SU579683A1 - Phase discriminator - Google Patents

Description

one

The invention relates to radio engineering, can be used in electronic transceiver and measurement equipment.

A phase discriminator containing a zero beat discriminator is known, the inputs of which are respectively connected to the input and reference signal sources, a home modulator to the inputs of which are respectively connected an input source and through a converter, voltage - frequency - output of the zero beat discriminator, output phase detector, the inputs of which are connected respectively to the output of the phase modulator and the source of the reference signal l.

However, when the destabilizing factors are affected by this discriminator, a detection error occurs. In addition, the device can not be used in automatic mode.

The purpose of the invention is to increase the accuracy of discrimination.

For this, the phase discriminator containing the discriminator zero beat, the KL input of which is respectively connected

sources of input and reference signals, a phase modulator, to the inputs of which the input signal source and, via a voltage converter - frequency - output of the discriminator zero-beat, respectively, are connected, the output phase detector, to the input of which the phase modulator output and the source of the reference signal are connected, entered synchronous detector. The inputs of which are respectively connected to the output of the phase detector and the output of the converter. The voltage is a frequency, and the output is connected to the control input of the phase modulator.

The drawing shows a structural electrical circuit of the discriminator.

The inputs of the input and reference sources are connected to the inputs of the discriminator of zero beats 1; signals to the inputs of the phase modulator 2, respectively, the input source and through the voltage converter, frequency 3, the output of the zero beat discriminator 1. The inputs of the output phase detector 4 are connected respectively to the output of the phase modulator 2 and.

reference signal source. The switch of the digital detector 5 is respectively connected to the output of the output phase detector 4n on the output of the voltage converter 3, and the output is connected to the control input of the phase modulator 2,

The device works as follows

The input signals U and U are sent to the discriminator of zero beats 1. At the output of the discriminator a constant voltage of the corresponding sign is formed, the proportional difference between the frequencies of the signals U and Ug, the voltage converter 3 frequency produces a signal whose frequency is equal to the difference frequency of the signals U and Uj . This signal controls the phase modulator 2, compensating for the L / gbix ripple at the output of the phase detector 4, which occurs with the difference frequency of the compared signals.

This compensation occurs only when the ripple frequency is properly phased with the output frequency of the voltage converter - frequency 3. Phase synchronization is performed by comparing U n, 1X the output voltage of the converter / voltage - frequency 3 in the synchronous detector 5, the resulting signal error controls the phase modifier. 1, providing an effective compensation mode for the output voltage ripple.

Thus, the proposed phase discriminator makes it possible to increase the accuracy of measurement of the instantaneous difference φ-ю of two synchronous signals by affecting the measurement result of the difference frequency.

Claims (1)

1. USSR author's certificate No. 441641, N OZV 3/04, 1973. tix