SU746321A1

SU746321A1 - Phase calibrator

Info

Publication number: SU746321A1
Application number: SU762330129A
Authority: SU
Inventors: Евгений Карлович Батуревич; Леонид Дмитриевич Огороднийчук
Priority date: 1976-03-04
Filing date: 1976-03-04
Publication date: 1980-07-07

Description

Изобретение относится к фазоизмерительной технике и может быть использовано при настройке фазочувствительной аппаратуры.The invention relates to a phase measuring technique and can be used to configure phase-sensitive equipment.

Известен калибратор фазового сдвига между двумя переменными напряжениями, содержащий синхронизирующий генератор, калиброванный фазовращатель, управляющий генератор, три канала деления частоты и два сместителя [1J .A known phase shift calibrator between two alternating voltages, comprising a synchronizing generator, a calibrated phase shifter, a control generator, three frequency division channels and two bias [1J.

Недостатком указанного калибратора является невозможность установления заданного сдвига фаз в широком диапазоне частот.The disadvantage of this calibrator is the inability to establish a given phase shift in a wide frequency range.

Известен и другой фазовый калибратор, содержащий управляемый фазорегулятор, преобразователь частоты, два смесителя, два фильтра, фазовый дискриминатор и управляемый двухфазный генератор [2] .Another phase calibrator is known, containing a controlled phase regulator, a frequency converter, two mixers, two filters, a phase discriminator and a controlled two-phase generator [2].

Последний из указанных калибраторов является более близким к описываемому изобретению.The last of these calibrators is closer to the described invention.

\ * 2\ * 2

Недостатком этого калибратора является зависимость модуля коэффициента передачи щирокодиапазонного калибратора от частоты и вносимого фазового сдвига, что не позволяет сохранить не5 изменным уровень сигнала в канале калибратора, содержащем фазорегулятор, преобразователь частоты, смеситель и фильтр и, следовательно, приводит к разным по величине дополнительным (паразитным) фазовым сдвигам в каналах формирования сигналов, поступающих на вход фазового дискриминатора, а это, в свою очередь, вызывает отклонение выходного фазового сдвига от задаваемого.The disadvantage of this calibrator is the dependence of the coefficient of transmission coefficient of the wide-range calibrator on the frequency and introduced phase shift, which does not allow to keep the signal level unchanged in the calibrator channel containing the phase regulator, frequency converter, mixer, and filter and, therefore, leads to additional (parasitic) ) phase shifts in the channels for generating signals arriving at the input of the phase discriminator, and this, in turn, causes a deviation of the output phase shift t asked.

^,5 Целью изобретения является повышение точности устанавливаемого фазового сдвига за счет уменьшения фазоамплитудной погрешности. ^{, 5} The aim of the invention is to increase the accuracy of the established phase shift by reducing the phase-amplitude error.

Указанная цель достигается тем, что между управляемым фазорегулятором и преобразователем частоты включен управляемый аттенюатор, а между выходами преобразователя частоты установлен ам плитупный дискриминатор, выход которого соединен с управляющим входом аттенюатора.This goal is achieved by the fact that a controlled attenuator is connected between the controlled phase regulator and the frequency converter, and an amplitude discriminator is installed between the outputs of the frequency converter, the output of which is connected to the control input of the attenuator.

На чертеже показана блок-схема фазового калибратора, выполненного согласно данному изобретению.The drawing shows a block diagram of a phase calibrator made according to this invention.

Фазовый калибратор содержит управляемый фазорегулятор 1, управляемый, аттенюатор 2, преобразователь 3 частоты, амплитудный дискриминатор 4, смесители 5 и 6, фильтры 7 и 8, фазовый ' дискриминатор 9 и двухфазный управляемый генератор 10, который может быть выполнен например, в виде дискретного формирователя заданного фазового сдвига, состоящего из пересчетных схем 11 и 12,генератора 13, формирователя 14 кода устанавливаемого сдвига фаз , регистра ' 15 памяти и блока 16 ключей.The phase calibrator contains a controlled phase regulator 1, controlled, attenuator 2, frequency converter 3, amplitude discriminator 4, mixers 5 and 6, filters 7 and 8, phase 'discriminator 9 and two-phase controlled generator 10, which can be implemented, for example, as a discrete shaper a predetermined phase shift, consisting of conversion circuits 11 and 12, a generator 13, a driver 14 of a code for a set phase shift, a memory register '15, and a block of keys 16.

Работа калибратора заключается в том, что задаваемый фазовый сдвиг автоматически переносится при помощи двухфазного генератора 10, смесителей 5 и 6, фазового дискриминатора 9 на входной сигнал, проходящий через фазорегулятор 1.The work of the calibrator is that the specified phase shift is automatically transferred using a two-phase generator 10, mixers 5 and 6, a phase discriminator 9 to the input signal passing through the phase regulator 1.

При помощи амплитудного дискриминатора 4 уровни выходных напряжений преобразователя 3 частоты сравниваются.Using the amplitude discriminator 4, the output voltage levels of the frequency converter 3 are compared.

Выходное напряжение амплитудного дискриминатора 4 управляет работой аттенюатора 2.The output voltage of the amplitude discriminator 4 controls the operation of the attenuator 2.

Равенство амплитуд выходных сигналов преобразователя частоты 3, достигнутое при помощи системы авторегули- ровки амплитуды, позволяет уменьшить погрешности установления заданного сдвига фазы.The equality of the amplitudes of the output signals of the frequency converter 3, achieved using the amplitude auto-adjustment system, makes it possible to reduce the errors of establishing a given phase shift.

Claims

The invention relates to a phase-measuring tepike and can be used when setting up phase-sensitive equipment. A phase shift calibrator between two variable voltages is known, which contains a calibrated phase shifter, a control oscillator, three frequency division channels, and two synchronizing oscillators. The disadvantage of this calibrator is the impossibility of establishing a predetermined phase shift in a wide frequency range. Another phase calibrator is also known, which contains a controlled phase regulator, a frequency converter, two mixers, two filters, a phase discriminator and a controlled two-phase oscillator 2. The latter calibrator is closer to the described invention. The disadvantage of this calibrator is the dependence of the transmission coefficient module of the wideband calibrator on the frequency and the applied phase shift, which does not allow the calibrator channel containing the phase regulator, frequency converter, mixer and filter to remain unchanged and, consequently, leads to different additional (parasitic) phase shifts in the channels of formation of signals arriving at Vio-. phase discriminator, and this, in turn, causes the deviation of the output phase shift from the specified. The aim of the invention is to improve the accuracy of the set phase shift by reducing the phase-amplitude error. This goal is achieved by controlling the attenuator between the controlled phase regulator and the frequency converter, and an amplitude discriminator is installed between the outputs of the frequency converter, the output of which is connected to the attenuator control input. The drawing shows a block diagram of a phase calibrator, performed according to the present invention. The phase calibrator contains a controlled phase regulator 1, a controlled one, an attenuator 2, a frequency converter of 3 frequencies, an amplitude discriminator 4, mixers 5 and 6, filters 7 and 8, a phase discriminator 9 and a two-phase controlled generator 10, which can be performed, for example, as a discrete driver of a given phase shift consisting of recalculated circuits 11 and 12, a generator 13, a driver 14 to a settable phase shift, a memory register 15 and a key block 16. The operation of the calibrator is that the settable phase shift is automatically transferred by means of a two-phase generator 10, mixers 5 and 6, and a phase discriminator 9 to the input signal passing through phase regulator 1. By means of an amplitude discriminator 4 levels of output voltages of converter 3 Frequencies are compared. The output voltage of the amplitude of the discriminator 4 controls the operation of the attenuator 2. The equality of the amplitudes of the output signals of the frequency converter 3, achieved with the help of the automatic gain control system s, 214 reduces the error of establishing a predetermined phase shift. The invention includes a phase calibrator containing a controlled phase-shifter connected between a signal source and one of the frequency converter inputs, the other input of which is connected to a signal source, two mixers, one of which inputs are connected to the frequency converter outputs, and the outputs are connected via filters the inputs of the phase diorator, whose output is connected to the control input of the phase regulator, and the controlled two-phase generator, which are respectively connected to the other inputs of the mixers, which is connected In order to improve the accuracy of the installed: induced phase shift by reducing the phase-amplitude error, a controlled attenuator is connected between the controlled phase-shifter and the frequency converter, and the amplitude discriminator between the outputs of the frequency converter is connected to the controlling one input attenuator. Sources of information taken into account in the examination 1. The author's certificate of the USSR M 189945, cl. Q 01 I 35/00, 1965,

2. USSR Author's Certificate No. 432421, Cl, Cr 01 P 25/04, 1972.