Radars, theory. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / metal detectors
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It is a well-known fact that with the help of modern radars it is possible to detect an aircraft at a distance of several hundred kilometers. The question arises: does modern electronics really not allow you to create a compact device that allows you to detect objects of interest to us at least at a distance of several meters. The answer is a number of publications in which such devices are described.
Typical for them is the use of the achievements of modern microwave microelectronics, computer processing of the received signal. The use of modern high technologies makes it almost impossible to independently manufacture these devices. In addition, large overall dimensions do not yet allow them to be widely used in the field.
The advantages of radars include a fundamentally higher detection range - in a rough approximation, the reflected signal can be considered subject to the laws of geometric optics and its attenuation is proportional not to the sixth or even to the third, but only to the second power of the distance.
Author: Shchedrin A.I.
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