SU1402961A1 - Raio pulse phase meter - Google Patents

Abstract

The invention serves to expand the frequency range and the range of durations of the measured radio pulse signals. The phase meter contains a trigger 1, a key 2, a digital indicator 3, a generator of 4 counting pulses, a control unit 11, a phase-equalizing unit 12 and limit amplifiers 9.10 in the phase meter channels. The decrease in the duration of the measured radio-pulse signals is due to the use of oscillatory circuits (K) 7.8, with variable Q-factor and equalizers 5.6, as well as the control unit 11 and the phase-equalizing unit 12 in the phase meter channels. ) is produced at its low Q (about one), i.e., it occurs quickly. At the same time, the discharge of K 7 (8), during which phase measurements are made, occurs at a high Q of K 7 (8) (more than a hundred), i.e. slowly in relation to its charge time. 2 Il. from 9 (L

Description

ISO

Od

The invention relates to radio engineering and is intended to measure the phase shifts of radio signals.

The purpose of the invention is to expand the frequency range and the range of the duration of the measured radio pulse signals.

Figure 1 shows the functional diagram of the radio pulse phase meter; Fig. 2 is a functional block diagram of the control unit.

The phase meter contains a series-connected trigger 1, a key 2 and a digital indicator 3, which is the output of the phase meter, as well as a generator of 4 counting pulses connected to the second input of the key 2 In addition, the series-connected interrupter is inserted into each of the two channels of the phase meter. (6) The signal input of which is the phase meter input, the oscillating circuit 7 (8) with variable parameters, the amplifier-limiter 9 (10), and also the control unit 11 common to the two channels of the phase meter, and the phase equalization unit 12, the inputs connected to the output limiting amplifiers 9 and 10 and the output to one of the inputs of flip-flop 1, the other input of which is connected to the first step of the control unit I1, the inputs connected to the outputs of limiting amplifiers 9 and 10, the second and third outputs of the control unit AND chopper inputs 5 and 6, the fourth and fifth with variable control input inputs 7 and 8, and the sixth output with digital input control input 3,

The control unit 11 comprises a series-connected adder 1 detector 14, a Schmitt trigger 15, first and second waiting multivibrators 16 and 17.

The phase meter works as follows,

In the initial state, before posting to the inputs of the phase meter of the measured radio pulse signals, the interrupters 5 and 6 are open, the oscillating circuits 7 and 8 with variable parameters have low durability, the switch 2 is locked and the counting pulses from the generator 4 counting pulses do not enter digital indicator 3. Radio pulse signals arriving at the phase meter inputs are passed in each channel

open breaker 5 (6), the oscillating circuit 7 (8), having a low Q, are amplified and limited in amplitude in the amplifier-limiter 9 (10). In this case, the tuning frequencies of oscillatory circuits 7 and 8 approximately correspond to the carrier frequency of the measured-signals, but are not equal to each other. The difference of their frequencies is equal to the value determined by the expression

fr

N s -. - - -.-- - h

- f

To

ku

0

five

0

five

0

five

0

five

where fp is the frequency of the pulse, the pulse of the generator of counting pulses;

tuning frequency of oscillatory circuits 7 and 8, respectively, in the measuring and reference channels of the phase meter;

at the same time n - 360 with a measurement resolution of 1 °, p - 3600 with a measurement resolution of 0.1. I

From the outputs of limiting amplifiers 9 and 10, the signals go both to the inputs of the control unit 11 and to the inputs of the phase-equalizing unit 12. When these signals appear at the inputs of the control unit 11, its operation is synchronized. From the outputs of limiting amplifiers 9 and 10, radio pulses enter the control blink 11, where they are summed up in the adder 13 and detected by the envelope detector 14. The pulses from the output of the detector 14 arrive at the Schmitt trigger 15, which is triggered on the leading edge of the pulses. By this differential, the information in digital indicator 3 is reset and the first pending multivibrator 16 is started, the pulse duration of which is chosen equal to the minimum duration of the measured radio pulse. The falling edge of the first standby multivibrator 16 triggers the second standby multivibrator 17, the pulse duration of which is set to (or slightly longer) the measurement time of the maximum phase difference. The front edge of this pulse is locked by the breakers 5 and 6, the quality switches of the oscillatory circuits 7 and 8 are switched (increased), the trigger 1 is switched by which the key 2 is opened, and the counting of the pulses of the counting pulse 4 is enabled. The trailing edge of the second standby multivibrator 17 system returns to its original state.

The measurement of the phase difference of the input signals begins when the key 2, controlled by the trigger 1, opens and the counting pulses from the generator 4 of the counting pulses begin to flow into the digital indicator 3, At the same time, the measured signals cease to flow to oscillatory circuits 7 and 8, and the latter begin to unload relatively exponentially with natural frequencies,, f. At the same time, the initial phases of these oscillations are equal to the phases of the signals at the outputs of the oscillating circuits 7 and 8 at the moment of time tj. Considering that the phase shifts in the channels of the phase meter from its inputs to the outputs of the oscillating circuits 7 and 8, you can write:

  -. where Cfj, t / i, are the initial phases of oscillations

the carrier input measured signals of the phase meter coming respectively to the inputs of the measuring and reference channels;

(Hm initial phases of own

oscillations of oscillatory circuits 7 and 8, respectively, of the measuring and reference channels at their discharge. Considering also the phase shifts in the amplifiers of the x-limiters 9 and Yu are the same, we can say that at the inputs of the phase-equalizing unit 12c of time t there are signals with initial phases having a difference equal to the phase difference of the input measured signals and with frequencies respectively fc f

The phase-matching unit 12 completes the pulse shaping function at the point in time when the phase difference of the input signals of the phase-matching unit 12 is zero. In general, the mathematical expression corresponding to this function of the phase-equalizing unit 12 will be written as

 ,) + d, - u (, Ct2-t,) -,

where u) (;, j, u) g are the circular frequencies of natural oscillations of oscillatory circuits 7 and 8, respectively, of the measuring and reference channels.

Hence, the time interval tj -tf, after which, after closing the chopper and increasing the Q of the oscillatory circuits, the Phaso-Equalizing Unit 12 produces a pulse, is determined by the expression

  -

2f (f f)

ch-c

.0

2Tff

n.

The pulse from the output of the phase-matching unit 12 is applied to the trigger 1 and switches it to a state in which the output voltage of the trigger 1 controlling the switch 2 locks it. As a result, the counting pulses from the generator 4 counting pulses cease to flow into the digital indicator 3.

Thus, the total number of counting pulses entering the digital indicator 3 during time t is determined by the expression

 .. N - "." - p.

This number exactly corresponds to the phase difference of the measured signals in units of discrete measurements. With a discrete value of 1 p 360 and N exactly corresponds to the measured phase shift in degrees.

The measurement cycle of the phase meter ends by setting it back to its original state upon termination of the measured radio pulse signals and the phase meter measurement process (determined in control unit 11 from preliminary information about the duration of the radio pulses). . Based on the foregoing, the frequency capabilities of the proposed phase meter are limited to the frequency range of the measuring channels (interrupters 5 and 6, oscillatory circuits 7 and 8, limiting amplifiers 9 and 10, and the phase-equalizing unit 12 of the phase meter), which are currently implemented at frequencies of the order of hundreds megahertz. At the same time, the digital part of the phase meter (trigger 1, key

2, the generator 4 is counting pulses, the Digital indicator 3) operates at relatively low frequencies fr n (- f km) and is easily realizable.

The decrease in the duration of the measured radio-pulse signals is due to the use of oscillatory circuits 7 and 8 with a variable quality factor, in which the energy supply of the Oscillating circuit 7 (8) is produced at its low quality factor (about one), i.e. going fast. At that time, the discharge of an oscillatory junction 7 (8), during which phase measurements are produced, occurs at a high Q (more than 3), i.e. slowly relative to the time of his charge.

 The use of the invention makes it possible to extend the frequency range of the KB side of the frequency increase) and the range of durations (downwards durations) of the measured {) radio pulse signals with different ratios of the number of periods of high-frequency pulse filling and pulse duration.

Isolation Formula

I

I Radio pulse phase meter containing successively connected trigger, key and digital indicator, and

also a counting pulse generator, connected to the second key input,;, and the first and second limiter amplifiers, characterized in that, in order to expand the frequency range and the range of durations of the measured radio pulse signals, in series of two channels, phase meters are connected in series The transmitter, the signal input of which is connected to the input terminal of the phase meter, and the oscillating circuit with variable parameters, as well as the control unit and the phase-equalizing unit common to the two channels of the phase meter, are connected with the outputs of the limiting amplifiers, and the output with one of the trigger inputs, the other input of which is connected to the first output of the control unit, the inputs connected to the outputs of the limiting amplifiers, while the second and third outputs of the control unit are connected to the control inputs of the choppers, the fourth and fifth - with the control inputs of oscillating circuits with variable parameters of both channels of the phase meter, and the sixth - with the controlling input of a digital indicator, while the outputs of oscillating circuits with variable parameters connected to the inputs of limiter amplifiers.

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Claims (1)

claims A radio pulse phase meter, containing a trigger, a key and a digital Indicator in series, as well as a counting pulse generator connected to the second input of the key, and the first and second limiting amplifiers, characterized in that, in order to expand the frequency range and the duration range of the measured radio pulse signals, in each of the two channels of the phase meter, a breaker is connected in series, the signal input of which is connected to the input terminal of the phase meter, and an oscillating circuit with variable parameters as well as a control unit and a phase comparison unit common to the two channels of the phase meter, the inputs connected to the outputs of the limiter amplifiers, and the output to one of the trigger inputs, the other input of which is connected to the first output of the control unit, the inputs connected to the outputs of the limiter amplifiers, the second and third outputs of the control unit are connected to the control inputs of the choppers, the fourth and fifth to the control inputs of the oscillating circuits with variable parameters of both channels of the phase meter, and the sixth with the control in the course of the digital indicator, while the outputs of the oscillatory circuits with variable parameters are connected to the inputs of the amplifier limiters. ~ 1402961 (rig, 2