SU367407A1 - - Google Patents

Description

DEVICE FOR DETERMINATION OF TIME SHIFT

one

The invention relates to electrical measuring devices, in particular, to devices for automatically detecting a time shift between second pulses of a quartz watch and accurate time signals.

A device is known for automatically determining the time shift between the second pulses of a quartz clock and the time signals of the auth. St. No. 284702, containing the receiver of signals of exact time; a moment value sensor of the steepness, the input of which is connected to the output of the receiver, and the output to one of the inputs of one of the time interval meters; a voltage meter, one input of which is connected to the output of the receiver, and the other to the output of the sensor of the moment of the constancy of the steepness; a slope meter, one input of which is connected to the output of the receiver, and the other to the output of the sensor of the moment of the constancy of the slope; quartz watch; a time interval meter, one input of which is connected with the output of the master quartz watch, and the other with the output of a steepness moment constant moment sensor; the computing device, the first INPUT of which is connected to the output of the voltage meter, the second to the output of the slope meter, and the third to the output of the time interval meter.

The principle of operation of the known device consists in fixing the moment of the steepness value around the 1 time signal, measuring the incidence ji of the steepness of the bend at a specified time, measuring the time shift between the second pulses of the master quartz watch and mentioned. coping and, finally, finding a known formula using a computing device by measuring the voltage, slope and time interval of the magnitude of the time shift between the second pulse of the master quartz watch and the signal scarlet exact time.

However, in such an arrangement, the total signal delay in the transmission path entered into the computing device is measured at the time of equipment calibration, and in the interstices between these moments it can for some reason or other change, which is why the error occurs. these changes, leading to a decrease in the accuracy of the determination of the time shift.

The proposed device provides an increase in the accuracy of the automatic determination of the time shift between the second quartz clock pulses and the exact time signals. It has a total delay in

The transmission path is measured in the process of a time-sensitive signal reception session and the results of this measurement are entered into a computing device.

For this, the device is equipped with a receiver bandwidth switching circuit, the input of which is connected to the output of the computing device, and the output is connected to the second input of the receiver.

The drawing shows a block diagram of the device.

The output of the receiver / is connected simultaneously to the INPUT of the sensor 2 of the moment of the constant slope, to one input of the meter 5 voltage and to one input of the meter 4 of the slope, and the output of the sensor 2 to the second inputs of the meter 3 and 4 and to one input of the meter 5 of the time interval, the second input of which is connected to the output of the quartz master clock 6. The outputs of the meters 3, 4 and 5 are connected to the corresponding inputs of the computing device 7. The input of the band-pass circuit 8 is connected to one of the outputs of the computing device, and second circuit coupled to a second input of the receiver 1.

The receiver band switching circuit is designed as a trigger circuit. As its load, an electromagnetic relay is used, the contacts of which make the necessary switchings in the receiver circuit.

The device works as follows.

The radio signal of exact time is fed to the input of the receiver 7 and from the output of the intermediate frequency amplifier amplifier of the receiver, is fed to the input of the sensor 2 of the moment of the constancy of the slope, to one of the inputs of the meter 3 voltage and to one of the inputs of the meter 4 of the slope.

The front of the attenuating signal at the receiver output has a linear section, therefore at the moment when the voltage at the output of the receiver reaches this section, the sensor 2 of the moment of the constancy of the steepness generates a pulse signal at the output. The pulse signal from the output of this sensor sends a 3 meter voltage to the second input, 4 slopes to the second input, and a 5 time interval to the meter input.

Meters 3 v. 4 outputs, at the outputs in the form of a potential code, the values of the voltage and the slope of the signal at its first inputs at the moment when the pulse arrives at the second inputs. The measured values of the voltage and the slope of the signal are fed from the outputs of these meters to the first two inputs of the computing device 7.

The time interval meter 5 gives the output of the potential code as the value of the time shift between the pulse signal from sensor 2 of the steepness moment constant passing one of its strokes and the second pulse from the master quartz clock 6 arriving at the second input. The measured value of the time interval is supplied from the output of the meter 5 time

interval to the third input of the computing device 7.

The device 7, using the data received at its inputs, calculates the magnitude of the shift of the beginning of the signal of the exact time Dt relative to the second impulse of the local clock in accordance with the formula

 t, -, (1)

SL /

where ti is the moment of the beginning of the asymptotic-linear segment of the envelope of the time signal of the time counted in the quartz watch system; t / i is the value of the envelope voltage

time signal at time 5i - the value of the steepness of the envelope of the time signal at time A / is the band of transmission and reception of radio signals;

6-total measurement capacity

AT values over the envelope. In total, about 300 second pulses are transmitted during the time signal transmission session. The first half of these pulses are received and averaged over time at the Afnpi receiver band, with the result that

and, (A / i)

(2)

L1 f, (AfO5i (LL)

TED / 1

where M (x) is the estimate of the mathematical expectation of X.

After the passage of the first half of the exact time signals, the computing device issues a control signal to the circuit 8, which switches the receiver band / (the new band value - AFnp). As a result

processing the second half of the time signal is the expression

M (. (3)

V-SiCA / a) J D / a

Substituted expressions (2) and (3) into equation (1) and taking into account that

A /, (AR, AFnpJ, 1

(four)

50 A /, cp {AF,.

where af

-equivalent transmission path to the receiver;

AFnp,, AFnp2 receiver bandwidths before and after switching bandwidth; F {} is a rational function, the form of which is determined by the shape of the frequency characteristics.

transmission and reception paths, we obtain the bandwidth value Af of the radio transmission path to the receiver, which previously could not be measured and caused the errors in determining the time shift between the second signals of the local clock and the exact time signals. Substituting this value into the expression (1), we determine the exact value of the shift Dt taking into account the measured bandwidth in the transmission path of the signals of the exact time.

The proposed device makes it possible to increase by almost an order the accuracy of the automatic determination of the time shift between the second pulses of a quartz clock and the accurate time signals.

6 Subject of the invention

Device for determining the time shift by aut. St. No. 284702, characterized in that, in order to increase the accuracy of automatically detecting the time shift between the second quartz clock signals and the accurate time signals, the device is equipped with a switching band of the receiver bandwidth, the input of which is connected to the output of the computing device, and the output connected to the second input receiver.