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There is a particular piece of digital signal processing used in radar (or at
least, it was in use when I was an undergraduate electrical engineering student 25 years ago) called the "chirp Z-transform." The singularities in the function are called the "poles," after an analogue computing technique used in the 1930s for finding those points. It may be that pilots are taught to figure out the poles in the particular function in use and to fly a pattern that corresponded to the singularity, or perhaps their onboard computers do this. Just a guess. Perhaps there are some more current EEs reading who can fill in? David Paul Tomblin wrote: I'm told that fighter planes use the same technique to evade enemy radar guided missiles, flying an arc around the in-coming missile (although they use terminology like "putting your z-pole on the target" or something). I believe fancier radars can apply the speed gate to your speed even if it's parallel to the antenna, even if it's primary only, but I don't believe either ATC radar (which is, after all, designed to track cooperative targets) or older missiles like Sparrow have that capability. I wouldn't be surprised if AMRAAM and other newer missiles do. |
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