Comments to H. Mott's Memo (1).
MARK RESOURCES INC MARINA DEL REY CA
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There are two fundamental methods of generating clutter signals 1 The three-parameter model, and 2 the real-time FFT approach. While the first method is computationally very fast, it is severally limited in its flexibility to approximate the spectral shapes of the three monopulse channels. The FFT approach is an exact one, in that any spectral shape can be accommodated. However, the real-time constraint forces us to use approximations even in this case. But with the program delivered the accuracy is generally within 2 or 3 dB for a wide variety of engagement geometries, compared to a 10 or 15 dB accuracy that would result with the three-parameter model. It was determined in May 78 that no tapped-delay lines would be available for the tests in the fall 78. Therefore it was recommended that the more exact approach, namely the one based on the real-time FET should be implemented for the Tri-Fast tests. Because of the more time-consuming computation, this program can only be used for a single range gate, at least with the present digital computation capability at the RFSS. Author
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