SU1161893A1 - Phase-meter of radio pulse signals - Google Patents

Abstract

RADIO IMPULSE SIGNAL PHASOMETER containing a source of coherent radio pulses connected over the air to the inputs of two radio pulse sensors, the first of which is connected to the first input of the phase comparison unit, the discriminator, the driver of the controlled time interval and the coincidence unit, which, in order to expand functionality by measuring the phase of individual oscillations within the frequency-modulated radio pulses, it is equipped with a driver for charging the time interval, while The output of the second sensor of radio pulses through a serially connected discriminator, a driver of a controlled time interval and a driver of a delay of a controlled time interval are connected to the first input of the coincidence unit, the second input of which is directly connected to the output of the radio pulse sensor, and the output of the coincidence unit is connected to the second input of the phase comparison unit.

Description

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The invention relates to radio measurements, in particular, to the control of the stability of individual oscillations inside radio pulses during the formation and management of radiation patterns of radar antennas.

It is known that when applying to Gunn diodes or avalanche-transit diodes of a powerful exciting video pulse, their intense warming up occurs, which leads to uncontrolled drift of the amplitude and phase of oscillations in a radio pulse. This drift must be measured and monitored, i.e. measure and control the amplitude and phase of individual oscillations in a radio pulse.

The purpose of the invention is the expansion of functional capabilities by measuring the phase of individual oscillations of internal frequency-modulated radio pulses.

FIG. 1 shows the block diagram of the proposed device; in fig. 2 time diagrams.

The device contains a source of coherent radio pulses (for example, a phased array active antenna), sensors 2 and 3 of coherent radio pulses (for example, superheterodyne common-oscillator receivers) j associated with source 1, a discriminator 4 (amplitude for radio pulses, frequency or phase for continuous -radiation, parts of the corresponding modulation), shaper 5 controlled time interval (for example, a single-stable multivibrator with a controlled, quasistability interval), shaper 6 delays pack Aulus emogo time interval, block 7 and block 8 of matching the phase comparing (analog or digital) ..

FIG. 2 shows the following timing diagrams: q - radio pulse at the output of the first sensor; L is the pulse at the discriminator output; C — formed video impulse of the required duration — video impulse delayed for the required time e — isolated oscillation from the radio impulse at the output of the coincidence unit; - radio pulse at the output of the second sensor.

A source of coherent radio pulses is associated with sensors 2 and 3 radio pulses. The output of the first sensor 2 radio pulses is directly connected to the first input of the coincidence unit 7 and through the serially connected discriminator 4, the driver 5 of the controlled time interval, the driver 6 of the delay of the controlled time interval is connected to the second input of the coincidence unit 7, the output of which is connected to the first input of the block 8 phase comparison, the second of which is connected to the output of the sensor 3 radio pulses.

The device works as follows.

A coherent radio pulse from source 1 is received and converted by sensors 2 and 3. A radio pulse (Fig. 2a from sensor 2 output by initial oscillation triggers discriminator 4. Video pulse (Fig. 2c) from the output of discriminator 4 is formed to the required duration comparable to the period of high-frequency oscillations in the converted radio pulse, shaper 5 controlled time interval Tu, and is delayed by the required time (within the duration of the radio pulse) shaper 6 delay controlled time interval Tj ....

A duration-generated and delayed video impulse (Fig. 2d) is fed to the input of a coincidence unit 7 as a resolver. A radio pulse (Fig. 2 a) is output to the other input of the coincidence unit 7 from the output of the same sensor 2.

In block 7 of coincidence, the selection of certain one or several high-frequency oscillations, relative to the beginning of the radio pulse, takes place (depending on the set duration and delay of the resolving video pulse). The high-frequency oscillation selected for analysis (Fig. 2e) is fed to the first (synchronizing) input of comparator unit 8 (for example, a two-channel oscilloscope). To the second input unit 8 receives the reference pulse from the sensor 3.

Thus, within the duration and temporal position of the permissive pulse, it is possible to match the amplitude and phase of the same oscillations in the radio pulses of the two sensors. There is no need to select the same oscillation.

from a radio pulse from another sensor, since the processes in the two channels of the comparison unit 8 proceed synchronously.

Adjustment of the duration and delay of the resolving video pulse in generators 5 and 6, as well as the comparison scale (for example, the oscilloscope sweep speed) in block 8 can be done either manually or automatically using the control unit. Phase comparison unit 8 can be analog or digital.

FIG. 2 shows a radio pulse (FIG. 2a) with internal frequency modulation (several high-frequency oscillations). The amplitude discriminator has a conditional threshold li p and the instant of operation at point 9. Impulse (Fig. 2c) at the output of amplitude discriminator A has a front defined by point 9 The temporary position of the falloff should not be equal to or more than the minimum period of radio pulses. The generated video impulse (Fig. 2c) with the help of the generator 5 of the controlled time interval has a duration T, which is set in accordance with the period of the studied high-frequency oscillation in the radio impulse.

The video pulse, delayed by the shaper 6 of the controlled time interval by time T, coincides in time with the vibration of the radio pulse being studied (Fig. 2a).

The high frequency oscillation (Fig. 2e) of the radio pulse (Fig. 2a) is highlighted at the output of the coincidence unit 7. If a two-channel oscilloscope is used as a phase comparison unit 8, then it is also on the oscilloscope screen. The start of the lead sweep at point 10 is determined by setting the threshold U (g). The beginning of the driven sweep is determined by the conjugate point 11. To the left of the points 10 and 11 (Fig. 2e and a) there are no images on the oscilloscope screen. No. 1 is it possible to measure the oscillation amplitudes and their phase shift cf.

When the locator is operating in continuous radiation mode with frequency modulation, the modification of the flowchart of FIG. 1 is to use a frequency or phase discriminator 1 instead of an amplitude discriminator 4.

Claims (1)

PHASOMETER OF RADIO PULSE SIGNALS, comprising a source of coherent radio pulses connected via ether to the inputs of two sensors of radio pulses, the first of which is connected to the first input of the phase comparison unit by a discriminator, a shaper of a controlled time interval and a coincidence unit, characterized in that, in order to expand functionality by measuring the phase of individual oscillations inside frequency-modulated radio pulses, it is equipped with a delay driver for a controlled time interval, with the output in orogo sensor radio pulses through series-connected discriminator generator managed time interval and the delay time interval managed generator coupled to the first input matching unit, the second input of which is connected directly to the output RF pulse sensor, and an output matching unit is connected to the second input of the phase comparator. SU ,, „1161893