SU1495813A1 - Device for determination of correlation function of transient characteristics of broad-band filter - Google Patents

Abstract

The invention relates to specialized means of instrumentation engineering and is intended to determine the correlation function of transient characteristics. The aim of the invention is to enhance the functionality by determining the mutual correlation function and improving accuracy. The device contains 1 pulse generator, delay element 17, wideband filter 7, time interval recorder 2, amplifier 12, quadratic detector 13, keys 10, 11, 14, integrator 15, display unit 16, counter 3, controlled 4 pulse generator, generators 5, 6 harmonic signals, adders 8, 9. The device, based on measurements of the auto- and mutual correlation functions of the signals at the input and output of the filter, makes it possible to determine the impulse response as well as the amplitude and phase-response characteristics of the filter using the Fourier transform. tra. 1 il.

Description

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O1

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The invention relates to specific instrumentation of measurement instrumentation and can be used to determine the pulse transient function (ICP), as well as: The same amplitude-frequency (AFC) and phase-frequency (PFC) characteristics of complex devices B Pvizotechnical production

The aim of the invention is to enhance the functionality by defining a mutual correlation function and increasing accuracy 1. The drawing is a functional diagram of the device.

The device contains 1 pulse generator, 2 time interval recorder, counter 3, 4 pulse controlled generator, 5 | and 6 harmonic wave generators, wideband filter 7, adders 8 and 9, switches 10 and 11, amplifier 12, quadratic detector 13, key 14, integrator 15, display unit 16, delay element 17.

The device works as follows.

; The output pulses of the quartz Reference Generator 1 are fed to the recorder 2 in the in-belt intervals, to the generator 5 harmonic signals, and also to the controlled one: generator 4, from the output of which the pulses go to another input of the recorder 2 time intervals , counter 3 and generator 6 harmonic signals. Generators 5 and 6 produce coherent radio pulses of the required form and duration C of generator 5 formed radio pulse 1 (Ax) (t) A (t) cosa) ot receives jua input of adder 9 and input to wideband filter 7, from which output the signal By (.t) B (t) cosWgt is delivered to the input of the adder 8, from the generator 6 formed with the required: delay radio pulse A t +) “A ((Wflt + 1Гп) goes to the inputs of the adder 9 and 8. As a result, at the outputs of the adders 8 and 9 consistently receive the corresponding sums of harmonic oscillations of two signals

A, (t) + A, (t + r) J; () B, (t) + Ax (t +1)). (2)

. The obtained harmonic sums, oscillations from adders 8 and 9 through

the corresponding keys 10 and 11, which determine the type of the determined correlation function, are fed to the amplifier 12, then are squared on the quadratic Detector 13 and fed through the key 14 to the integrator 15, where the samples of the mutual correlation function (ICF) are accumulated

t Bxy (t) 2 A ft + f) -B (t) dt +

+ UA, (t) dt, (t +1) dt +

-SCBy (t) dt; (3). if samples of the autocorrelation function (ACF)

Xx

(t) 2 A. (t + -). A, (t) dt +

0 5

0 5 0 5

0

five

+ (t +) + (t) -dt. (four)

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As soon as the counter 3 accumulates for the CCF or ACF the number of pulses multiple of 10, for example JOOO, a signal appears at its output that acts on the key 14, prohibits further passage of the signals to the integrator 15 and starts the display unit 16, which is, for example, a digital voltmeter, which measures the values of the ordinates B | SF and ACF, At this time, while the ordinates of the CCF and ACF are being measured, the signal from counter 3, the generator, 4 pulses, causes it to change the delay time by at the entrance Timer 2, stops the delay duration measurement procedure. As soon as the ordinate; The CCF or ACF is measured, at the output of the delay element 16 a signal appears that resets the integrator 15 and zeroes the counter 3, as a result the key 14 opens, the counter 3 starts to count the number of trigger pulses, and the meter 2 measures their duration, Kotor is equal to ( r +, (3 i7). The cycle is repeated, but the next ordinate of the CCF or ACF is already determined.

Thus, changing the duration of the delay on the generator 4, receive sequentially the ordinates of the CCF and ACF. (3), (4). This makes it possible to determine the IAP, frequency response, and phase response for the wideband filters by means of the Fourier transform, using the obtained values of the ACF and ACF.

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1 formula of invention

A device for determining the correlation function of the transient characteristics of broadband filters comprising a controlled pulse generator, time slot recorder, first switch, amplifier, quadratic detector, integrator, counter, display unit, delay element, the output of the controlled pulse generator connected to the recorder stop input time intervals and with the counting input of the counter, the overflow output of which is connected to the reset input of the time interval recorder, with the delay setting input controllable pulse generator, with a control input of the first key, with a write enable input of the display unit, and through a delay element with counter zeroing inputs and an integrator, the output of which is connected by a synchronization input of the display unit, the output of the amplifier is connected via an quadratic detector to the information input the first key, the output of which is connected to the information input of the integrator, characterized in that, in order to expand the functions

1 of the possibilities by determining the mutual correlation of the iop function and increasing the accuracy, a pulse generator, two harmonic signal generators, two adders, a second and a third key are entered in Hei o, the output of the pulse generator is connected to the trigger input of the time recorder and clock inputs pulse generator and the first and second harmonic signal generators, the output of the first harmonic signal generator is connected to the first input of the first adder and is the device output for connecting to the broadband filter input, the first input of the second adder. is the input of the device for connecting to the output of the broadband filter, the output of the second harmonic signal generator is connected to the second inputs of the first and second adders, the outputs of the first and second adders are connected to the information inputs of the second and third keys, respectively, whose outputs are connected to the first and second inputs of the amplifier, respectively , the control inputs of the second and third keys form the input of the setting of the measurement mode of the correlation function.

Claims (1)

Claim A device for determining the correlation function of the transient characteristics of broadband filters, containing a controlled pulse generator, a time interval recorder, a first key, an amplifier, a quadratic detector, an integrator, a counter, an indication unit, a delay element, the output of a controlled pulse generator being connected to a stop input of a time interval recorder and with a counter input 15 of the counter, the overflow output of which is connected to the reset input of the time interval recorder, with the delay job input a controlled pulse generator, with the control input 20 of the first key, with the recording permission input of the display unit, and through the delay element, with the inputs of zeroing the counter and integrator, the output of which is connected to the information input of the display unit, the amplifier output is connected through the quadratic detector to the information input of the first key whose output is coupled to the data input of the integrator, characterized in that, in order to expand funk13 ⁶ rational capabilities by determining the cross correlation function and increased I’m accurate, a pulse generator, two harmonic signal generators, two adders, a second and a third key are introduced into it, and the pulse generator output is connected to the start input of the time interval recorder and to the clock inputs of a controlled pulse generator and the first and second harmonic generators, the output of the first the harmonic signal generator is connected to the first input of the first adder and is the output of the device for connecting to the input of the broadband filter, the first input of the second adder. is the input of the device for connecting to the output of the broadband filter, the output of the second harmonic signal generator is connected to the second inputs of the first and second adders, the outputs of the first and second adders are connected to the information inputs of the second and third keys, respectively, the outputs of which are connected to the first and second inputs respectively amplifier, the control inputs of the second and third keys form the input of the setting of the measurement mode of the correlation function.