SU1019360A1 - Wide-band digital phase meter - Google Patents

Abstract

A BROADBAND DIGITAL PHASOMETER containing two shapers whose outputs are connected to a controlled trigger connected through two coincidence elements with a counter, a master oscillator that is connected to the second input of the first coincidence element through the serially connected phase shifter and the third driver , the first output time of the master divider is connected to the other input of the phase shifter via the phase shifter control unit and through serially connected the automatic unit and the trigger are connected to the second input of the second coincidence element, and a pulse-phase detector, characterized in that, in order to expand the frequency range, a switch, a harmonic driver and a switch control unit, whose outputs are connected to controllers, are additionally introduced into the black the switch inputs, the switching inputs of which are connected to the first, second, third and fourth outputs, are the time of the master divider, and the switch output is connected via a harmonic driver to one of the pulse inputs but a phase de- sector, the other input of which is connected to one of the inputs of the phase meter, and the output from the control input of the master oscillator, where the inputs of the control unit of the switch are connected respectively to the outputs of the second transmitter and time of the master divider.

Description

The invention relates to k radio measuring technique and can be used to improve the accuracy of measuring phase difference with digital phase meters in a wide frequency range.

Known digital phase meter with the transformation of the phase shift - the time interval - the code containing the forming device in each of the channels, the trigger, the coincidence circuit, a generator of quantizing pulses, time setting circuit and a pulse counter

The disadvantage of such phase meters is a significant increase in measurement error at low frequencies due to the non-multiplicity of the measurement time of the input signal period.

Also known is a digital phase meter containing two drivers, the outputs of which are connected to a trigger, the output of which is connected to a counter through two elements, the second input of the first element matches through a driver, a phase shifter, a rotation speed controller, and a divider connected to the phase-locked loop. from the generator, phase detector, low-frequency filter and search circuit, the second input of the second element matches via a trigger, automatic block | and the divider is connected to the phase shifter and the generator, the second input of the phase detector through a filter, a bandpass amplifier and a harmonic generator connected to one of the inputs of the phase meter 2

The disadvantage of this phase meter is the limitation of the measurement range caused by the complexity of tuning the master oscillator in a wide frequency range.

The aim of the invention is to expand the frequency range.

The goal is achieved in that a device containing two drivers, the outputs of which are connected to a controlled trigger, connected via two coincidence elements to a counter, specifies a generator, which is connected through a series-connected phase shifter and the third driver to the second input of the first coincidence element and directly the time of the master divider to the input, the first output of the time of the master divider is connected through the control unit of the phase shifter

A switch, a harmonic driver and a switch control unit, the outputs of which are connected to the switch inputs of the switch, are entered to another input of the phase shifter and through the serially connected automation unit and trigger to the second input of the SECOND element of coincidence, and the pulse-phase detector (the switch inputs of which are connected to the first, second, third, and fourth outputs are the rams of the master divider, and the switch output is connected via a harmonic driver to one of the inputs of the pulse-phase detector, the other in the stroke of which is connected to one of the inputs of the phase meter, and the output to the control input of the master oscillator, the inputs of the control unit of the switch are connected respectively to the outputs of the second, the driver and the time of the master divider.

The drawing shows the block diagram of the phase meter.

The wideband digital phase meter consists of drivers 1 and 2, controlled trigger 3, elements 4 and 5 of coincidence, counter 6, pulse-phase detector 7 of harmonic generator 8, switch 9, switch control unit 10, time divider 11, divider 18 -21 frequencies, master oscillator 12, phase shifter

13, the third shaper 14, the phase shifter control unit 15, the automation unit 16 and the trigger 17.

The device works in the following manner.

The measured oscillations arrive at% turns of the 1st formers 2, at the output of which sharp-pointed pulses are formed, corresponding to zero crossings of the investigated voltages, along which trigger 3 forms rectangular pulses with a repetition frequency equal to the input signal frequency and duration equal to the measured phase difference. Rectangular pulses arrive at element C coincident-, to the second input of which quantizing pulses are received from the master oscillator 12 th. The phase shifter 13 and the former

14, Packs of quantizing pulses with the number of pulses in a pack proportional to the measured phase difference, are sent to the second element 5

310

matches, which opens for the measurement time, formed by the trigger 17 by the automation unit 1b and the time of the master divider 11, consisting of series-connected frequency dividers 18-21, the inputs of which receive the signal of the master oscillator 12. The measurement time is defined as

1- rrt- .P f

mame KB

where t., is the period of the impulses of the master

Ko

generator 12;

. n is the division factor of the frequency divider 18;

k is the division ratio of each of the dividers 19-21 frequency

A continuous and uniform rotation of the voltage phase of the master oscillator is provided by the phase shifter 13 and the phase rotator control unit 15, to the input of which the measurement time pulses are output from the time of the master divider 11,

To eliminate the error of non-variability of the measurement time, the period of the input signal and the operation in the optimal quantization mode, it is necessary to provide an integer relation between the period of the input signal, the period of the master oscillator and the measurement time. This is provided by a pulsed phase-locked loop system of a master oscillator 12, which consists of a pulse-phase detector 7, a harmonic driver 8, a switch 9 and a switch control unit 10. The input signal is fed to the input of the phase detector 7, the second input of which receives a signal in the form of pointed pulses from the output of the shaper of 8 harmonics. The input of the driver 8 harmonics receives a signal from the output of the switch 93604

ra e to the inputs of which signals come from the frequency divider 18,

4 M ..- J Co.

With divider 19 frequency fue / nk, with divider 20 frequencies, with divider 5 21 frequencies. One of these signals passes to the output of switch 9, depending on the control code issued by the switch control unit 10, the inputs of which receive signals of the input frequency from the output of the driver 2 and measurement time pulses from the output of the driver splitter 11. Depending on the ratio of the input frequency and chz

15 of the measurement time pulse at the output of the control unit 10 of the switch one or another control code m is set

m

20

p k3 t

ke

  - k at the output of the switch 9 there is a signal from the output of the frequency divider 21, when - at the output of the switch 9 there is a signal

from the output of the divider 20 frequency, with

 k. switch output

9 there is a signal from the output of frequency divider 19, with - k on

the output of the switch there is a signal from the output of the frequency divider 18.

Thus, an optimal operation of the pulse-phase auto-tuning system is ensured, at which the frequency tuning range of the master oscillator is reduced by pre-changing the frequency of the master oscillator fed to the input of the pulse-phase detector, the time by the master divider, and the division factor is determined by the ratio of time measurement and period of the input signal, which allows to expand the frequency range of the input signals of the phase meter.

Claims (1)

A WIDE DIGITAL PHASOMETER containing two shapers, the outputs of which are connected to a controllable trigger connected through two coincidence elements to a counter, a master oscillator, which is connected through a series-connected phase shifter and a third shaper to the second input of the first coincidence element and directly to the input of the timing divider, the first output of the timing divider through the phase shifter control unit is connected to another input of the phase shifter and through the series-connected block av the tomatoes and the trigger are connected to the second input of the second coincidence element, and a pulse-phase detector, characterized in that, in order to expand the frequency range, a switch, a harmonic driver and a switch control unit are added to it, the outputs of which are connected to the control inputs of the switch, switched the inputs of which are connected to the first, second, third, and fourth outputs of the time-divider, and the output of the commutator is connected via a harmonic generator to one of the pulse-phase inputs dech'ektora, the other input of which is connected to one input of the phase meter, and an output to a control input of the master oscillator, wherein the switch control unit inputs connected respectively to the second outputs of the timing generator and divider. SU .1019360%