Noise radar

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As noise radar (even stealth radar or stealth radar ) refers to one of the American US engineer Eric Walton developed radar tracking device , the very offers many more possibilities, unlike conventional radar signals and is much harder to locate its source simultaneously.

functionality

The noise radar uses pseudo-random noise as a signal , which is strictly deterministic, but which is so similar to the constant mix of cosmic radiation and radio traffic in the atmosphere that it can only be detected by outsiders if the exact generator sequence is known. Alternatively, real noise can also be used, which has the advantage that it is non-periodic, but the disadvantage that it is more complex to process (generation as well as evaluation). In contrast to the short, intense pulses of conventional radar systems, the noise radar works with weak but longer signals that are spectrally spread . The very minimal differences between the output signal and the echo can be analyzed by means of digital signal processing and a radar image can be generated from this.

history

The idea of ​​noise radar has existed since the 1950s. The implementation was only possible with the use of computer chips that work in the gigahertz range. In addition to Walton, many other scientists are also researching noise radar, including a team from the Technical University of Ilmenau under Jürgen Sachs.

advantages

Noise radar can work with a very broad signal bandwidth and can therefore be used in very different ways. In addition to the militarily interesting option of having a radar source that cannot be located, it is therefore also used for purposes of disaster control ( e.g. searching for buried people), static tests of buildings or, so the researchers from the TU Ilmenau hope, also for investigating human ones Blood vessels suitable.

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