SU1167573A1 - Method and apparatus for matching time scales - Google Patents

Abstract

1. A method for comparing time scales, including the emission of time scale signals, their reception and re-emission by the location of the working and model clock systems being compared, as well as the reception of re-emitted signals and measuring the instants of occurrence of received signals, in order to reduce the mean square error of comparison time scales, form the reference time scale. -O and re-emission of signals is delayed relative to the reference time scale, with the delay being equal to twice the advance of the received signal relative to the same reference time scale. 2. A device for comparing time scales, containing working and exemplary watch systems, while the working hour system consists of a receiver connected in series, a signal splitter, a calculator, a recorder and a working clock, the outputs of which are connected to the transmitter and transmitter, and the sample clock system consists of receiver and model clocks, the output of which is connected to the transmitter, characterized in that the sample of the watch system is provided with a series (L connected with an advance meter and a doubling circuit delay and delayed pulse generator coupled to the second output of the clock model and the second input meter advance, the first input of which is connected to the receiver, doubling the output of the delay circuit is connected to a transmitter of:. eaten of:

Description

The invention relates to a technique for transmitting accurate time signals over radio channels and can be used to compare time scales using a two-way radio channel. There is a method of comparison of time scales by the method of two-way radio reception. In this case, at the location of the watch systems being compared, there are radio stations that can exchange signals that carry information about the time of the watch systems. A signal transmitted from one radio station is received by another radio station and re-emitted by it. The re-emitted signal is received by the first station, where the propagation time of the signals between the radio stations is determined. The correction for the signal propagation time determined in this way is transmitted to the tested clock, which is taken into account in the comparison operation of time scales 1. A disadvantage of the method under consideration is the need to transfer the correction value for the signal propagation time to the turnable clock on a separate communication channel. The closest to the proposed method is a method for comparing time scales, which includes measuring signals of time scales, receiving and re-emitting them at the locations of working and model clock systems, as well as receiving re-emitted signals and measuring the moments of occurrence of received signals 2. It is also known method, containing working and exemplary watch systems, while working hours of the system consists of connected in series receiver, signal splitter, calculator, register The ora and the working hours, the outputs of which are connected to the transmitter and transmitter, the exemplary clock system consists of the receiver and the reference clock 2. The disadvantage of this method is the large amount of measurement error of the magnitude of the time scale shift due to the finite signal-to-noise ratio at the input of the successor. br 1.22-6 is the rms error of measuring the temporal position of the signal at one point. The purpose of the invention is to reduce the rms value of the measurement error. This goal is achieved by the fact that, according to the method, including the emission of time-scale signals, their reception and re-emission by the location of the working and model clock systems being compared, as well as the reception of re-emitted signals and the measurement of the instants of the received signals, form the reference time scale, and the re-emission of signals t with a delay relative to the reference time scale, and the delay is equal to twice the value of the advance of the received signal relative to the same reference time scale. To achieve this goal in a device that implements a known method that contains working and exemplary watch systems, the working watch system consists of a receiver connected in series, a signal separator, a calculator, a recorder and operating hours, the outputs of which are connected to the calculator and transmitter the clock system consists of a receiver and a sample clock, the output of which is connected to the transmitter, the sample clock system is equipped with a series-connected forward gauge and a delay doubler circuit, as well as a delayed pulse generator connected to the second output of the reference clock and the second input of the Advanced meter, the first input of which is connected to the receiver, while the output of the double doubling circuit is connected to the transmitter. FIG. 1 shows a diagram of an apparatus for implementing the proposed method; in fig. 2 - diagrams illustrating the operation of the device. The device contains serially connected at the location point of an exemplary clock system: receiver 1, forward gauge 2, delay doubled circuit 3 and transmitter 4, output of exemplary clock 5 connected to transmitter input 4, and through generator 6 delayed pulses 6 to second gauge input 2 ; At the location of the working time system are connected in series: the receiver 7, the splitter 8 signals, the calculator 9 and the recorder 10, as well as the working hours 11 connected to the calculator 9 and to the inputs of the transmitter 12. The device for implementing the method of comparison of time scales works as follows. The transmitted signal of the time scale of the working hours 11, radiated by the transmitter 12, is received at the point of location of the reference hours by the receiver 1. The signal from the output of the receiver 1 triggers the advance meter 2. At the time of the appearance of the impulse of an additional time scale from the output of the generator b of the delayed pulses, the reverse gauge 2 is reversed and the indication of the gauge of the advancing begins with a decrease in the clock frequency by two times. At the time of the end of the reading

An impulse is formed at the input of the delay doubling circuit 3, which is fed to the input of the transmitter 4 and is radiated. Since the reading time of meter 2 is twice as long as the recording time, this provides a delay in reradiation of a relatively specially formed additional time scale, and the delay is equal to twice the advance of the received signal relative to the same additional time scale.

The pulses of the exemplary clock 5 arrive at the input of the transmitter 4 and are emitted.

At the location of the working hours, the pulses of the time scale of the working hours 11 start the meter 9, enter the input of the transmitter 12 and are emitted.

The receiver 7 receives the emitted signals of the time scale of the reference hours and the re-emitted delayed signals of the time scale of the working hours. From the output of the receiver, these signals with the help of the separator 8 signals are fed to the corresponding, and the inputs of the calculator 9, which calculates the magnitude of the shift of the time scales.

Regarding the impulse of the time scale of model hours (diagram 13), the impulse of the time scale of working hours (diagram 14) is shifted by the value V. The impulse of an additional time scale of model hours (diagram 15) is delayed by the value T.

The emitted signal of the time scale of the exemplary hours through time 0, equal to the time of radio waves propagation in the radio channel, arrives at the point of working hours. This signal is delayed relative to the time scale of working hours by the value of m.

The emitted signal of the time scale of the working hours 14 enters the location of the model hours at a time equal to 9 after the emission. At the model clock point, the advance of the received signal relative to the additional time scale ti is measured, after which a delay of t 2ti is produced and the received signal is reradiated (Figure 16). The re-radiated signal arrives at the point of the working hours (Diagram 17), where its delay is measured relative to the local time scale. From the measured values, the type of determine the magnitude of the shift of the time scales. From the diagrams below it follows that

m 0 - V - Atie,

where Atia is the error of fixing the time / pulse position 18, due to the finite signal-to-noise ratio. From chart 16 you can determine

 -e-v-atie,

where At 16 is the pulse fixation error 16.

The delay of the re-emitted signal relative to the time scale of working hours

n 2 v-3ti-i-t, y ЗТ-0-3V -

-24t, 6 + Ati7,

where At IT is the pulse fixation error 17.

The magnitude of the shift of the time scales V can be determined from the expressions for the type

t + p ST-4Y-2Ati6 + Atir -} - Atia

as

V- 3t 1 2Ati6 AtiT A J8

  A 44

The measurement error of the magnitude of the shift of the time scale of the clock at equal values of the mean square error of fixing the time position of the pulses b at each point:

b, 0.61

Thus, the proposed method for comparing time scales and a device for its implementation provide a reduction in the mean-square error.

0

Claims (2)

1. A method of comparing time scales, including emitting signals of time scales, receiving and re-emitting them with points of location of compared working and exemplary clock systems, as well as receiving re-emitted signals and measuring the times of occurrence of received signals, characterized in that, in order to reduce the standard error of comparison of the scales time, form the reference time scale, and the re-emission of the signals is delayed relative to the reference time scale, and the delay is equal to twice the amount of lead when yatogo signal relative to the same reference time scale. 2. A device for comparing time scales containing a working and an exemplary clock system, while the working clock system consists of a receiver, signal separator, calculator, recorder and working hours connected in series, the outputs of which are connected to the calculator and transmitter, and the model clock system consists of the receiver and the reference clock, the output of which is connected to the transmitter, characterized in that the reference clock system is equipped with a series-connected advance meter and a delay doubling circuit As well as delayed pulse generator coupled to the second output of the clock model and the second input meter timing, the first input of which is connected to the receiver, doubling the output of the delay circuit coupled to the transmitter.