The way of interference with radar stations (options)

 

(57) Abstract:

The way of interference with radar stations (RLS) is that taking impulses suppressed radar reconnaissance device station interference, measure the angular coordinates of the radar relative to the station interference (azimuth and elevation), measure the periods of the pulse radar or duration of the pulse packet (for suppression of pulse Doppler radar) to measure the transit time of electromagnetic radiation distance radar station interference-radar (size 2tp) emit radio interference in response to each pulse from the radar, or in response to the first pulse of each packet delayCemit interference with the maximum capacity of the station interference (Pmaxin the course of time pafter which abruptly reduces the interference power to the level of Pminand this level is kept in a period of time equal to the difference between the repetition period of pulses of the radar (or duration tutu) Tandand valuepand for each suppressed radar value of Pmindetermined by the formula:

,

valueCandpdetermined by the formula:

,

or by the formula:

,

where c is the propagation velocity Electrometry effective size 2tpdetermined by radar radar or object on which it is installed, using as a locator station interference.

The technical result of the invention is a reduction in the average power of the interference and power consumption of the transmitter. 4 C. and 1 C.p. f-crystals, 9 Il.

The invention relates to a method of malfunction (suppression) electronic devices (radar, communications, navigation and other stations) by exposing them to prevent electromagnetic interference oscillations. The invention can be used for jamming radar stations (RLS).

Many devices designed for jamming radio-electronic systems, is the problem of reducing energy consumption. It is especially acute in high-grade stations interference with powerful transmitters and large antennas. Such stations are energy-intensive power sources and placed on heavy vehicles, which makes them immobile and vulnerable.

There is another problem: the station interference often need to work simultaneously on multiple objects suppression. But at the same time it is desirable that the be of cardinal problems are solved only in the case if you apply mode radiation noise to reduce the energy consumption of the most energy-intensive elements of the transmitter (for example, the output stage of the amplifier).

One of the possible ways to solve the aforementioned problems in the stations of interference designed to suppress radar (RLS), is the change in the interference power depending on the distance from the radar to the object (target), masked noise.

It is known that at constant energy potential station interference and constant distance station interference-suppressed radar ratio of the power noise and signal at the receiver input RLS increases with increasing distance between the radar and covers a noise object [1, s 83] Therefore, objects that are at a relatively small distance from the radar, it is necessary to cover a powerful noise at large distances is less powerful. However, in this case the moments of emission and switching power of interference should be associated with the moment of emission of the probe pulse radar station, i.e. station interference must operate in reply to interference.

The mode of response interference is widely used in stations interference. There is a method of sozdana station interference and then to the input of the intelligence of the receiver. Using the antenna and receiver is determined by the direction of the radar, the repetition period of its radio pulses and the duration of the burst. From the output of the intelligence of the receiver signal is supplied to a delay circuit providing a delay of the received pulse at a specified time. Then in response to each accepted and the delayed pulse radar is formed a series of interference pulses, which are amplified and emitted transmitting antenna station interference.

Also known a method of creating a simulation of impulse noise [1, C. 125] which is taken as a prototype of the invention, consisting in the following. The radar pulse radiated suppressed radar, is fed to the input of the receiving antenna station interference, and then amplified and analyzed intelligence receiver. The analysis determined the direction of the radar (azimuth and elevation), the repetition period of its pulses and the duration of the burst. From the output of the intelligence of the receiver signal is supplied to a delay circuit providing a delay for a specified time. Then in response to each received pulse radar is formed by one pulse noise, which is amplified and radiated by the transmitting antenna station interference. Time the AI from the station interference choose from technical considerations.

However, in ways analogous and the prototype, there is no change in the interference power depending on the distance between the radar and disguised objects, so these methods do not allow to reduce the average radiation power. In addition, when changing the power of interference should radiate so that interference with greater capacity covered closest to the radar zone space, and with little more remote. This mode of radiation in ways analogous and the prototype is impossible for two reasons. First, for its realization it is necessary to know the propagation time of electromagnetic radiation distance radar station interference and back; but this time equivalents and the prototype is not provided. Second, there is no way to use information about the time passing.

We propose a method of interference with radar stations that allow you to change the capacity of interference depending on the distance from the radar are objects, masked interference. The method can be applied to suppress pulse and pulse Doppler radar. The technical result of this method is the reduction in the average radiation power and, as SL is the implementation of the invention, associated one izobretalem plan.

the 1st and 2nd options.

The way interference is that the station interference with the intelligence of the device are radio pulses emitted suppressed radar to measure the angular coordinates of the radar relative to the station interference (azimuth and elevation), measure the periods of the sequence of radio pulses for suppression of pulse radar or duration of packs of radio pulses having the same repetition period, the suppression pulse Doppler radar and emit radio interference in response to each pulse radar pulse from the radar, or in response to the first pulse of each stack of radio pulse Doppler radar with a delay relative to the moment of their reception.

According to the invention for creating interference measure the transit time of electromagnetic radiation distance radar station interference-radar (size 2tp) and delayed radiation interferenceCset equal

C=and- 2tp(1)

where Tandthe period of the pulse radar (for suppression of pulse radar) or the duration of a pack of radar pulses having the same repetition period (when the suppression pulse Doppler radar). Since ncii interference Pmaxthen abruptly reduce the interference power to the level of Pminand this power level is kept in the course of time, equal to:

the suppression pulse radar the difference between the repetition period of the radar pulses and the value ofp< / BR>
the suppression pulse Doppler radar the difference between the duration of a pack of radar pulses having the same repetition period, and the value ofp< / BR>
The values ofpand Pmindetermine for each suppressed radar according to the formula:

< / BR>
where C is the velocity of propagation of electromagnetic energy;

Rminthe minimum distance between the radar and the masked obstacle object, which is still retained effective power ratio of the interference/signal at the input of the radar receiver at the maximum radiation power station interference.

To determine the magnitude 2tpstation interference radiates in the direction of the radar is a series of radio pulses, receives pulses reflected from radar or object on which it is installed, and measures the time interval between the moments of their radiation and reception.

Comparative analysis of the first variant of the proposed method with analogues and the prototype shows that the distinctive features invented the drug (size 2tp);

the delay radiation interference equal to the amount determined by the formula (1);

radiation interference over timepwith a capacity equal to the maximum power station interference Pmaxabrupt reduction of the radiation power to the level of Pminand maintaining this level for a time equal to Tand-pwhere Tandthe period of the pulse radar (for suppression of pulse radar) or packet duration pulses having the same repetition period (when the suppression pulse Doppler radar);

the job parameterspand Pminequal quantities defined by the formulas (2) and (3);

determination of size 2tpusing station interference by radiation in the direction of the radar series of pulses, the reception of the reflected pulses and measuring the time interval between emission and reception.

Features of the invention allow to draw a conclusion on the conformity of the proposed technical solution the criterion of "novelty". The features distinguishing the claimed technical solution to the prototype, not identified in other technical solutions in learning how to create radio interference devices and, consequently, of the s.

The way interference is that the station interference with the intelligence of the device are radio pulses emitted suppressed radar to measure the angular coordinates of the radar relative to the station interference (azimuth and elevation), measure the periods of the sequence of radio pulses for suppression of pulse radar or duration of packs of radio pulses having the same repetition period, the suppression pulse Doppler radar and emit radio interference in response to each pulse radar pulse from the radar, or in response to the first pulse of each stack of radio pulse Doppler radar with a delay relative to the moment of their reception.

According to the invention for creating interference measure the transit time of electromagnetic radiation distance radar station interference-radar (size 2tp) and delayed radiation interferenceCset equal

< / BR>
where Tandthe period of the pulse radar (for suppression of pulse radar) or the duration of a pack of radar pulses having the same repetition period (when the suppression pulse Doppler radar);

With the speed of propagation of electromagnetic energy;

Rminthe minimum distance between the radar and the masked pKa radar with a maximum radiation power station interference.

Since radiation over timepradiate interference with a capacity equal to the maximum radiation power station interference Pmaxthen abruptly reduce the interference power to the level of Pminand this power level is kept in the course of time, equal to:

the suppression pulse radar the difference between the repetition period of the radar pulses and the value ofp< / BR>
the suppression pulse Doppler radar the difference between the duration of a pack of radar pulses having the same repetition period, and the value ofp< / BR>
The values ofpand Pmindetermine for each suppressed radar by formulas

< / BR>
To determine the magnitude 2tpstation interference radiates in the direction of the radar series radiopulse, receives pulses reflected from the radar or from the object on which it is installed, and measures the time interval between the moments of their radiation and reception.

Comparative analysis of the second variant of the proposed method with analogues and the prototype shows that the distinctive features of the invention are:

measuring the travel time of electromagnetic radiation distance radar station radar interference (size 2tp);

the delay) the power equal to the maximum power station interference Pmaxabrupt reduction of the radiation power to the level of Pminand maintaining this level for a time equaland-pwhere Tandthe period of the pulse radar (for suppression of pulse radar) or packet duration pulses having the same repetition period (when the suppression pulse Doppler radar);

the job parameterspand Pminequal quantities defined by the formulas (5) and (6);

determination of size 2tpusing station interference by radiation in the direction of the radar series of pulses, the reception of the reflected pulses and measuring the time interval between emission and reception.

Features of the invention allow to draw a conclusion on the conformity of the proposed technical solution the criterion of "novelty". The features distinguishing the claimed technical solution to the prototype, not identified in other technical solutions in learning how to create radio interference devices and, therefore, provide the claimed solution according to the criterion of "inventive step".

The proposed method is illustrated by drawings.

Fig is in; in Fig. 2 change of power of noise in time and the position of the interference pulses relative to the pulses emitted by the radar and reflected from the target; Fig. 3 the position of the interference pulses relative to the pulses emitted by the radar and reflected from the targets, the suppression pulse radar; Fig. 4 the position of the interference pulses relative to the pulses emitted by the radar and reflected from the targets, the suppression pulse Doppler radar; Fig. 5 the position of the pulses emitted by the radar and pulse interference with the delay of the latter relative to the end of the radiation pulse radar; Fig. 6 the position of the pulses emitted by the radar and pulse interference in the case of the simultaneous suppression of the two radars; Fig. 7 the dependence of the energy gain from the relationship of the capacity of the Pmax/PminFig. 8 - dependence of the lg(Pmax/Pminfrom argument lg(2Rmin/CTand); Fig.9 is a functional diagram of the station interference implements the proposed method (both).

Thus here we have introduced the following notation:

1 receiving antenna; 2 reconnaissance receiver; 3 receiver mode radar; 4 computational-command device; 5 pulse shaper interference; 6 switch; 7 power supply o the spine; 11 output amplifier of the transmitter; 12 adder; 13 - transmitting antenna.

All devices included in the station interference, can be performed on the basis of the known circuits and structures, selected depending on the requirements of the station. The antenna 1 may be, for example, mirror, horn, or vibrator. Reconnaissance receiver 2 may be constructed according to the scheme of direct gain or superheterodyne circuit. Receiver mode radar 3 should have high sensitivity, so it must be built according to the superheterodyne circuit. Computing-command device 4 can be made in the form of a set of filters, analog-to-digital and digital-to-analogue converters, microprocessors, small machines, etc., the pulse Shaper interference 5 may be performed, for example, in the form of a multivibrator. The switch 6 may be performed, for example, according to scheme e key on a powerful triode [4] the power Source 7 may be performed, for example, under the scheme of the transformer-rectifier. The master oscillator of the transmitter 8 may be performed, for example, in the form of noise solid-state generator. Pre-amplifier 9 may be performed, for example, on the basis of Lam is allowedno tap [3, S. 344, 354] the Output amplifier 11 can be performed, for example, on the basis of the lamp of the traveling wave. The adder 12 may be made on the basis of circulators or waveguide bridges [4, S. 426, 474] the Antenna 13 may be for example, a mirror, of the vibrator.

Show a causal connection characteristics of the invention with achievable technical result. To do this, refer to Fig. 1, 2, 3 and 4.

Let radar (radar) observes two targets (a and b), are from her at distances RAand RBand RA< RB(see Fig. 1). The power of the radar signal reflected from the target, on input of the receiver is equal to the value [2, C. 28]

< / BR>
where a constant multiplier.

Therefore, under equal conditions (equal effective surface scattering purposes, the same attenuation in the medium of propagation of electromagnetic waves, and so on) signal from the first target (qA) will be greater than the second (qB).

At the same time, to mask the interference signals it is necessary that the power P at the input of the radar receiver exceeded the power of the signal in Kptimes, where Kpsuppression factor [1, C. 79] Therefore, when a constant Kpwill have

< / BR>
Followed with a specified rate suppression. Therefore, the radiation power station interference can be reduced by increasing the distance the radar-target.

It is desirable to reduce power interference was accompanied by an adequate reduction of the power consumption of the transmitter. But with the use of modern electronic devices this condition is not met. For example, traveling wave tubes, klystrons, semiconductor devices, etc., the change in n times the intensity of the electron flow, which is the radiation source and the main consumer of energy, leads to the change of the radiation power in N > n times, i.e., changes in the radiation power and energy not adequate. Adequacy is achieved only if the electron flow is interrupted and resumed abruptly, that occurs when a pulsed supply voltage on the device.

These conditions allow us to offer the obstacle in the form of pulses, the shape of which is shown in Fig. 2 as a solid line. At the time of opening of the radar receiver (time t0), i.e. at the end of the radiation probing radar pulse (ZI), the interference power at the receiver input must be maximum (Pmaxand to remain so for some timepLS (reflected pulse the OIA), will hide behind the obstacle at a power level of Pmaxand the objective In (impulse OIV) - level of Pmin. At this power level Pminmust be such that for targets from the radar at a distance of R0,5Cpthe suppression ratio was not less than for targets at a distance of R < 0.5 C pthe signal from which is under the influence of the interference power Pmax.

At the end of the next excitation pulse radar power of interference should the leap to grow to a value of Pmaxthen through timepagain be reduced to the level of Pminand so to move from one level to another during the whole time of the suppression of the radar.

When radiation with a constant power of interference should provide masking purposes, the least remote from the radar, i.e., must have a power of Pmax. Therefore, as can be seen from the drawing of Fig. 2, the proposed method can reduce the average power of the radiation and, therefore, the power consumption of the transmitter.

To implement the method, the station must operate in the mode of response interference. The process of suppression pulse radar is explained using Fig. 3. At time t0The radar emits a probing radar pulse SY, the cat is C after receiving the station interference emits interfering pulse IP that after time tpreaches the entrance of the station. It is evident from Fig. 3 shows that will be performed if the condition

2tp+C= Tand(9)

where Tandthe repetition period of the probing radio, radar, and then start interfering pulse at the input of the radar receiver coincides with the end of the probe pulse SI, i.e. from the moment of opening of the receiver to receive the reflected pulses. After receiving the probe pulse THE station interference emit a second pulse IP2 at the input of the radar receiver at the end of the radiation of the probe pulse SI etc.

From (9) it follows that the delay time of the radiation station interference must be equal to

C= Tand- 2tp(10)

The process of suppression pulse Doppler radar is explained using Fig. 4. As you know, these radars emit pulses with a low repetition period tand[5, S. 63] To provide an unambiguous reference range for distances radar-target exceeds the value of 0.5 Ctandapplies the change of the periods of the pulse. Usually the change is accomplished through regular periods of time Tctandand the number of shifts 2 4. Sledovatel the pulse inside the bundle tand. To select the signals reflected from the targets, and unambiguous measurement range diagrams coincidence of pulses in time.

In Fig. 4 shows the case when emitted two packs of pulses with periods t1and tS2. The waveform of the first bundle is marked with the letter D, the second E, and the waveform at the output of the circuit matches the letter G. Probing radar pulses numbered 1, 2, 3, etc. for the convenience of explanation, the pulses of both packs are numbered. The change occurs after periods of pulse 5, and this impulse is the first in the second bundle. The pulses reflected from targets A and B (see Fig. 1), numbered 1A, 1B, 2A, 2B, etc. and the number in the number corresponds to that of the probe pulse that caused this reflected pulse, and the letter corresponds to the purpose. Waveform G shows that the momentum from the goal a is a result of convergence of the reflected pulses 1A and 5A, on the purpose of the B pulse 1B and 5B. The rest of the reflected pulses do not pass on the indicator radar, so the interference power, which they are covered, can be anything, including this, which does not provide suppression.

This circumstance allows to interfere with the variable capacity of the same sue must be received at the input of the radar receiver at the end of the radiation of the first pulse of each pulse packet (Fig. 4 pulses 1 and 5). The duration of radiation with high power as in the case of suppression pulse radar must be equal topand with a small Tc-pIn the further description of the values of Tcand Tandwe will denote by the same symbol Tand.

The value of Tandis determined in the exploration of the radar radiation. Size 2tpincluded in (9) and (10), it is proposed to determine the method of radiolocation. To do this, after the discovery of radiation and determine the direction to the radar station interference radiates in the direction of a bundle of impulses, receives pulses reflected from the radar or from the object on which it is installed, and determines their delay relative to the time of radiation. The duration of the delay is the value of 2tp. There may be other ways to determine this quantity, we present two of them.

1. The coordinates of the radar object of suppression by radar, included in the same battle group with the station interference, and calculating on the basis of their size 2tp.

2. Determination of the angular coordinates of the two radar stations interference determination of size 2tpby solving the triangle station 1-station 2-station.

The method is based on using the metro pomi with other objects.

Pay attention to the following fact. When reducing the distance between the radar and the targets up to some value of Rmin> 0 may be a situation when due to the increased power of the signal reflected from the target, the interference becomes ineffective [1, s 83] Therefore, to cover up noise targets located at distances from the radar RRminit is not practical. This allows you to start the disturbance is not the end of the probe pulse, and after a whiled2Rmin/S (see Fig. 5). At this time of the interfering pulse, at which the maximum radiation power is reduced by the value ofdwhich leads to additional reduction of energy consumption. The delay time of the radiation station interference in this case must be equal to

< / BR>
The value of Rminincluded in the formula fordcan be defined at development station interference on the basis of equation protivoradiolokatsionnoy for active interference [1, s 83] Included in this equation the parameters are usually well-known developer. In that case, if some parameters have a certain range of values (for example, surface scattering purposes, the radiation power of the radar and so on), the value of Rminalso Boo in the system control station and select the desired value in the combat work depending on the situation;

from the entire range to choose one or two values of Rminaccording to some criterion (for example, effective masking purposes with the greatest surface scattering) and use them when developing station.

The proposed method can be applied for simultaneous suppression of multiple radars, and the average interference power exceeds the power of the radiation with constant power. In Fig. 6 shows a case of suppression of the two radars. Station interference sequentially receives the probing pulses of the two radars (SI and TI). In response to the first pulse through time1radiated impulse noise with maximum power and durationP1In response to a second pulse through time2radiated pulse durationP2In the General caseP1P2In the intervals between the radiation with a maximum output power minimum interference.

Derive the relation (2), (3) and (5) characterizing both variants of the proposed method. Thus let us assume that the maximum interference power at the receiver input RLS Pmaxcorresponds to the maximum radiation power station interference Pmaxand the minimum Pminthe minimum radiation power Pmin.

Ppm hindrance more effective ( i.e., saves the specified suppression ratio), is equal to Rmin. Suppose to cover the same targets from the radar at a distance of R0>Rminsufficient radiation power Pmin. Obviously, in this case, the length of time the radiation, with a maximum capacity must be equal to

< / BR>
At the same time, from (8) it follows that

< / BR>
Solving equation (13) with respect to R0and substituting the value obtained in (12), we have

< / BR>
When radiation with constant power Pmaxenergy interference Qpduring the period between two pulses of the radar will be equal to

QpPmaxTand< / BR>
With the proposed method, and when the onset of action of interference combined with the end of the probe pulse radar, energy interference Qcduring the period between the two pulses is equal to

Qc= Pmaxp+ Pmin(Tand-p)

Therefore, the energy gain, in comparison with the case of radiation with constant power will be equal to the value of

< / BR>
Substituting the value ofpdefined by the formula (14), (17) we get

< / BR>
For the case when the onset of action is delayed interference in relation to the moment BR>
< / BR>
In Fig. 7 presents the dependence of Qp/Qc= f(Pmax/Pmin), with the solid line for the case of coincidence of the beginning of action interference with the end of the excitation pulse, and dashed for the case when the onset of action is delayed by the value ofdThe calculations are carried out for Tand510-3with two values of Rmin30 and 50 km can be Seen that the dependencies are extreme in nature: under certain Pmax/Pmina coding gain of Qp/Qcmaximum.

Define the relationship between the ratio Pmax/Pminwhere is the maximum energy gain, and the parameter L 2Rmin/CTand. To this end we define the extrema of functions (18) and (20) variable Pmax/Pmin. Calculating the first derivatives of the functions and equating them to zero, in both cases get the same equation:

< / BR>
The results of the numerical solution of this equation for the most probable values of L lying in the range 10-4. 10-1shown in the graph of Fig. 8 in the form of the dependence lg(Pmax/Pmin) f[lg(2Rmin/CTand)] We see that the relationship is a straight line. Therefore, using uranbaigal will take place with respect to Pmax/Pminequal

< / BR>
Therefore, if the maximum radiation power station interference and it is known that when this power is provided by the minimum distance radar-target, at which the disturbance is more efficient, equal to the value of Rminto get the maximum energy of a prize value of Pminyou must choose equal

< / BR>
Substituting (22) into (14) and (19), we obtain the duration of the radiation interference with the maximum power, which provides the highest energy gain:

the coincidence of the beginning steps interference with the completion of the radiation of the probe pulse radar

< / BR>
when the delay steps interference on timed< / BR>
< / BR>
Relations (23), (24) and (25), providing the greatest energy gain, the basis of the proposed method.

Here is an example. Let Rmin10 km, Tand10-3C, Pmax1000 watts. Using (22), we obtain that the optimal value of Pmax/Pminproviding the highest energy gains as well 23,9. The intensity of the radiation with a low level must be equal to 42 watts. Energy gain, in comparison with the radiation constant power and duration, and the em radiation of the probe pulse radar:

< / BR>
when the delay steps interference on timed< / BR>
< / BR>
When Rmin5 km and the same as before, Tand10-3with the greatest energy gain will be at the Pmax/Pmin42,1. The value of winning, and the duration of radiation with a maximum output will be:

the coincidence of the beginning steps interference with the completion of the radiation of the probe pulse:

< / BR>
when the delay steps interference on timed< / BR>
< / BR>
The example shows that the proposed method can significantly reduce the average radiation power station interference and, as a consequence, the power consumption of the transmitter.

Consider the option of building a station interference that implements the proposed method (both). Its functional scheme is shown in Fig. 9, and the principle of operation is as follows.

The radio, radar, and subject to suppression arrive at the receiving antenna 1, and then to the entrance of the intelligence of the receiver 2. In the receiver the pulses are amplified, filtered, detected and fed to the input of a computing command device 4. The device 4 measures the angular coordinates of the radar (azimuth and elevation), the period of the pulse radar when UB>). Then at the command device 4 master oscillator of the transmitter 8 generates a series of radio pulses, which are amplified prior 9 and output amplifiers 11 and emitted transmitting antenna 13 in the direction of the suppressed radar. The pulses reflected from the radar or object on which it is installed, are received by the antenna 1 is amplified and detected by receiver mode radar 3 and fed to the computing-command device 4. This determines the delay time of the reflected pulses with respect to their radiation and thereby determines the magnitude of the 2 tp. Then in the device 4 calculates the delay radiation interferenceCthe duration of radiation with maximum capacitypand station mode interference.

Mode interference pulses suppressed radar are received by the antenna 1 is amplified by the receiver 2 and fed to the computing-command device 4. Through timeCafter taking device 4 starts the pulse shaper interference 5, which gives the switch input 6 pulse durationp. To another input of the switch is connected to the power supply 7 output amplifier of the transmitter 11. At the moment the pulse supply nerino master oscillator 8 and amplified by pre-amplifier 9. From the output of the pre-amplifier 9, the signal at the power divider 10 having two outputs. With one signal with power Pminthrough the adder 12 is supplied to the transmitting antenna 13. Another output signal with power Pmax/Kywhere TOythe gain of the output amplifier, is input to the output of the amplifier 11. During the time when the output of the amplifier goes to a supply voltage, at the output of the amplifier acts of interfering pulse power Pmaxwho in the adder 12 is added to the interference coming from the divider 10, and is supplied to the transmitting antenna 13. Since Pmax>> Pminit may be considered that when applying to the output amplifier of the pulse voltage emitted interference with power Pmaxin the pauses between the pulses with a power of Pmin.

Sources of information

1. Wakin S. A. Shustov L. N. The basics of jamming and electronic reconnaissance. M. the Soviet radio, 1968, S. 123 (analogues), 125 (prototype), 79, 83.

2. The reference radar. so 1. M. "Soviet radio", 1979, S. 28.

3. Volman C. I. Pimenov Y. C. Technical electrodynamics. M. Bond, 1971, S. 344, 354, 426, 474.

4. Hania. Auth. mon. N 736347 from 18.11.77. BI N 19, 1980.

5. The reference radar. so 3. M. the Soviet radio, 1979, S. 363.

1. Way interfering pulse radars (radar), consisting in the fact that you accept the impulses suppressed radar reconnaissance device station interference, measure the angular coordinates of the radar relative to the station interference, measure the distance between radar and radio emit radio interference in response to each radar pulse radar with a delay relative to the moment of their reception, characterized in that the measured transit time of electromagnetic radiation distance radar station interference-radar, delay radiation interference set equalCsince the start of its radiation in the course of timepradiate interference with a capacity equal to the maximum radiation power station interference Pmandtowith, abruptly reduce the interference power to the level of Pmandnand this power level is kept in a period of time equal to the difference between the repetition period of the radar pulses and the value ofpwhile valuesC,pand Rmandndetermine for each suppressed radar by formulas

C= Tand- 2tp
c the speed of propagation of electromagnetic radiation;

Rmandnthe minimum distance between the radar and the masked obstacle object, which is still retained effective power ratio of the interference/signal at the input of the radar receiver at the maximum radiation power station interference.

2. Way interfering pulse-Doppler radars (radar), consisting in the fact that you accept the impulses suppressed radar reconnaissance device station interference, measure the angular coordinates of the radar relative to the station interference, measure the length packs of radio pulses having the same repetition period, and emit radio interference in response to the first pulse of each stack of radio radar with a delay relative to the moment of their reception, characterized in that the measured transit time of electromagnetic radiation distance radar station radar interference, delay radiation interference set equalCsince the start of its radiation in the course of timepradiate interference with a capacity equal to the maximum radiation power station interference Pmandtowith, abruptly reduce the interference power to the level of Pmandnand e is the same repetition period, and valuepwhile valuesC,pand Rmandndetermine for each suppressed radar by formulas

C=c- 2tp;

< / BR>
< / BR>
where Twiththe duration of a pack of radar pulses having the same repetition period;

tpthe transit time of electromagnetic radiation distance radar station interference;

c the speed of propagation of electromagnetic radiation;

Rmandnthe minimum distance between the radar and the masked obstacle object, which is still retained effective power ratio of the interference/signal at the input of the radar receiver at the maximum radiation power station interference.

3. Way interfering pulse radars (radar), consisting in the fact that you accept the impulses suppressed radar reconnaissance device station interference, measure the angular coordinates of the radar relative to the station interference, measure the distance between radar and radio emit radio interference in response to each radar pulse radar with a delay relative to the moment of their reception, characterized in that the measured transit time of electromagnetic radiation distance radar station interference>radiate interference with a capacity equal to the maximum radiation power station interference Pmandtowith, abruptly reduce the interference power to the level of Pmandnand this power level is kept in a period of time equal to the difference between the repetition period of the radar pulses and the value ofpwhile valuesC,pand Rmandndetermine for each suppressed radar by formulas

< / BR>
< / BR>
< / BR>
where Tandthe period of the pulse radar;

tpthe transit time of electromagnetic radiation distance radar station interference;

c the speed of propagation of electromagnetic radiation;

Rmandnthe minimum distance between the radar and the masked obstacle object, which is still effective against interference/signal at the input of the radar receiver at the maximum radiation power station interference.

4. Way interfering pulse-Doppler radars (radar), consisting in the fact that you accept the impulses suppressed radar reconnaissance device station interference, measure the angular coordinates of the radar relative to the station interference, measure the length of the packs radioindy packs of radio radar with a delay relative to the moment of their reception, characterized in that measure the transit time of electromagnetic radiation distance radar station radar interference, delay radiation interference set equalCsince the start of its radiation in the course of timepradiate interference with a capacity equal to the maximum power station interference Pmandtowith, abruptly reduce the interference power to the level of Pmandnand this power level is kept in a period of time equal to the difference between the duration of a pack of radar pulses having the same repetition period, and the value ofpwhile valuesC, pand Rmandndetermine for each suppressed radar by formulas

< / BR>
< / BR>
< / BR>
where Twiththe duration of a pack of radar pulses having the same repetition period;

tpthe transit time of electromagnetic radiation distance radar station interference;

c the speed of propagation of electromagnetic radiation;

Rmandnthe minimum distance between the radar and the masked obstacle object, which is still retained effective power ratio of the interference/signal at the input of the radar receiver at the maximum radiation power station pomahac radiates in the direction of the radar is a series of impulses, receives pulses reflected from the radar or from the object on which it is installed, and measures the time interval between the moments of their radiation and reception.

 

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Passive radar veil // 2044251

FIELD: technologies for preventing interception of data.

SUBSTANCE: transferred signal is concealed via adding noises to communication line in speech frequency range with linear addition of speech data signal with noise signal of higher level. Concealment is removed via adaptive filtration of received signal with compensation of noise component and separation of data component. Addition of noises to communication line is performed from the side of sensor. Noise signal during addition of noises and adaptive filtration is formed of a sum of counts of several noise series with nonevent sizes via their random querying. At the beginning of each communication session a signal is sent to side of receiver, characterizing order of querying of series, and starting signal, providing for synchronism of noises addition and filtering processes. All operations are performed by means of microprocessors, mounted on both sides of communication line, dependently of loaded software providing for change of direction of transmission and protection of speech data signal. Invention allows to simplify protection while providing for absolute confidentiality of transmitted data.

EFFECT: higher reliability.

6 cl, 4 dwg

FIELD: radio engineering; secret intelligence protected radio communication systems.

SUBSTANCE: proposed radio communication system incorporating provision for suppressing enemy's radio communication means and radio control channels has information subsystem, noise jamming subsystem, noise memory subsystem, information subsystem elements, and subsystem elements interface unit; each element of information subsystem is made in the form of multichannel time-division radio station; each element of noise jamming subsystem is made in the form of time division multichannel radio station, and each of noise jamming subsystem elements is made in the form of barrage jamming transmitter built around noise signal generating driver; used as drivers are self-stochastic generator operating in different frequency bands.

EFFECT: enhanced intelligence protection of communication channels, simplified design, enhanced reliability.

2 cl, 13 dwg

FIELD: methods for protection of an active radar against antiradar missiles.

SUBSTANCE: in the method and device for protection of radar against antiradar missiles accomplished are radiation of sounding signals, detection of antiradar missiles, guidance of anti-aircraft missiles on the antiradar missile, destruction of the anti-radar missile by blasting of the warhead of the anti-aircraft missile, guidance of the anti-aircraft missile at least during a time period directly preceding the blasting of the warhead of the anti-aircraft missile, all this is conducted on the trajectory passing in the vicinity of the imaginary line connecting the antiradar missile and the radar, in this case constantly are determined the distance from the radar to the antiradar missile Dr-arm, from the radar to the anti-aircraft missile Dr-aacm and from the anti-aircraft missile to the antiradar missile Daacm-acm, and at the time moments leading the moments of radiation of the radar sounding signal by value t=(Dr-aacm+Daacm-arm-Dr-arm)/v, where v - velocity of light, commands are given from the radar to the anti-aircraft missile for radiation of a signal simulating the radar signal.

EFFECT: reduced dynamic errors of guidance of anti-aircraft missile on antiradar missile.

3 cl, 6 dwg

FIELD: espionage protection techniques.

SUBSTANCE: method includes serial scanning of target surface by nonlinear locator, recording and processing received response in PC with displaying of positions of semiconductor devices. In case of appearance of response on target surface on command from PC visible laser is enabled, response points are lighted by it, pictured using digital camera and recorded in PC. Responses are process in conjunction with target surface image and integral picture of responses is built. On basis of received picture additionally visually detected are potentially possible places for placing semiconductor devices, and also trajectories of tracing of communications on target surface, structures of inbuilt metal construction and anomalies in said structures.

EFFECT: higher precision, higher efficiency, broader functional capabilities.

1 dwg

FIELD: radio communications.

SUBSTANCE: system has transmitting portion, which contains clock pulse generator 1, first and second D-code generators 21-22, first and second generator of double frequency manipulation 31-32, adder 4, modulator 5, frequencies synthesizer 6, pseudo-random numbers generator 7. said portion is connected through broadcast line 8 to receiving portion, which has demodulator 9, frequencies synthesizer 10, pseudo-random numbers 11, signals selector 12, clock pulses generator 13, block for selecting additional series 14, block for folding additional series 15, solving block 16. new set of significant features provides for possible implementation of distributed receipt with code structure of specific orthogonal quadruple-encoded series without expansion of available frequency resource.

EFFECT: broader functional capabilities, higher trustworthiness, higher efficiency, higher interference resistance.

2 cl, 5 dwg

FIELD: radio engineering, possible radio-technical reconnaissance of radio-electronic means of enemy.

SUBSTANCE: radio-technical reconnaissance station contains antenna device 1, receiver 2, bearing device 3, analyzer 4 of received signal parameters, device 5 for memorizing and processing received information, telemetric device 6, receiving antennae 7-9, block 10 for readjustment, first 11 and second 23 heterodynes, mixers 12-14 and 24, amplifiers 17-19 of first intermediate frequency, detector 20, first 21 and second 31 delay lines, key 22, amplifier 25 of second amplification frequency, multipliers 26,27 and 30, narrowband filters 28,29 and 32, phase detector 33, phase meters 34 and 35, engine 15 and supporting generator 16.

EFFECT: expanded area of reconnaissance and increased number of detected radio-electronic means due to positioning of radio-technical reconnaissance station onboard the helicopter.

3 dwg

FIELD: technology for generating artificial interference for concealing electromagnetic channels leaking speech information.

SUBSTANCE: in accordance to invention, method includes generation, amplification and emission of concealing noise signal, and also substantial changes and additions, namely: noise signal is amplified in mode B or AB, pulse automatic-compensating stabilization of power amplifier powering voltage is utilized, stabilized voltage is filtered by upper frequencies filter, lower limiting frequency is higher than upper frequency of audible spectrum, but lower than frequency of pulse stabilizer.

EFFECT: increased efficiency of method while power for concealed equipment is delivered by industrial alternating-current network.

2 dwg

FIELD: radio engineering, namely, equipment for generating artificial interference, possible use for protecting information from leaking along vibro-acoustic channel from a room.

SUBSTANCE: in accordance to method for protecting speech information along vibro-acoustic channel, interference is generated for masking speech signal, while interference is formed as M-series of pulses with following transformation, while transformation of M-series of pulses is performed in form of generation of vibration impact signals, by which speech signal is multiplicatively masked, while M-series of pulses is generated from period to period in accordance to random rule.

EFFECT: increased efficiency of technical means for information protection, decreased acoustic radiations, interfering with negotiations, radiations, affecting operation of nearby radio-electronic means, and also disclosing a structure of noise interference, decreasing probability of it being filtered.

2 dwg

FIELD: engineering of equipment for counteracting commercial and industrial espionage.

SUBSTANCE: device includes auxiliary transmitting-receiving antenna, antenna commutator, controllable interference generator, radio radiation detector and additional generator of interference with individual antenna. Launch circuit of controllable interference generator is connected to of radio radiation detector. The latter is made with possible recording of beginning of emission of radio interface of cell phone during its communication with external device, determining presence and frequency channel of unsanctioned communication with radio interface and adjustment of frequency of controlled interference generator. Commutator is enabled with possible switching of auxiliary antenna from input of radio emission detector to output of controllable interference generator for suppressing unsanctioned data transfer through radio interface. Output of radio radiation detector is connected to controlling inputs of commutator and controlled interference generator. For additional interference generator, mode of permanent generation of interference is set in radio spectrum of global positioning systems, excluding capability for determining coordinates of cell phone.

EFFECT: increased efficiency of cell protection from unsanctioned pickup of information from radio interface with reliable suppression of attempts of determining current location of cell phone.

3 cl, 1 dwg

FIELD: technology for creating artificial interference for masking speech information in industrial network of alternating current.

SUBSTANCE: device (dwg. 1) contains rectifier 2 and, connected serially, noise signal generator 4, noise signal power amplifier 5 and emitter 6, in noise signal amplifier 5, mode B or AB is implemented, between rectifier 2 and power chain of noise signal generator 4 and power amplifier of noise signal, impulse automatic-compensation voltage stabilizer 8 is inserted, at output of which upper frequency filter is mounted, lower cut frequency of which is higher than upper frequency of audible spectrum, but lower than clock frequency of impulse automatic-compensation voltage stabilizer 8.

EFFECT: increased protection of sound amplification equipment from possible electromagnetic leakage of sound information along power chains.

2 dwg

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