SU1201781A1 - Apparatus for measuring average phase shift of pulsed microwave signals - Google Patents

Abstract

A DEVICE FOR MEASURING THE MEDIUM SHIFT OF PHASES OF PULSE SURFACE SIGNALS, containing a phase detector, one of the inputs of which is an input for supplying one of the studied pulsed microwave signals, an adjustable phase shifter whose output is connected to another input of the phase detector, and the input is an input for supplying another of the pulsed microwave signal under study, and a null indicator, which is the same, so that, in order to increase the accuracy, between the output of the phase detector and the input of the null indicator a filter tuned to one lower harmonics of the test pulse repetition frequency microwave signals.

Description

This invention relates to a radio measuring technique.

The purpose of the invention is to increase accuracy.

The drawing shows the structural electrical circuit of the device for measuring the average phase shift of pulsed microwave signals

A device for measuring the average phase shift of pulsed microwave signals contains a phase detector 1, an adjustable phase shifter 2, a filter 3, and a null indicator 4.; The device works as follows.

Pulsed microwave signals that need to measure the average phase shift at the gate are fed to the inputs of phase detector 1: one directly and the other through an adjustable phase shifter 2. The signal from the output of phase detector 1 through the filter 3 tuned to one of the lowest harmonics pulsed microwave signals, is fed to the input of a null indicator 4, filled with, for example, an oscilloscope.

To determine the average phase shift between pulsed microwave signals when the phase shift between them changes during the duration

2017812

the pulse controlled by the phase shifter 2 compensates the phase shift between the signals until the signal at the output of the filter 3 reaches the zero level, which is fixed with the help of the null indicator 4. The readings on the slider of the adjustable phase shifter 2 correspond to the average phase shift between the pulsed microwave sig10

As is known from the theory of spectra of pulse signals, the amplitudes of the harmonics, whose frequency {satisfies condition i (where t is the pulse duration, are proportional to the area of the pulse.

Therefore, the condition of equality of the areas of the negative and positive parts of the alternating pulse

20 (which was fixed visually in the prototype))) corresponds to the equality of the amplitudes of the lower harmonics of the repetition frequency of the positive and negative pulses forming

25 alternating impulse. Since the repetition rates of the positive and negative pulses are the same, the total signal at the input of the zero-indicator 4 is zero,

30 when the readings on the scale of the adjustable phase shifter 2 correspond to the average phase shift between the pulsed microwave signals.

Claims (1)

DEVICE FOR MEASURING MIDDLE PHASE SHIFT OF PULSE MICROWAVES, containing a phase detector, one of the inputs of which is an input for supplying one of the studied pulsed microwave signals, an adjustable phase shifter, the output of which is connected to the other input of the phase detector, and the input is an input for supplying another of the pulse microwave signal under study, and a null indicator, excluding the fact that, in order to increase accuracy, a filter tuned to one of the lower ones is turned on between the phase detector output and the null indicator input harmonics of the repetition frequency of the investigated pulsed microwave signals. (8 SU - 1201781 120I781