SU1265643A1 - Method for measuring time intervals between rectangular pulse trains - Google Patents

Abstract

This invention relates to a radio measuring technique. It can be used to create meters of small time intervals between pulsed signals. The purpose of the invention is to expand the dynamic range of the measurement in the direction of small time intervals, which is achieved by converting two source signals into a single pulse signal with a periodic time modulation and measuring the amplitude of the spectral component due to the time interval between the input signals. The device realizing the method contains trigger 1, switch 2, elements 3 and 4, a constant delay line 5, a variable delay line 6, an element OR 7 a driver of 8 standard pulses, a selective microvoltmeter g. 2 Il. , T1DGTP

Description

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The invention relates to a radio measuring technique. And can be used to create meters of small time intervals between pulsed signals.

The purpose of the invention is to expand the dynamic range of the measurement in the direction of time intervals.

This goal is achieved by the fact that, according to the method of measurement, two initial signals are converted into one pulse signal with a period-time-time modulation followed by measuring amgde, D is the amplitude of the pulses; (.J. Is the pulse duration; T is the period of the pulse signal E is the time shift between the original pulse signals 1. The spectrum S contains components A | with frequencies jt, where. П; 1,3,5, .., amplitudes which line depends on the value of the time interval S between the original signals: a 1 tl ". g I - For indices n close to the value Q, where Q is the duty cycle of the pulse signal, the expression (3) is simplified 7LS A (Q). (3) Thus, by measuring the amplitude of the component of the spectrum of the converted signal А Т / at known values of the amplitude of the pulse A and the impulse period of the T signal, it is possible to determine the value of the time interval f according to the formula "AQT / r. The device implementing this method of measurement contains trigger 1 with a counting input, switch 2, two elements 3 and 4, a constant delay line 5, a variable line 6 delay circuit OR 7, form 656432

plots of the spectral component due to the time interval between the original signals.

FIG. 1 shows a block diagram of a device implementing the method; in fig. 2 - time diagram.

The essence of the measurement method is closed. The result is that of two two-way signals, one signal is produced, a pulse signal with a period-period time modulation, the spectrum of which is S, with

 T is represented by the expression:

sinir - cos2irinFt +

Claims (2)

Cos 21 n- | t, hoist 8 standard pulses and a selective microvoltmeter 9. The input signals are fed to the input buses 10 and 11 connected to the input of the trigger and the first switch, respectively. One of the input signals is fed to the counting trigger 1, the switch 2 and the matching circuit 3. The outputs of the trigger 1 are connected to the inputs of the elements. AND 3 and 4, the outputs of which are connected respectively through a constant 5 and variable 6 delay lines to the inputs of the OR circuit 7, the output of which is connected to the input of the standardizer 8 of the pulse, the output of which is connected to the input of the selective voltmeter. The switch output is connected to the second input of the And 4 element. The second signal is fed to the second switch input 2. Before the measurements are started, the device is tuned (the device has a maximum sensitivity, for which switch 2 is placed in a position where the element 4 is passed to the element, the signal from the bus 10. Thus, the signal from the bus 10 goes to the counting trigger, ger 2 and elements 3 and 4. The variable delay line 6 achieves the minimum amplitude component of the signal spectrum at the output of the standard pulse generator, caused by the presence of different signal running times through the elements 3 and 4 and in the 5 and 6 delay lines The amplitude of this the component is controlled by a selective microvoltmeter 9. After that, the switch 2 is placed in a position where the signal from the input bus 11 passes to the element 4, the amplitude of the component is measured and the desired time interval is calculated by the formula (4) The invention of the method for measuring small time intervals between pulses of the latter in a rectangular shape is based on the fact that out of two initial sequences the pulse forms one sequence, then the spectral component depends on From the time shift between the initial pulse sequences, characterized in that, in order to expand the dynamic range of measurements towards the small time intervals, of the two initial pulse sequences, one pulse sequence is formed with a periodic modulation with periods of T and T, 3 T + T, T and T, - T is the time interval between the original pulse sequences: the period of the original pulse sequences, form a new sequence with a peri-constant constant and amplitude modulated with pulses while preserving the alternation of periods T, and T, j, measure the amplitude AY / (Tu of the spectrum of the new sequence at a frequency F - 1 where F p is the nearest odd number to the ratio where b and is the pulse duration a new sequence, and the desired time interval is determined from the ratio T.r - measurement of the amplitudes of the spectral spectrum; - amplitude of pulses of a new pulse sequence.