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a digitization Lapse

At application fazometricheskogo a method of measurement of an angle of turn on baseline akselerometricheskih measurements which is based on direct transformation of signals from three-componental accelerometres in sine wave oscillations phase, the measurement lapse is defined by a lapse of measurement of a phase [117,118].

As phase measurement is under construction on measurement of time intervals, there is a lapse of a digitization [119-121]. Thus the digitization lapse is defined by a relationship of frequency of basic sine wave oscillations and frequency of a digitization of a signal of the accelerometre, and also applied algorithm of approximation of a legitimate signal between readout. In drawing 38 formation of a lapse of a digitization of a signal is shown.

Drawing 38 - the Lapse of a digitization of a signal of the accelerometre

In applied algorithms of digital machining of a signal traditionally between otschetamiprimenjaetsja linear approximation:

) Presenting real process on the interval the next readout:

98

Where - frequency of the basic oscillator, φ - a measured phase.

Approksimatsionnye factors are defined on following relationships:

The phase is defined on the basis of the equation (85) through time shift τ, forming thus a lapse of definition of an angle of the accelerometre through a phase lapse

Expression for a time interval defining the measured phase on the n-period of measurement, looks like:

Where - frequency of a digitization.

In the assumption of frequency rate of frequencies, a relationship of frequency of the oscillator and frequency of a digitization:

Proceeding from relationships (87) and (88), expression for a phase, gained on the basis of algorithm of linear approximation:

Thus the angle of turn of a kinematic couple concerning two coaxial accelerometres, is defined by a phase difference measured and a reference signal

Let's size up a lapse of definition of an angle in this case, for real value of phases on the basis of direct scalings:

99

In this case the analytical form for an estimation of a lapse of measurement of an angle by means of akselerometricheskogo looks like a method:

Apparently from expression (92), the lapse of definition of an angle can be reduced at the expense of increase in frequency of a digitization in relation to frequency of the oscillator.

3.3.2

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A source: GRECHENEVA ANASTASIYA VLADIMIROVNA. PHASOMETRIC METHOD OF MONITOMETRIC CONTROL ON THE BASIS OF ACCELEROMETRIC CONVERTERS. Thesis for the degree of candidate of technical sciences. Belgorod - 2019. 2019

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