RU2540108C2 - Method for electronic jamming of radio communication system - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering and can be used to jam shipborne and airborne radio communication equipment. The method for electronic jamming of a radio communication system is based on receiving a probing information signal a jammed system, reproducing the carrier frequency of the signal, generating an interfering signal, amplifying and emitting the signal towards the jammed equipment. The method includes continuously measuring coordinates of carriers of the transmitter and receiver of the jammed system; the carrier of the jamming system used is an aircraft, wherein said carrier is held at a point in space on the "transmitter - receiver" line with the shortest possible distance from the receiver; upon detecting, in the received probing information signal of the transmitter, information radio pulses of a phase-shift keyed signal with carrier frequency which abruptly varies from pulse to pulse according to a random law, the duration, repetition period and carrier frequencies of said pulses are measured; if the measurement results match catalogue values of parameters of the probing information signal of the jammed system, interfering signals are generated, which are radio pulses with the same duration, repetition period and carrier frequency as the received probing information pulses, but delayed by about 0.2 mcs relative to the received pulses and without phase-shift keying, wherein each of the interference pulses are generated in form of a non-modulated radio pulse of the same duration as the received probing information radio pulses.

EFFECT: high efficiency of electronic jamming.

1 dwg

Description

The invention relates to radio engineering, and in particular to electronic suppression (REP) by active interference of radio electronic means (RES), in particular radio communications with pseudo-random tuning of the operating frequency, and can be used to suppress ship and aircraft radio communications.

The known method of REP RES active interference, implemented in the station of active interference, protected by RF patent for the invention №2103705 IPC G01S 7/38, 1994, in the station of masking and impulse noise, protected by RF patent for utility model №29818 IPC H04K 3/00 , G01S 7/38, 2002 and in the jamming device protected by the RF patent for utility model No. 29198, IPC Н04К 3/00, G01S 7/38, 2002. In accordance with this method, a sounding information signal is received, according to it reproduce its carrier frequency, form a response noise interference at this frequency, amplify the radiation point towards the suppressed RES.

The reception of a sounding information signal, reproduction of its carrier frequency, the formation of an interfering signal, its amplification and radiation in the direction of the suppressed RES are essential features of the proposed method.

The reason that impedes the achievement of the technical result provided by the invention in these analogs is the relatively narrow frequency range of suppression of RES. The extension of the frequency range of suppressing the RES makes the required energy potential of the jamming station so large that the method becomes either not feasible, or the suppression itself is ineffective.

The closest in technical essence to the proposed method of REP (prototype) is a method that implements polyharmonic interference [see, for example, Borisov V.I. and others. Interference immunity of radio communication systems with the expansion of the spectrum of signals by the method of pseudo-random tuning of the operating frequency. - M .: Radio and communication. - 2000. - p. 53-59, Fig. 1.23, 1.24]. In accordance with this method, as in the above counterparts, a sensing information signal is received, a carrier frequency is reproduced along it and a response interference is generated, amplified and radiated in the direction of the suppressed RES. However, the interference is not a noise signal in a wide range, but a set of unmodulated harmonic oscillations of equal power distributed over the operating frequency range of the suppressed RES and simultaneously emitted in its direction.

The reception of a sounding information signal, the formation of response interference from it, which is a set of harmonic unmodulated oscillations, their amplification and radiation in the direction of the suppressed RES are essential features of the proposed method.

The described prototype method is somewhat more effective than noise interference and, all other things being equal, provides a higher spectral noise density.

The reasons that impede the achievement in the prototype of the technical result provided by the invention are its relatively low efficiency and difficulty of implementation. This is especially true when suppressing systems with pseudo-random tuning of the operating frequency (MFC).

The fact is that these systems have a fairly wide range of frequency tuning, so the formation and simultaneous emission of polyharmonic signals in this entire range is extremely difficult, although to a lesser extent than in the case of noise interference. In most cases, this task is generally impossible. It should be noted that the suppressed receiver, as a rule, moves in space relative to the interference station, and, in principle, can be at a sufficiently large distance from the interference station, which directly reduces the interference power in proportion to the square of this distance. In addition, the simultaneous emission of a large number of harmonic signals virtually eliminates the reception of a sounding information signal during this radiation, and the transmitter of the suppressed system during this time can change some of the carrier frequencies, or all of them, which will also ultimately reduce the effectiveness of the interference.

The technical problem to which the invention is directed is to simplify the feasibility of the method and increase the efficiency of the REP.

The technical result is achieved by the fact that in the known REP method, the radio communication systems continuously measure the coordinates of the carriers of the transmitter and receiver of the suppressed system, the aircraft is used as the carrier of the REP complex, while this carrier is held at a point in space on the transmitter-receiver line at the minimum possible distance from the receiver, if a phase-manipulated signal is detected in the received probe information signal of the transmitter of informational radio pulses, I abruptly change The carrier frequency measured from pulse to pulse according to a random law measures their duration, repetition period, and carrier frequencies; if the measurement results correspond to the catalog values of the probing information signal of the suppressed system, interference signals are generated, which are radio pulses with the same duration, repetition period, and carrier frequency that the received sounding information pulses, but delayed relative to the time taken on the order of 0.2 microseconds and without phase manipulation tion, wherein each of the interference pulses are formed from the initial part of the probe corresponding to the received information by measuring its radio pulse carrier frequency and forming unmodulated radio pulse duration corresponding to this frequency.

To achieve a technical result in the known method of REP of a radio communication system based on the reception of a sounding information signal of a suppressed system, reproduction of its carrier frequency, generation of an interfering signal, its amplification and radiation in the direction of the suppressed means, the coordinates of the carriers of the transmitter and receiver of the suppressed system are continuously measured, as the carrier of the REP complex use an aircraft, while holding this carrier at a point in space on the line "transmitter-receiver" on the minimum possible distance from the receiver, when a phase-manipulated signal with a carrier frequency that randomly changes from pulse to pulse is detected in a received probe information signal of a transmitter information signal, their duration, repetition period and carrier frequencies are measured randomly, if the measurement results correspond to the catalog values of the parameters of the probing information the signal of the suppressed system form interference signals, which are a radio pulse with the same duration, repetition period and carrier frequency as the received sounding information pulses, but delayed relative to the received for a time of the order of 0.2 microseconds and without phase manipulation, while each of the jamming pulses is formed from the initial part of the corresponding received sounding information pulse by measuring its carrier frequency and forming a modulated radio pulse of appropriate duration at that frequency.

The set of newly introduced actions to keep the REP complex at a minimum distance from the suppressed receiver and generate interference signals at the same frequencies as the sounding information radio pulses, and almost simultaneously with them, does not follow explicitly from the prior art. There are no sources of information in which these actions alone or in combination with the rest of the actions of the method would be described. This allows us to consider the claimed method of REP new and having an inventive step.

The invention is illustrated in the drawing, in which Fig. 1 shows the relative position of the carrier 1 of the transmitter of the suppressed system, the carrier 2 of its receiver and the carrier 3 of the REP complex that implements the inventive method.

As carrier 1, for example, an AWACS aircraft with a transmitter of the suppressed Jitids system can serve, as carrier 2, a surface ship on which one of the receivers of this system is installed, and as carrier 3, a helicopter or unmanned aerial vehicle, on which installed complex REP, which implements the inventive method.

The proposed method is as follows.

The coordinates of all three carriers 1, 2, 3 are constantly measured, on which a transmitter, a suppressed receiver, and a REP complex are mounted. From the measured coordinates of the media 1 and 2 determine the direction of "media 1 - media 2". The position of the carrier 3 in space is controlled so that it is constantly held on the line "carrier 1 - carrier 2" at the minimum possible distance R from carrier 2, while the receiving antenna of the REP complex installed on it would be directed towards carrier 1, and the transmitting - towards the carrier 2 of the receiver of the suppressed system.

A transmitter installed on the carrier 1 generates, amplifies and radiates in the desired directions, including the direction of the carrier 2, a probing information signal, which is a radio pulse of a phase-shifted signal with a duration of about 6 μs and a repetition period of about 25 μs. The carrier frequency of these pulses varies stepwise from pulse to pulse according to a pseudo-random law in the range of about 250 MHz with a step of at least 5 MHz (about 50 fixed frequencies). Each of the radio pulses is a sequence of about 30 packages with a duration of 0.2 μs each carrier frequency, and each package corresponds to 1 or 0, which is determined by phase shift keying. Thus, the information in the probing information signal is transmitted due to its phase manipulation.

Possible limits for changing the parameters of the described signal are recorded in the computer memory of the REP complex in the catalog of suppressed means.

In the REP complex on the carrier 3, a sounding information signal emitted by the transmitter is received, the duration, the repetition period and the carrier frequencies of the sounding information radio pulses are measured, and the presence of phase manipulation is determined in them. The measurement results are compared with catalog values. In case of compliance, they decide on the REP. For this, interference signals with measured carrier frequencies are generated.

Each of the interfering signals is formed from the initial part of the corresponding received sounding informational radio pulse. To do this, measure its carrier frequency, which takes about 0.2 microseconds. At this frequency, a modulated radio pulse is formed with a duration equal to the duration of the received radio pulse. Thus, the generated jamming radio pulse has the same frequency as the received one and is delayed relative to the time taken on the order of 0.2 microseconds, while there is no phase manipulation in it. The generated interfering signal is amplified and emitted in the direction of the carrier 2.

As a result, at the input of the suppressed receiver, together with each of the probing information radio pulses, during the entire period of its operation of the order of 6 microseconds, with the exception of a short pause of the order of 0.2 microseconds, an interfering radio pulse operates at the same frequency, but without phase shift keying. With a significant energy excess of the interfering signal over the information one, it is not possible to decode the probing information signal.

Let us evaluate the coefficient K _{P of the} excess of the interfering signal over the probing information for the typical parameters of the suppressed means and the REP complex and their relative position:

PG _P = 3 · 10 ⁴ W - energy potential of the suppressed communication system;

PG _REP = 10 ⁴ W - energy potential of the complex REP;

γ _P - 0.5 - the coefficient of mismatch of the polarization of the suppressed and interference signals;

D = 150,000 m - distance "carrier 1-carrier 2";

R = 5000 m - distance "carrier 2-carrier 3".

The calculation of the coefficient K _P can be made by the formula:

$$K_P=\frac{P{G}_{REP}\cdot D^2\cdot {\gamma }_P}{P{G}_P\cdot R^2}$$

_.

Substituting the numerical values, we obtain:

. $$K_P=\frac{{10}^{\mathrm{four}}\cdot {5000}^2\cdot 0,5}{3\cdot {10}^{\mathrm{four}}\cdot {\mathrm{150,000}}^2}=150$$

.

Thus, the coefficient of excess of the interfering signal over the probing information signal is K _P = 150, that is, 24.8 dB, which is quite enough to effectively suppress the latter.

In the prototype method, the distance R between the carriers 2 and 3 is not controlled in any way and in the general case can significantly exceed 5 km. It can be, for example, (50 ÷ 100) km.

, где Δf_пр - полоса пропускания приемника подавляемой системы, Δf - диапазон перестройки несущих частот зондирующего информационного сигнала.In the prototype method, the coefficient K _P should be further multiplied by the ratio $$\frac{\Delta f_{PR}}{\Delta f}$$

Where Δf _ave - bandwidth of the receiver system suppressed, Δf - tuning range of carrier frequencies of the probing information signal.

и К_П=0,03, что явно недостаточно для подавления информационного сигнала.Taking typical values Δf _ave = 5 MHz and Δf = 250 MHz and R = 50km, we obtain $$\frac{\Delta f_{PR}}{\Delta f}=0,2$$

and K _P = 0.03, which is clearly not enough to suppress the information signal.

To ensure an acceptable value of the suppression coefficient K _P ≈20 ÷ 30, the energy potential PG of the _REB complex of the REB complex must be increased by at least two orders of magnitude, which is extremely difficult.

In addition, in the prototype method, noise is continuously emitted, which does not allow any signals to be received during radiation due to the limited isolation between the receiving and transmitting antennas of the REP complex. This further reduces the effectiveness of suppressing the radio communication system if, during exposure to interference, all carrier frequencies or part of them in the probing information signal are changed.

In the claimed method, the interfering signals are emitted synchronously with the received signals with a duty cycle of approximately two, so nothing prevents the reception of sounding information signals in the pauses between the emitted interference.

In accordance with the foregoing, we can conclude that the effectiveness of the proposed method is higher than that of the prototype method, while its implementation requires less than the implementation of the prototype method, the energy potential.

The proposed method of REP is quite easy to implement. The coordinates of the carrier 3 can be determined using a specially installed satellite navigator on it. The coordinates of the carriers 1 and 2 - using specialized means of opening the radio environment, which are part of the radar equipment of the carrier 3. The REP complex, which receives the probing information signal, analyzes, generates, amplifies and emits interference, can be implemented on the same elements as those mentioned Above analogues are jamming stations protected by RF patents Nos. 2103705, 29818 and 29198.

Claims (1)

A method of electronic suppression of a radio communication system based on the reception of a sounding information signal of a suppressed system, reproduction of its carrier frequency, generation of an interfering signal, its amplification and radiation in the direction of the suppressed means, characterized in that the coordinates of the carriers of the transmitter and receiver of the suppressed system are continuously measured, an aircraft is used as the carrier of the REP complex, while this carrier is held at a point in space on the transmitter-receiver line at the minimum possible distance from the receiver, if information is detected in the received probe information signal of radio pulses of a phase-shifted signal with a carrier frequency randomly varying from pulse to pulse, their duration is measured If the measurement results correspond to the catalog values of the probing information signal of the suppressed system, interference signals are generated, which are radio pulses with the same duration, repetition period, and carrier frequency as the received probing information pulses, but delayed relative to the received ones for a time of the order of 0.2 microseconds and without phase manipulation, while each of the jamming pulses is formed in the form of an unmodulated radio the pulse of the same duration as that taken by the information probing radio pulses.