Impedance frequency response measurements with multiharmonic stimulus and estimation algorithms in embedded systems

This paper presents a memory efficient least-squares fitting algorithm that enables the use of multiharmonic signals for impedance frequency response measurements in memory limited embedded systems. The measurement time and memory requirements are compared between the single-tone sweep, traditional multiharmonic and memory efficient multiharmonic approaches for different combinations of the number of harmonics and number of acquired samples. This performance evaluation is also done on impedance frequency response data, acquired and processed in a DSP based device for the single-tone and memory efficient multiharmonic measurement alternatives.