SU371558A1 - DEVICE FOR MEASURING WAY TIME - Google Patents

Description

one

The invention relates to a device for linking precision time keepers to time signals transmitted by time service radios.

The known devices for anchoring the time keepers, consisting of a device for forming a movable strobe pulse corresponding to the leading edge of the pulse signal of the exact time, and devices for measuring the arrival time of the received signal of the exact time relative to the local time store, have a large error.

The proposed device for measuring the time of arrival of signals is provided with identical in composition and connected in series by n channels formed by series-connected rectangular pulse generators. The outputs of the generators are connected to one of the inputs of the coincidence circuit, its second inputs are connected to the output of the local time store, and the output of the coincidence circuit of the n-1st stage is connected to the input of the generator with an adjustable duration of the nth channel.

FIG. 1 shows a block diagram of the device; in fig. 2 - voltage plots, and - at the input of the generator (b) - at the output of this generator; b- at the output of the generator 2i; g - at the input of the circuit; g - pa of the output of this circuit;

e - at the output of the generator / 2; W - at the output of the generator C - at the input of the circuit 3-2 and - at the output of this circuit.

The device contains stand-by rectangular pulse generators with tuned duration adjustment, stand-by 2i-2l-rectangular pulse generators with a constant duration, i-5c coincident circuits.

In the device, a strobe pulse is formed from signals with frequencies F, f-10, / 10-, ..., / 10-, which are output from the local time storage. The device consists of L identical in composition and connected in series channels. Each channel includes a generator /, v rectangular pulses, working in standby mode with step „0.5

before

adjusting the duration of

f.lO

0 9.5

, generator 2p

/r.ioJ/-.10

coal impulses with constant duration1

by the nature of the zappy

F-IQ

the front of the output signal of the generator In, the scheme Zp coincidence, which receives pulses from the generator 2 "and the pulse signals of the time keeper with a frequency f-10. Each channel, according to the duration of the In generator pulses, allocates one of the ten pulses with a frequency of / 10,

one

. The one that falls into the interval

f-10

The pulse thus obtained from the 5 "coincidence circuit" is fed to the input of the next extraction channel to start the generator / 71 + 1. In this channel, as in the previous one, a pulse with a frequency that is an order of magnitude higher, etc., is singled out according to the same principle (Fig. 2). The signal at the output of the coincidence circuit is used as a gate pulse.

By varying the duration of the generator pulses, it is possible to change the position of the strobe pulse on the time scale of the local time keeper and achieve its alignment with the received pulse. First, a rough alignment is performed by switching the pulse duration of the generator / i, then more accurate using the generator / 2, and even more accurate using the generator / 3, etc.

Each successive generator improves the accuracy of reference by one order of magnitude, and the delays of all generators are added together. If there are N channels, the count can be

performed to the accuracy, if on f .lO

The initial frequency is F. After the strobe pulse is combined with the received pulse (the process and the quality of the combination is controlled by an oscilloscope), the position of the oscillator switches / 1, / 2, ..., IN is determined by decimal system This pulse is relative to the local time-storage scale, and the most significant digits are the readings of the / j switch.

This principle of operation of the device makes it possible to produce a strobe-pulse with a stability equal to the stability of the output signals of the time storage, i.e., the instability of the duration of the pulses of the generators / n and 2n is excluded.

The instability of the generator / “pulse duration should not exceed ± 5%,

otherwise it is possible to capture a pulse with the selected one. Generator / i can not recover, 05

update time if the duration is “0.95

The value of his pulse is set equal.

In this case, you can use two series-connected generators, giving a total of impulse with a duration of 0.95

In order to start up the generator i, pulses with a frequency (and then the strobe pulse is generated with a frequency -).

In addition, the output signals of the time saver with frequencies F, / 10, ..., not 0 should have time (or phase) shifts relative to each other.

Element ratings of In and 2p generators

may be the same except

parameters of the time of the specifying chains, which determine the duration of the output pulses.

Subject invention

A device for measuring the time of arrival of signals containing a local time keeper, rectangular pulse generators with stepwise adjustable duration, generators with a constant duration and a coincidence circuit, characterized in that, in order to reduce the measurement error, it is equipped with the same composition and connected in series channels formed in series

switched-on generators of rectangular pulses with adjustable and constant duration, the outputs of the generators are connected to one input of the coincidence circuit, its second inputs to the output of the local storage

time, and the output of the coincidence circuit of the n-1st cascade is connected to the input of the generator with an adjustable duration of the -th channel.

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