The device radiometeric

 

The invention relates to electrical engineering and can be used in the field of active electronic masking electromagnetic radiation. Achievable technical result - the creation of induced masking noise. The device radiometeric contains two connected generator, the coupling element, the splitter with one input and N outputs, N buffer stages and N emitters. 5 Il.

The invention relates to radio engineering, and specifically to the field of active electronic masking stray electromagnetic emissions and interference (pre) computer equipment (foreign synonyms: TEMPEGT, compromising emanations "compromising radiation").

Range of side information of the radiation and interference of modern computers and peripherals, occupies a frequency range from a few kHz to 1000 MHz. In this same frequency range can receive the pre at a distance of several hundred meters and full recovery is handled by the computer information [1]. Therefore, to protect confidential information from unauthorized access, you must use technical means of preventing the information side of the electromagnetic radiation is considerable technique. However, the use of shielding does not provide sufficient protection information channel interference informative signal on the outgoing circuits and systems, and the cost of screening is high enough.

It is known device [2] , which is designed to protect the information by concealment of pre Informatics and computing. The protection device comprises a generator of random signals and connected to its output antenna. A distinctive characteristic of this device is that the antenna is made in the form of a segment of the radiating radio frequency transmission line, which can be applied radio frequency radiating cable, two-wire line or a single wire. A significant disadvantage of this device is high irregularity spectral density of the masking signal.

However, the known noise generator of [3], containing within the enclosure-screen, first and second interconnected oscillators, first and second asymmetric strip line NPL and the first capacitor, and a third NPL, second and third capacitors, the first, second and third resistors, with each oscillator has two transistors on dvuhmatchevyh transistors of the first and second oscillators are connected in pairs and connected to the initial part of the first NPL, the collectors of the transistors of the first and second oscillator connected to the primary sections respectively of the second and third NPL, the ends of the second and third NPL connected via a second resistor connected to the positive input of a power source, connected through a third resistor with a first end NPL, a first capacitor connected between the second and third NPL, second and third capacitors connected between the first and third NPL. This invention is intended to protect computer equipment against leakage of information on the channel side of electromagnetic radiation, however, questions of formation of the masking signal in the exhaust circuit is not considered, which limits the applicability of this invention.

Known devices closest to the technical essence is the device radiometeric [4]. The device includes a noise generator and emitter. The noise generator is made in the form of a system of two generators, the first of them is the oscillator with delayed feedback and inertial automasinam, and the second variable feedback, the connection between the generator is carried out using a coupling element, and the emitter is connected to the output of the noise generator.

Defects in vodnykh communication lines and other utilities.

The technical task to be solved by the invention is to improve the efficiency of the device radiometeric by creating induced masking noise in the power supply circuits, grounding, engineering communications, and lines auxiliary technical means of communication, including telephone lines and fire alarm systems.

For this purpose the device radiometeric containing the noise generator in the form of a system of two coupled oscillators, the first one is the oscillator with delayed feedback and inertial automasinam, the second generator with adjustable feedback, the output of the first generator is connected to the input of the second generator with the help of coupling element, and the emitter included splitter with one input and N outputs, N buffer cascades, made in the form of amplifiers with the inertial automasinam and (N-1) additional emitters, while the output of the noise generator connected to the input of the splitter, each output of the latter is connected to the input of the corresponding buffer stage, and the input of each emitter is associated with a corresponding output buffer stage.

As illustrative material represented by the following drawings: the fir on the basis of "related" lines, b) emitter type "solenoid") - loop antenna; Fig. 3 is a spectrogram of the output oscillations: (a) the noise generator, b) - buffer cascade; Fig.4 is an electric diagram of the device is implementation-specific; Fig.5 - level masking and informative signals.

The device radiometeric (Fig.1) contains the noise generator 1, the output of which is connected to the input of the coupler 2 having one input and N outputs, N buffer stages 3, the inputs of which are connected to respective outputs of the coupler and N emitters 4, connected to the outputs of the respective buffer stages. (The number of buffer stages and the emitters is determined based on the quantity (number) of possible channels of information leakage on air, power supply circuits, grounding, telephony, security systems, utilities, and so on). To each buffer to the cascade connection of the two emitters.

The noise generator 1 consists of a system of two coupled oscillators. The first generator includes a nonlinear amplifier 5 with the inertial automasinam 7, a chain of delayed feedback 6 delay signal at time T. the Second generator comprises a nonlinear amplifier 8 and adjustable chain delayed feedback 9. The output of the first GE the battle of the transmission line with taps on the number of buffer stages. The input impedance of the coupler aligned with the output impedance of the noise generator, and the output - input impedance buffer cascades.

Buffer cascades 3 are identical amplifiers 11 to inertial automasinam 12 and provide additional non-linear transformation and amplification in the transmission channel noise signal to the emitters 4 different types (13 and 14), and also perform the function of the decoupling element, eliminating the influence of the load (emitters) on the mode of operation of the noise generator.

To ensure full radiometeric pre using one antenna is not possible. It is therefore proposed to use the emitters of different types [5]: - for the formation of the masking signals in the power supply network and other communications (Fig.2A, b); - for the formation of the electromagnetic field of the mask signal in space (Fig.2B).

1. Strip heaters on the basis of "related" lines for guidance masking signal in wire line, electric and telephone networks, lines of fire and burglar alarms, as well as guidance masking signal in utilities.

2. The emitters of the type "solenoid" for guidance mainly nishchay antenna magnetic type for forming an electromagnetic field noise in space. This dish creates a fairly uniform electromagnetic field in all directions in the conditions of the confined space, and the emissivity of the antenna is only weakly dependent on frequency, which eliminates the frequency filtering of the emitted signal.

Depending on the technical equipment used at the facility Informatization (system units, monitors, printers, scanners, off the chain, network equipment) and set the number of emitters device radiometeric may be different, and in some cases will be determined by the results of on-site measurements of the spectral levels of pre.

The device operates as follows.

The noise generator 1 generates broadband noise signal. The principle of operation of the noise generator is based on the phenomenon of dynamical chaos [6-8] and in this case, in the system of two coupled oscillators with delay and lag is non-linear interaction of two complex oscillatory processes with netvigilance arrangement of natural frequencies and their harmonics. The first generator generates a multi-frequency oscillations in accordance with the signal delay T in the feedback circuit 6 (

At the same time in the first generator is an additional nonlinear conversion of a signal using inertial avtomashine 7. The condition for the realization of inertial avtomashine is quite certain ratio constant times of charge and discharge of a reactive element in the chain,charge <discharge [9]. In this case, the control voltage produced by the circuit avtomashine will be determined by the amplitude of the previous oscillation, i.e. the position of the working point, and the gain of the nonlinear amplifier 5 will change from crawl to crawl signal chain delayed feedback 7. As in the generator, resulting in the propagation of the Raman components are chaotic oscillations, the circuit avtomashine also produces chaotic low-frequency control voltage which is fed to the input of the generator and varies randomly position the operating point of the nonlinear amplifier, which leads to an additional modulation of the resulting signal, and the oscillation spectrum extends into the region of low frequencies. As a result of implementation of the considered processes, the energy spectrum of the fluctuations Stonewater contains nonlinear active element 8 and the chain is adjustable delayed feedback 9 and works in external triggering mode from the first generator. It enriches the spectrum of oscillations of a system of coupled with additional components, that is, creates a second "grid" natural frequencies with netvigilance arrangement of the components relative to the first generator. The interaction of oscillations of the first and second generators provides a process of forming the chaotic result of fluctuations of the noise generator (Fig.3A).

The output signal from the noise generator is fed to splitter 2, which is divided into N channels.

With each output of the splitter, the signal at the input of the corresponding amplifier 11 buffer cascade 3, where is the gain, as well as additional non-linear transform of the noise signal due to the inertial avtomashine 12. The ratio of the time constant of the specified chain and chain inertial avtomashine noise generator 7 should be nonmultiple and to vary at least 15-20%. As a result, the unevenness of the spectral density of the noise signal at the output of buffer cascade decreases (Fig.3b). Gain buffer stages should not be quantitatively less than the number of channels N (Ky> N).

Output buffer stages, the signal at the emitters 4. The emitter 13 (Fig. 2B) POPs the noise masking signal to the power grid, telephony and other communications.

The electric circuit device specific implementation, developed in accordance with this invention is shown in Fig.4.

The noise generator 1 contains two related generator, which is performed on the transistors VT1 and VT2, the chain of delayed feedback of the first generator on the elements L1, C1, chain inertial avtomashine on the elements R3, C2, and adjustable delayed feedback of the second generator is performed on the elements C4, L3, L4. The relationship between the first and second generators is provided by capacitor C3.

Splitter 2 is made on the basis of microstrip transmission lines and has one input and 5 outputs.

Buffer cascades 3 are identical amplifier modules based transistors VT3 and VT4, their gain is about 10 dB. Chain inertial avtomashine amplifiers buffer stages performed on the elements of C9, R10.

The device radiometeric has two types of antennas: - single-turn coil antenna WA1 magnetic type for forming an electromagnetic field noise in space. The diameter of the antenna ~0.6 m (Fig.2B).

four strip emitter WM1 on the basis of "related" lines for guidance Masi, and guidance masking signal in engineering communication. A sketch of such a strip emitter shown in Fig.2A.

Device radiometeric control circuit is provided power supply, monitor the health of the device, the output of which is selected Executive item, allowing you to block the operation of electronic computer equipment in case of malfunction of radiometeric. The power supply device radiometeric is supplied from a stabilized DC voltage of 12V DC.

The device radiometeric may be made in the form of a structurally Autonomous unit, and a unified Board, installed in a free slot of the system unit of the computer.

Measurement of the levels of induced noise masking signal conductive lines, electric and telephone networks, lines of fire and burglar alarms, communications engineering, made using selective microvoltmeter SMV-6.5 and SMV-8,5 showed that the noise signal significantly exceeds the levels informative interference on specified circuit over the entire frequency range and provides reliable masking (Fig. 5A).

Measurement spectral is C, made using selective microvoltmeter SMV-6.5 and SMV-8,5 showed that over the entire frequency range of informative radiation means computing the intensity of the mask signal is greater than the intensity of natural electromagnetic radiation basic computer equipment (printer, monitor, SVGA, VGA, plotter) and provides reliable masking and protection of information processed (Fig.5B).

Entropic quality factor of the mask signal generated by the device radiometeric as conductive lines, electric and telephone networks, lines of fire and burglar alarms, communications engineering, and space, as measured by the instrument X6-5 amounted to a value of not less than 0.95, which satisfies the requirements for such devices requirements. Vnutrepenialnye communication in masking the signal within each channel and between channels is not detected.

In comparison with the prototype, the device radiometeric developed in accordance with this invention, provides comprehensive protection of information from leakage through side channels of electromagnetic radiation and interference from computer equipment.

Currently the formation.

Sources of information 1. WIM van Eyck. Electromagnetic radiation videodisplay modules: risk of interception of information / Protection of information a Fiduciary, 2001, 1, 2.

2. Alexandrov Y. S., Veryovkin Century A. the Application for the invention 94007674/09 from 01.03.1994. The protection device is complex distributed Informatics, computer technology and physical environment. Publ. 27.10.1995.

3. Kadiev A. M. Fadeev , N. M. Generator noise signals. RF patent 2097906, publ. 27.11.1997.

4. Bezrukov C. A., Ivanov, B. N., Kalashnikov B. C., Lebedev M. The device radiometeric. RF patent 2170493, publ. 10.07.2001.

5. Agricultural Meinke, F. C. Gundlach. Antenna. The propagation of radio waves. TRANS. with it. - M.: Gosenergoizdat, 1961, 528 S.

6. Rabinovich, M. I., Trubetskov D. I. introduction to theory of oscillations and waves. - M.: Nauka, 1984, 432 S.

7. Edited Akulenko L. D. TIER. Thematic issue. Chaotic systems. - M.: Mir, 1987, T. 75, 8.

8. Lebedev, M. N., Ivanov, B. N. Oscillators with chaotic dynamics. Instruments and experimental techniques. - M.: Nauka, 2002, 2, S. 94.

9. Sudakov Y. I. Amplitude modulation and automodulation transistor generators (theory and calculation). - M.: Energy, 1969, 392 S.


Claims

The device radiometeric containing the gene of delayed feedback and inertial automasinam, and the second is made with controlled feedback, and the output of the first generator connected to the input of the second element, and the emitter, characterized in that it introduced a splitter with one input and N outputs, N buffer cascades, made in the form of amplifiers with the inertial automasinam and (N-1) additional emitters, while the output of the noise generator is connected to the input of the splitter, each output of the latter is connected to the input of the corresponding buffer stage, and the input of each emitter is associated with a corresponding output buffer stage.

 

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