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
More on topic a digitization Lapse:
- the Analysis of sources of a lapse of the sensing transducer
- comparison of the dielectric performances of four-layer samples BTS, with linear (V) and stage (PG) a tin lapse rate.
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- explored materials
- Reliability of results of work of algorithms of definition of indications of indicators
- Recommendations about raise of accuracy of the sensing transducer
- mathematical model of an existential filtering
- CHAPTER 4 THE DIELECTRIC PROPERTIES OF SCHISTOSE CERAMICS ON THE BASIS OF TITANATA - STANATA BARIUM