RU2716702C1 - Method for radio suppression of communication channels - Google Patents

Abstract

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering, namely to engineering of creation of artificial radio interference, and can be used for radio suppression of radiation sources, a priori information on operating frequency of which is not known, including using mode with pseudo-random tuning of operating frequency. Disclosed is a method of radio suppression of communication channels, in which presence of external radio radiations within each of N subbands is checked. And the interference signal is sequentially emitted only on those M≤N subbands, starting from the first, on which operation of external radio radiations is not detected. Duration of emission of the interference signal t_i is selected such that for the minimum value of time t_min, the interference signal is emitted on each of the M subbands, on which no operation of external radio waves is detected.

EFFECT: technical result is increase of time interval of coincidence of noise signal and suppressed signal.

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Description

The invention relates to the field of radio engineering, and in particular to the technique of creating artificial radio interference, and can be used for radio suppression (RP) of radiation sources (AI), a priori information about the load of operating frequencies of which is not known, including those using the pseudo-random tuning of the operating frequency ( HRHF).

The known method of communication channels RP according to the patent of the Russian Federation No. 2104616 C1 of 02/10/98, IPC Н04К 3/00, publ. 02/10/98, bull. Number 4.

The known method includes receiving signals of the AI, determining their parameters, measuring the total time during which there is no reception of signals at the operating frequencies of the AI in a given period of time, the distribution of the time resource RP between the operating frequencies of the AI, subject to RP. The formation of the structure of control signals that specify the operation mode of the transmission control device and the structure of modulating voltages, modulation of the pathogen signals, their amplification in the interference transmitter and broadcasting in the mode specified by the signal of the transmission control device according to the time resource of the RP during an interval equal to the absence time suppressed frequency.

The disadvantage of this method is that it has a limited scope, since it allows you to effectively implement RP only those radio communication systems that use a fairly limited number of operating frequencies for data transmission and information on the degree of their congestion is completely a priori known.

A known method of RP communication channels, see RF patent No. 2450458 by application No. 20111114687 from 11.24.2011.

In the known method, receive the signals of the AI, determine their parameters, form the control signals of the transmission mode and structure of the modulating voltages, modulate, amplify and emit interference signals, receive the signals of the AI in the frequency band ΔF during the time cycle T _p at each operating frequency of the AI ƒ _i , where i = 1, 2, ... is the current number of the operating frequency of the AI. The received signal measures the time t _i during which it exists at the ith frequency, from the number of measured time intervals t _i , the minimum value t _{min is} extracted, and the interfering signal is emitted in the time interval t _p = t _min during the time cycle T _p starting from the end of the time cycle T _p , each time a source signal is detected at one of its operating frequencies ƒ _{i, the} End of the time cycle T _{p is} selected from the condition of three-fold coincidence of the smallest of the values t _{i of the} detected signals at the operating frequencies И _i AI. The time cycle T _{p is} considered complete if, after the next radiation of the interfering signal t _p at all frequencies ƒ _{i, there is} no signal from the AI. The generation of control signals for the transmission mode includes the selection of the carrier frequencies of the interfering signals that match the operating frequencies of the received signals of the AI packet communication channels, the formation of control signals for the emission time of the interfering signals t _p at frequencies ƒ _i within the time cycle of the RP and the control signal of the interference radiation at the beginning and end RP cycle. As the determined parameters of the signal to be RP, choose its carrier frequency, the width of the spectrum and the type of modulation.

The disadvantage of this method is that it has a limited scope, because provides effective RP communication channels only if during the time cycle T _p will be revealed all the values of the operating frequencies of AI ƒ _i .

Closest in technical essence to the claimed is the method of RP communication channels, see RF patent No. 2638940 on the application of 12/26/2016, published on 12/19/2017 in bull. Number 35.

In the prototype method, receive the AI signals in the frequency band ΔF during the time cycle T _p and at each operating frequency of the AI ƒ _i , where i = 1, 2, ... is the current number of the operating frequency of the AI, measure the time t _i during which the signal exists at the i-th frequency, from the number of measured time intervals t _i isolate the minimum value t _min , generate control signals for the transmission mode and the structure of the modulating voltages, modulate, amplify and emit interference signals during the time cycle T _p starting from the end of the time cycle T _r And the frequency band ΔF is divided into N subbands of equal length Δƒ _p , and the interfering signal is sequentially emitted on each of the n-th subband, where n = 1, 2, ... N, starting from the first, while the duration of the radiation of the interfering signal t _{p is} chosen as so that for a minimum value of time t _{min the} interfering signal is emitted on each n-th subband.

The disadvantage of the prototype method is that when jamming, the limited energy resource of the noise source is inefficiently used, since the RP is carried out in the entire frequency band of the operation of AI signals with frequency hopping, without taking into account the real load of the frequency range. The result is the minimum possible time interval for the coincidence of interference and the suppressed signal.

The aim of this invention is to develop a method of RP communication channels, which will provide an increase in the effectiveness of the RP of the frequency hopping signals by increasing the time interval between the interference and the suppressed signal.

The technical result is to increase the time interval for the coincidence of the interference signal and the suppressed signal.

The technical result and the goal are achieved by the fact that the method of radio suppression of communication channels, which consists in receiving signals from radiation sources in the frequency band ΔF during the time cycle T _p and at each operating frequency of the radiation source ƒ _i , where i = 1, 2, ... - the current number of the operating frequency of the radiation source, measure the time t _i during which the signal exists at the i-th frequency, from the number of measured time intervals t _i allocate the minimum value t _min , the frequency band ΔF is divided into N subbands of equal length Δƒ _p , generate control signals for the transmission mode and the structure of the modulating voltages, modulate, amplify and emit interfering signals during the time cycle T _p , starting from the end of the time cycle T _p , sequentially within each of the subbands, starting from the first, so that for the minimum value of time t _{min the} interfering signal was emitted on each of the subbands, characterized in that they check for the presence of third-party radio emissions within each of the N subbands, and the interfering signal is sequentially emitted only on those M≤N subbands, starting from the first, on which the operation of third-party radio emissions is not detected, while the duration of the emission of the interfering signal t _{p is} chosen so that for the minimum value of time t _{min the} interfering signal is emitted on each of the M subbands on which the operation of third-party radio emissions is not detected .

Thanks to the new set of essential features in the claimed method, it is possible to increase the effectiveness of the RP of the frequency hopping signals by increasing the time interval of the coincidence of the interference signal and the suppressed signal.

The claimed method is illustrated by drawings, which show:

FIG. 1 spectrum A (ƒ) and the time-frequency panorama explaining the principle of the prototype method when implementing the time cycle T _p in the frequency band ΔF of the operation of the AI in the mode with frequency hopping;

FIG. 2 spectrum A (ƒ) and time-frequency panorama, explaining the principle of implementation of the proposed method when implementing a time cycle T _p in the frequency band ΔF of the operation of the AI in the mode with frequency hopping.

The possibility of implementing the proposed technical solution for RP communication channels, including those using a mode with frequency hopping, is explained as follows.

It is known that in the frequency hopping mode, the AI signal is sequentially tuned from one operating frequency to another according to a pseudo-random law. At the same time, the signal emission time at each operating frequency remains unchanged (see Borisov V.I. et al. Interference immunity of radio communication systems with the expansion of the signal spectrum by the pseudo-random tuning of the working frequency. - M. Radio and communications. 2000 - 384 p. - section 1.1 .2, p. 19-24.).

For the RP of such communication channels in accordance with the known prototype method (see RF patent No. 2638940 for application No. 2016151522 dated December 26, 2016), the interfering signal during the time cycle T _{p is} emitted sequentially on each of N subbands within the frequency band ΔF . The principle of RP is shown in FIG. 1.

In this case, the duration of the emission of the interfering signal t _p1 (see Fig. 1) is chosen so that for the minimum value of time t _{min the} interfering signal is emitted on each of the N subbands.

The disadvantage of the considered method is that its implementation provides the minimum possible time interval for the coincidence of the interfering signal and the suppressed signal, since the method does not take into account the real load of the frequency range in which the AI with frequency hopping operates.

As an example in FIG. 1 shows a fragment of the spectrum and the time-frequency panorama at the stage of the RP signals of the AI with frequency hopping. At the same time, in accordance with the implementation of the prototype method, the principle of sequentially setting interference signals in the frequency band ΔF in each of N subbands of equal length Δƒ _{p is} shown _. As a result, the duration of the time interval between the interference signal and the suppressed signal t _p will be t _p = t _min / (ΔF / Δƒ _p ). For the example of FIG. 1, t _p1 = t _min / 7.

In FIG. 1 in the frequency band ΔF shows the operation of three AI. Two powerful broadband AIs operating in the frequency band Δƒ ₁₂ = ƒ ₂ -ƒ ₁ and ƒ ₃₄ = ƒ ₄ -ƒ ₃ , and one narrow-band AI operating at a frequency of ƒ ₅ .

Obviously, with a random selection of the operating frequencies of the frequency hopping signals in the bands Δƒ ₁₂ and Δƒ ₃₄ , communication will not be provided, due to the low signal-to-noise ratio (SNR) in the channel. Therefore, the purpose of the interference signals in the bands Δƒ ₁₂ and Δƒ _{34 is} impractical.

In the inventive method, see FIG. 2, in the bands Δƒ ₁₂ and Δƒ ₃₄ , an interference signal is not assigned. As a result, the duration of the time interval between the interference signal and the suppressed signal t _p will be t _p = t _min / ([ΔF-Δƒ ₁₂ -Δƒ ₃₄ ] / Δƒ _p ). For the example of FIG. 2, t _p2 = t _min / 4.

Thus, the exclusion of the bands Δƒ ₁₂ and Δƒ ₃₄ from the frequency range of the assignment of the interference signal will lead to the achievement of the technical result of the proposed method, namely, to increase the time interval of the coincidence of the interference signal and the suppressed signal. And as a result - to increase the effectiveness of RP, i.e. achieving the objective of the invention.

см. фиг. 1 и фиг. 2. В общем случае в заявляемом техническом решении значение t_п всегда будет не меньше, чем в способе прототипе, т.е. t_п2≥t_п1.Indeed, for this example _n2 t> t _pl, because

see FIG. 1 and FIG. 2. In the General case, in the claimed technical solution, the value of t _p will always be no less than in the prototype method, ie t _{n1 n2} ≥t.

Implement the inventive method is possible as a result of the following sequence of actions (technical operations).

1. At the initial stage, the AI signal is received during the time cycle T _p in the frequency band ΔF at each operating frequency of the AI ƒ _i , where i = 1, 2, ... is the current number of the operating frequency of the AI, time t _{i is} measured, during which the signal exists at the i-th frequency, from the number of measured time intervals t _i allocate the minimum value t _min .

These technical procedures are known and described, for example, in the prototype method (see RF patent No. 2638940 for application No. 2016151522 dated 12/26/2016).

As an example, in FIG. Figure 2 shows the time-frequency panorama of the frequency band ΔF, in which the AI operation is fixed at 7 operating frequencies within the bands Δƒ ₁ , Δƒ ₂ , Δƒ ₃ , Δƒ ₄ , Δƒ ₅ , Δƒ ₆ , Δƒ ₇ . It also shows the time interval of the value of t _min , the time interval of time T _p , the frequency band ΔF, within which the AI signals with frequency hopping.

2. At the end of the time cycle T _p begin the time cycle T _p . The time cycle T _p ends or after a predetermined time, for example, determined by the cycle of operation of interference stations: target distribution; suppression; assessment of the current effectiveness of RP; adjustment of the target distribution based on the results of evaluating current effectiveness, taking into account the discovery of new AI (see page 331 Osipov A.S. Military-technical training. Military-technical fundamentals of building tools and complexes of electronic warfare: textbook / A.S. Osipov; ed. E.N. Garina. - Krasnoyarsk: Sib. Federal University, 2013. - 344 p.), Or after the condition of threefold coincidence of the smallest of the values of t _i detected signals at operating frequencies ƒ _i AI (see RF patent No. 2450458 by application No. 20111114687 of 11.24.2011).

3. Break the frequency band ΔF into N subbands of equal length Δƒ _p .

4. Then check the availability of work of third-party AI within each of the N subbands, from which M subbands are selected, on which the work of third-party AI is not detected.

In the general case, N≥M.

The procedures for selecting M subbands that do not reveal the operation of third-party AI can, for example, be carried out by measuring the noise and interference levels in each of the N subbands and then comparing them with acceptable values.

As an example in FIG. 2 shows the time-frequency panorama, which explains the preliminary selection of 7 subbands Δƒ ₁ , Δƒ ₂ , Δƒ ₃ , Δƒ ₄ , Δƒ ₅ , Δƒ ₆ , Δƒ ₇ within the band ΔF, of which in the subbands Δƒ ₂ , Δƒ ₃ and Δƒ _{7, the} work of third-party AIs is ongoing, so the indicated frequencies are not included in the list of M subbands. At a frequency of ƒ ₅ in the subband Δƒ ₄ , the operation of a narrow-band AI is shown, which does not exceed the permissible value of the noise level in the subband Δƒ ₄ .

The implementation of the measurement procedures is known, see, for example, RF Patent No. 2613035, by application No. 2016109542 dated March 16, 2016, published March 14, 2017, Bull. No. 8 and the patent of the Russian Federation No. 2420760, published on 02.27.2010, Bull. No. 6, by application 2009143758/09, dated November 26, 2009

5. Select the duration of the emission of the interfering signal t _p so that for the minimum value of time t _{min the} interfering signal is emitted on each of the M subbands.

As an example in FIG. 2 shows the choice of the interval of the duration of the radiation of the interfering signal t _p (in Fig. 2 it is indicated as t _p2 ).

6. Then, control signals are generated for the transmission mode and the structure of the modulating voltages, modulated, amplified and emitted interfering signals during the time cycle T _p starting from the end of the time cycle T _p .

The operations for generating control signals for the transmission mode, including selecting the carrier frequencies of the interfering signals, generating control signals for the emission time of the interfering signals t _p sequentially on subbands of equal length ƒ _p within the frequency band ΔF and the control signal for the interference radiation at the beginning and end of the suppression cycle are known and described for example, in (RF patent No. 2104616 C1 of 02/10/98, IPC Н04К 3/00, publ. 02/10/98, bullse, No. 4, as well as in RF patent No. 2638940 by application No. 2016151522 of December 26, 2016).

7. An interfering signal is emitted sequentially on each of the M subbands, starting from the first. By first, we mean the first subband (the smallest by the value of the nominal center frequency within the subband) from array M.

The considered actions are known and described in different interpretations in available sources, for example, in (RF patent No. 2638940 according to application No. 2016151522 dated 12/26/2016, as well as Osipov A.S. Military-technical training. Military-technical foundations for the construction of electronic warheads and complexes : textbook / A.S. Osipov; under the scientific editorship of E.N. Garin. - Krasnoyarsk: Siberian Federal University, 2013.- 344 p.).

In FIG. Figure 2 shows the time cycle interval T _p , where sequential radiation of the interference signal of duration t _p2 = t _min / 4 is carried out on M subbands, i.e. M = 4, in the frequency bands Δƒ ₁ , Δƒ ₄ , Δƒ ₅ , Δƒ ₆ . Shown here are AI signals with frequency hopping, operating at a frequency of ƒ ₁₁ in the band Δƒ ₁ , at a frequency of ƒ ₁₂ and a frequency of ƒ ₁₃ in the band Δƒ ₅ , at a frequency of ƒ _{] 4} and at a frequency of ƒ ₁₅ in the band Δƒ ₆ from the list of operating frequencies ƒ _i .

In the indicated frequency subbands, interference signals are emitted in the corresponding sequence for equal time intervals t _p2 = t _min / 4, i.e. M = 4 of the possible N = 7 subbands.

At the same time, according to the prototype method, see FIG. 1, the emission time of the interfering signals t _p1 = t _min / 7. Therefore, in relation to the considered example, provides an increase in the effectiveness of RP, which in terms of t _p will be t _p2 / t _p1 = t _min / 4 / t _min / 7 = 7/4. In the worst case for the RP system, when N = M, the RP effectiveness in terms of t _p will be 1.

The duration of the cycle T _p is determined by the algorithm of the means of jamming, see Osipov A.S. Military-technical training. Military-technical foundations of building tools and complexes of electronic warfare: textbook / A.S. Osipov; under the scientific. ed. E.N. Garina. - Krasnoyarsk: Sib. Feder. Univ., 2013 .-- 344 p.

In FIG. 2 time cycle T _p terminated after the RP of the radio line at a frequency of ƒ ₁₅ .

The operation of generating control signals of the transmission mode, including the selection of the carrier frequencies of the interfering signals that match the operating frequencies of the received signals of the AI packet communication channels, the generation of control signals for the emission time of the interfering signals t _p at frequencies ƒ _i within the time cycle of the RP and the control signal of the interference radiation in the beginning and end of the RP cycle are known and described, for example, in (RF patent No. 2104616 C1 of 02/10/98, IPC Н04К 3/00, publ. 02/10/98, bull., No. 4).

Thus, thanks to a new set of essential features in the claimed method, it is possible to increase the efficiency of the RP of the frequency hopping signals by increasing the time interval of the coincidence of the interference signal and the suppressed signal.

Claims (1)

The method of radio suppression of communication channels, which consists in the fact that the signals of the radiation sources in the frequency band ΔF are received during the time cycle T _p and at each operating frequency of the radiation source ƒ _i , where i = 1, 2, ... the current number of the operating frequency of the radiation source is measured time t _i during which the signal exists at the ith frequency, the minimum value t _{min is} allocated from the number of measured time intervals t _i , the frequency band ΔF is divided into N subbands of equal length Δƒ _p , control signals of the transmission mode and structure m are formed modulating voltages, modulate, amplify and emit interfering signals during the time cycle T _p , starting from the end of the time cycle T _p , sequentially within each of the subbands, starting from the first, so that for a minimum value of time t _{min the} interfering signal is emitted on each of the subbands, characterized in that the presence of external radio emissions within each of the N subbands is checked, and the interference signal is sequentially emitted only on those M≤N subbands, starting from the first, on which operation with Oron radio signals, wherein the duration of the noise signal _n t radiation is selected so that the minimum value t _min time interference signal was emitted at each of M subbands that are not revealed outside the work radio emissions.

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