SU1374172A2 - Device for synchronizing time signals - Google Patents

Abstract

Invention m. used in the construction of systems for transmitting time signals over communication channels. The purpose of the invention is to improve the accuracy of synchronization of time signals of a syncro station. Using the displacement zone generator 13, the discrepancy of the scales is carried out when the propagation delay of the signals is changed due to the replacement of the communication channel or the insertion in it. The time signals received from the synchronization station will fall into one of the divergence zones, and they arrive at the input of the counter 17 through the element 15 at the input of the counter 17. When it is filled, an impulse signal is generated at its output, which passed the element 19 and enters the trigger input 16 and set it to a state in which the scale divergence indicator 20 registers the time scale divergence of the time signal sensor 8 with the scale received from the sync station, and through the element 21 it allows the signal to pass to the inputs OR 2 coagulant device 4 controlling reception. By this signal, the trigger 5 and the sensor 8 of the time signals are returned to the initial state. A propagation delay measurement request code is transmitted to the clock station side. Upon reception of such a signal, the synchronization station re-measures the signal propagation delay in the communication channel and the shift of the transmitted signal in the direction of advance by a newly measured value. 1 il. with- € (L 00 yu N)

Description

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The invention relates to devices for synchronizing time scales, can be used in building systems for transmitting time signals over communication channels, and is additional to the main one by author. No. 1167577.

The aim of the invention is to improve the synchronization accuracy of the time signals of the synchronized station.

The drawing shows a diagram of this device.

The time signal synchronization device. Contains a signal conversion unit 1, an element OR 2, a counter 3, a reception control unit 4, a trigger 5, an OR element 6, an AND 7 element, a time signal subscriber sensor 8 (ADSV), a reference generator (OG) 9 , correction unit 10-, trigger 11, element I 12, shaper 13 divergence zones, elements AND 14 and 15, trigger 16, counter 17, amplifier 18, element 19, discrepancy indicator 20, element 21.

In order to provide optical signaling of the discrepancy between the ADSB scale and the scale received from the synchronization station, a well-known amplifier 18 and an indicator 20 are introduced into the device.

The device time synchronization works as follows.

At the moment of switching on, the initial setup pulse is supplied to the

The inputs of the imaging unit 13 of the divergence zones, the counter 17 and the trigger 16, and through the element OR 2 to the installation inputs of the trigger 5 and the ADS 8. At the same time, the device is reset to the initial condition when the following conditions are met signals through the element And 7 allowed-receipt of signals in the correction unit and the output of signals ADSV 8 to the consumer is prohibited; passing signals through element 21 is prohibited; the counter 17 and ADSB 8 are set to zero, and the diverter 13 is set to its initial state} potential 1 arrives at the input of amplifier 18 (indicating a discrepancy of the scales), which from the amplifier output enters the divergence indicator mKaJl 20.

When a time signal is received from the sync station, the time signal is shifted towards the standard relative to the standard by an amount equal to the delay

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propagation of signals in the communication channel, the ADSB 8 is synchronized by resetting all bits of its divider to the zero state (the period of the signals at the main output of the ADSV is equal to the period of the reference time signals). The received pre-empted signal through the And 7 element enters the control input of the trigger 5 and sets it to a state in which the ADSB 8 scale is allowed to the consumer, the arrival of the received time signals to the correction unit 10 and the passage of the signals through the And 21 element.

After the synchronization moment, the instability of the ADSV scale is determined by the instability of the exhaust gas and the relative deviation from the nominal frequency of the reference oscillator at the synchronized station. Accepted signals are received through the information input to correction unit 10, and potential signals from the output of the counting trigger 11 arrive at its control inputs, to the input of which impulse signals come from the output of the ADSB 8. The tracking signal output period of the trigger 11 is equal to the pulse following signals at the main output of ADSV. By means of the correction unit 10, the phase correction of the ADSB signals 8 is performed throughout the entire communication session.

With the help of the generator 13 of the zones of divergence, the registration of the divergence of the scales is observed when the delay of signal propagation changes due to the replacement of the communication channel or the insertion in it.

After synchronization, the ADSB signals received from the synchronization station practically coincide with the ADSB signals. And they do not fall into the divergence zones, therefore, through the AND 14 element, these signals arrive at the first setup input of the trigger 16 and set it to the state where it is. The output signal O is generated, which is fed through the amplifier 18 to the input of the indicator 20 for discrepancies of the scales. At level O there is no signaling of discrepancy of the scales.

When replacing a communication channel or organizing an insert in it, the propagation delay changes and time signals received from the synchronizing station fall into one of the divergence zones, therefore, through element 15 they arrive at the input of counter 17. When the counter is filled, a pulse signal is generated at its output which passes through the element I 19, enters the counting input of the trigger 16 and sets it to the state in which the scale divergence indicator 20 registers the discrepancy between the time scale of the ADB and the scale received from the synchronizer guide station, and through AND gate 21 is allowed to pass the signal to the additional inputs of OR 2 and the reception control unit 4. By this signal, trigger 5, ADS 8 returns to its original state. In this case, the code combination of the propagation delay measurement request signal is transmitted to the synchronizing station instead of the code combination of the anticipated signal.

Upon reception of such a signal, the sync station re-takes the measurement of the propagation delay of the signal in the communication channel and the shift of the transmitted signals towards the forward side by the newly measured value. When receiving an anticipated signal at the synchronized station, the ADSB is re-synchronized. Thus, the elimination of the error caused by a change in the propagation delay due to the replacement of the communication channel or the insertion of an insert in it is carried out.

In the absence of the specified set of control and recording elements, the discrepancy of the scales, caused by the replacement of the communication channel or the organization of the insert in it, is compensated by auto-tuning the ADS 8 scale according to the signals of the synchronizing station. .

The signals received from the synchronization station are received through the element OR 6 at the installation input of the counter 3 and prohibit the counting of pulses from the ADP 8.

In the event of a communication channel failure, the reception of signals from the synchronization station is interrupted, the phase correction of the ADSB signals 8 is terminated, therefore the error in the ADSB time scale due to instability and frequency deviation of the reference oscillators accumulates. When this occurs, the filling of the counter 3, as a result

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which signal from its output through the element OR 2 is fed to the setup input of the trigger 5 and sets it to its original state. By the same signal, the ADSB control circuit 8 is returned to the initial state, i.e. ADSB is ready to resynchronize when the link is restored. Thus, it is prohibited to consumer the time scale, the error of which exceeds the permissible. The value of the permissible error is determined by the capacity of the counter 3.

Claims (1)

Invention Formula The device of synchronization of time signals according to auth.St. No. 1167577, due to the fact that, in order to improve accuracy, the third, fourth, fifth and sixth elements AND, the third trigger, the second counter, the divergence zone former, the amplifier and the divergence indicator, the first OR element and the block are entered into it. the reception control is made with an additional input, and the user time signal sensor has two additional outputs, the first input of the diverter zone generator is connected to the output of the correction unit, the second and third inputs are connected to the additional outputs of the subscriber sensor time, and the fourth input - to the installation input of the second counter, to the second installation input of the third trigger and to the first input of the first element OR, the first output of the diverter zone generator is connected to the first input of the third element And whose output is connected to the first installation input of the third trigger, output from the sixth element I connected to the first input, and through an amplifier with a discrepancy indicator, the second output of the diverter zone former is connected to the first input of the fourth element I, and the second input connected to the second input of the third, fifth, sixth elements I and the output of the reception control unit, the output of the fourth element I is connected to the input of the second counter, the output connected to the first input of the fifth element I, whose input is connected to the counting input of the third trigger, third 513741726 the input of the sixth element And is connected to the control unit for receiving and the first second output of the first trigger, and the ° element OR. output connected to additional inputs