Device for forming complicated phase-manipulated signal

FIELD: radio engineering.

SUBSTANCE: device, having bearing oscillation generator, output of which is connected to signal input of first key and to input of first phase shifter, output of which is connected to signal input of second key, outputs of first and second keys are connected to appropriate inputs of adder, output of which through multiplier is connected to output of device, device additionally has pseudo-random series generator, clock input of which is connected to output of clock pulse generator, and synchronization input is connected to output of synchronization pulse generator and to second synchronization means input, first input of which is input of information signal, and output is connected to second multiplier input, device also includes commutation block, M decoders, M-2 keys, M-2 phase shifters, pseudo-random series delays block.

EFFECT: better concealment and detection protection level of generated signal.

6 dwg

 

The present invention relates to the field of radio and can be used to improve structural secrecy of signals in noise-radio links.

It is known (Address, control and communications systems. Optimization issues. Ed. Heatwave. - M.: Radio and communication, 1993)that the probability of interception information and setting the most dangerous interference in terms of electronic warfare (EW) depend on stealth used in radio signals. Discretion determines the probability of detection of the radio signal by the enemy, his identity (identification), the evaluation parameters and the effectiveness of organized noise.

Currently secrecy is achieved by using a complex phase-shift keyed signals (SFMS). The application of these signals allows to increase both energy and structural components of stealth.

However, the manipulation phase only two values 0 and π limits their structural secrecy.

To improve structural secrecy and resizewindow in the patent of Russian Federation №2205496 "Method of forming and processing the complex signal in the noise of the radio", a method of forming a complex signal based on quasicomatose vector. The disadvantage of this method is the loss in signal-to-noise ratio when receiving such a signal reception is the IR of the old Park, designed for binary SFMS caused by the randomness of the structure of the signal vector. To resolve the receiver's uncertainty structure of the signal vector is impossible, because it is formed of the really noise process.

As a prototype of the selected standard method of formation of binary SFMS, the essence of which is illustrated Risa figures 1.8 and on p.16-17 books (Lehrerin. Communication systems with noise-like signals. - M.: Radio and communication, 1985).

The essence of the prototype method is to sequentially perform the following operations: sinusoidal bearing oscillation Peremohy binary (±1) a pseudo-random sequence (SRP), and then the obtained binary signal carrier Peremohy binary (±1) signal information.

However, the formation of SPMs on the prototype method provides insufficient structural secrecy (resizewindow) of the received signal.

Indeed, during the construction of binary photomanipulating (QPSK) signal into a square formed of discrete spectral lines at frequencies 2f0and 2f0±ftwhere ft- clocked SRP (Belyakov A.L., Biconical CENTURIES, Trembachev AV Equipment and software for automated technical analysis of radio signals. Special technique, 2003, special edition,p.20-26). The appearance of these spectral lines is unmasking sign binary SFMS, facilitates their detection, parameter estimation and disclosure patterns.

To address this shortcoming in the way of forming complex photomanipulating signal, which consists in the multiplication photomanipulating signal vector with a binary data signal according to the invention as a signal vector using multi-phase (M-phase, M≫2) photomanipulating signal.

The use of multi-phase QPSK signal vectors significantly complicates the detection of spectral lines, which are formed during the construction of M-phase QPSK signal vector in the M-th power (by multiplying the carrier frequency FMN signal M times).

Indeed, in the construction of the signal in the M-th power of the ratio signal/noise in the area of frequency Mfoat low input signal to noise is approximately equal to (V.I. Tikhonov Statistical radio engineering. - M.: Radio and communication, 1982, str).

So, when

M=2,

M=8.

With respect to the input and output strips equal to 10, the output signal-to-noise ratio in the first case will be

and in what PR

Thus, generated during the construction of the 8-th degree 8-phase QPSK signal vector spectral lines at frequencies 8f0and 8f0±ftpractically will not be detected.

When binary SFMS the corresponding lines will be detected with high probability.

Graphic materials submitted in the application:

figure 1 - functional diagram of a device implementing the method-prototype;

2 is a functional diagram of the device that implements the proposed method;

figure 3 - vectors of elements of the multi-phase QPSK signal vector;

4 is a functional block circuit delays the SRP;

5 is a functional block circuit switching;

6 is a functional block diagram of phasers.

Given that the multiplication of sinusoidal oscillations (-1) corresponds to his shift on π happy, functional scheme that implements the method-prototype, can be represented as shown in figure 1, where indicated:

I - multiplier;

1 is a generator of clock pulses;

2 - generator SRP;

3 is a generator of clock pulses;

4 - synchronizer;

5 - scheme "NOT";

61, 62keys;

7 - adder;

8 - multiplier;

9 - generator rotor oscillations;

10 - Phaser(π),

where f0often the and carrier oscillation.

The device prototype contains a carrier wave generator 9, the output of which is connected to the signal input key 61and through the phase shifter 10 with a signal input key 62the control input of which is connected through the scheme of "NOT" 5 with the control input key 61and with the generator output SRP 2, a clock input connected to the output of clock 1. The outputs of the keys 61and 62connected to respective inputs of the adder 7, the output of which through the multiplier 8 is connected to the output device. The output of clock generator 3 is connected to the input of the sync generator SRP 2 and with the second clock input is 4, the first input which is the input information and the output is connected to the second input of the multiplier 8.

This scheme is fully equivalent to Risa books (Lehrerin. Communication systems with noise-like signals. - M.: Radio and communication, 1985) taking into account the fact that the elements of the device-prototype - scheme "NOT" 5 keys 61, 62the adder 7 and the phase shifter 10 is, in essence, form a diagram of the multiplier I SRP elements ±1 and sinusoidal oscillations from the output of the generator rotor oscillations 9.

The operation of the prototype is as follows.

The carrier wave generator 9 generates a sinusoidal oscillation with frequency f01and through the phase shifter 10 to the key 62with a phase shift on π. Clock 1 provides the generator SRP 2, generating a binary pseudo-random sequence, which is a positive potential (+1) unlocks the key 61. Negative (or zero) potential is inverted in the scheme of "NOT" 5 and unlocks the key 6 (key 61locked). Keys 61, 62missing pieces of the sinusoidal phases, respectively equal to 0 and π. As a result, the output of the adder 7 is formed binary photomanipulating (QPSK) signal-vector, which is multiplied by the multiplier 8 binary information signal.

"Binding" pulse information signal to a particular phase of the SRP is performed by the clock pulses produced by the generator 3, which is installed in a given state generator SRP 2 and set the pulse fronts of the information signal in the synchronizer 4.

The objective of the present invention is to improve stealth and resizewindow formed SFMS and is achieved by the apparatus for forming complex photomanipulating signal containing a carrier wave generator, the output of which is connected to the signal input of the first key and input Pervov the Phaser, the output of which is connected to the signal input of the second key, the outputs of the first and second keys are connected to respective inputs of the adder, the output of which through a multiplier coupled to the output device, the pseudo-random sequence generator (SRP), a clock input connected to the generator output clock, and the synchronization input is connected to the generator output clock and the second clock input, the first input which is the input information and the output is connected to the second input of the multiplier, according to the invention introduced switching unit, M decoders, M-2 key whose outputs are connected to respective inputs of the adder, M-2 phasers, delays SRP, signal input connected to the output of the generator of the SRP, the synchronization input of which is connected to the installation by entering the unit delays of the SRP, the clock generator input SRP is connected to the clock input of the unit delay SRP, 2log2M direct and inverse outputs of which are connected to respective inputs of the switching unit, Mlog2M outputs of which are connected with the corresponding log2M inputs of each of the M decoders, the outputs of which are connected to control inputs of the respective M key signal inputs of the third... M-th keys are connected with the corresponding outputs of the who... (M-1)-th phase, the inputs of all (M-1) phase of the joint and is connected to the output of the generator rotor oscillations.

The proposed method of forming SFMS can be implemented in the device functional diagram of which is shown in figure 2, where indicated:

1 is a generator of clock pulses;

2 - generator SRP;

3 is a generator of clock pulses;

4 - block delays the SRP;

5 - switching unit;

6 - synchronizer;

71...7M- decoders;

81...8Mkeys;

9 - adder;

10 - multiplier;

12 - generator rotor oscillations;

I - block phasers 111...11M-1.

The proposed device comprises a carrier wave generator 12, the output of which is connected to the signal input key 81and with the combined inputs of all phasers 111...11M-1the outputs are connected to signal inputs of the keys 82...8Mrespectively. The outputs of the keys 81...8Mconnected to respective inputs of the adder 9, the output of which through the multiplier 10 is connected to the output device. The clock generator input SRP 2 is connected to the output of clock 1 and clock input of the unit delay SRP 4, 2log2M direct and inverse outputs of which are connected to respective inputs of the switching unit 5, Mlog M outputs of which are connected with the corresponding log2M inputs of each of the M decoders 71...7Mthe outputs are connected to control inputs of the respective keys 81...8M. The output of clock generator 3 is connected to the input of the sync generator SRP 2, with the mounting unit delays SRP 4 and with the second clock input 6, a first input which is the input information and the output is connected to a second input of multiplier 10. The generator output SRP 2 is connected to the signal input unit 4.

The operation of the device is as follows.

The carrier wave generator 12 produces a sinusoidal oscillation with frequency f0coming to the key 81and at the joint entrance phasers 111...11M-1. With outputs of phasers 111...11M-1the keys 82...8Mserved sinusoidal oscillation with an initial phases, respectively. Clock 1 provides the generator SRP 2 and unit delays SRP 4. Arriving at the signal input unit 4 SRP delayed it 0,1,2,...log2M clock cycles. Delayed copies of the SRP are allocated on a log2M pairs of outputs of unit 4 (on each output pair is allocated a direct or inverse copy of the SRP). Switching unit 5 serves as the La connection of the inputs of the decoders 7 1...7Mto the respective outputs of the block 4. The switches in the switching unit 5 is connected to the inputs of the respective decoders 71...7Meither direct or inverted output triggers from the block delay SRP 4. The keys 81...8Mone unlocks the signals from the outputs of the decoders 71...7M. As a result, the output of the adder 9 is formed M-phase QPSK signal-vector, which is multiplied by the multiplier 10 binary signal information. The pulses produced by the generator 3, is "binding" of the fronts of the pulses of signal information in the synchronizer 6 to a specific state of the generator SRP 2.

Usually for new signals are required in order they were received by the receivers of the old Park without any modification. We assume that the transmitters of the old Park of binary QPSK signal carrier is formed by multiplying a sinusoidal carrier wave coming from the output of the generator 12, with the SRP produced by the generator 2. Then the value (+1) SRP must match the vectors of the elements of the M-phase QPSK signal vector, located in the upper half-plane, and the value (-1) is in the lower half-plane (figure 3).

For this condition it is necessary that the decoders 71...7Mdeveloped appropriate enabling signals for CL is whose 8 1...8M.

For definiteness we will consider signals with values M=2kwhere k=3,4,..., in which the values of M can be obtained from log2M=KSP.

Let M=8. Then to the inputs of the decoders 71...7Mit is enough to submit three SRP, resulting in the following combinations are equally likely elements SRP:

1 1 -1 → 45°;

1 -1 1 → 90°;

-1 1 1 →270°;

1 1 1 → 0°;

-1 -1 -1 → 180°;

1 -1 -1 → 315°;

-1 1 -1 → 135°;

-1-1 1 → 225°,

you can assign specific values to the initial phase noise impulses, indicated on the right.

This multiphase SFMS you can take the appropriate receiver binary SFMS. This loss amount

Thus, the proposed device allows you to generate multiphase SFMS for increased structural secrecy, which can be taken as a binary SFMS receivers of the old Park.

The unit delays SRP 4 can be made in the form of a shift register (figure 4), the initial set of triggers which a corresponding connecting the inputs R and S to the bus Installation.

Switching unit 5 may be performed according to the scheme shown in figure 5. It serves to connect the inputs of the decoders 71...7Mthe respective outputs of the block 4. The switches in the switching unit 5 is connected to the inputs of the respective decoders 71...7Meither direct or inverted output triggers from the block delay SRP 4.

Block phase I can be completed on a delay line with taps over time ΔT (6)with,.

At the i-th tap of the delay line phase sinusoidal oscillations with frequency f0equal to

i=1,...M-1.

The device prototype delay line is.

During this phase of the output oscillations is equal to.

Apparatus for forming complex photomanipulating signal containing a carrier wave generator, the output of which is connected to the signal input of the first key and the input of the first phase shifter, the output of which is connected to the signal input of the second key, the outputs of the first and second keys are connected to respective inputs of the adder, the output of which through a multiplier coupled to the output device, the pseudo-random sequence generator (SRP), a clock input connected to the generator output clock, and the synchronization input is connected to the generator output clock and the second clock input, the first input to which is showing the input information, and the output is connected to the second input of the multiplier, characterized in that it introduced switching unit, M decoders, M-2 key whose outputs are connected to respective inputs of the adder, M-2 phasers, delays SRP, signal input connected to the output of the generator of the SRP, the synchronization input of which is connected to the installation by entering the unit delays of the SRP, the clock generator input SRP is connected to the clock input of the unit delay SRP, 2log2M direct and inverse outputs of which are connected to respective inputs of the switching unit, Mlog2M outputs of which are connected with the corresponding log2M inputs of each of the M decoders, the outputs of which are connected to control inputs of the respective M key signal inputs of the third,... M-th keys connected to respective outputs of the second,... (M-1)-th phase, the inputs of all (M-1) phase of the joint and is connected to the output of the generator rotor oscillations.



 

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