SU641464A1 - Correlometer testing device - Google Patents

Description

I

The invention relates to the field of computing technology and can be used to create equipment that simulates the operating signals of control systems, automation, etc., as well as when testing measuring instruments that work with random signals of statistical characteristics analyzers, among which the most common are correlometers.

A device comprising a generator, a primary noise source, a forming filter and a non-linear converter ij is known.

The lack of analogue is associated with low signal stability and low functionality.

It is known device 2 (prototype) generating signals, which can be used as test for calibration of correlometers. The prototype contains a block for setting multiplication factors, a block for generating signals, a block for specifying a mix, a block

shaping filters, the output of which is connected to the first input of the smart unit, the output of which is connected to the first bias input, the output of which is connected to the input of the unit, level matching.

In addition to the eiToro, the known device contains a stochastic switch,

The disadvantage of the known device 2j, generating signals that

can be used as test correlomers when checking, in other words, devices for checking correlometers, is the essence of the reproduction error and

the formation of statistical characteristics of the generated signal and, consequently, a significant error in the calibration of analyzers of statistical characteristics, in particular, correlometers.

Tsetsyu proposed invention

is an increase in the accuracy and stability of signal generation for calibration of correlometers.

This circuit is achieved by adding a frequency matching block and a KOMN TaiMH block to a known calibration device for correlometers, the control input of which is connected to the first output of the frequency matching block, the first, second and third groups of switches of the switching block are connected respectively to the outputs signal shaping units, setting multiplication factors and bias setting, and the outputs of the communication unit are connected respectively to the input of the shaping filter unit and to the BTOpbfM inputs of the multiplication unit and cm, also and the second output matching block connected to a frequency controlled PWM w Inputs signal generating unit.

The drawing shows a block diagram of the proposed device.

The device contains a signal shaping unit 1, a shaping filter unit 2, a multiplication unit 3, a coefficient setting unit multiplied 11 4, an offset unit 5, a block specified {Ш offset 6, a matching unit for level 7, a switching unit 8 and a matching unit for frequency 9, Outputs The signal conditioning unit 1 is connected via the switching unit in to the input of the shaping filter unit 2, the output of which is connected to the first input of the multiplication unit 3, the output of which is connected to the first input of the displacement unit 5. The output of the last level matching unit is connected to device output. The outputs of the multiplication factor setting unit 4 are connected via the switching unit 8 to the second input of multiplication unit 3, and the outputs of the offset setting unit 6 are connected through the switching unit 8 to the second input of the offset unit sh 5, the signal conditioning unit 1 is connected via frequency matching unit 9 switching unit 8.

The proposed device works as follows. In the signal conditioning unit 1, a series of uncorrelated signals is formed, which in some sequence is indifferent to which, but unchanged over the length of the test signal realization, are connected using the mutation unit 8 to the shaping filter unit 2. Moreover, the switching frequency of the switch is the same and is selected depending on the signal from the block

matching by frequency 9 so that it would be h times greater than the maximum rate of change of any of the h source signals. Synchronously with the connection of one of the Vt source signals to block 2, the corresponding multiplication factor of the multiplication factor setting unit 4 is connected through the switching unit 8 to the multiplication unit 3, and the corresponding offset from the offset setting unit 6 is connected through the switching unit 8 to the shifter 5. In this case, the signal from the output of block 2 of the shaping filters is multiplied by a certain coefficient, thereby acquiring the required dispersion, and then is stored with a certain offset, acquiring the required average Achen. The ordinates of the signal thus generated arrive at the level matching unit.

On the next clock cycle, the switch position is formed and supplied to the output of the ordinate of another of the P source signals. After polling all AND source signals, the switch again connects to the output of the device the next ordinate of the first simplified signals, etc.

Claims (1)

The use of the proposed device allows one day to read the parameters of a given distribution law through the parameters of the normal distribution of the original signals. In this case, the sum of the ordinates of the laws of the distribution of the original signals for any given abscissa should be equal to the ordinate of the given law (of course, taking into account the scale). The specified correlation function is formed in a linear system that provides sufficient for the purposes of verification errors of forming and reproducing ordinates of the generated statistical characteristics. The normalized values of the correlation function of the original signal (discrete samples) coincide with the normalized values of the output signal correlation function. It should be noted that between the samples of the correlation function of the output signal, which coincide in argument with the samples of the original signal, the values of the correlation function appear that fill the interval between samples with a step corresponding to 1 / M of this time interval, These values are curvature. Because of the presence of a mix in the initial signals, the cyclic expressions of the indicated values of the correlation function, the elementary time intervals (corresponding to the interrogation frequency of the switch) are the same. Since they can be compared with the noise level in the correlation function of the output signal, which is constant over the entire correlation interval and calculated exactly, for the verification purposes, these distortions of the correlation function of the test signal can be considered insignificant. The use of only one channel for the formation of statistical characteristics of the output signal eliminates the composition of the reproduction error, which is caused by the non-identity of P channels similar in structure to the channels. The well-known and constant polling mode of the switching unit allows, on the one hand, to simplify the selection of the initial signal parameters when generating a given distribution law, and, on the other hand, to significantly reduce the component of statistical origin in the error of reproduction of the correlation function and the test signal distribution law (it is possible to completely remove this component due to the choice of a specific block diagram of the driver AND source signals). Generating an output signal by mixing (or iterating over) the ordinates of the original signals, and not the segments of their realizations, makes it possible to form a stationary test signal whose dispersion and mean value are known. Thus, the use of the proposed device allows the formation of test signals with a permissible error of reproduction and the formation of a given and controlled 64 correlation function and the law of distribution of these signals. Claims An apparatus for checking correlometers, comprising a block for setting multiplication factors, a block for generating signals, a block for specifying an offset, a block for shaping filters, the output of which is connected to the first input of a multiplier, the output of which is connected to the first input of the offset block, the output of which is connected to the input of the block agreed on a level that is different from the fact that, in order to control the operation of the device, a frequency matching block and a switching block controlling the input of which O is connected to the first output of the matching unit by frequency, first, second and third groups of inputs of the switching unit are connected respectively to the outputs of the signal conditioning units, setting the multiplication factors and setting the offset, and the outputs of the switching unit are connected in accordance with the input; A block of forms of filtering filters and to the second inputs of the multiplication unit and a block of displacement, the second output of the block of matching in frequency is connected to the control input of the block | world signals. Sources of information taken into account in the examination: 1, Bobnev M, P, Generation of random signals, M, Energie, 1971, p. 54-71. 2, Zhovinsky A, H ,, Zhovinsky V, H, the formation of processes with an arbitrary distribution density by the rancization method. Proceedings of the U1 All-Union Symposium, Methods of representation of instrumental analysis of random processes in fields, Yerevan, 1973.