also increase the RCA. By comparing a modern stealth fighter to older aircraft, it is clear that care has been taken to eliminate any feature which would reflect radar energy.Another less obvious technique is to use radar absorbent paint. This expensive material works best against specific wavelengths of radar and will dramatically reduce the reflected energy. It works by allowing a proportion (about 50%) of the energy to be reflected and the remainder to penetrate. If the paint is exactly 1/4 of a wavelength think (hence the expense!) it will reflect off the inner paint surface and be 'antiphase' as it emerges again. This cancels out much of the radar energy in the same way that ripples in a pond from two pebbles cause patterns of high and low ripples.Combinations of techniques such as these can reduce the aircraft RCA to that below the capability of most radars to detect at normal range. As the aircraft approached the radar emitter the radar signal will be increased until it is recognisable as an aircraft. However, by avoiding flying close to radars it may be possible to avoid detection at all, or at the least until it is too late to be a problem for the mission.
Which of these is a different between EFPs and other IEDs?
EFPs have a higher casualty rate than other IEDs
What are the simple machines on a helicopter?
A screw used to move flaps, pulleys used for steering, The level - used in conjunction with pulleys to operate some of the Yoke controls, the wheel - used in moving the craft on the ground and moving inflight trollies
What is a radar that allows scientists look in the ground?
It is simply called "ground penetrating radar." It is used for diverse applications from police forensics to geology and geophysics.
What besides geology can GPR ground penetrating radar be used for?
GPR is commonly used in archeological applications
What are the different types of geophysical survey used by archaeologists?
Resistivity, magnetometry, Ground Penetrating radar and metal detecting.
Can long term exposure to Ground Penetrating Radar cause cancer?
No.
Why do scientists conduct radar surveys of archaeology sities?
Scientists conduct radar surveys of archaeology sites to map underground features without the need for excavation. Ground-penetrating radar can detect buried structures, artifacts, and tombs by sending radar signals into the ground and analyzing the reflected signals. This non-invasive technique helps archaeologists plan excavations more effectively and preserve cultural heritage sites.
What are some common things that ground penetrating radar is used for?
it's used in Geology and archeology, and can also be used to find burial sites among other things.
Is radar 2D or 3D?
Both. Original radar is 2D and was invented in 2D. Modern radar is in 3D and is generally used for ground penetrating radars. Eventually 3D will be incorporated into new modern warships and air defences.
Why wouldn't sonar work on land surface?
It does. Ground penetrating radar (GPR0 is an available and useful apparatus.
What technology can help an archaeologist see a buried sight before sight before they excavate it?
Ground penetrating radar
What do people use to measure how thick the ice in Antarctica?
The tools used include laser and ice-penetrating radar and the discipline of radar interferometry.
What recent technological advances have helped geographers study the earth?
The development of ground-penetrating radar has been of great assistance to archaeologists, as well as geologists.
What recent technological advances have helped geographers study earth?
The development of ground-penetrating radar has been of great assistance to archaeologists, as well as geologists.
