SU683029A1 - Communication system with time-compression of noise -like signals - Google Patents

Description

the second adder, the outputs of which are connected to the third adder through the corresponding quadrants; the output of which is through a sequentially connected converter and the first; the second block is connected to the input of the anchoring unit, the outputs of which are connected. yen, respectively, with the control input of the modulator, another input of the threshold unit L1 received a block for frequency search and tuning with the control input of a carrier frequency generator.

FIG. 1 shows the structural electrical circuit of the proposed device; FIG. 2 - multichannel structural diagram: .orrel.

The communication system contains an information source /, a match block 2, a counter 3, a clock generator 4, a trigger 5, a switch 6, a generator 7 and S of a pseudo-random sequence, modulators 9 and W, a frequency generator, delay element 12, an output matching unit 13, input matching unit M, multichannel correlator 15, switch 16, elements 17, information recipient 18,) multichannel correlator 15 contains multiplier 19 and 20, carrier frequency generator 21, modulator 22, integrators 23, 24 adders 25, 26, 27, quadrs 28, 29 converters 30, a threshold unit 31, a control unit 32, a unit 55 for searching and adjusting the frequency.

The operation of the communication system consists of two modes: synchronization mode and information transfer mode.

In sync mode. the transmitting part generates a sequence of identical phase-manipulated noise-like signals. The receiving part produces a SEARCH and an adjustment for the delay and frequency of this signal, resulting in a sequence of clock pulses associated with the temporal position of the noise-like signals arriving at its input.

Information is also transmitted by the same signals and signals, but shifted in (time relative to the sync pulse from a number of elements of the noise-like signal.

Moreover, each information symbol corresponds to a specific temporary position. Clock synchronization in this is performed on information signals. The formation of the transmitter part of the noise: the background signals is carried out by phase modulation of the carrier frequency voltage by the modulators 9 and 10, generated by the carrier frequency generator 11, generated by the carrier frequency generator //, according to the law of pseudo-random sequences generated by the 7 and 5 generators, pseudo-random after ) 1 in telnpgti GPPTKRTSHTPRNNP

Generators 7 and 8 are triggered by a trigger for starting a match block 2, appearing at the time of a match, when the system has a counter code 5, cyclically driven by clock pulses 4, at the system input.

In the synchronization mode, a zero code is written at the system input and the output matching unit / 5 amplifies and emits

continuous sequence of noise-like signals.

In the mode of transmitting information to the input of the unit coincidentally and 2 are received sequentially with a period equal to the duration of the noise-like signal, information codes. In this case, start-up pulses appear with delays corresponding to the code. Because with this method of converting information, two adjacent

signals may overlap partially

time, they are formed from their generators 7 or 8 and modulators 9 or 10.

In addition, one of them additionally

shifts in time relative to the other by a quarter of the period carrying the oscillations by means of the delay element 12. The alternate switching of the start-up impulses is carried out by the switch € controlled by trigger 5 with the counting input,

connected to the highest bit of the counter 5.

The transmitted signal, received by the antenna input matching unit 14 of the receiving part of the system, is amplified and multiplied by the unlimited frequency 19 and 20, respectively, with sinusoidal cosine wave carrier voltages (frequencies generated by the 2 / carrier frequency generator. The multiplication results are manipulated

modulator 22 according to the law of pseudo-random sequences.

Moreover, the mode of operation of the modulator 22 varies depending on the mode of operation of the device and on the state of synchronization mode, which is divided into three stages. At the first stage, a sequential signal search in frequency and a coarse parallel search is performed: delay search. In doing so, the modulator 22 signals modulates

the signal of the multipliers 19 and 20 are pseudo-random sequences delayed subsequent relative to the previous one by the duration of the noise-like element. The signal modulated in this way is integrated by integrators 23 and 24 in the intervals of the corresponding sequences, and the measured integration results, combined into one channel by adders 25 and 26, are then squared

Claims (2)

by squares 28 and 29, respectively, the square root of the converter 30 is extracted in pairs by the adder 26. Thus, at the output of the transformer, the JT T7 / -H | ПС1ПЛП-гт Т1, г ,,. . "N" "", equal to the duration of the element of the noise-like signal, the values of the quadrature correlation function (CCVF) of the input signal and the copy of the noise-like signal appear. At the moment when one of the FCC values exceeds a certain threshold of the threshold unit 31, the second synchronization stage begins, during which a parallel exact noHicK is generated for the signal delay inside the CCFR signal peak. In this case, the manipulating pseudo-random sequences are shifted among themselves by discrete, determined by the duration of the element of the noise-like signal and the number of parallel channels. In the third stage, the phase self-tuning of the frequency is performed with the help of the block 33 for searching and adjusting the frequency. The synchronization mode ends when the applied sequence of noise-free signals coincides in time with the operation of the first channel of the receiving part of the system, and generator 4 is synchronized to phase with the carrier frequency of the noise-like signal. In the information transfer mode, the signals are delayed by a certain number of elements in accordance with the information, ion codes, as described above. At the same time, the maximum response exceeding the threshold of the pore block 31 is formed in the corresponding delay: the receiving channel's M channel and is fixed at the output of the corresponding element Id 17 by means of a switch 16 operating synchronously with the channels. If now the outputs of the elements And are connected to the decoder, then at its output, in the absence of interference, a code will be generated corresponding to the information code received at the input of the transmitting part of the system. Thus, the proposed communication system provides for transmission and reception of multi-position noise-like signals with fast synchronization and with high noise immunity, due to radio-frequency correlation processing of the noise-like signal — in general, and coherent reception. The shift of the second second sigpal in the TC / 2 phase, which carries oscillations with respect to the first one, and the corresponding coherent reception eliminates the effect of the partial temporal superposition of two consecutive signals. Claims of the communication system with a temporal compression of noise-like signals, comprising on the transmitting side an information source, a clock generator, a pseudo-random sequence generator, a switch and a carrier frequency generator, the output of which is connected via one modulator to one input terminal of the output matching unit, on the receiving side the matching unit and the recipient of information, characterized in that, in order to increase the speed of information transfer, a matching block, a counter, a trigger, as well as series-connected additional pseudo-random pseudo-sequence generator, modulator and delay element, with one input of the matching unit connected to the information source outputs and the other inputs to counter outputs, one of which is connected via a trigger to one input of the switch, another input which is connected to the output of the coincidence unit, the first and second outputs of the switch are connected respectively to the inputs of the main and additional pseudo-random sequence generator, and the output the delay element is connected to another input of the output matching unit, and a multichannel correlator, switch and elements I are inserted at the receiving side, and the output of the input matching unit is connected to the switch input through the multi-channel correlator, the outputs of which are through corresponding elements AND, other inputs which are connected to the corresponding output of the multichannel correlator, connected to the inputs of the recipient of information. 2. The system of claim 1, wherein the multichannel correlator comprises two semi-knives integrated in the input, the outputs of which are connected to the inputs of the modulator, one outputs of which through the first integrators are connected to the inputs of the first adder, the other outputs through the second the integrators are connected to the inputs of the second adder, the outputs of which are connected to the third adder through matching quadrants, the output of which is connected to the input of the control unit through the series-connected converter and the threshold unit, the outputs otorrhea respectively connected to the control input yuschpm modulator drzgim threshold input block and the search block and through frequency control - a control input of the carrier generator. The source of information taken into account during the examination: I. USSR Copyright Certificate 478449, cl. H 01 5/12. 1973.