Where do radar in dolphins come from?
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Most dolphins have acute eyesight both in and out of the water and their sense of hearing is superior to that of humans. Though they have a small ear opening on each side of their head it is believed hearing underwater is also if not exclusively done with the lower jaw which conducts the vibrations to the middle ear via a fat filled cavity in the lower jaw bone. Hearing is also used for echolocation which seems to be an ability all dolphins have. The dolphin's sense of touch is also well-developed.\n\nHowever, dolphins lack an olfactory nerve and thus have no sense of smell, but they can taste and do show preferences for certain kinds of fish. Since dolphins spend most of their time below the surface in the wild, just tasting the water could act in a manner analogous to a sense of smell.
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Stealth jets, especially the F-117 use a special radar anti-reflective coating and sharp angles to deflect radar signals making them hard to detect on radar and you can't find something if you can't detect it, unless you have a ground spotter calling in coordinates but by the time it is called in the jet has already flown over.  The engine on a stealth jet are also designed to minimize heat exhaust and run cooler than your average jet engine, again, making it hard for heat tracking missiles to lock on.  The skin of a stealth jet, namely the F-117 make it very unstable and requires almost complete computer control during flight, though the pilot can make manual course corrections, it's stability during flight is maintained by a computer without the computer the jet would be too unstable for a human to fly.\n\nThey are stealth to some extent and they mostly fly at night, also, rain somewhat dulls the effects of the special coating and sharp angles of the plane so they typically fly at night in either cloudy or clear skies and in those conditions, they are very, very hard to find.  A F-117 appears to a radar, if it sees it at all to be a small bird like a seagull.\n\nDon't ask what the coating is made of, it is classified.
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Radar is a system that uses radio waves to detect, determine the distance or speed, objects such as aircraft, ships, rain and map them. Speed detection is measured by the amount of Doppler Effect frequency shift of the reflected signal. A transmitter emits radio waves, which are reflected by the target, and detected by a receiver, typically in the same location as the transmitter. Although the radio signal returned is usually very small, radio signals can easily be amplified, so radar can detect objects at ranges where other emission, such as sound or visible light, would be too weak to detect. Radar is used in many contexts, including meteorological detection of precipitation, air traffic control, police detection of speeding traffic, and by the military.  The links below descrilbes how radar works in detail:
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Dolphins are most active when the herd is threatened. They will form a defensive line from attackers.
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Yes, they do....sonar, for example.\n\nThe interface travel between water/air scatters the waves.  You'd probably have to keep the antenna under water.
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Most homing missiles, such as the Aim-9 Sidewinder air-to-air missile, home in on the heat emitted by a target. This is detected by infrared detector arrays in the nose which are built into a feedback control system that directs the missile to the target.\n\nOther homing missiles detect targets that are illuminated by a laser designator. This designator can be mounted on an aircraft or other vehicle from where the missile is fired, or the target can be illuminated by a separate entity on the ground who might have a better view of the situation. The laser is in the infrared frequency range, so can not be seen by the unaided eye.\n\nOthers, such as cruise missiles use GPS or compare detected terrain to onboard terrain maps to follow a course to the target.\n\nRadar is another method that is useful for air or water targets.
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Virtually any polymer is invisible to radar. Radar signals go right through the material, most radomes are made of a pure polymer with a synthetic base paint that is non conductive. They cannot contain any  metalic impurities at all!  \n\nThe exceptions come in when lead and metal additives are added as coloring agents.\n\nSometimes a  (semi conductive) carbon fiber is inserted into the polymer this can act as a resistor, to absorb the radar signal and prevent it's return.  However the actual composite formula is Classified Secret. \n \nThey actually make US Navy Ship Mast and Superstructrures out of composite materials right here in Mississippi that are invisible to Radar, or absorb Radar and prevent what is inside the structure from reflecting the signal.  Again the knowlege that this exist  is public knowledge, it is similiar to the leading edge of Stealth Aircraft, but the Material itself is Classified!  \n\nThere is an absorbent tile which can be glued to just about any surface,  looks just like a piece of common floor tile except that it just absorbs Radar.  Once it is Glued on to a surface with an epoxy base glue it stays!\n\nThis about exhaust everything I can type in the clear about this subject and not end up in prison!\n\nHope I helped you somewhat!\n\nHave A good day!
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RADAR is an acronym that stands for RAdio Detection And Ranging.  It works by emitting a very short pulse of radio frequency energy.  This energy travels out from the Radar antenna until it strikes the surface of a radiowave refective object.  A portion of this energy is returned to the antenna, where it is detected.  Since radio waves move at the speed of light (~186,000 miles per second), this means that it travels one mile every 6.7 microseconds (6.7 millionth of a second).  This might seem like a very fast time, but is still easily measureable.  So if the pulses refection returns in 13.4 microseconds, that means the object is one mile away. (6.7 out + 6.7 back).  The radar equipment is designed to know what direction the antenna is pointed when it send out its pulse, so it can then show on its display exactly where the target is located in both direction (azimuth) and distance (range).\n  As for how it effects the body,  Radar energy is a form of microwave energy, same as the stuff in your microwave oven.  Microwave energy has the effect of heating different types of molecules, such as water, sugar and fats.  This heating effect can damage the body just as if you were inside a microwave oven.  However, as said before, the actual energy pulse is very short.  Remember, after the pulse is produced, you have to wait for the pulse to return before you can send out the next one.  So most radars have an average power (power over time) of not much more than a 60W lightbulb.  Also remember that, except for a few special types, radar antennas are constantly spinning around, so that the amount of energy that passes by any one place is very small.  You can be as close as 5 feet away from most navigation radars without any fear of injury.  (just don't stay there for too long).
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Base reflectivity reports only the lowest angle radar slice regardless of strength of echo return.\nComposite reflectivity reports the strongest echo return of all the radar angle slices.\nAs the radar rotates it starts with a base angle and increases the angle after each rotation and resets after max angle return.
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Checked with a friend of mine he advises me you have LASER, some hand held portables  radar ka guns, and some units have Vascar a non radio in car computer based on officer observation.\n\nThis is connected to the vehicles speedometer through a sensor that feed both the computer and the radar and corrects the vehicle speed indicated for patrol car speed.\n\nAPS
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Yes, it is called a wolphin. Part common bottlenosed dolphin, part false killer whale. I believe. Here's a link to be sure.
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Uses the Doppler effect to detect frequency shifts in the transmitted pulse caused by the radial velocity of detected targets.  The echos is processed through a series of RF filters &, based on the amount of frequency shift & angle of approach, the radar can then determine the true target velocity.\n\nMostly used in weather apps.\n\nPS. the speed of light is normally rounded to 3*10^8 meters/sec or 300,000,000 m/s.  Also Doppler is a guy's name.  (Christian Johann Doppler 1803-1853 Austrian physicist)
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Spy-hopping is when a whale (grey, great blue, orca or otherwise), dolphin, or porpoise and/or other related sea mammal; rises vertically out of the water with it's head and mouth first and scans the entire surrounding area while rotating.
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The Dolphin as a spices is billions of years old. So to answer your question they evolved from sea dinosaurs.
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I think you mean the Doppler Radar,\n\nthe frequecy of the reflected wave changes when the wave is incident on a moving object. this is called doppler effect. you can measure the change the speed of the object by measuring the change in frequency of the wave.\n\nThis principle is used in detecting the speed of vehicles (ultrasound) and stars systems (visible light).\n\na good explanation of the working principle can be found on wikipedia:\n\nDoppler radar uses the Doppler effect to measure the relative velocity information from a radar system. The Doppler effect shifts the frequency of the radar reflection based on the relative velocity (speed) of the "target", allowing for the direct and highly accurate measurement of speed. Doppler radars were originally developed for military radar systems, but have since become a part of almost all radar systems, including weather radar and radar guns for traffic police and sports.
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Actually many mammals were recorded as fleeing to higher ground before the tsunami, even before the water's edge starts receding (best way to tell if a tsunami is coming). The earth vibrates at a constant frequency, which is not noticeable to humans, but still effects us (a result of natural selection). Animals however can sense changes in the frequency, which is directly determined by local shifts such as the weather. That is why animals seem to have a certain prescience concerning the weather.
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An OTDR works by firing light down a fibre optic cable and then measuring the levels of reflected light and knowing the time it takes for the reflected light to be sensed it can tell how far the point of reflection is. They operate in a very similar fashion to radar and are designed to pick up faults in fibre optic cables, be they joints/splices, pressure faults, or clean breaks as these will all reflect light back down the fibre. The principles are also the same for radar in that the shorter the pulse the better the discrimination and the more accurate the outcome. In some case in fibre fault finding the operators of the OTDR will introduce faults on the fibre by submersing it in liquid nitrogen and then using it as a reference point to find the true fault. Having worked in fields where its not easy to find a fault with excavating kilometres of earth the nitrogen method is a god send if somewhat damaging to the cable.