The formation method of noise impulses for transmission of binary symbols information complex signals

 

The invention relates to electrical engineering and can be used in communication systems. The formation method of noise impulses for transmission of binary symbols of complex information signals is characterized by the fact that you are doing the minimum codestone modulation of the carrier frequency by summing the modulated amplitude and phase fluctuations of the quadrature channels, modulation code sequence which is obtained by encoding pseudonoise code sequence of the radar pulse, perform Gating of the amount received by the video impulse equal to the length of the code sequence forming the opposite signal is performed by the inversion code modulation code sequence of one of the quadrature channels. Technical result achieved - increased robustness of the communication system. 3 Il.

The invention relates to electrical engineering and can be used in communication systems, in the field of radar, radio navigation systems, remote sensing of the ionosphere and other radio systems and devices that you want to have Nadine pseudonoise signals by phase modulation of the carrier frequency code sequence, thus, when a character code is equal to +1, is transmitted itself is the carrier frequency, if the character code is equal to -1, the carrier phase is changed by 180[Dixon, R. K. Broadband system /Translated from English p/R C. I. Zhuravleva. M: “Link”, 1979. 304 S.].

The disadvantages of the method are that phase shift keying used to obtain a coded radar pulse, has the property of ambiguous solutions, which leads to negative work, namely, that passed a “unit” can be taken as “zero” and “zero” as “unit”. This disadvantage is completely fatal for phase manipulation, resulting in radiationexposure radio pulses cannot be used as the opposite of signals for transmission of binary characters of information.

There is a method of transmitting binary symbol information of complex signals, which for the formation of binary “unit” is used for phase modulation of the carrier frequency code sequence, and for the formation of a “zero” carrier is modulated by a different code sequence, the code which differs from the previous one [p. N. T., Razmahnin M. K. communication Systems with noise-like signals. - M.: the p. In this way the transition from “unit” to “zero” and back is performed by switching the feedback circuit of the shift register, engaged in the generation of the code sequence.

The drawback of this method is that the correlation function codes representing a binary “one” and “zero” are significant differences in the structure of the side lobes, which leads to differences in the probability of presence “zero” or “units” at the input of the receiver.

From theory of error-correcting reception it is known that the greatest immunity have opposite signals. These properties are noise-like radio pulses that have the same structure of the correlation function, but different polarity. Such impulses can be obtained by using vnutriklubnoy frequency manipulation to get rid of the uncertainty of the initial phase of the received radar pulse and enabling direct code to use to transfer the binary symbol unit, and the inverse code for transmission of a binary “zero”, or Vice versa.

The invention aims to improve the noise immunity of the system transmitting information through the use of a complex pseudonoise radionu is formirovaniya of noise impulses for transmission of binary symbols of complex information signals, including modulation of the carrier frequency code sequence, carry out the minimum codestone modulation of the carrier frequency by summing the modulated amplitude and phase fluctuations of the quadrature channels, modulation code sequence which is obtained by encoding pseudonoise code sequence of the radar pulse, then perform the Gating of the amount received by the video impulse equal to the length of the code sequence forming the opposite signal is performed by the inversion code modulation code sequence of one of the quadrature channels.

The structure of the code modulation code sequence of each channel in the conversion should be such that the result of the bitwise multiplication codes and quadrature-phase channels represented in the code pseudonoise of the radar pulse. In addition, the generated video impulse whose duration is equal to the length of the code sequence, intended for use as a gate pulse. In each of the channels modulation code sequence is multiplied by the quadrature components of the low frequency Garmaise spectrum shift of the received oscillations in the high frequency range, resulting modulated in amplitude and phase fluctuations.

After summing the modulated amplitude and phase fluctuations of the quadrature channels is allocated pseudonoise radar pulse by Gating.

For forming the opposite signal is sufficient to invert the code sequence of one of the quadrature channels.

Features of the invention lie in the fact that you are doing the minimum codestone modulation of the carrier frequency by summing the modulated amplitude and phase fluctuations of the quadrature channels, modulation code sequence which is obtained by encoding pseudonoise code sequence of the radar pulse, perform Gating of the amount received by the video impulse equal to the length of the code sequence forming the opposite signal is performed by the inversion code modulation code sequence of one of the quadrature channels.

The presence of distinctive features allows to make a conclusion on the compliance of the claimed invention, the criterion of “novelty”.

Analysis of patent and scientific and technical information is not allowed to reveal the sources that contain information the constituent of the invention, the criterion of “inventive step”.

Implementation of the proposed method let us consider the formation of noise radar pulse with vnutripolostnoe minimum frequency shift keying encoded in accordance with a Barker code with length N=7, the code of which is represented in the form

it is shown in Fig.1, where (a) Barker code with length N=7.

For the formation of noise radar pulse with vnutripolostnoe minimum frequency shift keying in accordance with this code required recoding for this:

1) generate in-phase component, I, code which is

1,1,1,-1,-1,1,1,

view the in-phase component of the code is demonstrated in Fig.1, where (b) code modulation code sequence of in-phase channel;

2) generate a quadrature component, Q,

1,1,1,1,1,1,-1,

it is shown in Fig.1 where code modulation code sequence quadrature channel;

3) generate the gate pulse duration Nthat in this example is 7where- the duration of an elementary discrete code Barker

1111111,

Fig.1, where (d) Gating the video impulse.

Easily ramnarine, get

4) in-phase component, I, is multiplied by the cosine harmonic functions,. In Fig.2 shows oscillograms: (a) modulation code sequence of in-phase channel, b) - harmonic functions with period equal to 4and (C) is the result of their multiplication. The resulting product is multiplied by the cosine of the carrier frequency, Cost, as a result of these operations receive amplitude modulated and phase component

5) quadrature component, Q, multiplied by the sine harmonic functions,and the resulting product is multiplied by the sine of the carrier frequency, Sint, resulting in a gain modulated in amplitude and phase component

6) summarize the obtained compositions (2) and (3)

7) oscillation (4) allocate the gate pulse, resulting in a gain pseudonoise radar pulse with vnutripolostnoe frequency shift keying encoded according to the law change the sign of the work (IQ) (in the example considered Barker code). the codes and signs of the I and Q frequency of the resulting oscillations is equal toand by using different marks. The transition from one frequency to another occurs without breaking phase.

If invert code in one of the quadrature channels, you get the opposite pseudonoise radar pulse, the stages of which are shown in Fig.3, which shows: a) the inverted modulation code sequence of in-phase channel, b) the cosine harmonic functions, the period of which is equal to 4, (C) the result of multiplying the harmonic function and the inverted modulation code sequence, (d) formed opposite pseudonoise radar pulse with vnutripolostnoe minimum frequency shift keying.

Comparing the noise-like radio pulses in Fig.2 (d) and 3 (d). it can be noted that the noise-like radio pulses have the same amplitude and duration, therefore, have the same energy. The signal in Fig.2 (d) positive character code is transferred to a lower frequency1and the negative symbol - higher frequency2. The signal shown in Fig.3 (d), Vice versa. Thus, by encoding the transmitted symbols of the binary information from ispolzovanie, we get the correlation function, the main peak which takes a positive or negative value, depending on the transmitted symbol, and its polarity does not depend on the correlation of the phases of the received and reference oscillations, which increases the noise immunity of the transmission system.

Claims

The formation method of noise impulses for transmission of binary symbols of complex information signals including the modulated carrier code sequence wherein the minimum exercise codestone modulation of the carrier frequency by summing the modulated amplitude and phase fluctuations of the quadrature channels, modulation code sequence which is obtained by encoding pseudonoise code sequence of the radar pulse, perform Gating of the amount received by the video impulse equal to the length of the code sequence forming the opposite signal is performed by the inversion code modulation code sequence of one of the quadrature channels.

 

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FIELD: radio engineering; construction of radio communication, radio navigation, and control systems using broadband signals.

SUBSTANCE: proposed device depends for its operation on comparison of read-out signal with two thresholds, probability of exceeding these thresholds being enhanced during search interval with the result that search is continued. This broadband signal search device has linear part 1, matched filter 2, clock generator 19, channel selection control unit 13, inverter 12, fourth adder 15, two detectors 8, 17, two threshold comparison units 9, 18, NOT gates 16, as well as AND gate 14. Matched filter has pre-filter 3, delay line 4, n attenuators, n phase shifters, and three adders 7, 10, 11.

EFFECT: enhanced noise immunity under structural noise impact.

1 cl, 3 dwg

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