Figure 1From: Systematic analysis of uncertainty principles of the local polynomial Fourier transformThe second-order LPFT of a chirp signal with different window width parameter a . The image shows the instantaneous frequency of the chirp signal and the LPP with different window width parameter a. (a) The instantaneous frequency of the chirp signal; (b) LPP with a=25; (c) LPP with a=2.5; (d) LPP with a=0.25.Back to article page