NLFM
NLFM stands for Non-Linear Frequency Modulation, a class of frequency-modulated waveforms in which the instantaneous frequency varies according to a nonlinear function of time, unlike linear FM (LFM) chirps where frequency changes linearly during the pulse.
The primary motivation for NLFM is to shape the waveform’s spectrum and autocorrelation function to achieve
Design methods for NLFM typically involve determining a nonlinear frequency history f(t) that yields a desired
Practical considerations include increased design and processing complexity, and potential sensitivity to Doppler shifts and range-Doppler
NLFM is used in radar and, to a lesser extent, sonar and experimental communications contexts where suppressing