SU446846A1 - Phase meter - Google Patents

Description

The invention relates to the field of phase metering. Phase meters are known, which in each channel contain serially connected zero crossover formers and separate isolation circuits for unipolar pulses, with the outputs of the unipolar pulse discharging circuits connected to the inputs of the trigger device. A disadvantage of the known phase meters is the presence of an error due to a bias in estimating the phase difference due to noise. To reduce the bias of the estimated phase difference due to noise, the proposed phase meter is equipped with two additional positive and negative pulse separation circuits, two phase inverters and two IZH circuits, the output of each former is connected to the inputs of the corresponding pair of positive and negative pulse separation circuits, the outputs of the positive isolation circuits pulses are connected to the same inputs of the OR circuits directly, and the outputs of the negative pulse extraction circuits are connected through phase inverters to d ugimi inputs IL circuits whose outputs are connected to inputs of the trigger device. The drawing shows the scheme of the described phase meter containing the formers I and 1 zero crossing times, the corresponding derivative of the signal of the same sign, the 2 to 2 negative polarity selection scheme, the 3 and 3 positive polarity selection schemes, phase inverters 4 and the OR circuit 5 and 5, the trigger device 6. Suppose that the drivers of the moment of transition through zero separate pulses corresponding to the transition field of a pure signal through zero with a positive derivative.

and the noise in one of the channels of the phase meter oyutotovyuyuz ;. When turned on, the input of the imaging device I receives an mixture of signal and noise, and the input of the imaging device I, a pure signal, then we obtain the voltage, which is respectively supplied from the output of the imaging device I to the input of the allocation circuit 2 and to the input of the selection circuit 3,

The voltage from the output of the allocation circuit 3 is fed to one input of the OR 5 circuit. This voltage coincides in form with the voltage at the output of the OR circuit, since no other pulses are fed to the other input of the OR circuit 5 in the absence of negative pulses at the output of the imager I. The voltage from the output of the allocation circuit 2 is fed through the phase inverter 4 to the input of the circuit OR 5, to the other input of the circuit OR 5 pulses arrive from the output of the extraction circuit 3,

The voltage from the output of the IL 5 circuit goes to one input of the trigger device 6, to the other input of which voltage is fed from the output of the circuit OR 5. In this case, at the output of the trigger, phase pulses are formed in the absence of noise in both channels of the phase meter.

SUBJECT OF INVENTION

A phase meter containing drivers, two schemes for isolating positive and negative pulses, a trigger device, characterized in that, in order to reduce the bias in estimating the phase difference due to noise in a wide frequency range of input signals, it is equipped with two additional schemes for isolating positive and negative pulses, two phase inverters and two OR circuits, with the output of each driver connected to the inputs of the corresponding pair of positive and negative pulse extraction circuits, the outputs with it isolating positive pulses are connected to one inputs of circuits non-, mediocre and negative pulse extracting circuit outputs phase inverters are connected through other inputs of OR circuits, whose outputs are connected to inputs of the trigger device.