Estimating Ground Inclination Using Strain Sensors with Fourier Series Representation
(a) RMSE for different Fourier series harmonics where the estimator is tuned for slow, fast, and the combined slow + fast walking speeds. No significant improvement is made for . For the speed invariant estimator has RMSE compared to for the estimators specially tuned for slow or fast walking. (b) Measured strain signal (black) and its Fourier series approximation (red), using harmonics.
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