RU8167U1 - QUANTUM STANDARD OF FREQUENCY AND TIME - Google Patents

Abstract

1. A quantum standard of frequency and time, containing a quantum frequency standard, the output of which is connected to the input of the device for generating temporary signals, characterized in that it additionally includes a frequency drift compensation device, the output of which is connected to the control input of the quantum frequency standard, and the first and second the inputs are connected respectively to the first and second outputs of the device for generating temporary signals. 2. The quantum standard according to claim 1, characterized in that the frequency drift compensation device comprises an encoding device, the first, second and third outputs of which are connected respectively to the first inputs of the RS flip-flop, the first reversible counter and the second reversible counter, the output of which is connected to the second input of the first a reverse counter, the first input of the valve and the second input of the RS-flip-flop, the output of which is connected to the first input of the third reverse counter, the second input of which is connected to the output of the valve and the third input of the first th down counter whose output is connected to a second input of the second down counter, the output of the third down counter, a third input of the second down counter and a second input gate are respectively output first and second inputs of the frequency drift compensation unit.

Description

The invention relates to the field of quantum radio engineering and can be used in quantum standards of frequency and time.

The known quantum standard of frequency and time 1 (see Fig. 1), containing the quantum standard of frequency 1, the output of which is connected to the input of the device for generating temporary signals (block for forming a timeline) 2. In this case, the reference frequency signal (MHz) is removed from the quantum standard frequency (Output I), and the reference time signal (a sequence of pulses with a repetition period of 1 s) - from the device for generating temporary signals (Output II).

This device is taken for the closest analogue.

The disadvantage of the closest analogue is the large error of the frequency and time scale due to the presence of a systematic linear frequency drift of the quantum frequency standard.

The invention is directed to solving the problem of reducing the error in frequency and time of quantum standards of frequency and time.

The essence of the invention lies in the fact that the quantum standard of frequency and time, containing the quantum frequency standard, the output of which is connected to the input of the device for generating temporary signals, additionally introduces a frequency drift compensation device, the output of which is connected to the control input of the quantum frequency standard, and the first and second the inputs are connected respectively to the first and second outputs of the device for generating temporary signals.

Figure 2 shows the structural diagram of the proposed quantum standard of frequency and time, where indicated:

1- quantum frequency standard,

2 - a device for generating temporary signals,

3- frequency drift compensation device,

4- frequency divider,

5- time counter

6 - encoding device

7- RS trigger

8 - the first reversible counter,

9 - second reversible counter,

10-valve

11- third reversible counter.

The quantum standard of frequency and time (see FIG. 2) contains the quantum standard of frequency 1, a device for generating temporary signals 2 and a device for compensating for the drift of frequency 3. The output of the quantum standard of frequency 1 is connected to the input of the device for generating temporary signals 2. The output of the device for compensating for the frequency drift 3 connected to the control input of the quantum frequency standard 1. The first and second inputs of the frequency drift compensation device 3 are connected respectively to the first and second outputs of the device for generating temporary signals 2. In this case, the reference frequency signal (MHz) is removed from the second output of the quantum frequency standard 1 (Output I of the quantum frequency standard and

time), and the reference time signal (a sequence of pulses with a repetition period of 1 s) is removed from the third output of the device for generating temporary signals 2 (Output II of the quantum standard of frequency and time).

The device for generating temporary signals 2 contains a series-connected frequency divider 4 and a time counter 5.

Frequency divider 4 is designed to divide the output frequency of the quantum standard frequency 1 (5 MHz) to 1 Hz. The intermediate output of the frequency divider 4 is the second output of the device for generating temporary signals 2.

Time counter 5 is designed to count pulses with a repetition rate of 1 Hz (repetition period of 1 s) and provides the determination and indication of the current time in hours (up to 24 hours), minutes and seconds. The output of the time counter 5, where there is a day change signal, is the first output of the device for generating temporary signals 2.

The frequency drift compensation device 3 comprises an encoder 6, the first, second, and third outputs of which are connected respectively to the first inputs of the RS flip-flop 7, the first reverse counter 8 and the second reverse counter 9. The encoder 6 is a mechanical code switch, with which the required code is dialed. The output of the second reverse counter 9 is connected to the second input of the first reverse counter 8, the first input of the valve 10 and the second input of the RS trigger 7. The output of the RS trigger 7 is connected to the first input of the third reverse counter 11, the second input of which is connected to the output of the valve 10 and the third the input of the first reverse counter 8, the output of which is connected to the second input of the second reverse counter 9. The output of the third reverse counter 11 is the output of the frequency drift compensation device 3. The third input of the second reverse counter 9 and Torah inlet valve 10 are respectively first and second inputs of the frequency drift compensation device 3.

The quantum standard of frequency and time works as follows.

1 The quantum frequency standard 1 generates a frequency-stable signal, but having a linear frequency drift. The frequency of this signal is divided up to 1 Hz (pulse repetition period 1 s) by the device for generating temporary signals 2, in which second pulse counts are also carried out. At the first output of the device for generating temporary signals 2, a signal for changing the day is periodically issued. At the second output of the device for generating temporary signals 2 pulses are pulled with a repetition rate of more than 1 Hz, for example, 1 MHz. These two signals are respectively supplied to the first and second inputs of the frequency drift compensation device 3, which once a day or once at a predetermined number of days (according to the code setting in encoder 6) generates a frequency correction signal, which is fed to the control input of the quantum frequency standard 1 and thus compensates for the drift of its frequency, and therefore, reduces the error in frequency and time of the quantum standard of frequency and time in general.

The correction amount, the correction sign, and the correction frequency are set in advance in the frequency drift compensation device 3, namely, in the encoding device 6.

In order to establish these values, first the frequency of the quantum standard of frequency and time for a long time (at least 1 month) is compared with the frequency standard, as a result of which the magnitude and sign of the frequency drift are determined. Subsequently, the frequency drift is checked by periodically checking the quantum standard of the frequency and time that it must pass.

The frequency drift compensation device 3 operates as follows. On the encoding device 6, a code is set for the magnitude, sign and frequency of correction (once a day or once at a given day). The second reversible counter 9 counts downward the number of pulses of the day shift coming from the time counter 5, set by the encoder 6, that is, the number of days through which the correction of the frequency of the quantum frequency and time standard should be carried out.

When the number “О” is reached, the second reversible counter 9 issues a command for frequency correction, which is sent to the RS flip-flop 7, starts the first reversible counter 8 and opens the valve 10. The sequence of correction pulses generated by the frequency divider 4 goes to the output of the valve 10 and the clock input of the first reversible counter 8, which also counts them down. When the first reversible counter 8 is zeroed, it generates a signal that brings the second reversible counter 9 and the entire compensation device 3 to its initial state, that is, the valve 10 closes, the first reversible counter 8 stops counting.

From the output of gate 10, a certain number of pulses will arrive at the counting input of the third reversible counter And, which will count them up or down depending on the signal about the correction sign received from the RS-trigger 7 (log.O or LOG.1). The signal from the output of the third reversible counter 11 will go to the control input of the quantum frequency standard, made in the form, for example, of a digital-to-analog converter, changing its frequency. Then the operation of the device is periodically repeated. Periodic correction of the frequency of the quantum standard of frequency and time means a change (compensation) of the drift of its frequency.

Thus, it is possible to reduce the magnitude of the frequency drift by 2-3 times or more and, therefore, reduce the error in frequency and time of the quantum standard of frequency and time by the same amount.

Literature. 1. Standards of frequency and discriminators, ed. pg. 275-283. time based on quantum generators and owls. Radio, M., 1978. Under. ed. B.P. Fateeva

Claims (2)

1. A quantum standard of frequency and time, containing a quantum frequency standard, the output of which is connected to the input of the device for generating temporary signals, characterized in that it additionally includes a frequency drift compensation device, the output of which is connected to the control input of the quantum frequency standard, and the first and second the inputs are connected respectively to the first and second outputs of the device for generating temporary signals. 2. The quantum standard according to claim 1, characterized in that the frequency drift compensation device comprises an encoding device, the first, second and third outputs of which are connected respectively to the first inputs of the RS flip-flop, the first reverse counter and the second reverse counter, the output of which is connected to the second the input of the first reversible counter, the first input of the gate and the second input of the RS-flip-flop, the output of which is connected to the first input of the third reverse counter, the second input of which is connected to the output of the valve and the third input a reverse counter, the output of which is connected to the second input of the second reverse counter, the output of the third reversing counter, the third input of the second reversing counter and the second valve input being the output, first and second inputs of the frequency drift compensation device.