V.A. Gaisky
Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28
E–mail: gaysky@inbox.ru
DOI: 10.33075/2220-5861-2023-2-50-58
UDC 681.5.08
Abstract:
To expand the frequency range to the frequency of the measured parameters, it is proposed to use n sensors of various well-known inertia parameters, to the outputs of which n accurate analog-to-digital converters with a sampling frequency and m discrete Fourier transforms N time readings into n spectra of amplitudes of the real from of the members and the imaginary from of the members of the frequency components are connected. Using the known aliasing mechanism (superposition of n high frequencies on the lower ones) for each frequency component of each sensor, the sum of n the overlapping frequencies with the weights of the real and imaginary components of the transfer characteristics of the sensors is made up, form them systems of linear algebraic equations from n strings are formed for individual frequencies from n. The solution of these N systems determines n additional spectral components of the measured signal for discrete frequencies in the band . In this way, an increase in speed by n times is achieved without creating a less inertial sensor, which is impossible for some sensors, for example, very accurate quartz and stable ones, as well as without upsampling and accurate analog-to-digital conversion, possibilities of which also have quantitative limitations for the achieved level of technology. This is accomplished through structural redundancy: the use n of different measuring channels and special processing of primary measuring information with the beneficial use of the inertia of the sensors and aliasing during upsampling to modulate the high-frequency components and transfer them to the low-frequency part of the spectrum of the measured signal with subsequent restoration.
Keywords: information sensor, aliasing, broadband.
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