RU2007883C1 - Device for automatic synchronization of clock speed - Google Patents

Abstract

FIELD: radio engineering. SUBSTANCE: device has devices 1 for time and frequency signal transmission, devices 2 for testing television time and frequency signals. In addition device has receiving-registration unit 3, time interval meter 4, alphanumeric printing device 5, time signal generation unit 6, correction signal generation unit 7, phone communication channel 8, calculating device 9 for calculation of correction for clock speed difference, parallel input/output interface controller 10, selector-multiplexer 11, first and second n-bit registers 12, 13 providing parallel input of information, unit 14 for digital comparison, current time code generator 15, counter 16 which divide by M, RS-flip-flop 17 and matching unit 18. EFFECT: increased functional capabilities. 1 dwg

Description

 The invention relates to radio engineering and can be used in systems of high-precision synchronization of spatially separated time scales.

 The purpose of the invention is to improve the accuracy of synchronization of the time scale of the transmitting telecentre (PTC).

 The drawing shows a functional structural diagram of a device for automatic synchronization of the time scale of a transmitting telecentre.

 The device comprises apparatus 1 for transmitting time and frequency signals (PTC) 1, apparatus 2 for monitoring television signals of time and frequency. The device includes serially connected receiving and recording unit 3 and a measuring device 4 time intervals, as well as an alphanumeric printing unit 5, a unit 6 for generating time signals, a unit for generating correction signals 7, a channel 8 for a telephone communication line, a calculator 9 for correcting the divergence of time scales , parallel I / O interface controller 10, selector-multiplexer 11, first N-bit register 12 with parallel recording of information, second N-bit register 13 with parallel recording of information, block 14 is compared I numbers, code generator 15 the current time, the counter-divider 16 M, RS-trigger 17, coincidence unit 18.

 The device operates as follows.

 Signals of time 1s and a reference frequency of 1 MHz are transmitted as part of a television signal using the PTC 1 equipment. This signal is received by the receiving-recording unit 3, which is part of the apparatus 2 of the television signals of time and frequency. Block 3 from the video signal extracts time signals 1 s and packets with a reference frequency of 1 MHz, feeds the meter 4 to the first input ("start"), and signals of the reference time scale that come from block 6 through the block are fed to the second input ("stop") 18, which acts as a temporary key. It passes the second signals of the scale to the input of the meter 4 only in that time interval, which is determined by the counting time M second pulses by the counter-divider 16. The start of the measurement time is set programmatically. Using the calculator 9 is written in the register 13, the specified time code. When this code coincides with the current time code, the block 14 taken from the shaper 15 generates a pulse that opens the RS flip-flop 17 and starts the measurement cycle on the meter 4. The results in a code form from the output of the meter 4 are read through the selector-multiplexer 11 to the parallel input interface controller output 10, are processed in the calculator 9 according to the algorithm below and are recorded on an alphanumeric printing unit 5.

 The algorithm of operation of equipment 2 under the control of the calculator is as follows.

Enter the system input parameters: current date, device operation mode, etc. The start and duration of each measurement cycle on the time interval meter is set by the installation program, for example 59 ^m 00 ^{s of} certain hours of the day.

Several control cycles were established during the day, for example, 7 ⁿ 59 ^m 00 ^s -8 ^h 00 ⁿ 00 ^s , 10 ^h 59 ^m 00 ^s -11 ^h 00 ^m 00 ^s , 17 ^h 59 ^m 00 ^s -18 ^h 00 ^m 00 ^s ,
-20 ^h 59 ^m 00 ^s -21 ^h 00 ^m 00 ^s . The duration of each cycle is 60 s.

 The first 10 s is measured in the operating mode of the device "1 MHz". The measurement results are read and stored in the calculator. In the next 10 s, n measurement results are read in the "1 Hz" operating mode, and during the next 10 s - n measurement results in the "insert" operating mode.

Then, in the same way, the measurements described above are made on another channel of television broadcasts. The measurement ends with 00 ^m 00 ^{s of the} next hour.

 Next, the calculator goes into the program of mathematical processing of the measurement results.

, где j - режим измерения j = 1-3;
τ_ij- i -й результат измерения;
2) корреляционный анализ результатов измерения, оценка величины случайных погрешностей
σ_j=

3) прогнозирование величины корректирующей поправки

= a_j+b_jt
a_j - результат предыдущего цикла измерений;
b_j - коэффициент, характеризующий ход часов на ПТЦ;
t - интервал времени между предыдущим и настоящим циклом измерений.The calculations are as follows:
1) calculation of the statistical average
τ _j =

where j is the measurement mode j = 1-3;
τ _ij is the i-th measurement result;
2) correlation analysis of measurement results, estimation of random errors
σ _j =

3) prediction of the magnitude of the correction

= a _j + b _j t
a _j is the result of a previous measurement cycle;
b _j - coefficient characterizing the course of hours at the PTC;
t is the time interval between the previous and the present measurement cycle.

- τ_j≥3σ
5) вычисление величины поправки на расхождение шкал времени на ПТЦ.4) determination of erroneous results

- τ _j ≥3σ
5) the calculation of the magnitude of the correction for the divergence of time scales at the PTC.

-τ_p-τ₃±τ_px, где

- результат измерений,
τ_p - время прохождения сигналов от антенны передатчика ПТЦ до антенны температуры контроля;
τ₃ - задержка сигнала в аппаратуре контроля;
τ_px - поправка на шкалу рабочего хранителя относительно шкалы времени UTC (SU).Δ _j =

-τ _p -τ ₃ ± τ _px , where

- measurement result,
τ _p is the transit time of the signals from the antenna of the PTC transmitter to the antenna of the control temperature;
τ ₃ - signal delay in the control equipment;
τ _px - correction to the scale of the working keeper relative to the time scale UTC (SU).

 Based on the results of the mathematical processing of information, the calculator determines the correction for the discrepancy of the time scale at the PTC relative to the reference time scale. The value of this correction is written in code form to the first register 12. Information from this register is converted to a correction signal and in block 7 and transmitted to the channel of the telephone line 8 to correct the phase of the 1 MHz signal and the moment of 1 second signal output from the antenna of the transmitting television and radio station PTC.

 The reference time signals are fed through block 18 to meter 4, simultaneously fed through shaper 15, selector-multiplexer 11 and calculator 10 to register 12 and block for generating correction signals 7. This ensures synchronous operation of the device and synchronous generation of corrections in real time relative to the time scale and leads to an increase in the accuracy of linking the PTC timeline to the reference timeline. (56) Copyright certificate of the USSR N 1066435, cl. H 04 L 7/08, 1980.

Claims (1)

 DEVICE FOR AUTOMATIC SYNCHRONIZATION OF THE TIME SCALE of a transmitting telecentre, which contains equipment for transmitting time and frequency signals and control equipment for television signals of time and frequency, which includes a series-connected reception and recording unit and a time interval meter, as well as a unit for generating time signals and a unit for generating correction signals and a communication channel, characterized in that, in order to improve the accuracy of synchronization of the time scale of the transmitting telecentre, the role of television signals of time and frequency are introduced in series-connected selector-multiplexer, a parallel I / O interface controller, a time scale difference correction calculator and an alphanumeric printing unit, as well as first and second N-bit registers with parallel recording of information, a number comparison unit, current time code generator, counter-divider by M, RS-trigger and coincidence unit, and the communication channel is made in the form of a telephone communication line, while the first, second and third outputs of the controller are inter the parallel I / O interface is connected respectively to the control input of the selector-multiplexer, to the inputs of the first and second N-bit registers with parallel recording of information, the output of the first N-bit register with parallel recording of information is connected to the input of the correction signal generation unit, the output of which is connected to the input of the channel of the telephone line, the output of which is connected to the input of the equipment for transmitting signals of time and frequency, the output of the second N-bit register with parallel recording of information nen with the first input of the number comparison unit, the second input of which is connected to the first output of the current-time code generator, the input of which is connected to the first output of the time signal generating unit, the second output of which is connected to the first input of the coincidence unit, the second input of which is connected to the output of the RS-trigger , the first output of the coincidence unit through the counter divider by M is connected to the R-input of the RS-trigger, the S-input of which is connected to the output of the number comparison unit, and the second output of the coincidence unit is connected to the second input of the interval meter s time, the output of which is connected to a first data input selector multiplexer, a second data input which is connected to the second output of the current-time code.