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|Title: ||Impedance Frequency Response Measurements with Multiharmonic Stimulus And Estimation Algorithms In Embedded Systems|
|Authors: ||Santos, José|
Janeiro, Fernando M.
Ramos, Pedro M.
|Keywords: ||Embedded measurements|
Impedance frequency response
Multiharmonic least-squares fitting
Memory efficient implementation
|Issue Date: ||Feb-2014|
|Citation: ||18. José Santos, Fernando M. Janeiro, Pedro M. Ramos, “Impedance Frequency Response Measurements with Multiharmonic Stimulus And Estimation Algorithms In Embedded Systems”, Measurement, vol. 48, no. 1, pp. 173-182, February 2014.|
|Abstract: ||Performing impedance frequency response measurements with standalone embedded
instruments currently presents some challenges due to the limited amount of memory
available in these systems. The impedance frequency response can be obtained through
a single-tone sweep approach together with a traditional sine-fitting algorithm. However,
this approach is not suitable when the measurand is quickly evolving over time because in
those cases the acquisition should be performed as fast as possible. This can be achieved by
applying a multiharmonic stimulus and using least-squares estimation algorithms to
extract the amplitude and phase of each frequency component. However, the memory
requirements of these least-squares algorithms do not allow them to be implemented in
standalone 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.|
|Appears in Collections:||FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
CEM - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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