RU1780040C - Apparatus for measuring parameters of the envelope of radio pulses - Google Patents

Abstract

The invention relates to electrical engineering and 8 devices can be used to measure envelope parameters of radio pulses. The purpose of the invention is to improve the accuracy of measurements. The goal is achieved by introducing a switch into the device. The radio pulse envelope parameter meter comprises a generator 1. detector 2, an oscilloscope 3. 4 pulse generator, 5 signal adder, phase shifter 6. signal splitter 1 and signal ratio meter 8. 6 ill.

Description

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The invention relates to electrical engineering and can be used in devices of high accuracy for measuring envelope parameters of radio pulses.

The purpose of the invention is to improve measurement accuracy.

Fig. 1 shows a block diagram of a meter of temporal parameters of the envelope of radio pulses: Fig. 2 shows waveforms: Figs. 3-6 show images on an oscilloscope screen.

The device (Fig. 1) contains a generator 1. detector 2, a recording device (oscilloscope) 3, a pulse generator 4, an adder 5 signals, a phase shifter 6. a signal splitter 7, a signal ratio meter 8, a switch 9,

The measuring device or parameters of the incident radio pulses works as follows.

Mm pulses from the second output of the pulse generator 4 (Fig.2A) are fed to the second input of the oscilloscope 3 and start its sweep. Simultaneously with the appearance of the front of each even pulse at the second output of the 4 pulse generator, a pulse front is formed at its first output (Fig.2b), having a duration 1.2-1.5 times the sweep time of the oscilloscope 3. From the first output of the 4 pulse generator t7MnynbCbi are supplied to the input of generator 1 and to the first input of switch E. When a pulse is received at the input of generator 1, a radio pulse is generated at its second output (Fig. 2c) with a trapezoidal shape of the envelope of the radio pulse, and the duration of the envelope of the radio pulse. counted between the beginning of its front and the end of the decline, and 1.5-2 times less than the duration of the sweep of the oscilloscope 3. Sweep of the oscilloscope 3 takes place in the time interval from ti to 12 and from z to and. From the second output of the generator 1, the radio pulses arrive at the first input of the adder 5 signals, and from the first output of the generator 1 a sinusoidal signal with a frequency equal to the frequency of the carrier of the radio pulse, through the phase shifter b is fed to the input of the splitter 7 signals, from the nepsoio of the output of which part of the input signal is fed to the input meter 8 of the signal ratio, and from the second output of the signal splitter 7, part of the input signal goes to the second input of the adder 5 signals, From the output of the adder 5 signals, the signal goes to the second input of the switch 9 Output the switch 9 is connected to the second input only when the mm pulse arrives at the first input. The signal from the output of the switch 9 detector 2 is fed to the first input of the oscilloscope 3. The device blocks are turned on, the signal at the first output of the generator 1 yMenbUjaeTC.4 to values not exceeding 0.1 of the amplitude of the radio pulse at the second output of the generator 1, oscilloscope 1 is observed on the screen of the oscilloscope 3 (Fig. 3) a detected signal, a line of II scan and horizontal III risk. Lines and

(Fig. 3). IV (Fig. 4), V (Fig. 5) and VI (Fig. 6) scans are formed after the odd pulses 2 receive odd pulses from the second output of the oscillator 4. Oscillogram I determines

moments t5 and te of time, in the interval between which the instantaneous value of the waveform of the pulse reaches its maximum value. By adjusting the magnitude of the signal at the first output of the generator 1 and adjusting the phase shift of the phase shifter 6, the waveform Vil (Fig. 4) in the time interval -g from t to to is aligned with the scan line IV. Signal ratio meter 8 measures the signal. I do.

to his entrance. To measure the duration of the envelope of the radio pulse at a level of 0.5 of the amplitude of this envelope, the signal at the first output of the generator 1 is changed to a value at which the signal.

the signal ratio recorded by the meter 8 will become equal to Im / 2. The duration of the envelope of the radio pulse at the level of 0.5 is measured using an oscilloscope 3 (Fig. 5), it is equal to the time interval between

time instants t7 and t8. in which waveform VIII touches the scan line V. To increase the accuracy of measurements after combining the top of the waveform (figure 4) VII-line V scan and before

by measuring the value of Him, the deviation coefficient of the oscilloscope 3 decreases by a factor of 5 to 10 and the combination of eepiuviHb: oscillograms VII with the scan line iV is repeated by adjusting the value of the low-frequency signal

the first output of the generator 1 and adjusting the phase shift of the phase shifter 5. In this case, when measuring the duration of the radio pulse at the level of 0.5 on: l; the wound of the oscilloscope 3 is observed. only parts of the waveform IX (Fig. 6). touching scan line vi.

Claims (1)

SUMMARY OF THE INVENTION A device for measuring parameters of an envelope of radio pulses, comprising a pulse generator, a generator, a phase shifter, a signal splitter and a signal ratio meter, an adder whose inputs are connected to the second outputs of the 1st divider.