RU2646353C1 - Transmitter of increased structural and energetic concealment - Google Patents

Abstract

FIELD: radio engineering and communication.

SUBSTANCE: invention relates to radio engineering. For this, the transmitter consists of clock generator (1), linear sequence generators (2, 3), modulo 2 logical adders (4, 5, 7, 8), voice data digitization unit (6), carrier-frequency generator (9), multipliers (10, 11), phase-shifting unit (12), algebraic adder of Q channels (13), bandpass filter (14), where generator (2) and unit (6) are connected to adders (4, 5), all the adders are interconnected, generator (3) is connected to adders (7, 8), and adder (7) and adder (8) are connected to multipliers (10, 11), respectively, multiplier (10) is connected to generator (9) which is connected to phase-shifting unit (12), phase-shifting unit (12) is connected to multiplier (11), and multipliers (10, 11) are connected to adder (13) which is connected to bandpass filter (14), generator (9) is connected to phase-shifting unit (12) and multiplier (10), and clock generator (1) is connected to generators (2, 3), generator (15) being directly connected to adder (7) and adder (8), generator (1) being also connected to generator (15).

EFFECT: technical result consists in the creation of a technical solution alternative to the known one.

1 cl, 1 dwg

Description

The invention relates to the field of radio engineering and can be used to create a transmitter with increased structural secrecy.

Known for its similar practical use, the transmitter is based on the use of the IS-95 radio standard, the principle of which is based on the formation of a linear noise-like signal of a masking comb signal, in the windows of which useful information is transmitted [1].

The disadvantages of these devices are the difficulty in synchronizing the operation of the receiver and transmitter, as well as low structural secrecy.

The closest in technical essence is the small-sized transmitter of increased energy secrecy [2], the principle of operation of which is based on the fact that when you try to convolution in case of preliminary detection of the transmitter signal, it will remain “blurred” and the detector will perceive it as noise or its change, which significantly increases his energetic secrecy.

The use of such devices is limited by low structural secrecy and imitation resistance.

The objective of the invention is the creation of a technical solution alternative to the known solution [2].

The required technical result is achieved by the fact that the proposed device contains a clock generator, two linear pseudo-random sequence generators, four logical addition adders modulo 2, a speech information digitizing unit, a carrier frequency generator, two multipliers, a phase shifter, an algebraic sequence adder, a bandpass filter and an additional generator .

The invention is illustrated in the drawing, where in FIG. 1 shows a possible embodiment of a transmitter of increased structural and energy secrecy, which contains:

1 - clock generator;

2 - linear pseudo-random sequence generator 1;

3 - linear pseudo-random sequence generator 2;

4 - logical addition adder modulo 2;

5 - adder of logical addition modulo 2;

6 - block digitization of voice information;

7 - adder of logical addition modulo 2;

8 - logical addition adder modulo 2;

9 - carrier frequency generator;

10 - multiplier 1;

11 - multiplier 2;

12 - phase shifter;

13 - algebraic adder sequence;

14 - band-pass filter;

15 - an additional generator.

A transmitter of increased structural and energy secrecy works as follows: from a clock generator (1), a clock pulse is supplied simultaneously to an additional generator (15) and two linear pseudorandom sequence (register) generators (2 and 3). These registers contain orthogonal linear pseudorandom sequences (e.g., m-sequences). The clock pulse gives a command to the registers to sequentially issue the values recorded in them sequentially and synchronously. From the additional generator (15), the clock pulse is supplied 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 generator linear pseudo-random sequence 2 (3). From the linear pseudo-random sequence generator 1 (2), in this case, a biased value is output to the adder of logical addition modulo 2 (4) and unbiased to the adder of logical addition modulo 2 (5). From the block for digitizing voice information (6), at the same time, the information signal in digital form is fed in parallel to the logic combiners modulo 2 (4 and 5). Thus, the primary modulation of information is carried out with the sequence from the adder of logical addition modulo 2 (5) and its offset value from the adder of logical addition modulo 2 (4). Modulated values are fed to the adders of the logical addition modulo 2 (7 and 8). Here, the second modulation of the signals occurs with the summation with the values obtained from the linear pseudo-random sequence generator 2 (3). The modulated values from the logical adders modulo 2 (7 and 8) are fed to the multipliers (10 and 11). In these blocks, amplitude modulation occurs by the product of the cosine (10) and sinusoidal signals (11), respectively. The cosine wave was obtained in the carrier frequency generator (9), and the sine wave was obtained by the orthogonal transformation of the cosine wave in the phase shifter (12). The obtained 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.

Information sources

1. Standard IS-95. http://telecommun.ru/lektsii, 10-15 p.

2. RU 2568288, 2015.

Claims (1)

A transmitter consisting of a clock generator (1), two linear sequence generators (2 and 3), four logical addition adders modulo 2 (4, 5, 7 and 8), a block for digitizing voice information (6), a carrier frequency generator (9 ), two multipliers (10 and 11), a phase shifter (12), an algebraic adder of quadrature channels (13), a bandpass filter (14), while the linear sequence generator (2) is connected to the modulo logical summation adders (4 and 5), the unit for digitizing voice information (6) is connected to the adders of logical addition modulo 2 (4 and 5), logical adders modulo 2 (4 and 7) and logical adders modulo 2 (5 and 8) are interconnected, a linear masking pseudorandom sequence generator (3) is connected to logical adders in module 2 (7 and 8), and the adder modulo 2 (7) and the adder modulo 2 (8) are connected to the multipliers (10 and 11), respectively, the multiplier (10) is connected to the carrier frequency generator (9), which is connected to the phase shifter (12), the phase shifter (12) is connected to the multiplier (11), and the multipliers (10 and 11) are connected They are connected with an algebraic adder of quadrature channels (13), which is connected to a bandpass filter (14), a carrier frequency generator (9) is connected to a phase shifter (12) and a multiplier (10), and a clock generator (1) is connected to linear sequence generators (2) and 3), characterized in that the generator (15) is additionally introduced into it, connected directly by a logic addition adder modulo 2 (7) and a logical addition adder modulo 2 (8), and the clock generator (1) is also connected to generator (15).

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