Estimating Ground Inclination Using Strain Sensors with Fourier Series Representation

Figure 2

AFO strain signal output and extraction of strain signal for one gait cycle (red (*)). Thresholds ${\gamma }_1,\hspace{0.17em}\hspace{0.17em}{\gamma }_2$ for finding the auxiliary times $t_{\text{aux}}$ (first $t$ when $S(t)<{\gamma }_1$) and $t_{\text{start}}$ (first $t$ when $S(t)>{\gamma }_2$) are indicated.