SU811288A1 - Device for correlation processing of signals - Google Patents

Description

The invention relates to the field of specialized computing equipment and can be used for optimal signal processing in real time with the presence of correlated interference, changing its characteristics from implementation to implementation, in radiolocation, radio navigation, radio communication, etc.

A correlation device is known for optimal signal processing in the presence of additive normal correlated interference under conditions of change from realization to realization of the form of the correlation function of interference 1. This device consists of two tunable optimal against the background white noise filters with orthogonal Laguerrean analyzers loaded on a subtractor connected to the first inputs of the calculator, the second inputs of which are supplied with voltage from the orthogonal Laguerrean analyzer of the useful signal, and the output The calculator is connected to the first inputs of the multiplier line, the second inputs of which are supplied with voltage from the outputs of the orthogonal Laguerrean analyzer of the input signal and interference mixture, and the outputs are connected to an adder whose output is the output of the device.

The input signal and interference mixture is fed to an optimal tunable filter with an orthogonal Laguerrean analyzer, the output of which forms the orthogonal spectrum of the input mixture correlation function. On the other tunable optimal filter with the Laguerre orthogonal analyzer, the orthogonal spectrum of the correlation function of the signal is formed. At the output of the subtractor, an orthogonal spectrum of the interference correlation function is formed. The computing device from the orthogonal spectrum of the signal and the correlation function of the noise forms the orthogonal spectrum of the impulse response of the optimal Φ; 1 liter, to which the input mixture of signal and interference is fed. The latter passes through the Laguerre orthogonal analyzer and is multiplied by the formed orthogonal spectra of the optimal impulse response of the optimal filter. All outputs of the multipliers are connected to an adder, the output of which forms the desired optimal correlation function.

This device implements the method of constructing optimal filters in accordance with the decision of equilibrated optimal filtering, based on the representation

input signals, the correlation functions of interference, and the nominal impulse response in the form of orthogonal series over the selected system of orthogonal functions.

This device is complicated (especially the computing unit) and can be used for a limited number of bases.

It is known device 2, which consists of a multi-channel correlator torus loaded on an amplifier, a line of multipliers-averagers and a line of two-channel adders, which include the line of inverters. The output of the amplifier, which is the output of the device, is connected to the first inputs of the multiplier-averaging line, the second inputs of which are orthogonal components of the interference voltage, and the outputs of the multiplier-averaging line are loaded through the inverter line to the first inputs of the two-channel adder line, to the second inputs of which orthogonal signal voltage components are provided. The outputs of the line of two-channel adders are loaded on the second inputs of the multichannel correlator, on the first inputs, the orthogonal components of which are the input signal and noise interferences.

The drawback of the device is that of forming an optimal correlation integral algorithm only for zero delays.

The closest but to the composition of the equipment to the described device is a correlator containing two Laguerre filters, a multiplication-averaging unit, a multiplication unit and a multi-input adder 3.

In such a device, it is impossible to obtain in real time an optimal correlation function with normal additive disturbances that change the spectral properties from realization to realization.

The purpose of the invention is to eliminate this drawback.

This goal is achieved in that the device for optimal signal processing, containing the first and second Laguerre filters, whose inputs are the first and second inputs of the device, respectively, multiply-averaging block, the nerve input of which is the third input of the device, and the outputs are connected to the first group of inputs of the multiplication unit, the second group of inputs of which are connected to the corresponding outputs of the second Laguerre filter, the outputs of the multiplication unit are connected to the corresponding inputs of the my-input adder, introduced many tional correlator inverter and two-input adder, the first input of which is the fourth input unit, a second input connected to the output of an inverter whose input is connected to the output multi-input adder. The inputs of the first group of multichannel correlator are connected to the corresponding outputs of the first Laguerre filter, the inputs of the second group of multichannel correlator are connected to the output of a two-input adder, and the outputs of the multichannel correlator are connected to the corresponding inputs of the multiplication-averaging unit, which is the input of the device, loaded on the first the multi-channel correlator inputs, the outputs of which are the outputs of the device and are connected to the first inputs of the multiplier-averager line, to the second inputs of which interference voltage is applied, and the outputs are connected to the first inputs of the multiplier line, the second inputs of which are connected to the corresponding outputs of the second line of orthogonal Laguerre filters, to which a trigger delta pulse is applied. The outputs of the multiplier line are loaded on a multi-channel adder, the voltage from which is fed through the inverter to the first input of a two-channel adder.

The drawing shows the functional scheme of the device.

The device contains a Laguerre nerve filter /, a multichannel correlator 2, a multiplication-averaging unit 3, a multiplication unit 4, a second Laguerre filter 5, a multi-input adder 6, an inverter 7 and a two-input adder 8.

The Laguerre filter 1 input is one of the device inputs. The outputs of the Laguerre filter / are connected to the first inputs of the correlator 2, the outputs of which are the outputs of the device. The outputs of the correlator of torus 2 are connected to the inputs of the first group of block 3 multiplication-averaging. To the second inputs of which the interference is applied. The outputs of block 5 are connected to the cord inputs of multiplier 4, the second inputs of which are loaded on the corresponding outputs of the Laguerre filter 5. A delta pulse is applied to the input of the Laguerre filter 5. The outputs of multiplication unit 4 are connected to the inputs of adder 6, the output of which through inverter 7 is connected to the first input of adder 8, to the second input of which a signal voltage is applied. The output of the adder 8 is connected to all the second inputs of the correlator 2.

The device receives an additive mixture of signal and interference, which, passing through the Laguerre filter 1, is fed to the first inputs of correlator 2. The voltage from the outputs of correlator 2, which is output, is multiplied with noise and is averaged by multiplying unit 3, averaging , the voltage from the outputs of which is fed to the first inputs of the multiplication unit 4, to the second inputs of which is supplied the voltage from the Laguerre filter 5,

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excited at the time of the formation of the output voltage of the device delta-impulse. The output voltage from multiplier 4 is fed to the adder 6, passes through the inverter 7 and is fed to the first input of the adder 8, to the second input of which the signal voltage is applied. The output of the adder 8 is connected to the inputs of the second group of the correlator 2.

The desired correlation function is represented in the device as decomposition coefficients in the Laguerre basis at the output of the correlator 2.

Let us show that the proposed device performs an on-take of the correlation function, optimal in the sense of obtaining at the output the maximum value of the ratio of the signal voltage to the root-mean-square value of the interference voltage during additive fluctuation normal noise with a correlation function varying from implementation to implementation.

Such a correlation function is derived from

B (T-) lu, +, (t) V (,

P

where C / s + n (t) is the input additive mixture of signals and interferences, and V (t) is found from equation

1 / (5) Ye (5) J / ,, (T) l / (.- S) d o

where () autocorrelation is a hindrance function.

{/ s (5) - realization of the signal.

If the autocorrelation function of the interference is represented as

R, () lu, +, (t} .U (.) Dt, o

where and "(t) is the implementation of interference, then

U (S) U, IS} - lu (i} B (. O

We represent B (t; t) as a series on an orthonormal basis.

b (7; t) g. a „(0-6p (t)

Where

a, (t) lB (t- T) (T) d. Jn (t) V (t) dt.

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Here, / n (/) - is the voltage at the output of the orthogonal filter with impulse response (O when the input realization is applied to it. Therefore, for a capacitor (t, the input realization of the signal and the interference and voltage should be fed to the correlometer with approximation) V (t), which can be obtained from a „according to the following algorithm

K (S) fy, (S) - V. „(S) lu, (t) a ,, (f) dt.

The proposed device makes it possible to obtain, in real time, an optimal correlation function for additive fluctuation normal noise with a variable from realization to realization autocorrelation function. This device, unlike the known ones, allows to obtain an optimal correlation function for all values of

its argument, which will allow it to be used for estimating the parameters of signals in complex noise situations.

Claims (3)

1. “Radio engineering and electronics, t. 20, 1975, No. 3, p. .647. 2. “Radio engineering and electronics, vol. 19, 1974, No. I, p. 24:15 3.Zhobinsky V.N., Arkhovsky V.F. Correlation devices. M., “Energie, 1974, p. 46 (prototype). V / x