SU1644079A1 - Method for time scales comparison and device thereof - Google Patents

Abstract

The invention relates to radio engineering and can be used in synchronization systems of spatially independent time scales over channels with varying propagation time. The aim of the invention is to improve the accuracy of comparison of time scales. A device that implements the method of comparing time scales contains clock 1 on the master and slave points, a converter of 2 clock signals into a radio signal, a driver 3 of control signals, a dividing unit 4, a selector 5

Description

thirty

35

The invention relates to radio engineering and can be used in synchronization systems of spatially independent time scales over channels with varying signal propagation time.

The aim of the invention is to improve the accuracy of comparison of time scales.

FIG. Figure 1 shows a timing diagram of the signals, explaining how to compare time scales; in fig. 2 is a block diagram of an apparatus for implementing a method for comparing time scales; in fig. 3–5 respectively, the structural electrical circuits of the driver of the control n signals, the selector of start pulses and the signal former Correction Signal.

The device for comparing time scales contains on the master and the slave points clock 1, a converter of 2 clock signals into a radio signal, a driver of 3 control signals, a dividing unit 4, a selector of 5 trigger pulses, a unit of 6 generating time scale signals, a determinant of 7 time intervals, the selector 8 of the received clock signals, the additional determinant of 9 time intervals, the shaper 10 of the signal Correction sign and the converter of the radio signal 11 into the clock signals.

Clock 1 contains the generator 12 of the reference frequency, the corrector 13 signals of time scales and the divider 14 frequency.

50

55

0

five

five

P

0

five

The time signal generation unit 6 comprises a driver 15 of the reference time scale and a driver 16 of the measuring time scale.

The driver 3 of the control signals contains an RS flip-flop 17, a delay block 18, first and second elements AND 19 and 20, and a counting flip-flop 21.

The selector 5 start pulse contains the element And 22, RS-flip-flop 23, the divider frequency 24 and the element OR 25 6

Shaper 10 signal Sign of the amendment contains the first elements OR 26 and AND 27, the first and second blocks 28 and 29 delay, RS-flip 1 30, the second elements AND 31 and OR 32, the adder 33 and the converter 34 signal level.

The essence of the method for comparing time scales is as follows.

The time of propagation of the signal to the forward - from the leading point (A) to the slave point (B) and, in the reverse - from the slave point (B) to the leading point (A) is taken to be the same and equal to Q, (Fig. 1). The propagation time of the re-emitted signal is also considered to be the same in both directions, but differs by ty from the propagation time of the main signal (initially emitted) due to the displacement of the reflector.

Master and slave items work the same. In the master and slave points for a single measurement period, consisting

Four pulses emit from four cycles (pulse 1 is blackened at rig 1), four pulses are received (they have the smallest height in Fig. 1), time-reference pulses are generated twice (hatching in Fig. 1) and measurement time-scale pulses (in Fig. 1 shown by a thin line),

LET THE INITIAL NON-VISITIVE SHEAR

the time scale of the slave point B relative to the leading point A is equal to v.

The first signal of the main time scale is emitted in the master and slave points, respectively, at times

 ABOUT

and

BpE

 V.

The first signal of the main time scale is taken in the master and slave points at the - time points

where Y is a time error caused by a change in the propagation time over the radio channel due to a shift of the reflecting object.

The time position of the time scale in the first cycle for the driving and driven points is respectively

2T

and

-ish

 2T + V,

In the master and slave points, the temporary position of the second received signal of the main time scale relative to the measuring time scale is measured. At the same time receive respectively

and

W, - v.

t лр, 0 + v

Received first primary signals

The time scales are ahead of the impulse of the reference time scale, which is delayed by T relative to the main time scale (local) at the master and slave points, respectively, by time.

t. T - (0 + v) and tL -T- (0-v).

uont

-on,

After a delay time equal to the master and slave points, respectively, according to the lead time of the first 35 signal received on the main time scale of the time reference signal

 t

on

and

Hall

op

re-emit a signal. The moment in time, at which the radiation is emitted: of the second signal of the main time scale, is equal respectively for the master and slave points

tn32 bp32

 T + tMni - 2T- (0 + v); T + v + tWf)) 2T + v- (0-v).

The second signals of the main course are received at the leading points respectively

BUT

,R

.

  pe2 + c + taA92 + 6 + f

In the master and slave points, the amendment is determined, by which the time scales (main, reference and measuring) are corrected:

  A uf / 4 /

From the master and slave items emit the third signal of the main time scale at the moment of time.

And SpE,

ZT + D ZT + | + Ј

 + I +

Corrected time scales

leads to their combination

The third signal of the main time scale is received simultaneously in the master and slave points through time 9, which is the change in the propagation time:

4 -tVe is at,

Р, - „V 0 tm + +0 (

The third signal is the main time scale,

received at the master and slave points, ahead of the signals from their reference time scales, respectively, by

55

 OflЈ

t-d1 t6 t-1 and 1 gopg L v

Select the delay time of the radiation of the fourth signal of the main scale

time relative to the signals of the reference time scale for the master and slave points, respectively, equal to the lead time by the received third signal of the main time scale relative to the signal of the reference time scale:

A a

-edp a

Tb;

 ton 2.

t-talifc

one

The fourth signal of the main time scale in the master and slave points emit simultaneously at the moment of time

Ahh

one

 t

CE

+ T + t

zap4

If

20

v V l ST + 2 + F 9;

CH4 - P89 + T + tin2

„ST + f + frO1.

The fourth signal of the main time scale is received through time 0 + v also at the same time in the master and slave 25 points:

PR4 + -5T + I + I + V; 30

 5T + I + + V.

The position of the time scale 35 in the master and slave points is the same:

A A ISH2 2T

 No. With V2T

.

The temporal position of the fourth signal of the main time scale relative to the signal of the measuring time scale is measured; as a result, for the master and slave COOT-JQ points are received

According to the results of two measurements, the time scales are shifted between the master and slave points.

l7 l A A

AV L - Yes - 2v;

&; l -2v.

Last expressions

de

,

0

five

0

five

0

five

0

five

Q

five

that there is a double shift in the received signals of the main time scales relative to local time scales: the slave point scales are late by the value of v relative to the scales of the leading point and, conversely, the scale of the leading point is ahead of the scale of the driven point by the value v, as indicated by the minus sign D. values.

After determining the result of the comparison of the time scale in the master and slave points, they return to their original state (by shifting in the direction of advance), to compensate the introduced amendments D and D.

The device for comparing time scales works as follows (the master and slave items work identically).

The generator 12 (Fig. 2) generates a periodic sequence of pulses with a high frequency (for example, 5 MHz). The corrector 13 in the initial state is not amended. The divider 14 at the first output produces a periodic sequence of pulses with a period T and a frequency having a low value (for example, 600 Hz), and at the second output also with a low frequency (for example, 100 Hz). The frequency of comparisons is determined by the frequency of the pulses at the second output of divider 14 emitted from. the output of the Converter 2 (the first blackened signal in figure 1).

The selector 5 provides a device for comparing time scales in two cycles. At the same time, at its first output, start-up pulses appear at time points 0 and 3T + D c on the local scale, starting up the shaper 15, on the second and third outputs of the selector 5, the start-up pulses act on the ST + Dz time of starting the shaper 3 and converter 2.

The pulses from the second output of the divider 14 set the RS flip-flop 23 of the selector 5 (FIG. 4) to one state, make the initial setting of the divider 24 (three) and through the OR 25 element go to the first output of the selector 5.

Impulses with a repetition period T from the first output of the divider 14 act

y16

are on the selector input, i.e. To the second input of the element I 22, and in view of the fact that the permitting voltage from the direct output of the RS flip-flop 23 acts on its first input, it passes to the input of the divider 24, which ensures the appearance of a pulse at the output after 3T + D And to. Correction, entered into the time scale on the interval between tnp and ST. The impulse from the output of the divider 24 sets the RS flip-flop to the zero state, which stops the passage of signals through the AND 22 element and prevents the formation of the trigger signal on the inverse output of the RS-flip-flop 23. Orientation of radio communication between the master and the slave items, the converter 11 detects the clock signal and, through the selector 8, starts a direct {counting of the determiner of 7 intervals (reversible interval meter), which measures the time of the advance by the received signal of the main time scale relative to the signals of the reference time scale ( local). The signal from the imaging unit 15 stops the forward counting of the determinant of 7 intervals and transfers it to the countdown mode. When the readings of the 7 interval determinant become zero, the converter 2 is started.

Delayed re-radiated signal

hours, received by the converter 15, through the selector 8 enters the first 35 input of the imaging unit 10, the second input of which receives a signal from the output of the imaging 16, delayed relative to the signal of the main time scale (local) by 2Т.40

The shaper 10 generates start and stop pulses to control the operation of the additional determinant 9 intervals and the pulse sign, which can be used for register-5 mandates to perform division and cortex of the comparison result sign with a corresponding external recording device, as well as setting the necessary correction sign entered into the CQ 13. corrector. If the signals from the driver 16 and the selector 8 do not coincide in time, the first of them, which appears at the output of the first element OR 26 (figure 5), performs the start of the additional determinant 9, and the second signal from the selector 8 stops it. The first signal sets the RS trigger 30 to one state,

YU

0

five

50

0

50

As a result, a stop signal is generated at the output of the second element OR 32. The pulse from the RS flip-flop 30 through the converter 34, which biases the signal into the region of negative levels, goes to the adder 33, which is also followed by the signal from the driver 16. the input of the converter 11, the signal Sign (1) is formed at the output of the adder 33, otherwise the signal at the third output of the driver 10 corresponds to the signal O, the Stop signal from the output of the second element OR 32 through the second block 29 rzhki sets the RS-trigger 30 to its original state, and the driver 10 is ready for re-use.

The first element 27 and the first delay block 28 ensure the normal operation of the additional determiner of 9 intervals while the signals from the generator 16 and the selector 8 arrive simultaneously. In this case, the stop signal is a pulse from the output of the first element 27 that is delayed by the first block 28 of the delay time processes in the additional determinant of 9 intervals.

The additional interval determiner 9 measures the time position of the second received signal of the main time scale relative to the measuring time scale and the time position of the fourth received signal of the main time scale relative to its measuring time scale.

Shaper 3 (FIG. 3) controls the operation of dividing unit 4 (four), in which the value of the correction to the time scale,% and offset 13 is determined, producing signals that serve as correction, sets the required correction sign.

The signal from the second output of clock 1 sets the RS-flip-flop 17 to the one state and the counting flip-flop 21 to the zero state. At the same time, on the direct and inverse outputs of the counting trigger 21, pulses are produced corresponding to the initial state of the sign of the correction — the minus sign. If the true sign of the correction is positive, then a signal appears Sign from the driver 10. Through the second element AND 20 signal Sign

arrives at the S-input of the counting trigger 21. The command to perform the division is the signal at the direct output of the RS-flip-flop 17. The pulse from the inverse output of the RS-flip-flop 17 is fed to the first input of the first element And 19, ensuring the passage of the second Stop signal to the counting input the counting flip-flop 21, causing it to overturn and changing the sign of the correction to the opposite to restore the original position of the time scale of the clock.

The absolute value of the correction in the binary interval, which determines the temporal position of the received second signal of the main time scale of the driven point relative to the signal of the measuring time scale of the leading point D, characterized in that, in order to improve the accuracy of the comparison of the time scales, the first corrections in the leading and driven points respectively, to the time scales of the master and slave items, using the formulas A / 4 and D / 4, phase correction of the main, reference and isic code is performed by block 4 of the time scale 15. and magnitude

nor, for example, by shifting a binary word by two bits.

Claims (5)

1. The method of comparison of time scales, which consists in the fact that in the master and slave points form the signals of the main time scales and signals reference timescales delayed by a relative 25 but the signals of the main time scales, and the signals of the time scales, delayed relative to the signals of the reference scales, transmit the first additional signal of the main time scale of the leading point relative to the signal of the reference time scale of the slave top, in the radio channels of the first signals of the main-next point is determined and registered time scales and receive the transmitted first signals of the main time scales, in the slave point they determine and register time interval receive the first received main signal. . time scale leading point t Јn Node time scale of the leading point relative to the reference time signal change of driven item t op1 in the lead in the master and slave points, the second additional signals of the main time scales with delay are transmitted by radio channels. T t and tgn are correspondingly equal to the signals of the reference scales of the driving and slave points, the transmitted second additional signals of the main time scales are received. , a point, determine the time interval of the advancing of the received Q of the first signal of the main time scale of the slave point relative to the signal of the time base leader of the SFP), in the master and slave points transmitting over the radio channels to the slave point, determine the time interval determining the time position of the received second additional signal of the main time scale of the leading point from the second signals of the main time scales with delays equal to t (jn and t, respectively) and slave points, the second signals of the main time scales transmitted by -0 are received, the time interval determining the time position is determined and recorded at the slave point ue received second signapa main time master signal points relative to the measuring scale of the timeline slave item U, in the leading paragraph is determined and recorded time 55 but the signal of the measuring time scale of the slave point L, the time interval measuring the time position of the received second additional signal of the main time scale of the slave point relative to the signal of the measuring time scale of the master point D Ј is measured and recorded at the leading point There are second corrections, which determine the time position of the received second signal of the main time scale of the slave point relative to the signal of the time scale leading point D, characterized in that, in order to improve the accuracy of the comparison of time scales, the first amendments determine the first corrections to the time scales of the master and slave points according to the formulas A / 4 and D / 4, respectively, and carry out phase correction of the main, reference and from .time scales on the values the first corrections to the time scales, respectively, of the master and slave points, in the master and slave points, the first additional signals of the main time scales are transmitted by radio channels, the first additional signals of the main time scales are transmitted, the second point is used to determine and register the first additional signal the time scale of the leading point relative to the signal of the reference time scale of the slave point top, the leading point is determined and recorded the time interval ahead of th first auxiliary signal the main slave timescale point relative to the reference signal BUT time scale leading point t Јn in the master and slave points, they transmit via radio channels the second additional signals of the main time scales with shutters. respectively t t and tgn, relative to the signals of the time reference scales of the master and slave points, receive the transmitted second additional signals of the main time scales, but the signal of the measuring time scale of the slave point L, the time interval measuring the time position of the received second additional signal of the main time scale of the slave point relative to the signal of the measuring time scale of the master point D Ј is measured and recorded at the leading point are the second amendment13 ki respectively to the time scales of the master and slave items according to the formulas (D -Aj) / 2 and (Af-Lg) / 2 and carry out the correction of the main, reference and measuring time scales by shifting in advance towards the second corrections to the scales, respectively master and slave items. 2. A device for comparison of scales time, containing in series between the master and the slave points a series-connected clock and a clock-to-radio signal converter, sequentially connected transducer radissig-timescales and the first and second outputs The clock signals and the clock signal selector, connected in series, the time signal generation unit and the time interval determiner, are characterized in that, in order to improve the accuracy of the comparison of time scales, the serially connected start pulse selector, control signal generator and the divider are entered. The outputs of which are connected to the corresponding signal inputs of the clock correction value, connected in series to the signal conditioner The sign of the amendment and the additional option of the second outputs of the block forming time limiter, the outputs of which are connected to the information inputs of the dividing unit, while the first and second outputs of the clock are connected respectively to the first and second inputs of the trigger pulse selector, the first, second and third outputs of which are connected respectively to the output of the time scaler control signals and the first control input of the signal converter of the clock to the radio signal, the second control input of which is connected to the output of the interval determinant time, the first and second outputs of the selector of the received clock signals are connected respectively to the second input of the time interval determiner and the first input of the signal conditioner Correction sign, the second input and the second output of which are connected respectively to the second output of the time signal generation unit and the combined second the inputs of the additional determinant of intervals and the driver of the control signals, the third and fourth inputs of which are connected respectively to the third 407914 Signal correction signal and the second clock output, and the second, third, and fourth outputs of the control signal generator are connected to the first and second correction sign inputs and the clock enable input, respectively, and the clock contains a series-connected reference frequency generator, time correction meter, and frequency divider , with the inputs of the signal values of the correction, the first and second inputs of the sign of the amendment, allowing the input of the offset ten 0 five the frequency dividers are respectively the inputs of the correction values, the first and second inputs of the correction mark, the enabling input and the first and second clock outputs, and the time scale signal generation unit contains the time reference signal generator and the measurement time scale generator connected in series, and the input and the output of the driver of the signals of the reference time scale and the output of the generator of signals of the measuring time scale are respectively the input, first and five timescale signals. 3. The device according to claim 2, characterized in that the driver of the control signals comprises a series-connected RS flip-flop, a first AND element and a counting trigger, as well as a delay unit and a second And element, the first input and output of which are connected respectively to direct output-1 to RS-flip-flop and S-input of the counting flip-flop, moreover, S-input of RS-flip-flop, combined input of delay unit and the second input of the first element AND, the second input of the second element AND, the combined R inputs of the RS flip-flop and the countable-1 th trigger, the direct output of the first RS flip-flop, the direct and inverse outputs of the counting flip-flop and the output of the delay block are respectively, from the first to the fourth inputs of the first to the fourth outputs of the driver control signals. 4. The device according to claim 2., characterized in that the trigger pulse selector comprises a series-connected KS trigger, AND element, frequency divider and OR element, the first and second inputs of which are connected respectively to R- and S-inputs of the RS-flip-flop, the second input of the AND element, the S-input of the RS-flip-flop, the output and the first input of the OR-element and the inverse output of the RS-flip-flop are the first and second inputs, respectively, and the first - fourth outputs of the trigger pulse selector. 5. The device according to claim 2, distinguishes Dees by the fact that the signal conditioner The correction sign contains the first AND element and the first delay unit, the first OR element, the second AND element, the second OR element, the second delay unit, 18 nineteen 20 21 fi & w RS trigger, level converter and adder, the second input of which is connected to the first inputs of the first AND and OR elements, the output of the latter is connected to the S input of the RS trigger, the output of the first delay unit is connected to the second input of the second OR element, and the combined second the inputs of the first OR and AND elements, the first input and output of the first OR element, the outputs of the second IL element and the adder are the first and second inputs and the first, second and third outputs of the signal conditioner Correction Signal, respectively. 1 l1 jF l "7 T i 23 F s 2b J 25 Fig.b FIG. five