SU410329A1 - - Google Patents

Description

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The invention relates to the field of radio measurements.

A device for unambiguously measuring the phase difference of radio pulses is known, comprising a series-connected controlled phase shifter, a phase detector and an indicator, as well as a phase shifter control circuit. However, it does not allow to unambiguously determine the phase difference of continuous microwave signals and does not allow to automate the measurement process.

The purpose of the invention is to eliminate the ambiguity of determining the phase difference of continuous signals and automate the measurement process.

This is achieved in that the device is provided with a control key between the output of the phase detector and the indicator.

This made it possible to obtain a pa output of the controlled key pulses, the polarity and shape of which are uniquely associated with the quadrant in which the measured angle lies.

FIG. 1 and 2 show a functional diagram of the device and timing diagrams.

The device consists of a balanced phase detector 1, a controlled phase shifter 2, a delay line 3, a controlled key 4, a pulse generator 5 and an oscillographic indicator b. The test and reference signals are fed to phase detector 1, at the output of which the DC currents are subtracted. The pulse generator 5 and the delay line 3 create two series of pulses Ll and (7.2 (see Fig. 2), shifted relative to each other for some time.

The pulses from the output of the delay line are fed to a controlled phase shifter operating in the mode of increasing the relative phase difference, i.e. a pulsed phase modulation of one of the input microwave signals occurs. The constant voltage at the output of the phase detector is t / h, i.e. it turns out to be modulated by amplitude by square-wave pulses. The polarity and the sign of the increment of this voltage (during the action of the pulse arriving at the phase shifter) depends on the measured phase difference and

the quadrant in which the measured angle lies. Key scheme 4 is designed for pulse modulation of the output signal of the phase detector. In the initial position, the key is closed and opened by pulses from generator 5. This allows the constant voltage f / s to be converted into video pulses Ut, of a certain shape and polarity, with an amplitude proportional to the amplitude of the steady state at the output of the phase detector (in the absence of phase modulation).

The thus-obtained video & lgauses are fed to the oscillographic indicator 6. The polarity, the shape and the amplitude of these impulses carry information about the measured phase difference in the 2p interval. In this case, the shape and polarity of the video pulse give information about the quadrant in which the measured angle lies, and the amplitude is proportional to the phase angle within the quadrant. The determination of the angle within the quadrant is made in the usual way, but with the amplitude of the video pulse. This makes it possible to determine unambiguously the phase difference in the interval 2 directly across the indicator screen.

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A device for measuring the phase difference of continuous microwave signals, containing an adjustable phase shifter, a phase detector and an indicator, which is HI e c. so that, in order to eliminate the ambiguity in identifying the difference phases and automating the measurement process, it uses a controllable key between the phase detector and the indicator, and the controllable key input is connected via a delay line to the controllable input of the phase shifter and directly to the impulse generator.

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