Method for normalization of composite phase-manipulated signal

FIELD: radio engineering, applicable in antiference radiolinks.

SUBSTANCE: the method is featured by the fact that the pseudorandom sequence with clock pulse fp and for expansion of the spectrum is divided into two orthogonal sequences, one of which contains only even harmonics of the initial pseudorandom sequence, and the other - only the odd ones, then each of the obtained sequence is multiplied with a simple phase-manipulated signal, then the upper side band is separated from the spectrum of one obtained signal, and the lower side band - from the spectrum of the other signal, these unlike side bands are summed up, in each side band two narrow sections of the spectrum symmetrical relative to frequency f0+1/2fp, in the upper side band and relative to frequency f0-1/2fp in the lower side band, one of the separated sections of the spectrum in each side band of the separated spectrum sections is amplified to the known magnitude, and the other, symmetrical to it, is inverted, after which the separated and remained non-separated sections of the spectrum in both side bands are summed up, the separated narrow spectrum sections in each side band are altered according to the pseudorandom law.

EFFECT: enhanced anti-interference of the radiolink is attained due to the fact that in the method of normalization of the composite phase-manipulated signal consists in expansion of the spectrum of the simple phase-manipulated signal obtained by multiplication of the carrying sinusoidal oscillation with frequency f0 and the binary information signal.

6 dwg

 

The present invention relates to the field of radio and can be used in antijamming radio links.

It is known that increasing the noise immunity of links is achieved through stealth transmission, and at the expense of noise immunity reception. Discretion determines the probability of detection of the signal, its identification (accessory), the evaluation of parameters, the type and effectiveness of organized noise.

Therefore, when selecting the type of signal to noise radio links need to predict (to provide) the opponent's actions for exploration and radio-electronic suppression.

For electronic countermeasures are typically used barrage and sighting frequency interference. If the barrier obstacle has a sufficiently large capacity, it is able to suppress both broadband and narrowband signals. However, the production of defensive interference is possible and expedient is not always as it suppresses its radio operating in this frequency range. In addition, for setting an effective barrier interference requires a high power transmitter. In these conditions, to suppress narrowband signal or a signal with a slow pseudo-random rearrangement of the operating frequency (frequency hopping) opponent most likely will put sighting frequency interference than loading the long-term success.

Widely used in modern antijamming radio links are signals with frequency hopping. However, they have low energy reserve. Higher energy subtlety provide complex photomanipulation signals (SFMS), a formation method which are described in the book (Lehrerin. Communication systems with noise-like signals. - M.: Radio and communication, 1985, page 16, Fig. 1.7), adopted for the prototype.

The essence of the prototype method is to expand the range of simple photomanipulating signal (FMS), is obtained by multiplying the carrier sinusoidal oscillations with frequency foand the binary signal information. Expansion of the spectrum is done by simple multiplication Fmns and a pseudo-random sequence (SRP) with a clock frequency ft.

The way the prototype is implemented in the device, a functional diagram of which is shown in figure 1, where indicated:

1 - generator rotor oscillations;

21, 22the multiplier products;

3 - generator SRP.

But is formed in such a way SFMS has insufficient structural secrecy. Indeed, during the construction of such a signal in a square formed of discrete spectral lines at frequencies of:

f=0; ft; 2fabout; 2fo±ft,

where fabout- frequency carrier oscillation;

ft- tick the I frequency of the SRP.

The appearance of spectral lines at frequencies 2fabout, 2fabout±ftthat is the main discloses a symptom of binary SFMS, facilitates its detection, identification and estimation of parameters.

The formation of these spectral lines due to the symmetry of the phase spectrum SFMS relative frequency faboutand fabout±1/2ft(figure 2), which can be written as

ϕ(f-fabout)=-ϕ(fabout-f)

ϕ(f-fo±1/2ft)=-ϕ(fo±1/2ft-f)

When squaring formed works of frequency components:

- upper and lower side bands, which give a spectral line at the frequency 2fabout;

- bands (fo-fo+1/2ft) and (fo+1/2ft-fo+ft), which give a spectral line at the frequency 2fo+ft;

- bands (fo-ft-fabout-1/2ft) and (fabout-1/2ft-fo), which give a spectral line at the frequency 2fo-ft;

- bands (fo-ft-fabout-1/2ft) and (fo-fo+1/2ft), and (fabout-1/2ft-fabout) and (fo+1/2ft-fabout+ft), which give a spectral line at the frequency ft.

The most likely obstacle that we can put the opponent in such a signal, is a dangerous pulse barrage interference with the wasp equal to the band SFMS (Address, control and communications systems. Optimization issues. /Under the editorship of GI Tuzova. - M.: Radio and communication, 1993, p.123-127). This interference can increase the probability of error in a radio link to an unacceptably large value.

These drawbacks can be resolved,

firstly, the destruction of the symmetry of the amplitude spectrum, which prevents the formation of the spectral line at the frequency 2fo;

- secondly, the compensation of spectral lines at frequencies 2fo±ftmoreover , the formation of the compensating voltage is provided by radiation with high power and narrow portions of the spectrum are simple SFMS in each of the side strips in combination with negation (inversion) portions of the spectrum that is symmetric with respect to the frequency fo+1/2ftand fo-1/2ftrespectively;

- thirdly, the change of pseudo law selected narrow portions of the spectrum emitted by a higher power, which complicates the identification signal and reduces the possibility of staging the most dangerous interference.

The objective of the present invention is to improve noise immunity radio and is achieved in that in the method of forming complex photomanipulating signal, which consists in expanding the range of simple photomanipulating signal is received from the on multiplication carrying a sinusoidal oscillation with frequency f aboutand the binary signal information according to the invention used for spread spectrum pseudo-random sequence (SRP) with a clock frequency ftdivided into two orthogonal sequences, one of which contains only even harmonics of the source of the SRP, and the other only odd, then each of the obtained sequences Peremohy with simple photomanipulation signal, then from the spectrum of one of the received signal to produce an upper sideband of the spectrum, another signal is lower sideband, these opposite side of the strip is folded, each side of the strip distinguish two narrow part of the spectrum that is symmetric with respect to the frequency fo+1/2ftin the upper side band and the frequency fo-1/2ftin the lower side band, in each of the side bands of one of the selected portions of the spectrum increase to a certain value, and the other, symmetric him, invert, and then selected and the remaining unselected segments of the spectrum in both side bands summarize, and allocated the narrow portions of the spectrum in each of the side bands change pseudo law.

Graphic materials submitted in the application:

Figure 1. - Functional diagram of a device implementing the method-prototype.

Figure 2. - An example of the symmetry of the phase spectrum is SFMS.

Figure 3. - Functional diagram of the device that implements the proposed method.

Figure 4. The shape of the amplitude spectrum of the output signal.

Figure 5. - Example of implementation of the switchable inverter.

6. - Functional diagram of the control unit.

The proposed method is implemented in the device, a functional diagram of which is shown in figure 3, where indicated:

1 is a pseudorandom sequence generator (gpsa);

2 - delay block, on the half period of the SRP;

31,...3N- bandpass filters;

4 - block synchronization;

51, 52, 53- adders;

6 is a block subtraction;

71,...7N- adjustable amplifiers;

8 - control;

9 - generator rotor oscillations;

101, 102, 103the multiplier products;

111,...,11N- switchable inverters;

12 - filter upper (lower) sideband;

13 - filter bottom (top) sidebar.

The device comprises a generator SRP 1, the first output of which through the synchronization unit 4 is connected to the input of the control unit 8, and a second output connected to the first inputs of the adder 51, the subtraction unit 6 and to the input of the delay block 2, the output of which is connected with the second inputs of the adder 51and subtraction unit 6. The output of the adder 51through consistently United multiplier 102and Phi is Tr the upper (lower) side of the strip 12 is connected to a first input of the adder 5 3the second input of which is connected in series through the filter of the lower (upper) side of the strip 13 and the multiplier 103connected to the output of the subtraction unit 6. The device comprises also connected in series carrier wave generator 9 and the multiplier 101the second input which is the input binary signal information, and the output is connected with the second inputs of the multiplier products 102and 103. The output of the adder 5 is connected to the input of each of N bandpass filters 31,...,3Nthe outputs are connected in series through the respective adjustable amplifiers 71,...,7Nand switchable inverters and 111,...,11Nconnected to respective N inputs of the adder 52whose output is the output device. The first N outputs of the control unit 8 is connected with the second (control) inputs of the respective adjustable amplifiers 71,...,7Nand second N outputs of the control unit 8 is connected with the second (control) inputs of the respective switchable inverters 111,...,11N.

The device that implements the proposed method, as follows.

Periodic pseudo-random sequence with a clock frequency ftproduced by the generator 1, put in the adder 51and subtract in BC is ke 6 detained on pollperiod copy coming from the output of block 2.

As a result, the output of the adder 51formed sequence, the spectrum of which consists only of even (2,4,6...) harmonics of the source of the SRP, and the output of the subtraction unit 6 is formed another sequence, the spectrum of which consists only of odd (1,3,5...) harmonics of the original SRP.

In block 101Peremohy carrying a sinusoidal oscillation with frequency foproduced by the generator 9, and a binary signal information, to deliver a simple photomanipulating signal whose spectrum extends by multiplying this signal in blocks of 102and 103with the corresponding orthogonal sequences, outputs of the adder 51and subtraction unit 6.

The filter sidebar 12 selects the top (or bottom) spectrum band signal from the output of block 102and the filter sidebar 13 allocates respectively the lower (or upper) band of the spectrum of the output signal from the multiplier 103.

In addition to these opposite lateral stripes on the output of the adder 53formed two-signal single-ended amplitude spectrum (the presence of harmonics in the upper side band corresponds to the absence of the corresponding harmonics in the lower side band).

Next, from the spectrum of the received signal in each is the iron band is allocated, for example, using a comb bandpass filters 31,...3Ntwo narrow part of the spectrum that is symmetric with respect to the frequency fo+1/2ftin the upper side band and the frequency fabout-1/2ftin the lower side band. In each of the side bands of one of the selected portions of the spectrum increase in the relevant regulated amplifier 71,...,7Nto a certain calculated values, and the other marked area, symmetric him, invert (change the sign of the input voltage) in the corresponding switchable inverter 111,...,11Nby commands from the corresponding output of the control unit 8. The gain of each of amplifiers 71,...,7Ndepends on the level of the control voltage supplied from the corresponding output unit 8.

In the adder 52all selected and the remaining unselected segments of the spectrum in both side bands summarize.

Thus, at the output of the device is difficult combined photomanipulating signal consisting of broadband and four narrow-band component, the amplitude spectrum is shown in figure 4, where

Δf - width of the spectrum is simple PMNs, which can be taken equal to the bandwidth of the broadband components;

ΔF - frequency band and one narrow-band components;

K - K is the ratio of amplification of the selected narrow spectral region;

Nc- spectral density simple Fmns capacity of pwithequal.

This signal can be considered as the sum of two signals: broadband with high energy structural secrecy and signal with slow frequency hopping with reduced energy reserve.

The possibility of formation of a discrete spectral line at the frequency 2faboutexcluded due to the destruction of the symmetry of the amplitude spectrum versus frequency fo.

To exclude the possibility of formation of discrete spectral lines at frequencies 2fo±ftis achieved by compensation, which shall be determined by adding different signs of the components, due to the broadband and narrowband components, which can be seen from figure 4.

To compensate for the discrete lines at frequencies 2fo±ftassuming uniformity of the spectrum simple SFMS you need to meet the equality

where gain

The above equation reflects the equality of the amplitudes of discrete lines at frequencies 2fo±ftformed in each side of the runway with the multiplication of narrowband components of the symmetric part of the spectrum and the other portions of the spectrum are simple Fmns./p>

Change frequency narrowband component and symmetric them in the side portions of the spectrum bands is pseudo law. Thus, the simulated signal with frequency hopping. Narrowband components, obviously, have a lower energy reserve, therefore, are detected faster than broadband component. It is natural to assume that suppressed in the first place will be narrowband components and likely will be used narrowband sighting frequency interference. These narrowband interference during signal reception can be registrovani. While broadband component can be taken as the usual binary SFMS.

It should be emphasized that the proposed method can generate a complex signal, which can be accepted by the receivers of the old Park, is SFMS.

Thus, the use of the proposed complex combined photomanipulating signal

- first, it complicates the detection, identification and disclosure of its structure typical razodrannoj SFMS;

- secondly, it reduces the possibility of arming the enemy most dangerous interference;

- third, may be the receivers of the old Park without modification.

It follows that the use of such a signal can improve on ecosediment of links compared to the application of the model (binary) SFMS.

The elements included in the device, the functional diagram is shown in figure 3, are mostly standard.

An example implementation of a switchable inverter 11 are presented in figure 3, where indicated:

11.1 - non-inverting repeater;

11.2 - inverting repeater;

11.31, 11.32keys;

11.4 diagram OT;

11.5 - adder.

Each of the switchable inverter 111...11N(figure 3) contains serially connected non-inverting repeater 11.1 and 11.3 key1whose output is connected to the first input of the adder 11.5 whose output is the output of the inverter 11, serially connected inverting repeater 11.2 and 11.3 key2whose output is connected to the second input of the adder 11.5, and inputs repeaters 11.1 and 11.2 are combined and the first input of the inverter 11. Second input of the switchable inverter 11 is a control (figure 3) and is connected with the second input key 11.32and through diagram OT 11.4 - with the second input key 11.31.

Keys 11.31, 11.32unlocked when applying for the second (control) inputs of the logic unit and is passed to output the input signal with inverted or without depending on the control voltage.

The control unit 8 at its output produces pulses that control the gain coefficients is of adjustable amplifiers 7 1,...,7Nand switchable inverters 111,...,11N. In the simplest case it can be made on the basis of the trigger pulse counter and groups of decoders that are configured on a specific state of this counter.

Functional diagram of the control unit 8 are presented in (Fig 6).

When changing the status counter change the number of adjustable amplifiers 71,...7N(3) with high gain (K), and therefore, there is a jump in the frequency of narrow-band components. This enables the corresponding inverter 111,...,11N(3) the symmetric part of the spectrum of the signal.

Suppose that. Then the number of flip-flops in the counter must be equal to 6 (26=64).

The outputs of the counter flip-flop formed six-digit number, ranging from 000000 and to 111111. Using estephania circuit And connecting their outputs to the corresponding direct and inverse outputs of the counter flip-flop using fabric, you can arrange 64 decoder. Each decoder is configured on the corresponding number.

The first set of 64 decoders will change the gain of the respective adjustable amplifiers 71,...,7N(figure 3). The second set of 64 decoders will manage sootvetstvuyuthimi 11 1,...,11N(figure 3).

The synchronization unit 4 may be configured as a decoder, the output of which pulse appears at a certain combination of States of the flip-flops of the shift register, based on the generator SRP 1.

The method of forming complex photomanipulating signal, which consists in expanding the range of simple photomanipulating signal, obtained by multiplying the carrier sinusoidal oscillations with frequency faboutand the binary signal information, characterized in that is used for spread spectrum pseudo-random sequence (SRP) with a clock frequency ftdivided into two orthogonal sequences, one of which contains only even harmonics of the source of the SRP, and the other only odd, then each of the obtained sequences Peremohy with simple photomanipulation signal, then from the spectrum of one of the received signal to produce an upper sideband of the spectrum, another signal is lower sideband, these opposite side of the strip is folded, each side of the strip distinguish two narrow part of the spectrum that is symmetric with respect to the frequency fabout+1/2ftin the upper side band and the frequency fabout-1/2ftin the lower side band, in each of the side bands of one of vydeleny the x portions of the spectrum increase to a certain value, and the other, symmetric him, invert, and then selected and the remaining unselected segments of the spectrum in both side bands summarize, and allocated the narrow portions of the spectrum in each of the side bands change pseudo law.



 

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