The way to create relayed interference
(57) Abstract:The invention relates to the field of radio communications and can be used when creating interference broadband communication systems. The method consists in the amplification of a received broadband signal with the duration of the elementary character of the SRP equal , remembering the implementation of duration T followed by multiple re-radiation. After amplification PSS rejection spectrum affected by noise and memorized the implementation distort the law of low-frequency SRP. The duration of the elementary character of the low-frequency SRPodetermine the ratio oTpwhere Tp- time search, a receiver, a broadband signal, whileochoose a multiple of the duration . The technical result consists in increasing the efficiency of action intentional interference by increasing the capacity of interference, distortion and radiation with different delays. 1 Il. The present invention relates to the field of radio communications and can be used when creating interference broadband communication systems.There is a method of creating relayed interference described in U.S. patent N 4228401, MKI H 04 B 7/14, which is retracage way low.The closest in technical essence to the present invention is a method of creating a relayed interference described in U.S. patent N 4103237, MKI H 04 K 3/00.This method consists in that the signal transmitter broadband signals take on the antenna, amplify, then memorize the implementation of a received signal of duration T after which it repeatedly re-radiate.This signal is perceived by the receiver operating communication system as "your", it enters into a false synchronism relayed by the obstacle, losing the information transmitted.The disadvantage of this method is low efficiency of interference.To address this shortcoming in the method lies in the strengthening of the received broadband signal with a duration of elementary symbol pseudorandom sequence are equal , memorizing its implementation duration T followed by multiple re-emission, after the signal amplification rejection parts of the spectrum affected by noise and memorized the implementation distort the law of low-frequency SRP, the duration of elementary symbolowhich is determined from the ratiooTnThe inventive method consists in the following.The emitted signal is received by the antenna, amplify, from the spectrum of the received signal rejection spectrum affected narrowband interference. The implementation of the "cleaned" from broadband interference signal of duration T remember and emit after manipulation of its phase [0,] by law, the low frequency of the SRP. The low-frequency parameters of the SRP is chosen on the basis of ratios:o= koTp. K is an integer, Tnthe time of the search receiver PSS. Tp= , - integer,o- = the duration of the low frequency element of the SRP, the duration element of the SRP relayed PSS.The radiation of the distorted signal is performed with different delays.To implement the proposed method can be used in the device shown in Fig. 1, where indicated:
1, 12 - antenna
2 - power high-frequency,
3 - block interference protection,
4 - storage device,
5 - phase arm,
6 - generator SRP,
7 - delay line,
8 - switch
9 - counter
10 - clock,
11 is an amplifier.The device includes sequentially connection is through the n delay lines 7 is connected to n inputs of the switch 8. The output of the switch 8 via the amplifier 11 is connected to the antenna 12. Clock 10 through the meter 9 is connected with another group of n inputs of the switch 8. Generator SRP 6 is connected to a second input of the phase manipulator 5.The input signal is received by the antenna 1, is amplified UHF 2, and then enters the protection block 3, which is a comb of narrow-band channels containing the filter and the detection device interference.Paths that are experiencing interference, locked, resulting in rejections spectrum of the broadband signal affected by interference. Cleared from the interference signal is supplied to the storage device 4, which is memorized its implementation duration T. Memorized implementation is read from the storage device 4 and manipulated in phase in phase arm 5 according to the law of low-frequency SRP generated by the generator 6 SRP. The distorted signal through the delay line 71...7nand the switch 8 is supplied to the power amplifier 11, and then is radiated by the antenna 12. The switch 8 is controlled by the counter 9, which counts the ticks of the clock 10.The switch 8 can be performed on the chip 564 CP1. ZAPADNOGO of signal compression", "Technology communications", vol. 4 series "the Technique of radio", 1982Block protection from interference can be performed as described in U.S. patent N 3986679, H 04 B 1/10, 1976, or as the article Bocca O. F. "Optimal filter characteristics of protection blocks from focusing on the spectrum of interference", "communications Equipment", series "Technique of radio communication", 1987, vol. 4.Let us prove the goal.Let the working transmitter and the transmitter interfering equidistant from the receiver system. Suppose that for synchronization of the receiver at the entrance of his decisive scheme, the signal-to-noise ratio should be no more than 10 dB. Operating the transmitter and the transmitter interference have the same power, the signal-to-noise emitted by the transmitter at the input of the decisive scheme in the absence of noise is 15 dB.Let the catchment area operates narrowband interference in 1000 times the power of the useful signal. This interference will be weakened in former times in the broadband signal, where B is the base of the wideband signal. In the receiving device is provided with a normal mode synchronization and data reception.In the transmitter interference when the signal drops to 1000-fold due to the redistribution of power amplifier in favor of stronger interference.Thus, the signal-to-noise ratio (h) for the relayed interference at the input of the final scheme will be
h = +15 dB to 30 dB << 10 dB
When this synchronization interference becomes impossible.When using the proposed method a part of the spectrum, jammed registereda. With all the power of the power amplifier is spent on the re-emission of only the useful signal, and the power loss due to rejectee range will be F/f = 1/B part (where F is the width of the spectrum of the narrowband interference, f - width of the spectrum of broadband noise). When B = 103power loss due to rejectee is 1/1000-second part, i.e., when using the proposed method in the case of the powerful impact of narrowband interference signal-to-noise ratio for the relayed interference will be h 14 dB > 10 dB. The method involves repeated the implementation of the re-radiation signal. In the case when the transmitted short message, the re-radiation free from interference of implementation can lead to the opposite effect - bringing transmitter interference necessary information to the receiver PSS.To increase the efficiency of interference assumes the introduction of phase manipulation re-radiated by law discocactus the(2)
,k are integers. In the General case k.
Relations (1) and (2) ensure implementation of the terms of the synchronization of the receiver PSS for the interference; the ratio of (3) - distortion received by the receiver PSS information.The radiation of the distorted signal with different delay values increases the likelihood synchronization of a receiver for the relayed interference in cases where the receiver is fixed to the values of the phase reference signal, which is detected action relayed interference with subsequent exclusion of them from the search. In this manner, operation of the receiver, the probability of false synchronization for the relayed interference with the radiation of the distorted signal at n values of the delay is determined by the ratio:
Pn= 1 -(1 - Po)n< / BR>where
Po- the probability of synchronization for interference emission interference with one delay value,
n is the number of delays.Let Po= 0,5; n - 5. Then P5= 1 - (1 - 0,5)5= 1 - 0,03 = 0,97. P5>> Po.Thus, the proposed procedure on signal improves the efficiency of the intentional actions of polowie for synchronization for the interference and reception distorted pseudo law of realization of the signal. The way to create relayed interference resulted in strengthening of the received broadband signal with a duration of elementary character , memorizing its implementation with subsequent repeated his re-radiation, characterized in that after amplification of the received broadband signal and before remembering its implementation rejection parts of the spectrum affected by noise before multiple reradiation memorized implementation purified from broadband interference signal manipulate phase [0,] by law, the low-frequency pseudo-random sequence, the duration of elementary symbol o is determined from the ratio oTpwhere Tpthe time of the search receiver the wideband signal, withochoose a multiple of the duration .m
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.
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.
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.
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.
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.