SU673972A1 - High-accuracy time radio signal selector - Google Patents

Description

-.- one

The invention relates to the field of instrumentation and can be used in systems of a single time and in autonomous hours, corrected by radio signals of an exact time. Notify. Selectors of radio signal of exact time, containing narrowband filter, detector, time selector and executive body of correction 1. The disadvantage of the known device is low noise immunity.

Also known are selectors of radio signals of exact time, which contain an ultrasonic bandpass filter, an amplitude detector, a coincidence circuit, a pulse counter, and a forcing correction signal 2. The drawbacks of the device are low reliability and noise immunity.

The circuit of the invention is an increase in the reliability and noise immunity of the correction.

This is achieved by the fact that in the proposed selector comprising a band-pass filter, an amplitude detector, a coincidence circuit, a pulse counter, a correction signal generator, a pause selector, an input

which is connected to the output of the amplitude detector, one of the outputs of the pause selector is connected to, the reset of the counter, and the other output to one of the inputs of the coincidence circuit, the second in k6To | oh is connected to the output of the amplitude deTector.

Using the pause selector to analyze pulse i

and the period of their following is due to the obvious ratio:

.-. ,:

 - lit pause;

T is the period of the following pulses “tj, is the duration of the pulses. As follows from the above ratio with; specifically, T and tj. the value of t will also be specific and constant. A final change in T and tj leads to a change in equality, which means to change. Sledova

It is worthwhile to analyze the duration of the pause for the case of the selection of the pulse duration and the period of its following. With this there is no need for a pulse selector and a pulse period selector. The block diagram of the proposed device is shown in FIG. one; time diagrams of the device operation - in FIG. 2. The block diagram of the proposed device contains a narrowband filter 1 connected to the input of the amplitude detector 2. The output of the amplitude detector 2 (point A) is connected to the input of the pause selector 3 and one of the inputs of the coincidence circuit 4, the other input of which is connected to one of the outputs of the selector 3 (point B). The cxeNtti coincidence output (point D) is connected to the input of pulse counter 5, the bus Reset of which is connected to the second output of selector 3 (point C and the output of counter 5 are connected to the correction signal formatter 6. The device operates on a continuous basis. The signals from the ridcWria receiver are input filter 1 tuned to the carrier frequency of the radio pulse / pulse mI1bt; e | {are amplified by the pulse 2 and input to the village of the pause 3 and one of the inputs of the coincidence 4. filled in pulses high frequency from either the internal generator (for example, the multivibrator) or the high frequency equipment that includes the high frequency equipment, which includes the exact time selector. The pause 3 selector is closed as follows. From the back of each one of the incoming signals the pulses reset the counter S to the zero state, after that it continues to fill up from the zero state to the pulses from the high frequency source. Y1) yaYyyyyy {: g "(eY% 1 in the pulse selector to a certain number determined by the length of the pause by the pulses of the time signals, the code combination analyzer generates a pulse at its output, the temporal position of the time signal and the beginning of the new period. The output of this analyzer of a combination of code for one of the outputs (point B) is set; ora pauses 3, midway with the input of the coincidence circuit.;. In addition, in the pause selector there is another analyzer k6m1 binadium, which corresponds The number of high-frequency pulses arriving at the pulse counter input over time, equal to the period of a trace of a pulse of exact time plus several periods of frequency. These several periods of frequency are necessary so that the output pulse C of the pause selector does not erase. the 67393972 time pulse meter informs about the number of pulses postinduced into it before the end of the falling edge of the subsequent exact time pulse, and since, as mentioned earlier, a new cycle of works begins counter selector, then, consequently, a reset pulse in this case will not be formed. The output of the second code combination analyzer is the second output of the pause selector (point C) and is connected to the Reset bus, the pulse time counter. Upon receipt (Fig. 2, a) of the output of the pause selector 3 (point A) of the first video pulse of exact time, a pulse is formed from its outputs (point B) at a distance equal to the duration of the pause of the yelding front line. This impulse: arrives at one of the circuit inputs; coincide, at the other input of which video signals of exact time arrive. If there is a second video: an exact time pulse in the owl circuit; a padé coincides with it (With the output pulse of the selector 3 (point B), as a result of which a pulse (point D) / which is recorded at the output of the coincidence circuit 4). 5. The pulse at the output C of the selector 3 is not generated, since the number of pulses necessary to form it did not arrive at the counter of the selector 3 before the arrival of the second fPonf of the second pulse. the process is happening t with the arrival of the 3rd, 4th / 5th and 6th video pulses. | After the arrival of the b-th pulse, the counting | CHIC of the exact time pulses is 5 VA and (the pulse starts the correction signal generator 6. After that, the selector pause 3 generates an impulse at its second output (point C), which reset the counter 6 to the zero position.Further, when there are no accurate time signals, the pause selector periodically generates pulses as output B, which does not go to counter 5 It means that there is no coincidence, and on the 8th of the year, according to which l is 5 13chetchika reset to zero. In the presence of random impulse signals, the following frequently encountered cases may occur (Fig.) .7:; 1. A double pulse signal has a following period equal to the Precise time signals, but the first | the pulse is shorter than the exact time pulse (Fig. 2.6). In this case, the match is formed by the selector 3 pulse with the ISTOptan pulse does not occur, so

hack the formation of a pulse at the output of the selector occurs before the second pulse arrives. At the same time, if the second pulse is relatively wide (longer than the pulse of the exact time), then after the pulse from the output B of the selector, a pulse is formed at the output C of the selector fed to the bus. Resetting the counter 5 If the second pulse is narrow, then the pulse at the output C will be formed after the arrival of the rear font of the second pulse,

2. The double pulse signal has a descending period equal to the period of the time signal, but the first pulse is wider than the time pulse (Fig. 2, c).

Depending on the width of the second pulse, the signal at the output B of the selector msbet coincide or not coBrtadat with the second pulse. In the first case, the record is written to the impulse counter of time S. However, with the impulse generated at the output C of the selector, counter 5 will be set to the B zero state. In the second case, the pulse will not go to the counter of the counter 5.

3. The double pulse signal has a Period duration, less than the duration of the period of the signals of the exact time (Fig. 2, d).

In this case, with a sufficient pulse width, a pulse can be formed to the counter input. However, due to the pulse at the output C of the selector 3, it will be erased. The same pulses the input pulses are narrow, the pulse does not arrive at the input of counter 5.

4. The double pulse signal has a period duration longer than the period duration of the signals of the exact time (Fig. 2, d).

Under these CONDITIONS, the pulses from the output B of the selector 3 and the output A of the detector do not coincide and.

therefore, there are no pulses on the input of counter 5.

5. A single pulse signal has a duration that exceeds the duration of the period of the signals of the exact time. Then, despite the fact that the selector 3 will generate pulses that arrive through the coincidence circuit, 4 to the input of counter 5, the latter each time will be erased by a reset pulse, Form 10 Ruyurms sa to output C of the selector 3. Thus, the accumulation of pulses in the counter 5 occurs Ke will be Kf, therefore, no formation of a correction impulse will occur. Similarly, it can be shown

5 that the correction signal will not be generated if there is an additional (within six seconds) three, four, and five random signals in the combinations considered by Bbmie.

0

Claims (2)

Invention Formula Precise time radio signal selector, narrowband band, 5 filter, amplitude detector, coincidence circuit, pulse counter, correction signal conditioner, 6tniij: a: vi n ii and teM, which, with Circuit 6 and 3, is equipped with a pause selector, which is connected to the interface amplitude detector, one of the pause selector outputs is connected to the bus reset counter / 5 a Another output is to one of the inputs cxsNuJ coincidence, the second input of which is connected to the output of the amplitude of the capacitor. Sources of information taken 0 into account in the examination of T. EfrömböK.KG Digital electronic clock with radio correction. Corpses LIchasproma. Issue, II, 1972, 2. USSR author's certificate №467318, cl. G 04 C 11/02, 1973.  . .g-i.J. .:.,    R Zizzff J