SU1075185A1 - Radio pulse signal phase meter - Google Patents

Abstract

RADIO IMPULSE PHASOMETER, containing connected to the synchronization input serially connected selection pulse generator, selector, shock excitation circuit, phase detector, the second input of which through the phase shifter is connected to the reference signal input, differing in that, in order to improve the measurement accuracy) it is entered connected between the synchronization input and the signal input of the selector, a series-connected auxiliary voltage driver, multiplier, subtractor, second second input of which is connected to the output of the delay lines and the inputs of multiplier and delay lines are combined and connected to an input of the measured signal. (L

Description

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SP

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The invention relates to a phage measuring technique and can be used in radio engineering when measuring the phase difference of complex signals.

A phase indicator of radio pulse signals is known, containing a series-connected synchro-low-frequency generator and a phase detector, the second input of which is connected to the reference signal source FL.

However, the known phase meter is characterized by an increase in the potential for measuring the phase of radio pulse signals of complex shape.

The closest to the invention to the technical essence is a pulse phase meter containing series-connected selection pulse generator, a shock excitation circuit, a phase detector, the second input of which is connected to the source of the reference signal through the phase shifter, and the signal input of the selector is connected to the source of measured radio pulses 5J,

The introduction of the selector makes it possible to reduce the phase measurement error due to the formation of an integer number of periods of high-frequency filling of radio pulses with the least varying amplitude at a signal-to-noise ratio providing the required measurement accuracy. However, the accuracy of measuring the phase of the carrier wave of complex radio signals with such a device is insufficient,

The purpose of the invention is to improve the accuracy of measuring the phase of complex radio pulse signals.

The goal is achieved by /) the fact that series-connected selection pulses connected to the synchronization input, a selector, a shock excitation circuit, a phase detector, the second input of which is connected to the reference signal through the phase shifter, are inserted between the synchronization input and the signal input a selector connected in series an auxiliary voltage driver, a multiplier, the subtractor whose second input is connected to the output of the auxiliary line, and the input The delay lines are multiplied together and connected to the input of the measured signal.

The drawing shows a functional diagram of the device.

The device contains connected in series to the input of the measured signal delay line 1, a subtractor 2, a selector 3, a shock excitation circuit 4, a phase detector 5; the second input of which is connected via the phase shifter b to the input of the reference signal, as well as a multiplier 7, a signal input connected to the input of delay line 1, and an output to a second input of extractor 2, the control input of the multiplier 7 is connected to the output of the ramp 8 of the auxiliary voltage input connected to the synchronization input and the input of the generator selective pulses:; s, the output of which

connected to the control input of the selector 3,

Phase meter works as follows.

The signal inputs of the multiplier 7 line 1 delay signal is received

(one)

lllthU, .co. (. b.il,

the phase of which we need to determine Cp, Line 1 delay delays the signal (1) for a time 1-, equal to o- 1 | and, therefore, the carrier oscillation of the radio pulse at its output has a phase,

opposite to the phase of the signal (1), and the video impulse can be represented as

. , bcosywU-ilwl

0 le11

where (d - the transfer rate of the delay line „

The video signal at the output of multiply 5 bodies 7 has the form

(3)

Ur.) Q (tbU, .4.,

0 GD® P the multiplication factor 7;

9 it) is the modulating signal arriving at the control input of the multiplier 7 from the output of the driver 8.

Ideal compensation for video impulses on the output of the subtractor. 2 can (be obtained if the signals coming to its inputs from the outputs of the delay line 6 and the multiplier 7 are identical.

The signals from the outputs of line 1 and multiplier 7 are fed to the inputs of subtractor 2, at the output of which a signal is generated

, t-ti, 1, l + cosyut (4 ullUlk, U ,, ()

 At the same time, oscillations of the carrier frequency of the signal (5) from the outputs of the delay line 1 and multiplier 7 are fed to the subtractor 2 in antiphase, so they will be summed at its output, which will further increase the ratio of the useful signal to interference.

From the output of the subtractor 2, the signal arrives at the selector 3, to the control input of which, from the generator output 9 of the selection pulses, gates arrive, gating the whole number of periods of the carrier signal (5) and the compartment of the mismatching video impulses 1 delay and multiply-Yu l 7. From the output of the selector 3, the generated radio pulse arrives at the input of the circuit 4 of the shock excitation, causing the oscillations of the latter to carry the phase Signal oscillations (5), from the output 15 of the shock excitation circuit 4, the signal arrives at the input of the phase detector 5, the second input of which receives the reference signal from the output of the phase shifter 6. As a result, the signal at the output 20 of the phase detector 5 characterizes the phase difference between the carrier oscillations of the measured and reference SIGNSHOV,

In practice, when setting up the compensation circuit of a phase meter, its input gives a signal that is identical to the video impulse of the input complex signal. The adjustment of the phase meter compensation circuits consists in the selection of coefficients and modulating signal from the output of the auxiliary voltage generator, which ensures the minimum amplitude of the response of circuit 4 to the effect of the input signal (video pulse).

This setting compensates for the response of circuit 4 to the effect of the video pulses of the input signal, which ultimately reduces the effect of the latter on the measurement result when complex radio pulses are applied to the phase meter input.

Thus, the introduction of a delay line into the known device, subtractor, multiplier, auxiliary signal generator allows to reduce the level of the video pulse in the complex radio pulse signal, as a result of which the accuracy of the measurement of the phase of the radio pulse signals of complex spectral composition is improved. The choice of parameters and the modulating signal of the auxiliary voltage driver makes it possible to completely eliminate the influence of the video pulse on the input signal on the response of the shock excitation circuit when a complex signal arrives at the phase meter input.

time shaft, | H | cv yJii ±

at

2 4

) f 0.1 - 0.2, the magnitude of the error in measuring the phase of complex radio signals with known devices can be achieved. The use of the proposed device under identical conditions (for the same signs) makes it possible to virtually eliminate this error.

Claims (1)

PHASOMETER OF RADIO PULSE SIGNALS, comprising serially connected a selection pulse generator connected to a synchronization input, a selector, a shock excitation circuit, a phase detector, the second input of which is connected to the reference signal input through a phase shifter, characterized in that, in order to increase the measurement accuracy; a series-connected auxiliary voltage shaper, a multiplier, a subtracter, the second input of which is connected to the output of the delay line, and the inputs of the delay line and multiplier are combined and connected to the input of the measured signal, are inserted between the synchronization input and the signal input of the selector. VTs-η. 1075