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- W1495772942 abstract "Two additional frequency modulated signals are described that are different from the linear-FM signal discussed in the previous chapter. The first is the Costas signal, in which the frequency evolution is random-like, in contrast with the linear evolution in LFM. The resulting ambiguity function (AF) has a thumbtack shape, in contrast to the ridge found in LFM. The Costas signal is explained in detail, and the Welch construction algorithms are described. Appendix 5.1 includes a MATLAB code that implements those algorithms. Because LFM exhibited relatively high autocorrelation sidelobes, some form of amplitude weighting was necessary in order to reshape the spectrum and thus reduce the autocorrelation sidelobes. In nonlinear-FM, the second signal discussed in this chapter, the spectrum is shaped not by amplitude weighting, but by spending more time in the frequencies that need to be emphasized. Several different nonlinear frequency evolution laws and their performances are described." @default.
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- W1495772942 date "2004-07-09" @default.
- W1495772942 modified "2023-09-25" @default.
- W1495772942 title "Frequency‐Modulated Pulse" @default.
- W1495772942 doi "https://doi.org/10.1002/0471663085.ch5" @default.
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