RU2497285C1 - Method of detecting radio-electronic equipment - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: method involves further multiplication and low-pass filtering of the output voltage of each antenna element with reference signal voltages corresponding to all antenna elements and presenting the multiplication and filtration results in form of a cross-correlation matrix of signals; performing corresponding multiplication, summation and subtraction operations with signals of corresponding elements of the cross-correlation matrix of signals to obtain the determinant of the cross-correlation matrix of signals; finding the maximum value of the determinant of the cross-correlation matrix of signals and, for the maximum value of the determinant of the cross-correlation matrix of signals, based on reference signal parameters, determining the frequency value and direction of arrival of the signal of continuously emitting radio-electronic equipment.

EFFECT: detection of signals of continuously operating radio-electronic equipment.

9 dwg

Description

A method of detecting electronic equipment relates to the field of radio engineering, and can be used to monitor changes in the electronic environment, detect signals of electronic devices, measure their frequencies and directions of arrival of signals when it is implemented in the technique of radio monitoring and radio suppression of radio communications.

Currently, the following methods are known for detecting electronic equipment implemented by search methods described in the book by Borisov V.I., Zinchuk V.M. Interference immunity of radio communication systems. Probabilistic-time approach. Radio and Communications, 1999, pp. 47-56, 62-71:

parallel (multi-channel);

serial (single channel);

parallel-serial search (combined).

. Обнаружение осуществляется с использованием N неперестраеваемых радиоприемников (или N-канального радиоприемника).In parallel search, the search range Δf is divided into a number of elementary channels (subbands) Δf _Э wide $$\Delta f_E=\raisebox{1ex}{$\Delta f$}\!\left/ \!\raisebox{-1ex}{$N$}\right.$$

. Detection is carried out using N non-tunable radios (or N-channel radios).

Moreover, in each channel, an analysis of the input effect is simultaneously performed in order to establish the presence or absence of a signal at the input of the radio receiver. The disadvantage of the parallel search method: hardware redundancy of the search post, its high cost.

In single-channel (sequential) search, an overview of the entire search range is performed by sequentially tuning one radio receiver from the beginning to the end of the range and analyzing during the tuning of the input exposure in order to establish the presence or absence of a signal at the radio input. A sequential search is simple and economical to implement, however, it has a significantly longer average search time than a parallel search. At a low tuning rate, there is a high probability of missing (undetected) signals of short duration. An increase in the tuning speed leads to a decrease in the sensitivity of the radio receiver and dynamic measurement errors of the signal parameters (frequency, amplitude, etc.).

The combined search method provides a combination of the advantages of parallel and sequential search methods and a compromise between the required efficiency and cost, but does not completely eliminate the disadvantages inherent in the methods described above: the redundancy of the equipment is preserved, and the search time for solving some radio monitoring tasks remains unacceptably large.

There are also known methods of detecting signals of electronic devices based on the use of spatial signal processing methods implemented by multichannel devices, which include multi-element antenna systems (AS), see, for example, Paula A., Kaula T. Eigenstructure methods for direction of arrival estimation in the presence of unknown noise fields. "/ IEEE Trans." 1986. V.ASSP-34, c.13-20, RF patent No. 2341024, RF patent No. 2292650, which, due to the implementation of searchless detection of signals and direction finding of their sources, provide a significant reduction in time spent on detection of electronic equipment starting or stopping radiation in comparison with the above "classic" detection methods.

The closest known method for detecting electronic means is the method according to the patent of the Russian Federation No. 2292650, adopted as a prototype.

The prototype method consists in receiving signals with a multi-element antenna system, amplifying, multiplying and low-pass filtering the output voltage of each antenna element with the output voltages of all antenna elements and presenting the results of multiplication and filtering in the form of a correlation matrix of signals, delaying these signals for a delay time τ _s , the value of which provides the conditions that the probability of changes including the impact on the multi-element antenna system for the time τ _of a signal it one is negligibly small, element by element subtraction of signals from the current and delayed matrices signals and presentation of the subtraction results as difference signal correlation matrix, which is a nonzero matrix in the case of changing the number of the emitting electronic means for a time period equal to τ _s and represents the correlation matrix appeared or a signal that has disappeared, determining the values of the operating frequency and the direction of arrival of the signal of the electronic means that has stopped or has begun radiation for this period of time using sequentially generated reference signals corresponding to the design of the antenna system, with all possible combinations of frequencies, azimuths and elevation angles in a given range that differ from each other by resolution values for these parameters, measuring the polarity of the difference correlation matrix of the signal and determining by its value of belonging of the signal to electronic means that stopped or started radiation, records the values of the operating frequency, the direction of arrival with the needle separately for the signal of the electronic means that stopped the radiation and the signal of the electronic means that started the radiation, comparing the values of the working frequency and the direction of arrival of the signal of the newly appeared radiation with all the recorded values of the working frequencies and directions of the arrival of signals of the electronic means that stopped the radiation, and determining the radiating electronic means, changed the operating frequency, based on the direction of arrival of the signal of this electronic means.

The disadvantage of the prototype method is that it does not provide for the detection of signals of electronic means continuously working for a long time, that is, it does not provide for the detection of signals of electronic means that started and continues to emit until the beginning of the application of this method.

The objective of the invention is the expansion of the functionality of the method for detecting electronic means by providing the ability to detect signals of continuously operating electronic means.

To solve the problem in a method for detecting electronic equipment, which consists in receiving signals with a multi-element antenna system, amplifying, multiplying and low-pass filtering the output voltage of each antenna element with the output voltages of all antenna elements and presenting the results of multiplication and filtering as a correlation matrix of signals, delaying these signals for the delay time τ _s , the value of which ensures that the condition that the probability of a change in the number of them in a multiple antenna system for a time τ _of the signals for more than one is negligibly small, element by element subtraction of signals from the current and delayed matrices signals and presenting the results of subtracting a difference signal correlation matrix, which is a nonzero matrix in the case of changing the number of the emitting electronic means for a time period equal to τ _s and represents the correlation matrix of the signal that appeared or disappeared, determining the values of the working frequency and the direction of arrival from it the signal of a radio electronic device that has stopped or started emitting during this period of time using sequentially generated reference signals corresponding to the design of the antenna system, with all possible combinations of frequencies, azimuths and elevation angles in a given range that differ from each other by resolution values for these parameters, measurement the polarity of the difference correlation matrix of the signal and determining by its value that the signal belongs to electronic means that have stopped or started radiation, recording the values of the operating frequency, the direction of arrival of the signal separately for the signal of the electronic means that stopped the radiation and the signal of the electronic means that started the radiation comparing the values of the working frequency and the directions of arrival of the signal of the newly appeared radiation with all the recorded values of the working frequencies and directions of the arrival of signals of electronic means that stopped radiation, and determining a radiating electronic means that has changed the operating frequency, according to the direction the arrival of the signal of this electronic means, according to the invention, additionally carry out multiplication and low-pass filtering of the output voltage of each antenna element with the voltage of the reference signal corresponding to all antenna elements and presenting the results of multiplication and filtering in the form of a mutual correlation matrix of signals, perform the corresponding operations of multiplication, addition and subtraction with the signals of the corresponding elements of the mutual correlation matrix of signals, resulting in a cat They receive the determinant of the mutual correlation matrix of signals, find the maximum value of the determinant of the mutual correlation matrix of signals, and at the maximum value of the determinant of the mutual correlation matrix of signals, determine the value of the frequency and direction of arrival of the signal of the continuously emitting electronic means.

In the study of other well-known technical solutions in the art, the specified set of features that distinguish the invention from the prototype was not identified.

The proposed method is as follows.

The signals are received by a multi-element antenna system, their amplification. The multiplication and low-frequency filtering of the output voltage of each antenna element with the output voltages of all antenna elements is performed and the results of the multiplication and filtering are presented in the form of a correlation matrix of signals, then the delay of these signals for a time τ _s (the value of τ _s should ensure that the condition that the probability of changing the number signals affecting the antenna system by more than one is negligible). The element-by-element subtraction of the signals of the current and delayed matrices and the presentation of the results in the form of a difference correlation matrix of the signal. (The matrix is a nonzero matrix in the case of a change in the number of emitting radio-electronic means during the delay time and is a correlation matrix of the signal that appears or disappears). The determination by this matrix of the values of the working frequency and the direction of arrival of the signal of the electronic means that has stopped or started the radiation during the delay time. (To do this, we use sequentially generated reference signals corresponding to the design of the antenna system, with all possible combinations of frequencies, azimuths, and elevation angles in a given range that differ from each other by resolution values for these parameters). Measuring the polarity of the difference correlation matrix of the signal and determining by its sign that the signal belongs to electronic means that have stopped or started radiation. Recording the values of the operating frequency, the direction of arrival for the signal of the electronic means that stopped the radiation and the signal of the electronic means that started the radiation in the corresponding storage device. Comparison of the values of the working frequency and the direction of arrival of the signal of the newly appeared radiation with all recorded values of the working frequencies and directions of arrival of the signals of the electronic means that stopped the radiation, and the determination of the radiating electronic means that changed the working frequency (based on the direction of arrival of the signal of this electronic means). Multiplication and low-pass filtering of the output voltage of each antenna element with the voltages of the reference signal corresponding to all antenna elements and presenting the results of multiplication and filtering in the form of a mutual correlation matrix of signals. Performing operations of multiplication, addition and subtraction (according to the well-known algorithm) on the signals of the corresponding elements of the mutual correlation matrix of signals to obtain its determinant. Search for the maximum value of the determinant of the mutual correlation matrix of signals. Determination of the frequency and direction of arrival of the signal of a continuously emitting electronic means (they correspond to the parameters of the reference signal at the maximum value of the determinant of the mutual correlation matrix of signals).

Figure 1 shows a structural diagram of a device explaining the essence of the proposed method for detecting electronic means, figure 2 is a layout of the antenna elements of the antenna system, figure 3 is a structural block diagram of the correlation matrix of signals, figure 4 is a structural diagram of a correlator, included in the block of the correlation matrix of signals, figure 5 is a block diagram of a block of a mutual correlation matrix of signals, figure 6 is a block diagram of a unit for determining the frequency and spatial parameters of signals, figure 7 - trukturnaya block diagram of the determinant of the cross correlation matrix of signals in Figure 8 - schematic diagram determination unit determinant maximum cross correlation matrix of signals 9 - timing charts for explaining the essence of the proposed method.

In figure 1, the following notation:

1 - multi-element antenna system (AS);

2 - amplifier;

3 - block correlation matrix of signals (CCM);

4 - block mutual correlation matrix of signals;

5 - subtractive device;

6 - block delay lines;

7 - block determinant of the mutual correlation matrix of signals;

8 is a block for determining the sign of the difference correlation matrix of signals;

9 - unit for determining the frequency and spatial parameters of the signals;

10 - block determining the maximum determinant of the mutual correlation matrix of signals;

11 - memory device parameters of the signals of electronic means that have stopped the radiation;

12 - storage device parameters of the signals of electronic means that started the radiation;

13 - memory device parameters of the signals of constantly emitting electronic means;

14 is a block comparison;

15 - block accounting error estimation;

16 - control device;

In figure 3, the following notation:

17.1-17.9 - correlators.

In figure 4, the following notation:

18 - multiplier;

19 - low-pass filter.

In figure 5, the following notation:

20.1-20.9 - correlators.

Figure 6 adopted the following notation:

21.1-21.3 - generators of parameter values;

22 - block generating reference signals;

23 is a block correlation matrix of the reference signal;

24 - subtractive device;

25 is a block estimates the difference;

26 - Converter "parameter - digital code";

27 - generator control unit;

28 is a block of registers.

In Fig.7, the following notation:

29.1-29.12 - multipliers;

30.1, 30.2 - adders;

31 is a subtractive device.

In Fig.8, the following notation:

32 - level code register;

33 - analog-to-digital Converter;

34 is a comparison block.

In Fig.9, the following notation:

U ₁ ... U ₃ - voltage signals at the input of AC 1;

U _BOS - voltage signals at the output of the block determining the sign of the differential KMS 8;

U _BO - voltage signals at the output of the block determinant mutual CMC 7;

U _BOM - voltage signals at the output of the unit determining the maximum of the determinant of mutual CMC 10;

U _UU - voltage signals at the output 16 of the control device.

A device that explains the essence of the proposed method for detecting electronic devices, contains a series-connected multi-element antenna system 1, amplifier 2, a block of the correlation matrix of signals 3, the output of which is connected to the inputs of the subtractor 5 and the block of the delay line 6, the output of which is connected to the second input of the subtractor 5 the output of which is connected to the input of the unit for determining the sign of the difference correlation matrix of the signal 8 and to the corresponding input of the unit for determining the frequency and spatial of the signal parameters 9, the first output of which is connected to the information inputs of the memory of the parameters of the signals of electronic devices that have stopped emitting 11, the memory of the parameters of the signals of electronic devices that have started the radiation 12 and the memory of the parameters of the signals of the constantly emitting electronic means 13, whose outputs are connected to the corresponding inputs a comparison unit 14, the output of which is connected to the first input of the device equation 16, the output of which is connected to the control inputs of the maximum determination unit of the determinant of the cross-correlation matrix of signals 10, the memory of the signal parameters of the electronic means that stopped the radiation 11, the memory of the parameters of the signals of the electronic means that started the radiation 12, the memory of the parameters of the signals of the constantly emitting electronic means 13 , comparison unit 14 and the second control input of the unit for determining the frequency and spatial parameters signals 9.

In addition, the interconnected block of the mutual correlation matrix of signals 4, the determinant block of the mutual correlation matrix of signals 7 and the unit for determining the maximum determinant of the mutual correlation matrix of signals 10, the output of which is connected to the first control input of the unit for determining the frequency and spatial parameters of the signals 9 and to the third input of the device control 16. In this case, the second output of the unit for determining the frequency and spatial parameters of the signals 9 is connected to the second input of the cross-correlation unit translational signals die 4, a first input coupled to an output of the amplifier output unit 2. Moreover, determining the sign of the difference signal of the correlation matrix 8 connected to the second input of the control device 16.

The blocks used in the device implementing the proposed method can be implemented as follows.

Antenna system 1 in the General case is an N-element antenna array (as an example, figure 3 shows a 3-element).

Amplifier 2 is an N-channel amplifier.

The block of the correlation matrix of signals 3 represents (N × N) correlators, the output signals of which characterize the correlation between the signals in the corresponding antenna elements, and for the case under consideration, the 3-element AS can be implemented according to the scheme shown in Fig. 3. The correlators 17.1 ... 17.9 included in the KMS unit 3 are widely used in signal processing devices of multichannel speakers, for example, Yampolsky V.G., Frolov O.P. Antennas and EMC. - M .: Radio and communications, 1983, p. 235 fig. 10.10, p. 240, fig. 10.16, Venskauskas K.K. Compensation for interference in marine radio systems. - L .: Shipbuilding, 1989, p.111, fig. 2.31 and can be implemented according to the scheme, Fig. 4 in the form of series-connected multiplier 18 and a low-pass filter 19.

Block mutual correlation matrix of signals 4 is a (N × N) correlators, the output signals of which characterize the mutual correlation between the input and reference signals and can be implemented according to the circuit shown in Fig.5. The correlators 20.1 ... 20.9 included in the mutual CCM block 4 are similar to the correlators 17.1 ... 17.9.

The subtractor 5 is a set of functional units (the number of which is determined by the number of signals that make up the KMS), and can be implemented using appropriate differential amplifiers that implement the operations of subtracting signals.

Block delay lines 6 contains N × N identical delay lines and can be implemented based on ultrasonic delay lines.

The unit of the determinant of the mutual correlation matrix of signals 7 is a combination of multipliers, adders and a subtractor, interconnected by inputs and outputs for the operation of finding the determinant Δ of the mutual correlation matrix. The rule for finding the determinant of a square matrix is well known, see, for example, Bronstein I.N., Semendyaev K.A. Handbook of mathematics for engineers and university students - M .: Nauka, 1986, p. 158 and for the case under consideration 3-element AS unit of the determinant of the mutual correlation matrix of signals 7 can be performed according to the structural diagram shown in Fig.7. The output voltage of this block is proportional to the value of the determinant of the mutual correlation matrix.

The unit for determining the sign of the difference correlation matrix of signals 8 can be implemented using logic elements.

The unit for determining the frequency and spatial parameters of the signals 9 can be performed according to the structural diagram shown in Fig.6. It contains serially connected unit for generating reference signals 22, a unit for correlation matrix of reference signal 23, a subtractor 24, a unit for estimating the difference 25, a block of registers 28, and a control unit for generators 27, generators of parameter values 21.1 ... 21.3, the inputs of which are connected to the corresponding outputs generator control unit 27, a parameter-to-digital code converter 26, the inputs of which are connected to the corresponding inputs of the reference signal generation unit 22 and the outputs of the corresponding signal generators cheny parameters 21.1 ... 21.3, and outputs connected to respective inputs of the register file 28.

The unit for determining the maximum of the determinant of the mutual KMS 10 can be implemented according to the scheme for determining the maximum of the signal used in the panoramic detector R-381 T1-5, a simplified structural diagram of which is shown in Fig. 8.

The memory device parameters of the signals of electronic means 11, 12, 13 are implemented using digital binary code registers based on RS or D-flip-flops.

Comparison unit 14 is a digital analogue of the comparator (used to compare voltages during operations with continuous signals), is a combinational logic device and is implemented on the basis of cascades of AND-OR-NOT logic elements.

The unit of accounting for the estimation error 15, the control device 16 can be implemented using a digital element base (programmable microprocessor).

Thus, the implementation of the proposed method is not in doubt, since the device for its implementation uses typical radio engineering devices and elements of digital technology.

The inventive method for detecting electronic devices is based on the use of spatial signal processing methods implemented by multichannel devices, which include multi-element speakers.

A device that implements the proposed method operates as follows

way.

As an example, consider a three-element antenna system, the elements of which are located at the vertices of an equilateral triangle inscribed in a circle of radius R, (figure 2).

At the output of each antenna element (AE), the voltages (responses) of the same input signal differ for identical AEs by phase shifts determined by the difference in the course of the electromagnetic wave to the AE.

The voltage of the i-th signal at the outputs of the antenna elements AC 1 have the following form:

$$\begin{array}{c}{U}_{i\mathrm{one}}\left(t\right)=U_{mi}\cos \left({\omega }_{i}t+{\varphi }_{i\mathrm{one}}\right)\\ U_{i2}\left(t\right)=U_{mi}\cos \left({\omega }_{i}t+{\varphi }_{i2}\right)\\ U_{i3}\left(t\right)=U_{mi}\cos \left({\omega }_{i}t+{\varphi }_{i3}\right)\end{array}\left(\mathrm{one}\right)$$

where φ _i1 is the phase shift of the i-th signal in the first antenna element relative to the center of the antenna system 1;

φ _i2 is the phase shift of the i-th signal in the second antenna element relative to the center of the antenna system 1;

φ _i3 - phase shift of the i-th signal in the third antenna element relative to the center of the antenna system 1,

that is, at the outputs of the antenna elements AC 1, the voltage (responses) of the i-th signal has phase shifts φ _i1 , φ _i2 , φ _i3 , the values of which are determined by the ratio of the radius of the circle of the antenna array R, the wavelength (frequency) of the signal λ, and also the direction of arrival electromagnetic waves, and are determined by the following formulas:

$$\begin{array}{l}{\varphi }_{i\mathrm{one}}=\left(2\pi R/\lambda \right)\cos \alpha \cos \epsilon \hfill \\ {\varphi }_{i2}=\left(2\pi R/\lambda \right)\cos \left(120°-\alpha \right)\cos \epsilon \hfill \\ {\varphi }_{i3}=\left(2\pi R/\lambda \right)\cos \left(240°-\alpha \right)\cos \epsilon \hfill \end{array}\left(2\right)$$

where α is the azimuth, ε is the elevation angle characterizing the direction of arrival of the signal.

To enable further processing of the signals from the AE outputs, they are amplified in the corresponding channels of amplifier 2 to the required level.

Extracting the information inherent in the incursion (shift) of the phase of the AE output voltages has certain difficulties due to the following factors. The output voltage of each AE is an additive mixture of signal, noise, and noise. Signals, noise and noise are described by statistical characteristics, and are estimated by averaged values, which are obtained by correlation processing. Therefore, the results of correlation processing of the output signals of multi-element speakers are conveniently presented in the form of a correlation matrix (CM) of signals. The correlation matrix of signals contains complete information about external sources acting on the speakers. The diagonal elements of the CM provide information on the power of intrinsic and external noise in the partial reception channels, the remaining elements of the CM contain information on wavelengths (frequencies) and on the directions of arrival of the signals, see, for example, Yampolsky V.G., Frolov O.P. Antennas and EMC. - M .: Radio and communications, 1983, p. 227, Monzingo R.A., Miller T.U. Adaptive Antenna Arrays: Introduction to Theory: Per. from English - M: Radio and communications 1986, p. 71-73, Wenskauskas K.K. Compensation for interference in marine radio systems. - L.: Shipbuilding, 1989, p.13, 14. Adaptive interference compensation in communication channels. Losev, A.G. Berdnikov, E.Sh. Goikhman, B.D. Sizov / under. ed. Yu.I. Loseva. - M.: Radio and Communications, 1988, p. 22-23.

For the convenience of extracting the information embedded in the phase shift (shift) of the signal, it is necessary to obtain a correlation matrix of signals at the output of AC 1, the diagonal elements of which are functions of autocorrelation, and the remaining elements are functions of cross-correlation of signals in the corresponding antenna elements.

To obtain KM elements, multiplication and low-pass filtering of the output voltage of each AE are performed with the output voltages of all other AEs in the KMS unit 3, the circuit of which is shown in Fig. 3. The correlators in the CCM block 3 are identical.

For the case under consideration, the correlation matrix of signals at the output of the KMS unit 3 in the presence of M signals of electronic equipment has the form:

$$F_{xx}^{\cdot }=\left[\begin{array}{ccc}{\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}+P_W}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(-j{\phi }_{i_{12}}\right)}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(-j{\phi }_{i_{13}}\right)}\\ {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(j{\phi }_{i_{21}}\right)}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}+P_W}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(-j{\phi }_{i_{23}}\right)}\\ {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(j{\phi }_{i_{31}}\right)}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}\exp \left(j{\phi }_{i_{32}}\right)}& {\displaystyle \sum _{i=\mathrm{one}}^M{P}_{C_i}+P_W}\end{array}\right]\left(3\right)$$

φ _i12 = φ _i1 -φ _i2 - phase incursion of the received signal in the first AE relative to the second;

φ _i13 = φ _i1 -φ _i3 - phase incursion of the received signal in the first AE relative to the third;

φ _i21 = φ _i2 -φ _i1 is the phase incursion of the received signal in the third AE relative to the second and so on.

The delay of the signals that are the elements of the CM is performed in the block of delay lines 6, and the number of delay lines is determined by the number of signals that make up the CM.

The delay time τ _s is selected from the conditions: the probability of a change in the number of signals acting on a multi-element antenna system during time t _{s by} more than one should be negligibly small, at the same time, the value of t _s should be no less than the duration of the transients during the formation of the output signals of the correlators.

The element-by-element subtraction of the signals of the current and delayed matrices and the presentation of the results of the subtraction in the form of a difference correlation matrix of signals is carried out in the subtractor 5 by subtracting from each signal that is an element of the current CCM of the form (3) the corresponding signal of the delayed CCM. Thus, at the output of the subtractor 5 in the considered example, there are nine difference signals that are elements of the difference CMC:

$$F_{XX\Delta }\left(t\right)=F_{XX}\left(t\right)-F_{XX}\left(t-{\tau }_s\right)\left(\mathrm{four}\right)$$

When performing a GMS subtraction operation, three outcomes are possible:

1. For a time equal to τ _{s the} number of signals acting on AC 1 has not changed, then the corresponding elements of the current and delayed CMC do not differ from each other, and therefore all elements of the differential CMC are equal to zero:

$$F_{xx\Delta }^{\cdot }=\left[\begin{array}{ccc}0& 0& 0\\ 0& 0& 0\\ 0& 0& 0\end{array}\right].\left(5\right)$$

2. During the time equal to τ _{s, the} number of signals acting on the AC 1 decreased by one (the k-th signal disappeared), then the differential CMR is a negative matrix and has the form:

$$F_{xx\Delta }^{\cdot }=F_{xxk}^{\cdot }=-\left[\begin{array}{ccc}{P}_{ck}& P_{ck}\exp \left(-j{\phi }_{k_{12}}\right)& P_{ck}\exp \left(-j{\phi }_{k_{13}}\right)\\ P_{ck}\exp \left(j{\phi }_{k_{21}}\right)& P_{ck}& P_{ck}\exp \left(-j{\phi }_{k_{23}}\right)\\ P_{ck}\exp \left(j{\phi }_{k_{31}}\right)& P_{ck}\exp \left(j{\phi }_{k_{32}}\right)& P_{ck}\end{array}\right].\left(6\right)$$

3. During time τ, the number of signals acting on the AC 1 increased by one (the l-th signal appeared), then the difference CMC is a positive matrix and has the form:

$$F_{xx\Delta }^{\cdot }=F_{xxl}^{\cdot }=\left[\begin{array}{ccc}{P}_{cl}& P_{cl}\exp \left(-j{\varphi }_{l_{12}}\right)& P_{cl}\exp \left(-j{\varphi }_{l_{13}}\right)\\ P_{cl}\exp \left(j{\varphi }_{l_{21}}\right)& P_{cl}& P_{cl}\exp \left(-j{\varphi }_{l_{23}}\right)\\ P_{cl}\exp \left(j{\varphi }_{l_{31}}\right)& P_{cl}\exp \left(j{\varphi }_{l_{32}}\right)& P_{cl}\end{array}\right].\left(7\right)$$

Since the value of the delay time τ _{s is} chosen with the condition that the probability of a change in the number of signals affecting the multi-element antenna system during time τ _{s by} more than one is negligible, the difference CMR is a correlation matrix of the signal that appears or disappears. In this case, the sign of the matrix allows you to determine: a signal appeared or disappeared, which is illustrated by the diagrams shown in Fig. 9 with reference to the signals U ₂ and U ₃ acting at different instants of time on AC 1. The signals that are elements of the differential CMR are fed to the frequency determination unit and spatial parameters of the signals 9 and the block determining the sign of the difference correlation matrix of the signal 8.

The determination of the working frequencies and directions of arrival (azimuths and elevation angles) of the electronic signals is carried out in the unit for determining the frequency and spatial parameters of the signals 9. The principles for determining the spatial and frequency parameters of radio signals are known and based on the reception of a signal by several antenna elements located at separated points in space, processing voltages induced in these antenna elements using various methods (amplitude, phase, amplitude-phase, Doppler Sky et al.) in order to extract information about spatial and frequency parameters, which is contained in the voltage phase difference in antenna elements, for example, Kukes I.S., Starik M.E. Basics of direction finding. - M .: "Sov. Radio", 1964, p.20-35.

In the claimed method, a phase method is used that implements the spatial signal processing algorithm: the voltages induced in each AE are correlated in the CCM unit 3, as a result of which signals (which are elements of the CMC) are formed. The phases of these signals contain information about the azimuth α, elevation angle ε, and wavelength λ (frequency), see expression (2). Differential CMC signals containing information about the azimuth, elevation angle and wavelength of the appeared or disappeared signal are sent to the unit for determining the frequency and spatial parameters of the signals 9.

The determination of the parameters of the signal α, ε, and λ that started or stopped the radiation in the block for determining the frequency and spatial parameters of the signals 9 (Fig.6) is as follows. The operation algorithm of the generator control unit 27 is set by the control unit 16 and, when determining the parameters of the signal that has started or stopped emitting, includes the following operations. For given (user-defined) search boundaries in the frequency range f _min , f _max ; azimuth α _min , α _max ; elevation angle ε _min , ε _max and corresponding resolution values in frequency, azimuth and elevation angle Δf; Δα; Δε, the generator control unit 27 controls the corresponding generators 21.1 ... 21.3, which form many variants of combinations of voltages proportional to the values of frequency (in MHz), azimuth, and elevation angle (in degrees), respectively. In the block for generating reference signals 22, signals from antenna elements AC 1 are simulated sequentially for current combinations of f values; α; ε and the vector of the reference signal at the output of the block forming the reference signals 22 (Fig.6) are as follows:

$$\begin{array}{c}{U}_{\mathrm{uh}\mathrm{one}}\left(t\right)=U_{m\mathrm{uh}}\cos \left({\omega }_{\mathrm{uh}}t+{\varphi }_{\mathrm{uh}\mathrm{one}}\right)\\ U_{\mathrm{uh}2}\left(t\right)=U_{m\mathrm{uh}}\cos \left({\omega }_{\mathrm{uh}}t+{\varphi }_{\mathrm{uh}2}\right)\\ U_{\mathrm{uh}3}\left(t\right)=U_{m\mathrm{uh}}\cos \left({\omega }_{\mathrm{uh}}t+{\varphi }_{\mathrm{uh}3}\right),\end{array}\left(8\right)$$

where φ _e1 is the phase shift of the reference signal corresponding to the phase shift of the voltage in the first AE relative to the center of the antenna system 1;

φ _e2 is the phase shift of the reference signal corresponding to the phase shift of the voltage in the second AE relative to the center of the antenna system 1;

φ _e3 is the phase shift of the reference signal corresponding to the phase shift of the voltage in the third AE relative to the center of the antenna system 1.

Thus, at the output of the unit for generating the reference signals 22, the voltages of the reference signal have phase shifts φ _e1 , φ _e2 , φ _e3 , the values of which are determined by the ratio of the radius of the circle of the antenna array R, the wavelength (frequency) of the reference signal λ _e , and the direction of arrival of the electromagnetic waves, and are determined by the expressions:

$$\begin{array}{l}{\varphi }_{\mathrm{uh}\mathrm{one}}=\left(2\pi R/{\lambda }_{\mathrm{uh}}\right)\cos {\alpha }_{\mathrm{uh}}\cos {\epsilon }_{\mathrm{uh}}\hfill \\ {\varphi }_{\mathrm{uh}2}=\left(2\pi R/{\lambda }_{\mathrm{uh}}\right)\cos \left(120°-{\alpha }_{\mathrm{uh}}\right)\cos {\epsilon }_{\mathrm{uh}}\hfill \\ {\varphi }_{\mathrm{uh}3}=\left(2\pi R/{\lambda }_{\mathrm{uh}}\right)\cos \left(240°-{\alpha }_{\mathrm{uh}}\right)\cos {\epsilon }_{\mathrm{uh}}\hfill \end{array}\left(9\right)$$

where α _e is the azimuth, ε _e is the elevation angle, the direction of arrival of the simulated reference signal.

; $$\overline{\alpha }$$

; $$\overline{\epsilon }$$

; соответствуют значениям параметрам сигналов, начавшим или прекратившим излучение.The correlation matrix block of the reference signal 23 and the subtractor 24 in the block for determining the frequency and spatial parameters of the signals 9 are identical to the block KMS3 and the subtractor 5 in FIG. 1 and perform the same functions. In the block for evaluating the difference 25, the accuracy of matching the correlation matrix of the signal that appears or disappears on the air and the correlation matrix of the generated copies (reference signals) is determined by a predetermined threshold value. In the unchanged electronic environment (there is no signal at the input of the unit for determining the frequency and spatial parameters of the signals 9), the voltage value of the output signal of the unit for estimating the difference 25 is 0. If the difference in the correlation matrices of the signals at the output of the subtractor 24 does not exceed the threshold value (i.e. e. the reference signal maximally coincided with the signal at the output of the subtractor 5 (Fig. 1) and whose parameters must be determined), then a high level signal appears at the output of the difference estimation unit 25 ( ogicheskaya unit). This signal reads from the block of registers 28 the values of the parameters f; α; ε in the form of codes of frequency, azimuth and elevation angle (as a result of analog-to-digital conversion in the “parameter-digital code” converter), which are output to the unit for determining the frequency and spatial parameters of signals 7. Thus, the values $$\overline{f}$$

; $$\overline{\alpha }$$

; $$\overline{\epsilon }$$

; correspond to the values of the parameters of the signals that started or stopped the radiation.

In the same way (by forming a set of reference signals and comparing each of them with the received multi-element AS signal by the correlation method), the spatial parameters of the signals in a low-base interferometer are determined, see Germany, patent DE 4128191 A1, 1993, IPC 7 G01S 3/46.

The polarity of the differential CMR is determined by the polarity of the signals that are the diagonal elements of the differential CMR at the output of the subtractor 5 and is measured with the aim of dividing the signals by belonging to the electronic means that stopped or started the radiation by the control device 16, which relates the signals to electronic means that stopped working if the polarity of the voltage pulse coming from the output of the block determining the sign of the differential KMS 8 is negative, and accordingly to the beginning of the wave appreciation if it is positive.

The values of the operating frequencies, the directions of arrival of the signals of the emitting electronic means are recorded in the form of a binary-decimal code (low and high level electrical pulses) in the corresponding memory devices 11 and 12, which are designed to store the parameters of the signals of the electronic means that respectively stopped and started the radiation.

The values of the operating frequencies and directions of arrival of newly appeared signals with the recorded values of the operating frequencies and directions of arrival of signals of electronic means that have stopped emitting are compared in block 14 by pulse-by-pulse comparison of code combinations of recorded signal parameters and code combinations of parameters of newly appeared signals contained in memory devices 11 and 12, taking into account the errors in estimating the parameters of the signals in the unit for accounting errors of estimation 15.

The separation of the emitting means that changed the operating frequency, according to the directions of arrival of the signals of these means, is carried out as follows: if, by an element-by-element comparison, the number of mismatches of the pulses does not exceed the threshold determined by the metering unit for the estimation error 15, then the control unit 16 decides to detect the signal of the electronic means that replaced operating frequency, otherwise the signal source is classified as new.

To enable detection of signals of constantly emitting electronic means in the inventive method, a mutual correlation matrix of signals is formed in the reciprocal CMC unit 4 by multiplying and low-pass filtering the output voltage of each AE described by expressions (1), (2) with the output voltages of the reference signal generating unit described expressions (8), (9).

Each element of the reciprocal CMC is a complex number, the real part of which is a product of amplitudes, the imaginary part is the product of the exponentials of the instantaneous voltage phases of the signals of electronic components and the reference. The product of the exponentials of the instantaneous phases reflects the cross-correlation of the signal of the electronic means and the reference signal. Therefore, if the received AC 1 signals are not correlated with the simulated reference signal, the values of the elements of the reciprocal CMC are zero, and if the parameters of the received AC 1 and the simulated reference signal are close, the values of the elements of the reciprocal CMC are non-zero and are proportional to the degree of coincidence of the frequency and spatial parameters.

For the case under consideration, a three-element speaker with the coincidence of the parameters of one of the M received speakers 1 with the parameters of the reference signal, the mutual correlation matrix of signals has the form:

$$\begin{array}{l}{F}_{x\mathrm{uh}}^{\cdot }=\\ \left[\begin{array}{ccc}{U}_{ci}\exp \left(j{\omega }_{i}t\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t\right)+P_W& U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i12}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}12}\right)& U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i13}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}13}\right)\\ U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i21}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}21}\right)& U_{ci}\exp \left(j{\omega }_{i}t\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t\right)+P_W& U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i23}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}23}\right)\\ U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i31}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}31}\right)& U_{ci}\exp \left(j{\omega }_{i}t-{\varphi }_{i32}\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t-{\varphi }_{\mathrm{uh}32}\right)& U_{ci}\exp \left(j{\omega }_{i}t\right)U_{\mathrm{uh}}\exp \left(j{\omega }_{\mathrm{uh}}t\right)+P_W\end{array}\right]\end{array}$$

Denoting the imaginary parts of the elements of the mutual CCM by coefficients with the corresponding indices, we obtain:

$$\begin{array}{l}{F}_{x\mathrm{uh}}=\left[\begin{array}{ccc}{U}_{ci}{U}_{\mathrm{uh}}{K}_{\mathrm{eleven}}+P_W& U_{ci}{U}_{\mathrm{uh}}{K}_{12}& U_{ci}{U}_{\mathrm{uh}}{K}_{13}\\ U_{ci}{U}_{\mathrm{uh}}{K}_{21}& U_{ci}{\mathrm{<figure-callout\; id="22"\; label="U\; uh\; K"\; filenames="00000022.png"\; state="\{\{state\}\}">U\; </figure-callout>}}_{\mathrm{uh}}{K}_{}{}_{22}+P_W& U_{ci}{U}_{\mathrm{uh}}{K}_{23}\\ U_{ci}{U}_{\mathrm{uh}}{K}_{31}& U_{ci}{U}_{\mathrm{uh}}{K}_{32}& U_{ci}{\mathrm{<figure-callout\; id="33"\; label="U\; uh\; K"\; filenames="00000024.png"\; state="\{\{state\}\}">U\; </figure-callout>}}_{\mathrm{uh}}{K}_{}{}_{33}+P_W\end{array}\right]=\\ U_{ci}{U}_{\mathrm{uh}}\left[\begin{array}{ccc}{K}_{\mathrm{eleven}}+\frac{P_W}{U_{ci}{U}_{\mathrm{uh}}}& K_{12}& K_{13}\\ K_{21}& {\mathrm{<figure-callout\; id="22"\; label="K"\; filenames="00000022.png"\; state="\{\{state\}\}">K</figure-callout>}}_{22}+\frac{P_W}{U_{ci}{U}_{\mathrm{uh}}}& K_{23}\\ K_{31}& K_{32}& {\mathrm{<figure-callout\; id="33"\; label="K"\; filenames="00000024.png"\; state="\{\{state\}\}">K</figure-callout>}}_{33}+\frac{P_W}{U_{ci}{U}_{\mathrm{uh}}}\end{array}\right]\left(10\right)\end{array}$$

The maximum values of the coefficients K are achieved with a complete coincidence of the frequency and spatial parameters.

Thus, the values of the elements of the mutual CMC reflect the proximity of the frequency and spatial parameters (f; α; ε) of the signals of the radio electronic means and the reference.

To ensure maximum accuracy and convenience in determining the moment of complete coincidence of the frequency and spatial parameters of the received AC 1 and the simulated reference signal in the inventive method, the corresponding operations of multiplication, addition and subtraction with signals of the corresponding elements of the mutual correlation matrix of signals are performed in the block of the determinant of the mutual correlation matrix of signals, in the result of which is the determinant Δ of the mutual correlation matrix of signals, which for the considered tea three-piece speaker is calculated according to the following rule:

$$\Delta =U_{ci}{U}_{\mathrm{uh}}\left(a_{\mathrm{eleven}}{a}_{22}{a}_{33}+a_{21}{a}_{32}{a}_{13}+a_{12}{a}_{23}{a}_{31}-a_{13}{a}_{22}{a}_{31}-a_{23}{a}_{32}{a}_{\mathrm{eleven}}-a_{12}{a}_{21}{a}_{33}\right),\left(\mathrm{eleven}\right)$$

see, for example, Bronstein I.N., Semendyaev K.A. Handbook of mathematics for engineers and university students - M .: Nauka, 1986, p. 158. At the maximum values of the elements of the reciprocal CMC, the determinant of the reciprocal CMC also has the greatest value.

To determine the moment of complete coincidence of the frequency and spatial parameters of the received AS 1 and the simulated reference signal, in the claimed method, in the block for calculating the maximum of the mutual determinant of the CMC 10, find the maximum value of the determinant of the mutual correlation matrix of signals. This is done as follows.

To find the maximum determinant of the mutual CCM when evaluating the parameters of constantly emitting electronic means, the control unit 16 sets the following algorithm of the control unit of the generators 27.

For given (user-defined) search boundaries in the Frequency Range f _min , f _max ; azimuth α _min , α _max ; elevation angle ε _min , ε _max and corresponding resolution values in frequency, azimuth and elevation angle Δf; Δα; Δε, the generator control unit 27 sequentially controls the corresponding generators 21.1 ... 21.3, forming a variety of combinations of voltages proportional to the values of frequency (in MHz), azimuth, and elevation angle (in degrees), respectively, providing a maximum search first by one parameter (for example, by frequency ), then along the second (azimuth) and then along the third (elevation). To implement the search procedure for the maximum of the determinant, various algorithms can be implemented. For example, gradient algorithms described in Monzingo R.A., Miller T.U. Adaptive Antenna Arrays: An Introduction to Theory. - M .: Radio and communications, 1986. p.128-176, random search algorithms, ibid. P. 319-330, as well as Widrow B., Stirnz S. Adaptive signal processing: Trans. from English - M.: Radio and Communications, 1989, p. 152-155.

The voltage from the output of the determinant block of the mutual KMS 7 is supplied to the input of the analog-to-digital converter 33, Fig. 8. The voltage level codes (KUs) generated in it are simultaneously supplied to the inputs of the level 32 code register and the comparison unit 34. Each time the KU signal is received, it is compared with the KUs recorded earlier in the level 32 code register. If the new KUs are larger than the recorded ones, then this the code is written into the code register of level 32. In this case, a control voltage is generated in the block for determining the frequency and time parameters of the signals 9 to record the set of values of f; α; ε to the block of registers 28. Thus, in the register of the code of level 32, information on the signal level is updated to determine its maximum value during the search for the maximum, and combinations of f values are stored in the block of registers 28; α; ε corresponding to the maximum of the determinant of mutual CMC. The reading of these values from the block of registers 28 in the memory of the constantly emitting electronic means 13 is carried out by the control signal of the control unit 16 after the maximum is uniquely set. Simultaneously with reading the values of the parameters, the block of registers 28 and the register of the code of level 32 are reset.

Let us explain the dynamics of the device that implements the inventive method. Monitoring changes in the electronic environment is carried out from time t ₀ .

The mutual CCM unit 4 generates signals corresponding to the elements of the mutual correlation matrix of the input signals and the reference signal for current combinations of f values; α; ε. When these values approach the values corresponding to the parameters of one of the signals acting on the speakers, for example U _c1 , the voltage U _BO increases at the output of the recipient of the reciprocal CMC 7. At the moment when it reaches its maximum value, the unit for determining the maximum of the recipient of the reciprocal CMC 10 generates a signal U _BOM to the control device 16 about the presence of radiating electronic means and to the unit for determining the frequency and spatial parameters of the signals 8 for recording in the block of registers 28 combinations of f values; α; ε corresponding to the maximum of the determinant and, therefore, the signal parameters U _c1 . If within the predetermined time period τ _backside avionics means does not cease operation control unit 16 at time t ₁ forms a U _UU command unit determining the frequency and spatial parameters of signals 9 for the determination of wavelength λ _i (frequency f _i), the azimuth α _i , the elevation angle ε _{i of the} signal of this electronic means and these parameters are provided to the information inputs of the storage devices 11, 12 and 13, also for recording these values in the storage device of the constantly emitting electronic means 13.

Let at time t ₂ , the number of signals at the input of the antenna system 1 increased by one. In this case, the correlation matrix of signals at the output of the CCM unit 3 has changed, and due to the delay of its previous form in the block of delay lines 6, the differential CMC at the output of the subtractor 5 (which is zero until time t ₂ ) becomes non-zero and positive. In the block for determining the frequency and time parameters of signals 9, the wavelength λ _i , (frequency f _i ), azimuth α _i , elevation angle ε _{i of the} signal of the given electronic means are determined and these parameters are provided to the information inputs of the storage devices 11 and 12. The signal from the output of the block determining the sign of the differential KMS 8 (in this case, a positive level) is sent to the control device 16, which in this case sends a command to the control input of the storage device 12, by which the signal parameters of this electronic first means in one of the memory cells of the memory device 12. Next, the control unit 16 initiates the operation of comparing the azimuth and elevation angle of the signal with electronic means azimuths and elevation angles of signals stored in the memory 11 of signal parameters, work ceased. To this end, the azimuth value α _i and elevation angle ε _{i are} supplied to the second input of the comparison unit 14 from the output of the storage device 12, and information on azimuths and elevation angles of all signals stored in the storage device 11 is sequentially read to its first input. Results of comparing azimuths and elevation angles enter the unit of estimation error estimation 15 (in which the boundaries of the confidence intervals Δα and Δε are set). If the modulus of the difference in azimuth of the appeared signal and the azimuths of the signals stored in the memory 12 exceeds Δα for all combinations of azimuths or the module of the difference in the elevation angle of the appeared signal and the elevation angles stored in the memory 11 for all combinations of elevation exceeds Δε, then the detected signal does not It belongs to a radio-electronic device, which has previously changed the operating frequency, and is a signal of a radio-electronic means, which aired for the first time. After the appearance of the signal U _c2 with signals generated by the block of mutual CCM 4, for the current combinations of f values; α; ε in the case of approaching these values to the values of the corresponding parameters of the signal U _c2 voltage U _BO at the output of the block determinant mutual CMC 7 increases. At the moment when it reaches its maximum value, the unit determining the maximum of the mutual CMC determinant 10 generates a _UBOM signal U to the control device 16 about the presence of radiating electronic equipment, and to the unit for determining the frequency and spatial parameters of the signals 9 for writing to the register block 28 combinations of f values ; α; ε corresponding to the maximum of the determinant and, therefore, the signal parameters U _c2 . If the duration of the radiation of the signal is less than the specified interval τ _ass , then the recording of these values in the storage device of the constantly emitting electronic means 13 is not performed.

Let at time t _{3 the} number of signals at the input of the antenna system 1 decreased by one. In this case, the differential CMC at the output of the subtractor 5 (which is zero until the time t ₃ that is, until the number of signals acting on the antenna system 1 has not changed) becomes non-zero and negative. Next, by analogy with the above, the calculation and recording of the parameters of the signal of the electronic means that stopped the radiation (λ _j , α _j and ε _j ) in the storage device 11. The appearance of the signal (in this case, a negative level) at the output of the unit for determining the sign of the correlation matrix 6 It is the signal for azimuth control device 16 comparing to initiate operation α _j, elevation angle ε _j and frequency f _j disappeared signal with the signal parameters stored in the memory 12 carried out by a method analogous to Chez described. The results of the comparison and accounting of the estimation error are sent to the control device 16, after which it cleans the cell of the storage device 12, in which data was stored on the disappeared signal of the electronic means.

Suppose that at time t _{4 the} number of signals at the input of the antenna system 1 increased by one. If, after conducting operations similar to those described above, by comparing the azimuths α _q and elevation angles ε _q , it turns out that the moduli of their differences δα _q and δε _q do not exceed the specified confidence intervals Δα and Δε, then the detected signal belongs to a radio electronic device that has previously changed the operating frequency and then the control device 12 cleans the corresponding cell of the storage device 11, in which the values of the azimuth, elevation angle and previous operating frequency of this electronic means were stored.

After the appearance of the signal U _c3 with the signals generated by the mutual CCM block 4 for the current combinations of f values; α; ε in the case of approaching these values to the values of the corresponding parameters of the signal U _c3 voltage U _BO at the output of the block determinant mutual CMC 7 increases. At the moment when it reaches its maximum value, the unit determining the maximum of the mutual CMC determinant 10 generates a _UBOM signal U to the control device 16 about the presence of radiating electronic equipment, and to the unit for determining the frequency and spatial parameters of the signals 9 for writing to the register block 28 combinations of f values ; α; ε corresponding to the maximum of the determinant and, therefore, the signal parameters U _c3 . If the duration of the signal emission is greater than the specified interval τ _back , then at time t _5, at the command of the control device 16, these values are recorded in the memory of the constantly emitting electronic means 13. In this case, the control device 16 initiates operations of comparing the azimuth α _q , elevation angle ε _q and frequency f _q U _c3 signal with the signal parameters stored in a memory 12. The comparison results and taking into account estimation error sent to the control device 16, whereupon it produces spare cell purification minal device 12.

The inventive method provides the expansion of the functionality of the prototype due to the automatic solution of the problems of radio reconnaissance associated with the detection of continuously working electronic means.

The proposed method for detecting electronic equipment is universal and can be implemented both in the radio jamming technique of radio communication and in radio monitoring tools, it provides a significant reduction in time spent on the detection of continuously working electronic equipment in comparison with analogues due to the implementation of searchless detection of signals and direction finding of their sources and increases Efficiency of jamming radio electronic means assigned to radio suppression.

Claims (1)

A method for detecting electronic means, which consists in receiving signals with a multi-element antenna system, amplifying, multiplying and low-pass filtering the output voltage of each antenna element with the output voltages of all antenna elements and presenting the results of multiplication and filtering in the form of a correlation matrix of signals, delaying these signals by a delay time τ _h, the value of which provides the conditions that the probability of changing the number of affecting multiple antennas ICU him during τ _of signals more than one is negligibly small, element by element subtraction of signals from the current and delayed matrices signals and presentation of the subtraction results as difference signal correlation matrix, which is a nonzero matrix in the case of changing the number of the emitting electronic means for a time period equal to τ _s, and represents the correlation matrix appeared or disappeared signal for determining its operating frequency and values of direction of arrival of electronic signal Supplementary Accessories VA, which stopped or started radiation during this period of time using sequentially generated reference signals corresponding to the design of the antenna system, with all possible combinations of frequencies, azimuths and elevation angles in a given range that differ from each other by resolution values for these parameters, measuring the difference polarity the correlation matrix of the signal and determining by its value that the signal belongs to electronic means that have stopped or started radiation, recording working values frequency, direction of arrival of the signal separately for the signal of the electronic means that stopped the radiation, and the signal of the electronic means that started the radiation, comparing the values of the working frequency and the direction of arrival of the signal of the newly appeared radiation with all recorded values of the operating frequencies and directions of arrival of the signals of the electronic means that stopped the radiation, and determining a radiating electronic means that has changed the operating frequency, based on the direction of arrival of the signal of this radioelectric tron means, characterized in that they further multiply and low-pass filter the output voltage of each antenna element with the voltages of the reference signal corresponding to all antenna elements, and present the results of multiplication and filtering in the form of a mutual correlation matrix of signals, perform the corresponding operations of multiplication, addition and subtraction with signals of the corresponding elements of the mutual correlation matrix of signals, resulting in a determinant of mutual hydrochloric correlation signal matrix find the maximum value of the cross correlation matrix of the determinant signal and the maximum value of the cross correlation matrix of the determinant signal by a reference signal parameters determined by the frequency and the direction of arrival of a signal continuously emitting electronic means.

Images