SU1699007A1 - Device synchronizing meteor communications system - Google Patents

Abstract

The invention relates to telecommunications and can be used in the clock synchronization systems of meteoroid systems for the transmission of discrete information. The aim of the invention is to improve the synchronization stability to the distortions of the DRC type. that sets the generator 7, the third element AND 8, the encoder 9, the reversible counter 10, the decoder 11, the counter 12, the first element OR 13, the fourth element AND 14. the second element OR 15, the delay element 16, the fifth element AND 17, the second element prohibition 18, the element or 19, the essence of the invention consists in the fact that spinning operations majority codes temporary storage position information of significant moments of synchronization sequences vyshaets resistance to the effects of random errors as crushing. 2 Il. &

Description

ABOUT

yu o about o

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The invention relates to telecommunications and can be used in the clock synchronization systems of meteoroid systems for the transmission of discrete information.

The purpose of the invention is to improve the synchronization resistance to distortion type crushing.

Fig. 1 shows a structural electrical circuit of a synchronization device of a meteor communication system; in fig. 2 is a timing diagram of its operation, i. The synchronization device of the meteoric communication system contains a unit 1 for knowledge of knowledgeable factors, the first trigger 2, the first element I 3, the first element 4 prohibitions, the second element I 5, the divider 6 into two, for the generating generator 7, the third element AND 8, the encoder 9, the counter counter 10, the decoder 11, the counters 12, the first element OR 13, the fourth element g AND 14, the second element OR 15, the delay element 16, the fifth element AND 17, the second prohibition element 18 and the third element OR 19.

The synchronization device of the metzor communication system operates as follows.

The information pulse sequence is fed to the input of the significant moments extraction block I (Fig. 2aj, which highlights the significant moments of the information signal (Fig. 26). If there are distortions like splitting in the information signal, the crushing output of block 1 appears (false Fig. 2a, 5). Suppose that the moment of the beginning of the reception of the information signal does not coincide with the significant moment of the reference pulse sequence (Fig. 2i), i.e. there is a synchronization error (Fig. 2, moment A). To the input of the direct reversible counter accounts and 10 through the open first element I 3 the first trigger 2 in the initial state is at zero, pulses start to come from the output of the master oscillator 7 (Fig. 2c). At the outputs of the reversing counter 10 the time position codes appear. (Fig. 2c, d, e). At the moment when the envelope of the input information signal passes through O (the significant moment of the sequence), a short pulse arrives at the output of block 1 and arrives at the enable input of the decoder 11 through the open fifth element I 17 in the original state, second trigger 20 is in the unit state and at its input of the installation 1 pulses come from the output of the master oscillator 7, confirming the initial state. The inputs of the decoder 11 receive the temporary position codes from the outputs of the reversible counter 10, which are decrypted when a significant moment appears fig 2h). At the corresponding output of the decoder 11, a short pulse appears, which is recorded in the corresponding counter 12 (Fig. 2i - p). The capacitance of the counters 12 is selected based on the interference conditions (in this case, the capacitance of the counters is four). At the end of each cycle of operation of the reversible counter 10, a short impulse appears at its output of direct transfer (at the moment of code 111) (Fig. 2a),

5 In the next cycle of operation of the reversible counter 10, at the output of block 1, pulses of significant moments of the input information signal appear again, under the action of which the deciphering occurs. codes of their temporary position and counting the number of identical codes in the slips 12, to avoid re-decrypting one code during short crushing (the fractional distortion duration from the output of the fifth element 17,

0 which is closed by a zero potential from the output of the second trigger 20 and prevents the passage of subsequent pulses from the stroke of block 1 to the enable input of the decoder 11. Unlocking the second trigger

5 20 is carried out by the next master pulse coming from the output of the master oscillator 7 to its input of the installation O. Since the significant moments from the fractionals appear at random moments

0 time, and from information transitions at the same moments (Fig. 2h), then the first counter overflows 12, in which the codes corresponding to the information transitions are counted.

5 (in this example, the counter 12 with the sequence number 7 of Fig. 2h, since the number, synchronization errors are 011).

If one of the counters overflows

12 (first overflow) at the output of the first element OR 13 see the unit

by gencial (fig. 2c), under the influence of which

closes the first element 4 of the singing and

synchronization device is blocked

(the second trigger 20 remains in the zero state after the last pulse of significant

Mopenta overflow counter 12).

Encoder 9 in accordance with the signal on

 W3 inputs its binary

Chod (in this example, 011), .-. which pod8 with the inputs of the reversible counter 10

At the end of the cycle of operation of the reversing counter 10, a short pulse appears at its direct transfer output, which passes through the open fourth And 14 element to its pre-recorded input. As a result of this, in the reversible counter of 10 lz of the encoder 9, the cc synchronization error is rewritten. In this case, the code is 011, i.e. six dollars of a single element.

Since the code is written to the reversible counter 10 at the last clock of its operation, i.e. when the state of the counter is 111 (Fig. 2c, d, e), then in the next cycle, instead of the state 000, the reversible counter 10 is in the state 011, therefore, the output of the second element OR 15 remains 1 (Fig. 2u) and pulse c the output of the fourth element AND 14, delayed by the delay element 16 at the transient time in the reversible counter 10, passes through the open third element AND 8 to the input of the installation 1 of the first trigger 2. The latter is transferred to a single state (Fig. 2e).

The first element And 3 closes, the second element 5 opens. The pulses from the output of the master oscillator 7 begin to arrive at the input of the reverse reversible counter 10 (Fig. 2x) through the open second element AND 5. The synchronization error correction mode starts with the value of b of the elementary parcel. After the passage of six pulses, a pulse appears at the return counting input of the reversible counter 10 at its reverse transfer output (fig. 2g), under which the first trigger 2 is set to the zero state, and all information recorded in the counters 12 is erased.

The first prohibition element 4 is opened by the first pulse, which came through it from the output of the master oscillator 7, the second trigger 20 is set to one.

Beginning, a new cycle of measuring the temporal position of the significant moments of the input sequence of information pulses.

In the next measurement cycle, code 000 accumulates faster, so that the synchronization error was eliminated in the previous cycle (Fig. 2h). Therefore, an overflow pulse appears at the output of the first counter 12, and the code 000 is present at the outputs of the encoder 9.

As before, the first prohibition element 4 and the second trigger 20 are blocked. At the last clock of the reversible counter 10, the code 000 is written into it,

therefore, O is present at the output of the second element OR 15 (Fig. 2y). The pulse from the output of the fourth element AND 14 passes through the delay element 16, through the open second prohibition element 18, through the third element OR 19 to the inputs of the installation O of the counters 12, in which the information is erased. In this cycle of operation, the synchronization error correction is not

0 is required (Fig. 2h).

All items are unlocked and a new cycle of the synchronization device begins.

Claims (1)

Invention Formula 5 A synchronization device of a meteor communication system containing a counter for significant moments, whose input is an input of the device, specifying a generator, the output of which is connected to the first 0 and second inputs of the first and second elements, the outputs of which are connected to the forward and reverse counts respectively reversible counter, the output of the reverse transfer of which is connected to the input of the installation O of the first trigger, the direct and inverse outputs of which are connected to the second inputs of the second and first elements AND, 1 during installation in the first-trig ERZ connected vy0 move the third AND gate, to the first input of which through the first OR gate outputs are connected down counter, the output of the most significant bit down counter is connected to the input of divider 5 for two, the output of which is the output of a device characterized by heme, which, with the aim of increasing the stability of synchronization to distortions such as crushing, c. he entered (p-1) counters, the fourth and, 0 fifth elements And, the second trigger, the first and second elements of the prohibition, the second and third elements OR, the encoder, the decoder and the delay element, the input to which and the pre-recording entry reversing 5 of the counter is connected to the output of the fourth element And, to the first input of which is connected the output of direct transfer of the reversible counter, the outputs of which are connected to the information inputs of the decoder, 0 while the output of the master oscillator through a serially connected first element g of the prohibition and the second trigger is connected to the first input of the fifth element I. To the second input is a cathode, the output of the block is connected 5 highlighting of significant moments, and the output of the first element I is connected to the installation input to the second O-rigger and the enabling input of the decoder, the outputs of which are connected to the inputs n of the counters whose outputs are connected to the inputs of the second element OR through the encoder to the inputs of the reversible-connected to the inverse input of the first elenO counter, the output of the reverse transfer of the prohibition and the second input of the fourth which and the output of the second element of the prohibition element I, and the output of the element of delay are connected to the first and second inputs and connected to the second input of the third electric element OR, the output of which is 5 And and to the input of the second prohibition element, connected to the inputs of the installation in O p counters, and the output of the second element OR the inverse input of which is connected to the output of the first element OR. Iakazheuts mu.ua „Aro & enae