SU293255A1 - LIBRARY | - Google Patents

Description

The present invention relates to the field of specialized computing equipment for measuring the probability characteristics of random processes.

For such purposes, analog electron correlators are used that operate on the principle of decomposing the correlation function in an orthonormal series in terms of Laguerre functions.

Such correlators have the disadvantage that they require the presence of a multiplying device in their composition, which is complex and insufficiently reliable in operation.

The aim of the invention is to simplify and increase the reliability of the device for spectral-correlation analysis and to directly obtain the correlation function curve of the process under study.

This is achieved by using instead of a multiplying device with a smoothing filter a dispersion meter, the technical implementation of which is straightforward.

The principle of operation of the proposed device is based on estimating the coefficients of the decomposition of the spectral density of a randomly centered process under investigation in a series of even positive mutually overlapping functions. The outputs of the measuring dispersion are connected to summing blocks connected to the recording devices via potentiometers of weighting factors. The device contains additional summing unit and frequency filters, whose inputs through gating cascades are connected to summing units, and the outputs are connected to an additional summing unit associated with a recording device. The block diagram of the device is shown in the drawing, where the following symbols are used: 1 - frequency filters with overlapping amplitude-frequency characteristics; 2 - dispersion meters; 5 - block weighting factors; 4 - scales adders,

the output of which is connected to the recording devices (voltmeters) of evaluating the coefficients of the decomposition of the spectral density in a row; 5 - pulse sensor; 6 - gating cascades; 7 — frequency filters whose impulse functions coincide with the Fourier transform of even positive series of functions; 8 - adder; 9 - recording unit (oscilloscope) of the correlation function curve.

The block diagram shows L identical channels for estimating the coefficients Cj of the decomposition of the spectral density Φ ((o) of the random process under investigation in a series of even positive mutually overlapping functionaries / Ci (/ to) frequency filters / are selected based on the following:

(/ w) i (- / o)) 5i (oj),, 2, ..., N.

The parity and positivity of functions 5; (c1)) is a necessary condition for the physical realizability of frequency filters /.

It is known that the estimation algorithm

decomposition factor a

spectral density in the series has the form;

lsop

“; 2 bTk 1F (w) 2bA

F (a)) | K (/ w),

 Ik

 -:

k l-os

t;

where are the elements of the matrix inverse to the matrix Qb, with the elements

oo

; -1-5 И-5 CHIS consequently, to calculate the coefficients, the output of the filters / need to be connected to disnergies 2, and the measured value of disnersion with weights bij (i, jl, 2, ..., L) and iodate to the balance weights 4 The weight coefficients block 3 n balance weights 4 are analog amplifier-inverters with N inputs each. A registering device (for example, a voltmeter) is connected to the output of each weight accumulator 4 to read the voltage value, which is normal to the value of the coefficient ai (i, 2, ..., N). The outputs of the balance weights 4 are connected to the gate stages 6, which open for the duration of the pulse taken from the pulse sensor 5. The pulse duration is chosen to be shorter than the minimum filtering time, and the pulse repetition period from the pulse setting time 5 is selected.

The outputs of the gate stages 6 are connected to filters 7, whose pulse functions coincide with the Fourier transform of even positive functions of the row. The outputs of the filters 7 are connected to the input of the adder 8, the output of which is connected to the recording unit (oscilloscope) 9.

In determining the coefficients of the decomposition of the spectral density in a series of random

the centered process is fed to the filters. The output voltage of each filter is fed to the dispersion meter 2. The measured dispersion value is fed through block 3

weight coefficients on the adders of the scales 4, the outputs of which are connected to the inputs of the recording devices. The readings of the voltmeters are proportional to the coefficients of the decomposition of the spectral density of the investigated

random process.

The measured values of the coefficients of the decomposition of the spectral density in the series make it possible to unambiguously determine the correlation function, the registration of which is carried out

by gating the voltages from the outputs of the balance weights 4 in the pulse gating unit from the pulse sensor 5. From the outputs of the gating unit, short duration pulses with amplitudes proportional to the values of the coefficients of the decomposition of the spectral density are applied to filters 7. Reactions of filters 7 to these 7 the pulses are simultaneously folded on an oscilloscope I will form a correlation curve

functions of the process under study.

Subject invention

Claims (2)

1. Device for spectral-correlation analysis of random processes, containing frequency filters associated with dispersion meters, summing blocks, control system and recording blocks, characterized in that, in order to simplify the device, there are dispersion meters through coefficients are connected to summing units connected to recording devices. 2. The device according to claim 1, characterized in that, in order to directly obtain the correlation function curve of the process under study, it contains additional summing unit and frequency filters, the inputs of which are connected to the summing units through the gate stages, and the outputs are connected to the additional summing unit associated with a recording device. R -one T