RU2734431C1 - Transmitter of structural stealth using principle of nonlinear code sequences detection - Google Patents

Abstract

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering and can be used to create a transmitter having structural concealment and property to detect nonlinear sequences and to open structure of their formation. Structural stealth transmitter using the principle of detecting non-linear code sequences consists of a clock generator, two generators of a linear pseudorandom sequence, four adders of logical addition by modulus 2, a unit for digitization of speech information, a generator of a carrier frequency, two multipliers, phase changers, an algebraic adder of a sequence, a band-pass filter, a generator and two devices for detecting nonlinear code sequences.

EFFECT: technical result consists in the possibility of detecting nonlinear code sequences.

1 cl, 1 dwg

Description

The invention relates to the field of radio engineering and can be used to create a transmitter that has structural secrecy and has the ability to detect nonlinear sequences and reveal the structure of their formation.

A small-sized transmitter with increased energy secrecy is known for its similar practical use, the principle of operation of which is based on the property of the transmitter signal, which remains "blurred" in the event of its preliminary detection [1].

The disadvantages of these devices are the inability to detect nonlinear sequences, as well as low structural secrecy.

The closest in technical essence is a transmitter of increased structural and energy secrecy [2], the principle of operation of which is based on the fact that the detector perceives the useful signal as noise or its change, as well as a change in the useful signal codogram.

The use of such devices is limited by the lack of the possibility of detecting nonlinear sequences and opening the structure of their formation.

The objective of the invention is to create a technical solution, alternative to the known solution, using the principle of detecting nonlinear code sequences, disclosed in the corresponding device [3].

The required technical result is achieved by the fact that the proposed device contains a clock generator, two generators of a linear pseudo-random sequence, four adders for logical addition modulo 2, a speech information digitizing unit, a carrier frequency generator, two multipliers, a phase shifter, an algebraic adder of a sequence, a band-pass filter, an additional generator and 2 devices for detecting nonlinear code sequences [3].

The essence of the invention is illustrated by a drawing, where FIG. 1 shows a possible variant of constructing a transmitter of structural secrecy using the principle of detecting nonlinear code sequences, which contains:

1 - clock generator;

2 - generator of linear pseudo-random sequence 1;

3 - generator of a linear pseudo-random sequence 2;

4 - adder of logical addition modulo 2;

5 - adder of logical addition modulo 2;

6 - block for digitizing speech information;

7 - adder of logical addition modulo 2;

8 - adder of logical addition modulo 2;

9 - carrier frequency generator;

10 - multiplier 1;

11 - multiplier 2;

12 - phase shifter;

13 - algebraic adder of the sequence;

14 - band pass filter;

15 - additional generator;

16 - device for detecting nonlinear code sequences 1;

17 - device for detecting nonlinear code sequences 2.

The transmitter of structural secrecy using the principle of detecting nonlinear code sequences works as follows: from the clock generator (1), a clock pulse is applied simultaneously to an additional generator (15) and to two linear pseudo-random sequence generators (registers) (2 and 3). These registers contain orthogonal linear pseudo-random sequences (eg m-sequences). The clock pulse instructs the registers to sequentially output the values written in them sequentially and synchronously. From the additional generator (15), the clock pulse is fed to the logical addition adder modulo 2 (7) and to the logical addition adder modulo 2 (8), where it is summed with the clock pulse coming from the logical addition adder modulo 2 (4) and the linear generator pseudo-random sequence 2 (3). From the linear pseudo-random sequence generator 1 (2), in this case, a biased value is output to the logical addition modulo 2 (4) and an unbiased value, first to the input of the nonlinear code sequence detection device 1 (16), after which, from the output of the nonlinear code sequences 1 (16), the signal is fed to the input of the logical addition adder modulo 2 (5). From the block for digitizing speech information (6), at the same time, the information signal in digital form is fed in parallel to the logical addition adders modulo 2 (4 and 5). Thus, the primary modulation of information is carried out with the sequence from the logical addition adder modulo 2 (5) and its shifted value - from the logical addition adder modulo 2 (4). The modulated values are fed to the modulo 2 adders (7 and 8). Here, the second modulation of the signals with summation occurs with the values obtained from the linear pseudo-random sequence generator 2 (3), which after it are fed to the input of the nonlinear code sequence detector 2 (17), and then from the output of the nonlinear code sequence detector 2 (17) the signal is fed to the inputs of the logical addition adders modulo 2 (7 and 8). The modulated values from the logical addition adders modulo 2 (7 and 8) are fed to the multipliers (10 and 11). In these blocks, amplitude modulation takes place by the product of the cosine (10) and sinusoidal signals (11), respectively. The cosine wave is obtained in the carrier frequency generator (9), and the sinusoid is obtained by the orthogonal transformation of the cosine wave in the phase shifter (12). The resulting complex signals from the multipliers (10 and 11) are fed to the algebraic adder of the sequence (13), after which the sum passes the band-pass filter (14) and is fed to the loaded antenna.

SOURCES OF INFORMATION

1.Ru 2568288, 2015

2.Ru 2646353, 2018

3.Ru 2667405, 2018

Claims (1)

Transmitter of structural secrecy using the principle of detection of nonlinear code sequences, consisting of a clock generator (block 1), two linear sequence generators (block 2, 3), four logical summers modulo 2 (blocks 4, 5, 7, 8), a block digitization of speech information (block 6), a carrier frequency generator (block 9), two multipliers (blocks 10, 11), a phase shifter (block 12), an algebraic adder of quadrature channels (block 13), a bandpass filter (block 14), a generator (block 15), characterized in that it additionally includes a device for detecting nonlinear code sequences 1 (block 16) and a device for detecting nonlinear code sequences 2 (block 17), and the output of a linear sequence generator (block 2) is connected to the input of a device for detecting nonlinear code sequences 1 (block 16), the output of the device for detecting nonlinear code sequences 1 (block 16) is connected to the input ohm of the logical addition adder modulo 2 (block 5), the output of the linear sequence generator (block 3) is connected to the input of the device for detecting nonlinear code sequences 2 (block 17), the output of the device for detecting nonlinear code sequences 2 (block 17) is connected to the inputs of the logical adders addition modulo 2 (blocks 7 and 8).

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