SU968768A1

SU968768A1 - Method of protecting photometers and frequency meters from broad-band noise

Info

Publication number: SU968768A1
Application number: SU813277264A
Authority: SU
Inventors: Алексей Порфирьевич Похилюк; Валерий Петрович Пилипчак
Original assignee: Винницкий политехнический институт
Priority date: 1981-04-15
Filing date: 1981-04-15
Publication date: 1982-10-23

Description

Изобретение относится к радиоизмерительной технике и может быть использовано при разработке фазомет-. ров и частотомеров.The invention relates to a radio metering technique and can be used in the development of a phase meter. ditch and frequency meters.

Известно устройство защиты фазометров от широкополосных помех, которое представляет собой набор коммутируемых фильтров низкой частоты, включаемых между каскадами формирующих устройств, с полосой пропускания , исключающей формирование ложных нуль-переходов в заданном диапазоне частот [1].A device for protecting phase meters from broadband interference, which is a set of switched low-pass filters included between the stages of the forming devices, with a passband that eliminates the formation of false zero transitions in a given frequency range [1].

Однако введение коммутируемых фильтров усложняет схему фазометра и может привести к дополнительным погрешностям,зависящим от амплитуды и частоты сигнала.However, the introduction of switched filters complicates the phasemeter circuit and can lead to additional errors, depending on the amplitude and frequency of the signal.

Наиболее близким к предлагаемому является устройство, содержащее генератор, делитель частоты, элемент И и триггер. Исключение ложных иьйульсов основано на анализе длительности выбросов сформированного сигнала [2].Closest to the proposed device is a device containing a generator, a frequency divider, an And element, and a trigger. The exclusion of false signals is based on the analysis of the duration of emissions of the generated signal [2].

Недостаток этого устройства сложность.The disadvantage of this device is complexity.

Целью изобретения является снижение себестоимости и повышение надежности. .The aim of the invention is to reduce costs and increase reliability. .

Поставленная цель достигается тем, что в устройство защиты фазометров и частотомеров от широкополосных помех, содержащее пороговый формирующий элемент, вводится диод и конденсатор, а пороговый формирующий элемент выполняется как элемент ИЛИ,при этом первый вход элемента ИЛИ и его выход являются соответственно входом и выходом устройства, диод включен между первым и вторым входами элемента ИЛИ, причем анод подключен к первому входу, а конденсатор включен между вторым входом элемента и общей шиной устройства.This goal is achieved by the fact that a diode and a capacitor are introduced into the device for protecting phase meters and frequency meters from broadband interference containing a threshold forming element, and the threshold forming element is implemented as an OR element, while the first input of the OR element and its output are the input and output of the device, respectively , a diode is connected between the first and second inputs of the OR element, with the anode connected to the first input, and a capacitor connected between the second input of the element and the common bus of the device.

На фиг. 1 изображена структурная схема предлагаемого устройства; на фиг. 2 - эпюры, поясняющие его рабо20 ^ту In FIG. 1 shows a structural diagram of the proposed device; in FIG. 2 - diagrams explaining his rabo20 ^the

Устройство содержит элемент ИЛИ 1, между ’двумя входами которого включен диод 2, конденсатор 3, включенный между общим проводом и одним из входов элемента ИЛИ.The device contains an OR element 1, between ’two inputs of which a diode 2 is connected, a capacitor 3 connected between the common wire and one of the inputs of the OR element.

Устройство работает следующим образом.The device operates as follows.

Смесь широкополосного шума и сигнала (фиг. 2а) приводит к многократным пересечениям смесью нулевого уровня, т.е. к появлению ложных нулеA mixture of broadband noise and signal (Fig. 2a) leads to multiple intersections with a mixture of zero level, i.e. to the appearance of false zero

968768 4 вых переходов. На выходе широкополосного формирующего устройства фазометра появляются ложные импульсы (фиг.2S) которые нарушают нормальную работу фазометров и частотомеров.968768 4 exit transitions. At the output of the broadband forming device of the phase meter, false pulses appear (FIG. 2S) which interfere with the normal operation of the phase meters and frequency meters.

предлагаемом устройстве сигнал 5 с ниэкоомного выхода формирующего устройства поступает на элемент ИЛИ 1 на первый вход непосредственно,а на другой вход, к которому подключен конденсатор 3, через диод 2. В момент 10 появления переднего фронта первого положительного импульса происходит ^переключение элемента ИЛИ и быстрый 'заряд конденсатора 3 через низкое Выходное сопротивление источника . 15 сигнала и открытый диод 2. При поступлении на вход элемента ИЛИ 1 ложной впадины диод 2 отключает конденсатор 3 от первого входа элемента ИЛИ 1, и конденсатор 3 медленно, -л разряжается через большое входное сопротивление элемента ИЛИ 1. За время ложной впадины конденсатор 3 не успевает разрядиться до уровня переключения (фиг.- 2а)элемента _the proposed device, the signal 5 from the non-ohmic output of the forming device goes directly to the OR element 1 to the first input, and to the other input to which the capacitor 3 is connected, through the diode 2. At the moment 10 of the leading edge of the first positive pulse, the OR element is switched ^ and fast 'charge capacitor 3 through low output impedance source. 15 of the signal and open diode 2. When a false cavity arrives at the input of the OR element 1, diode 2 disconnects the capacitor 3 from the first input of the OR element 1, and the capacitor 3 slowly discharges through the high input resistance of the OR element 1. During the false depression, the capacitor 3 does not have time to discharge to the switching level (Fig. 2a) of the element _

ИЛИ 1. Следующий положительный . · · ’ импульс быстро подзарядит конденсатор 3. Таким образом, конденсатор 3 не позволяет переключаться элементу ИЛИ 1 по ложным впадинам между импульсами. Разряд конденсатора до 30 уровня переключения произойдет только после прихода последнего импульса.OR 1. The next positive. · · ’The pulse will quickly recharge the capacitor 3. Thus, the capacitor 3 does not allow the element OR 1 to switch along the false depressions between the pulses. The discharge of the capacitor to the 30th switching level will occur only after the arrival of the last pulse.

Предлагаемое устройство проще и дешевле известных,его применение позволит уменьшить производственные и эксплуатационные затраты.The proposed device is simpler and cheaper than known, its use will reduce production and operating costs.

Claims

The invention relates to a radio metering technique and can be used in the development of a phase meter. ditch and frequency meters. A device for protecting phase meters from broadband interference is known, which is a set of switched low-frequency filters that are switched between cascades of shaping devices with a passband that prevents the formation of false zero-transitions in a given frequency range. However, the introduction of switched filters complicates the phase meter circuit and can lead to additional errors depending on the amplitude and frequency of the signal. Closest to the present invention is a device comprising a generator, a frequency divider, an And element and a trigger. The exclusion of false impulses is based on the analysis of the duration of the emissions of the generated signal. 2 The disadvantage of this device is complexity. The aim of the invention is to reduce costs and increase reliability. . The goal is achieved by the fact that a diode and a capacitor are inserted into the protection device of phase meters and frequency meters against broadband interference, which contains a threshold forming element, and the threshold forming element is executed as an OR element, the first input of the OR element and its output are respectively an input and the output of the device, a diode is connected between the first and second inputs of the OR element, the anode is connected to the first input, and a capacitor is connected between the second input of the element and the common ishna device. FIG. 1 shows a block diagram of the proposed device; in fig. 2 - plots showing his work. The device contains an element OR 1, between the two inputs of which diode 2 is turned on, a capacitor 3 connected between the common wire and one of the inputs of the element OR. The device works in the following 1 way. A mixture of broadband noise and signal (Fig. 2a) results in multiple intersections with a zero level mixture, i.e. to the appearance of false zero transitions. False pulses appear at the output of the broadband forming device of the phase meter (Fig. 2, which disrupt the normal operation of the phase meters and frequency meters. 3 The proposed device receives a signal from the ohmic output of the forming device directly to the first input OR and to the other input to which capacitor 3 is connected, through diode 2. In the event of the appearance of the leading edge of the first positive impulse, the element OR is switched and the capacitor 3 is charged quickly through a low Output resistance source signal and open diode 2. When a false hollow arrives at the input of element OR 1, diode 2 disconnects capacitor 3 from the first input, element OR 1, and capacitor 3 slowly discharges through a large input resistance of the element OR 1. During a false hollow, the capacitor 3 It does not have time to discharge to the switching level (Fig. 2a) of the element OR 1. The next positive impulse quickly recharges the Capacitor 3. Thus / the capacitor 3 does not allow the element OR 1 to be switched along false pits between the pulses. The discharge of the capacitor to the switching level will occur only after the arrival of the last impulse. The proposed device is simpler and cheaper than the known ones, its application will allow reducing production and operating costs. Claims A device for protecting phase meters and frequency meters from wideband interference, which contains a threshold forming element, characterized in that, in order to reduce costs and increase reliability, a diode and a capacitor are introduced into it, and the threshold forming element is executed as an OR element, the first input The OR elements and its output are, respectively, the input and output of the device, the diode is turned on between the first and second inputs of the OR element, with an antenna connected to the first input and the capacitor connected between the second Odom OR gate bus and a shared device. Sources of information taken into account in the examination 1.Fishtein A.I. Phase-stable forming device. - Instruments and Experimental Technique, 1973, No. 3.

2.Glinchenko A, G. and others. Digital methods for measuring the phase shift. Novo, Siberia, Science, 1979, p. 218, fig. 6-18.

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