LT6913B - Method for remote disturbance of electronic equipment - Google Patents

Abstract

A method of remotely interfering with electronic equipment of a target having electronic equipment, comprising generating more than one signal and emitting it through one or more antennas. One or more antennas emit signals of different frequencies that reach the target unchanged and excite non-linear frequency mixing processes in the target electronic components that generate at least one signal which frequency differs from the frequencies of the signals emitted from one or more antennas and corresponds to the operating frequencies of the target electronic equipment.A method of remotely interfering with electronic equipment of a target having electronic equipment, comprising generating more than one signal and emitting it through one or more antennas. One or more antennas emit signals of different frequencies that reach the target unchanged and excite non-linear frequency mixing processes in the target electronic components that generate at least one signal which frequency differs from the frequencies of the signals emitted from one or more antennas and corresponds to the operating frequencies of the target electronic equipment.

Description

TECHNICAL FIELD

The invention relates to the interference of electronic equipment remotely using electromagnetic waves, and more particularly to a method for neutralizing electronic equipment using remote radio signal generation and accurate transmission equipment to a target.

BACKGROUND OF THE INVENTION

The illegal use of unmanned aerial vehicles (BPOs) is a growing public concern. Perhaps the most notable example is the Gatwick airport incident in 2018. Electronic BPO neutralization measures are also used to protect the site from BPO. Their operation is based on the transmission to the BPO of sufficiently powerful radio signals on the frequencies at which the systems using radio communication (navigation, telemetry, control, video transmission, radar) operate to interfere with the operation of these systems. Because these systems operate over a very wide frequency range, several transmitters and several corresponding antennas are commonly used. However, suppression of BPO communication equipment by multi-frequency and / or broadband signals risks affecting other aircraft entering the signal interference area. This is particularly important for satellite navigation (GNSS) systems, which are also used by civilian airplanes. Existing interference systems radiate GNSS frequencies, providing this possibility only minimally - as far as the capabilities of the directional antenna allow.

conventional electronic communication / control remote interference systems emit signals of the frequencies to be interfered with. In order to disturb the control / communication signals, a separate generator and amplifier are required for each frequency signal, and their operating frequencies must coincide with the frequencies used by the electronic system to be disturbed. Such a method is disclosed in U.S. Pat. US10103835, which describes a portable device and method for suppressing control / communication signals of unmanned systems.

U.S. Pat. US10451388B1 discloses a method of neutralizing aircraft using high power energy density pulses. The method allows the generation of extremely strong electric fields at a certain distance from the signal transmission antenna to reach the air penetration limit. Such a strong electric field is enough to destroy any electronic equipment. The main disadvantage of this system is the need for n generators to generate such fields, capable of generating ultra-wideband pulses with a duration not exceeding 1 ns. A very strong and wide signal is also generated, which can also affect the operation of the surrounding electronic devices.

U.S. Pat. US8905176B2 describes a device and method for remotely stopping vehicles using a modulated microwave signal. To reduce the power of the microwave pulses, the device proposes to use a system consisting of a vehicle identification device, a database, a microwave signal modulator and an amplifier to stop the device. Identifying the vehicle type from the data in the database would select the following modulator parameters: microwave frequency (within the L frequency range 1.2-1.7 GHz), amplitude modulation, pulse duration, and repetition rate at which the lowest power of the microwave pulse device is sufficient to stop . The main disadvantage of this method is that, depending on the selected vehicle type, the neutralizing signal is generated in the neutralizing device and can damage not only that specific vehicle but also similar vehicles. A database is also needed to selectively affect certain vehicles.

U.S. Pat. US7865152B2 describes a method and apparatus for remotely neutralizing electronic devices using microwave signals. The device consists of two microwave signal generators generating different frequencies. These two different signals are fed to an antenna where they are summed together: the unmodulated signal of one frequency is combined with the unmodulated signal of the other frequency, thus giving the common signal amplitude modulation with a suppressed carrier without the use of a mixer or modulator. The main disadvantage of this method is that the interaction of these two signals results in a modulated, pre-prepared control / communication frequency pulse of the electronic devices at the output of the antenna, which does not selectively neutralize the target. The invention does not have the above-mentioned drawbacks associated with the wide width of the neutralization signal beam of the electronic equipment and the non-selective exposure of the targets.

SUMMARY OF THE INVENTION

The invention discloses the remote neutralization of electronic devices, in particular electronic devices for aircraft or other vehicles, by electromagnetic waves. The method comprises using at least two signal generators and supplying such generated signals to the antenna. The signals are selected according to the laws of generating additional frequencies in nonlinear circuits. Second and higher order nonlinearity can be used. Two or more frequencies may be used.

The frequencies of the interference signals are selected to take into account the following criteria:

• Frequencies with unwanted radiation.

• Possibility to realize additional spatial selection using nonlinear effects.

• Frequencies at which direct (interfering with the frequencies exposed to electronic equipment) interference is desired.

• Frequency bands where direct interference and interference with non-linearity are possible.

• Frequencies or frequency bands where interference is required.

• The higher the sequence nonlinearity is used, the weaker the signal will be generated in the nonlinear elements.

By selecting the frequencies of the radiated signals, we may interfere with the communication equipment without radiating the operating frequencies of that equipment. This avoids unnecessary interference to other communication / control equipment around the radiation source. The generated signals are of different frequencies and remain so until the target. Upon reaching the target, the signals in the semiconductor components of electronic devices, which are characterized by the phenomenon of nonlinearity (when the voltage and current do not vary according to the linear law of Ohm), induce nonlinear frequency mixing processes. Such processes are: harmonic generation, total / differential frequency generation, etc. In this way, signals of additional frequencies that are different from the frequencies of the original signals are obtained. Signals are generated! in the very electronic circuit of the device that we seek to influence. Since the generation of additional frequencies is based on the effects of nonlinearity, knowing the operating frequencies of the device, we can select the frequencies of external signals so that the signals generated in nonlinear elements correspond to the operating frequencies of the device.

The method also includes emitting spectral interference signals at a narrow angle, emitting at least two frequency bands at high frequencies.

BRIEF DESCRIPTION OF THE DRAWINGS

Features of the invention which are new and obvious are set forth in the appended claims. However, the invention may be best understood from the following detailed description of the invention, in which, without limiting the scope of the invention, exemplary embodiments of the invention are given with reference to the accompanying drawings, in which:

fig. shows the generation of additional frequencies in electronic equipment having nonlinear (when the voltage and current do not vary according to the linear law of Ohm) elements (diodes, transistors) when the electronic equipment is exposed to at least two signals of different frequencies. Green shows the second to fifth rows of nonlinearity generated signals. The two colors emitted by the two frequencies are shown in red. Additional frequencies could be a source of interference to communication navigation or other electronic equipment.

fig. is a schematic diagram of the method for interference of an unmanned aerial vehicle communication system with external electromagnetic radiation of different frequencies.

fig. a graph is shown showing the change in the number of frequencies generated due to the nonlinearity effect when the device is irradiated with two and three frequencies of external radiation. The amplitudes shown are for illustrative purposes only, the amplitudes actually generated may differ from those shown in the figure.

fig. shows a specific case of electronic communication (Wi-Fi and telemetry) and GNSS navigation equipment interference, combining direct interference (Wi-Fi equipment interference) and interference using second (0.4 GHz telemetry equipment interference) and third order (GNSS equipment interference) nonlinearities .

fig. a schematic diagram is shown where one of the signals generated is broadband and the other is narrowband. Due to the interaction of these two signals, the signal generated in the nonlinear element is also broadband.

fig. is a schematic diagram of when two narrowband signals are generated. Their frequencies are changed synchronously in such a way that the signal generated by the nonlinear element is in phase modulation and the signal spectrum is of the desired width.

The most preferred embodiments of the invention are described below with reference to the drawings. Each image has the same numbering for the same or equivalent item.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

It is to be understood that many specific details are set forth in order to provide a complete and straightforward description of an exemplary embodiment of the invention. However, it will be apparent to one skilled in the art that the details of the examples of embodiments of the invention are not limited to the practice of the invention, which may be practiced without such specific instructions. Well-known methods, procedures, and components have not been described in detail so as to avoid misleading examples of the practice of the invention. Furthermore, this description should not be construed as limiting the examples of implementation provided, but only as an implementation thereof.

Although examples of embodiments of the invention, or aspects thereof, as shown and described, include many components that are depicted to be in a particular common space or location, some of the components may be remote. It should also be understood that the examples provided are not limited to the components described and include other elements necessary for their operation and interaction with other components, the presence of which is self-evident and therefore not detailed.

Labeling of items: ".... number.n", indicates the item from the specified minimum to the largest.

The method according to the invention is intended to remotely interfere with the operation of electronic equipment in a wide frequency range by emitting relatively narrow high frequency signals in a narrow beam. The method involves the use of at least two remote signal interference systems with different frequency signal sources (2.1, 2.2, ... 2.n) to generate at least two different frequency interference signals f2.i, f2.2, ... f2.n (1.1, 1.2, ... 1.n). The generated interference signals (1.1, 1.2, ... 1.n) are sent to at least one antenna (3.1, 3.2, ... 3.n), which is preferably directional, for emitting said signals to the target (4). The interference signals (1.1, 1.2, ... 1.n) reach the target (4) essentially unchanged (except for the reduced amplitude due to the loss of natural propagation of electromagnetic waves in space).

By using a single antenna (3.1) to radiate all signals to the target (4), a more compact interference system can be obtained. Using separate antennas (3.1, 3.2, .. 3, n) for each signal of different frequencies f2.i, f2.2, ... f2.n (1.1, 1.2, ... 1.n) would make the interference system larger , compared to a single antenna system (3.1), but more than one antenna system (3.1, 3.2, ... 3.n) should not provide isolation between different transmitters (2.1,2.2, ... 2.n). Isolation between two transmitters (2.1, 2.2) in a single antenna system (3.1) can be realized by using different signal polarizations or by using frequency filters. When three or more different interference signals (1.1, 1.2, 1.3,, .. 1.n) interact with nonlinear elements (5), the frequencies fi.i, fi of the generated signals (6.1, 6.2, ... 6.n) increase. .2 ... fi.n number in nonlinear elements (5).

A target (4), such as an unmanned or manned aircraft, that has reached two or more different frequencies for signals f2.i, f2.2, ... f2.n (1.1, 1.2, ... 1.n) in the electronic equipment elements (5), due to the nonlinearity of their volt-ampere characteristic, the differential / sum and combined frequencies of the signals (6.1, 6.2, ... 6.n) are generated fi.i, fi.2 ... fi.n. The irradiated electronic equipment of the target (4) receives a wide range of signals (6.1,6.2 ... 6.n) that can cause interference to communication equipment operating in various frequency bands. By selecting the frequencies f2.i, f2.2, ... f2.n of the radiated signals (1.1, 1.2, ... 1.n), we can disturb the communication / control equipment without emitting the signals (6.1, 6.2, ... 6. n) with a frequency fu, fi.2, ... fi.n corresponding to the frequencies fu, fi, 2 ... fi.n of the operation signals of the communication / control equipment of that equipment. When using higher frequency interference signals (1.1, 1.2, ... 1.n), the directivity of antennas of the same width (3.1, 3.2 ... 3.n) will be higher than in the case of lower radiated frequencies. In this way, the target (4) is even better separated in space. This further improves the separation of targets in space: other surrounding objects remain unaffected by interfering radiation. This is particularly the case for GNSS systems, which are used by many users on the ground and in the air, including airliners. Using a higher frequency, such as several GHz, we can concentrate the radiating energy into a much narrower beam than using hundreds of MHz sequential frequencies (with an antenna of the same size).

The use of the frequencies fzi, f2.2, ... f2.n of two or more interference signals (1.1, 1.2, ... 1, n) allows a freer choice of the frequencies of the radiated interference signals (1.1, 1.2, ... 1.n) f2.i, f2.2, ... f2.n, thus avoiding important critical frequencies where signal interference around the target is undesirable. The interference signals (1.1, 1.2, ... 1.n) are selected according to the laws of generating additional frequencies fi.i, ... fi.n in nonlinear circuits. Second and higher order nonlinearity can be used.

The following criteria must be taken into account when selecting the frequencies of interference signals:

• Frequencies with unwanted radiation.

• Possibility to realize additional spatial selection using nonlinear effects.

• Frequencies at which direct (interfering with the frequencies exposed to electronic equipment) interference is desired.

• Frequency bands where direct interference and interference with non-linearity are possible.

• Frequencies or frequency bands where interference is required.

• The higher the sequence nonlinearity is used, the weaker the signal will be generated in the nonlinear elements.

Frequency selection method:

In one embodiment of the invention, in order to generate one interference signal (6.1) in the electronic components (5) of the communication / control system of the target (4), the frequency fi.i corresponding to the frequency fu of the communication / control system operation in the first and second signal the generators (2.1, 2.2) generate signals of different frequencies f2.i, f2.2 (1.1, 1.2). Such signals (1.1, 1.2) are sent to the target (4) via the antenna (3.1) or antennas (3.1, 3.2, ... 3.n) and reach the unchanged spectrum of the electronic components (5) of its communication / control system, where second and third order nonlinear effects are generated second or third order harmonics, respectively. Knowing the frequency fi.-i of the electronic equipment operation signal (6.1) to be suppressed, the frequencies f2.i, f2.2 of the signals (1.1, 1.2) generated by the generators (2.1, 2.2) are selected.

The generation of harmonics in the electronic equipment of the target (4) is described by the formula (7):

/2.1/2.2 = į- ( ⁷ ) where m - is the sequence of the generated harmonic. In this case, the frequencies fzi or f2.2 will be two or more times lower than f 1.1, so better spatial selection will not be realized.

To take advantage of the second-order nonlinearity, we choose the frequencies fi.i and f2.i so that Equation (8) is satisfied:

/1.1 I / 2.I i / 2.2I (θ)

The case of the combined frequencies f2.i and /2.2 means that both of these frequencies will be lower than fi.i, so it would not be possible to obtain a narrower beam (better spatial selection) using a fixed-width antenna. The case for better spatial selection would correspond to equation (9):

Λ.ι - I / 2.2 ~ /2.11 (9)

In this case, f2.1 and f2.2 may be significantly higher than f 1.1.

In the general case, the frequencies f2.2 and f2.i can be very different, but in practice there may be frequencies where extraneous radiation may be particularly undesirable, but due to the ambiguous dependence of f1.1 on f2.1 and f2.2, it is possible to avoid radiation at those unwanted frequencies.

In another embodiment of the invention, in order to disturb a communication / control system operating on signals of more than one frequency fi.i, fi.2 ... fi.n, one interference signal (1.3) generated is of the same frequency f2.i as one of the operating frequencies fi.2 of the communication / control system, i.e. is a direct interference signal. The frequency f2.2 of the other radiated interference signal (1.4) differs from the frequency f2.i of the direct interference signal (1.3) and from any other operating frequency fu, fi, 2 ... fi.n of the communication / control system. The frequency f2.2 of the said other radiated interference signal (1.4) is chosen according to formula (10):

/2.2 = I / 2.1 ± A.J 0 °)

The amount or difference in the formula is selected taking into account the above criteria - spatial selection and the presence of frequencies where interference is highly undesirable.

In the above case, a situation may arise where direct interference at frequency f2.1 is desired in a wide frequency range and the frequency range in f 1.1 is narrow. If, according to formula (9), the frequency f2.2 is a narrowband (carrier only) signal and f2.i is a broadband signal, then f 1.1 will be the same broadband as f2.1, which may be undesirable because the interference efficiency will be reduced. To solve this problem, direct interference in the wide frequency range can be performed by rapidly changing the frequency of the narrowband signal f2.1 in the wide frequency range, thus providing direct interference and simultaneously changing the frequency f2.2 according to the formula (10). In this case, the frequency f2.2 will not change, but, depending on the rate of change of the frequencies f2.1 and f2.2, the spectrum of f 1.1 will expand due to the resulting phase modulation. By varying the rate of change of the frequencies f2.1 and f2.2, the spectrum of the desired width f1.1 can be obtained.

To generate the suppressed frequency using the third-order nonlinearity, we can use the formulas (11,12):

/1.1 = 2 / ^ - / 2.2 (11) / ii = _2/2 . _2/2 .i ( ₁₂ )

By using the same principles as in the case of second-order nonlinearity, unwanted interference frequencies can be avoided and direct interference can be realized at the same time.

When f ₂ . ₂ > f ₂ , i is better to use formula (11) because in this case fu will be less than fzi and f ₂ . ₂ , so the radius of the transmitted signal can be narrowed.

Using three different generators and to generate the frequency arising from the second-order nonlinearity, the frequency fi.i generated in the nonlinear elements can be found by Equation (13):

/1.1 = | / ₂ .i ± fi.į h kai it j (13)

Given that there may be situations where three generators will be used to interfere with the electronics, the frequencies f2.i, f2 _.2 and f2.3 generated by them shall satisfy the following condition (14):

/1.1 = /2.1 + fz.j ± f ₂ .k> kai i, j Φ k, (14) where /; / k = 1; 2; 3 is the frequency generated by the generators (2.1, 2.2, ... 2.n), fi.1 is the frequency of the third order nonlinearity due to the three external frequencies.

Other examples of the implementation of the invention:

The standard way of interfering with and interfering with aircraft electronic equipment, and especially communications equipment, is to send interference to GNSS and control system frequencies and thus block BPO navigation and control systems.

The transmission of interference on GNSS frequencies in the airport area is completely unacceptable, as GNSS systems are used by civil aircraft. According to an embodiment of the invention and as shown in Figure 4, radio beams (1.5, 1.6) with frequencies of 2 GHz and 2.4 GHz are directed to the aircraft. In the communication electronic components (5) of the target (4), a signal (6.3) is generated, the frequency of which blocks the control or telemetry frequency of the target (4) at a frequency of 400MHz (second order nonlinearity 2.4-2 = 0.4 GHz). The 1.6 GHz GNSS signal is also blocked (third order nonlinearity 2x2-2.4 = 1.6 GHz) and the control and telemetry range of the 2.4 GHz target (4) is directly blocked. As the GNSS signal is not radiated, this avoids unwanted interference with the GNSS navigation system for passenger aircraft and surrounding users. Appropriate modulation of the radiated signals should be selected for maximum interference efficiency.

In another embodiment of the invention, the selectable frequencies of the external signals (1.7,1.8) are f2.3 = 2.0GHz and fz4 = 2.4 GHz. When such signals (1.7, 1.8) affect the nonlinear element (5), it generates additional signals fi, ₃ = 0.4 GHz (second order nonlinearity) and fi.4 = 1.6 GHz (third order nonlinearity 2x2 GHz - 2.4 GHz = 1.6 GHz). (6.3, 6.4). The 1.6 GHz frequency is approximately the L1 frequency range for GNSS systems. This is particularly the case for the GNSS system, which is used by many users on the ground and in the air, including airliners.

In order to suppress Wi-Fi and GNSS frequencies, we are facing a problem - the Wi-Fi range is wide - about 100 MHz, and GNSS - narrow - about 1 MHz. Using a broadband (say, 100 MHz bandwidth) 2.4 GHz signal (1.10) and a monochrome 2 GHz signal - the response generated in nonlinear elements will be broadband, reducing the GNSS interference efficiency. To solve this problem, a narrowband but variable frequency (within 100 MHz) signal should be used to interfere with the 2.4 GHz Wi-Fi band. Frequent hopping within 100 MHz can suppress signals over the entire Wi-Fi range. If the frequency of one of the two signals changes, the frequency of the nonlinear response will also change, so we have to change the frequencies of both signals synchronously so that we get the required nonlinear response frequency. The required GNSS or other interfering signal spectrum can be obtained by modulating one of the two frequencies or (and) changing the rate of frequency change (jump). The higher the jump speed, the wider the range.

In yet another embodiment of the invention, one or more interference signals (1.1, 1.2, ... 1.n) of different frequencies fa.i, f2.2, ... f2.n are generated in a non-electronic equipment remote interference system having only or more signal generators (2.1, 2.2) and other devices, such as nearby radio or television broadcasting stations, radars and other sources of strong radio signal, in signal generators (2.3, ... 2.n) whose signals are emitted through the antennas (3.3, ... 3.n) and reaches the target (4). In this case, knowing the frequency of the signals fz.i, f2.2, ... f2.n (1.1, 1.2, ... 1.n) reaching the target (4) in an electronic interference system with one or more signals the generator (2.1, 2.2) generates one or more additional signals, the frequencies of which are appropriate for the electronic equipment elements (5) of the target (4), due to the nonlinearity of their volt-ampere characteristics, the generated interference frequency frequencies fi.i, fi.2. ..fi.n differential / total and combination signals (6.1, 6.2, ... 6.n). The characteristics of the interference signals are calculated in the same way as above, according to formulas (7) to (14).

Although many features and advantages have been listed in the description of the invention, together with the structural details and features of the invention, the description is given by way of example. Modifications may be made in the details, in particular in the shape, size and arrangement of the materials, without departing from the principles of the invention, in accordance with the most widely understood meanings of the terms used in the claims.

Claims (14)

A method of remotely interfering with electronic equipment of a target (4) having electronic equipment, comprising generating and emitting more than one signal (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10 ... 1.n) one or more antennas (3.1, 3.2, ... 3.n) are characterized in that one or more antennas (3.1, 3.2, 3.3 ... 3.n) emit different frequencies f2.1, f2.2 , f2.3, f2.4 ... f2.n signals (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10 ... 1.n) that reach the target (4) unchanged and the electronic components (5) of the target (4) excite nonlinear frequency mixing processes that generate at least one signal (6.1, 6.2, 6.3, 6.4, ... 6.n) having a frequency of f1.1, f1.2, f1. 3, f1.4, ... f1.n differs from the frequencies f2 of the signals emitted by one or more antennas (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10 ... 1.n) .1, f2.2, f2.3, f2.4, ... f2.n and corresponding to the operating frequencies f1.1, f1.2, f1.3, f1.4, ... of the target (4) electronic equipment. f1.n. The method according to claim 1, wherein the electronic components (5) of the target (4) have an excited harmonic according to the formula (7): where m is the sequence of the harmonics generated, f1.1 is the frequency of the signal generated by the target electronics (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2, 2.3). The method of claim 2, wherein the damping frequency f1.1 is generated using second order nonlinearity. The method according to claim 3, wherein the signals (1.1, 1.2) emitted at different frequencies f2.1, f2.2 comprise frequencies f2.1, f2.2 satisfying equation (8): where f1.1 is the frequency of the signal (6.1) generated by the target electronic components (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2, 2.3). The method according to claim 3, wherein the signals (1.1, 1.2) emitted at different frequencies f2.1, f2.2 comprise frequencies f2, f3 satisfying equation (9): where f1.1 is the frequency of the signal (6.1) generated by the target electronic components (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2, 2.3). The method according to claim 3, wherein the frequency f1.1 generated in the electronic components (5) of the target (4) can be found according to equation (13): oi, j = 1, 2, where f1.1 is the frequency of the signal generated by the target electronic components (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2, 2.3). A method according to any one of claims 1 to 5, wherein one or more of the frequencies f2.1 of the emitted signals (1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10 ... 1.n), f2.2, f2.3, f2.4, ... f2.n is the same as the operating frequency f1.1 of the target (4) electronic equipment and two or more of the emitted signals (1.1, 1.2, 1.3, 1.4 , 1.5, 1.6, 1.7, 1.8, 1.9, 1.10 ... 1.n) frequencies f2.1, f2.2, f2.3, f2.4, ... f2.n differ from the target (4) electronic equipment operating frequency f1.1, f1.2, f1.3, f1.4, ... f1.n. The method of claim 7, wherein one of the radiated frequencies f2.1 is a direct interference frequency and the other radiated frequency f2.2 has values according to formula (10): where f2.2 is the frequency of the signal generated by the target electronic components (5) (f), f2.1 is the direct interference frequency generated by the first external generator (2.1), f1.1 is the interference frequency generated by the target electronic components (5). The method of claim 2, wherein the damping frequency f1.1 is generated using third order nonlinearity. The method according to claim 9, wherein the signals (1.1, 1.2) emitted at different frequencies f2.1, f2.2 comprise frequencies f2.1, f2.2 satisfying equation (11): where f1.1 is the frequency of the signal (6.1) generated by the target electronic components (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2). The method according to claim 9, wherein the signals (1.1, 1.2) emitted at different frequencies f2.1, f2.2 comprise frequencies f2.1, f2.2 satisfying equation (12): where f1.1 is the frequency of the signal (6.1) generated by the target electronic components (5), f2.1 and f2.2 are the frequencies generated by the first and second external generators (2.1, 2.2). The method according to claim 9, wherein the frequency f1.1 generated in the electronic components (5) of the target (4) can be found according to equation (14): where i; j; k = 1; 2; 3 is the frequency generated by the generators (2.1, 2.2, 2.3), f1.1 is the frequency of the third order nonlinearity due to the three external frequencies. A method according to any preceding claim, wherein the signal spectrum of the generated signal in the nonlinear elements is obtained due to the phase modulation occurring synchronously by varying the frequencies of the radiated signals at a certain rate. A method according to any preceding claim, wherein the signal spectrum of the generated signal in the nonlinear elements is obtained from the signals generated by the generators (2.1, 2.2, ... 2.n) at frequencies f2.1, f2.2, f2.3, f2.4, ... f2.n modulation.