SU760112A1 - Device for determining abscissa of mutual correlation function maximum - Google Patents

Description

The invention relates to the field of automation and computing and can be used in the correlation extreme systems that determine the delay time of one * random noise signal relative to another.

A similar device is known [11, containing the multiplication block delay lines, accumulators.

The disadvantage of the device lies in the fact that when determining mutual! correlation function (ICF) used the sign method, which in some cases leads to a loss of accuracy .. 15

A device [2], selected as a prototype. It contains a summation block and a subtraction block, the first inputs of which are combined and are the first input of the device, '20

the second inputs are combined and are the second input of the device, the output of the summation unit is connected to the input of the multi-split delay lines, the outputs of which are connected to the input of the softening unit, the second input of which is connected to the output of the subtraction unit, / the outputs of the multiplication unit are connected to the input of the integrator unit The outputs of which are connected to the input of the search block - 30

2

to a maximum of ^ mutual correlation function and the input of the block determining the sign of the delay.

The disadvantage of the known device should include the fact that it does not allow; search for the maximum of the mutual correlation function at small delays equal to the autocorrelation interval of the studied signals; which reduces the functionality of the device.

The purpose of the invention is to expand the functionality of the device and improve accuracy with low delays.

This goal is achieved by the fact that the device containing three delay lines, the inputs of the first! and the second lines are the inputs of the device, which are connected respectively to the first and second inputs of the subtraction unit, the summation unit, the output of which is connected to the input of the third delay line, three multiplication units, the input of the first and second multiplication units, respectively, are connected to the second input of the device delay lines and with the first input of the device and the outputs of the second delay line, the inputs of the third block

760112

multiplications are connected respectively to the output of the subtraction unit and to the outputs of the third delay line, and the outputs of the third multiplication unit are connected to the first group of inputs of the integrator whose outputs are connected to,

corresponding inputs of the block - ⁵

maximum divisions, an additional multi-input subtraction unit is introduced, the inputs of the first group of which are connected to the corresponding outputs of the first multiplication unit, and the inputs of the second group are connected to the outputs of the second multiplication unit in reverse order, the outputs of the additional multi-input subtraction unit are connected respectively to the second group of inputs 15 of the block integration, the inputs of the summation unit are connected respectively | But with the last outputs of the first and second delay lines.

The drawing shows the functional diagram of the device.

A device for determining the maximum abscissa of the mutual correlation. the function contains the first and second multi-drop lines 1 and 2 delays, ₂ 5. Extreme outputs of which are connected to the inputs of summation unit 3 and whose inputs are connected to inputs of subtraction unit 4 and inputs of multiplication units 5 and 6 and are device inputs with the input of the main line 7 of the delay, intermediate outputs of all three 'delay lines are connected to the corresponding inputs of blocks b, 5 and 8 multiplication _} output. 6

the multiplications are connected to the second inputs of block 9 in inverse order, the outputs of subtraction unit 9 and the outputs of multiplication unit 40 8 are connected to the corresponding inputs of integrator 10, the output of which is connected to the maximum correlation function determination unit 11. 45

The operation of the device is as follows.

- The signals X (1) under test are received at the device inputs; y (1), which are random noise processes. a) Delay signals X (ΐ--) arrive at the inputs of block 3 summation?

y '(1 -) from the outputs of the additional delay lines, where Έ „ _ΒΤ is the maximum of the autocorrelation intervals of each · of the signals and the cross-correlation.

During the accumulation time in the integra block, the function is calculated

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] [x K) ₉ K l) -yu x (ι ~ l)] <n for o * ₂ o

πρκΐ (I)

ordinates of function (1) are fed to the inputs of block 11 for determining the maximum and calculating the corresponding abscissa. The function K (1) has one maximum positive if the signal x (ί) is delayed relative to the signal y () and negative otherwise. In the event that a maximum of K (1) is in the range -to-GP> maximum abscissa is read into the code for the direct and positive peaks in the inverse code for negative me.ksimumov (assuming that contains 2 ^minutes dots).

Thus, from the description of the operation of the device, it can be seen that the proposed device searches for the maximum of the mutual correlation function over the entire delay interval.

Claims (1)

Claim A device for determining the maximum abscissa of the mutual correlation function, containing three delay lines, the inputs of the cervic and the second delay line are the inputs of the device, which are connected respectively to the first and second inputs of the subtraction unit, the summation unit, the output of which is connected to the input of the third delay line, three multiplication units ,: the inputs of the first and second multiplication units are connected respectively to the second input of the device and the outputs of the first delay line and to the first input of the device and the outputs of the second line from the rear the inputs of the third multiplication unit are connected respectively to the output of the subtraction unit and to the outputs of the third delay line, and the outputs of the third multiplication unit are connected to the first group of inputs of the Integration block whose outputs are connected to the corresponding inputs of the maximum definition unit, characterized in that increase accuracy with small delays, an additional, multi-input subtraction unit is introduced into the device, the first group of inputs of which is connected. To the corresponding outputs of the first multiplication unit, and the second group the inputs are connected to the outputs of the second multiplication unit in the reverse order, the outputs of the additional multi-input subtraction unit are connected, respectively, to the second group of inputs of the integration unit, · the inputs of the summation unit are connected respectively to the last outputs of the first and second delay lines.