SU1118932A1 - Radio-pulse phase-meer - Google Patents

Abstract

A RADIO IMPULSE PHASOMETER containing a first amplitude detector, a first AND second threshold element, a first measuring channel consisting of a phase locked loop (PLL) and a first mixer, a second measuring channel consisting of a second mixer, a local oscillator and a phase meter connected to the measurement outputs channels, which means that, in order to increase noise immunity while simultaneously separating signals by channels, a second amplitude detector, two single-oscillators, t a rigger, four keys; in this case, the first filter and the fifth key are inputted to the first measuring channel; its input is connected to the upper input of the PLL unit. The output is connected to the input of the first mixer, the output connected to the input of the first filter, and the output of the last one measuring channel, and a second filter is introduced into the second measuring channel, the output of which is the output of the second measuring channel, and the input is connected to the output of the second mixer, while the second inputs of the mixers are connected to the outputs of the local oscillator, high-frequency The inputs of the first, second, third, and fourth switches are connected to the input terminal of the phase meter; the output of the first switch is connected through the first amplitude detector and the first threshold element connected in series to the input of the first one-oscillator and the control inputs of the second switch (O and the PLL); with the output of the second key, the output of the third key is connected through the second amplitude detector connected in series and the second threshold element is connected to the input of the second one-vibrator and the control inputs h the fourth and fifth keys, while the output of the fourth key is connected to the input of the second mixer, and the outputs of one-shot 00 are connected respectively to the inputs of the device, about i sets zero and the trigger unit, the direct: AE d and inverse outputs of which are connected to the control the inputs of the first and third keys.

Description

The invention relates to a measuring technique and can be used in radio engineering phase systems. A radio pulse phase meter is known that contains two channels, each of which consists of a serially connected input unit and a mixer, the output of which is connected to a phase indicator, and the heterodyne inputs of the mixers are connected to a tunable generator common to both channels 1. The disadvantage of this phase meter is a significant measurement error with a high duty cycle and a short duration of radio pulses, due to the fact that in this case the phase indicator averages a limited amount of data on the phase shift. Also known is a radio pulse phase meter containing two input units, two mixers, two measuring channels connected by their first inputs to the mixers, and outputs with a phase indicator, two delay lines, an amplitude detector, an amplifier limiting device and a reference oscillator (heterodyne), and the outputs of the first and second inputs the blocks are connected via the first and second delay lines respectively to the first inputs of the first and second mixers, the output of the first input block through the series-connected amplitude detector and limiter connects yen to the second) channel inputs, the outputs of the reference generator are connected to the third and fourth inputs of each of the two channels, the output of each channel is connected, respectively, 1O to the heterodyne input of the first and second mixers, each of the measured. the first and second phase detectors phase shifter, threshold device, adjustable oscillator, control element, control key, memory device, control voltage driver and adder, the first inputs of the first and the second phase detector are connected to the mixer outputs, and the output of the first phase detector through the control key and the storage device is connected to the first input of the sum of the matrix, the second input of which through the consequently connected control driver and the threshold device phase detector, the second input of which is connected to the output of the phase of the rotator, the output of the adder through the control element is connected to the input of the adjustable generator zJ. However, this phase meter is characterized by under-current noise immunity in the case of interference in the interval between radio pulses, due to the possibility of false alarms due to the passage of interference through the input blocks and delay lines to the mixers of both measurement channels. In addition, the phase meter does not provide for the distribution of the input information over the measuring channels in the event that the reference and signal radio pulses follow the same channel. The purpose of the invention is to increase the noise immunity while simultaneously separating the signals in two channels. To achieve this, a radio pulse phase meter containing a first amplitude detector, first and second threshold elements, a first measuring channel consisting of a PLL unit and a first mixer, a second measuring channel consisting of a second mixer, a local oscillator and a phase indicator connected to the outputs of the measuring channels, a second amplitude detector, two single vibrators, a trigger, four keys are additionally introduced, the first filter is entered into the first measuring channel, and the fifth key, whose input is connected to the output home of the PLL unit, and the output is with the input of the first mixer, the output connected to the input of the first filter, and the output of the latter is the output of the first measuring channel, and the second filter has the second filter, the output of which is the code of the second measuring channel, and connected to the output of the second mixer, while the second inputs of the mixers are connected to the outputs of the local oscillator, the high-frequency inputs of the first, second, third and fourth keys are connected to the input terminal of the phase meter, the output of the first key through the first amplitude detector and the first threshold element are connected to the input of the first single vibrator and the control inputs of the second key and the PLL unit; the input of the latter is connected to the output of the second call, the third key output is connected through the second connected amplitude element and the second threshold element

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the output of the second one-shot and control inputs of the fourth and fifth keys, while the output of the fourth key is connected to the input of the second mixer, and the output of the one-shot are connected respectively to the inputs of the zero setting and the trigger unit, the direct and inverse outputs of which are connected to the control inputs of the first and third keys.

FIG. 1 shows a block diagram of a radio pulse phase meter; in fig. 2 - diagrams explaining his work.

The radio pulse phase meter contains the first key 1, the second key 2, the third key 3, the fourth key 4, the first amplitude detector 5, the first threshold element 6, the first single vibrator 7, the first measuring channel 8, the trigger 9, the second amplitude detector 10 the second threshold element 11 , the second one-shot 12, the second measuring channel 13, the local oscillator 14, the phase indicator 15. The second measuring channel 13 includes a mixer 16 and a filter 17. The first measuring channel 1 8 includes a PLL unit 18, a fifth key 19, a mixer 20 and filter 21.

The high-frequency inputs of the first key 1, the second key 2, the third key 3, the fourth key 4 are connected to the input terminal of the phase meter. The output of the first key 1 is through a series-connected amplitude detector 5 and the threshold element 6 connected to the control inputs of the key 2 and the PLL unit 18, as well as to the input of the one-shot 7. The output of the one-shot 7 is connected to the input of the zero-setting trigger 9, the output of the third key 3 through a series-connected amplitude detector 10 and a threshold. element 11 is connected to the control inputs of the fourth and fifth keys 4 and 19, as well as to the input of the one-shot 12. The output of the one-shot 12 is connected to the installation input of the unit trigger 9. Connect the output of the trigger 9 to the control input of the first key 1. Inverse trigger output 9 is connected to the control input of the third key 3. The output of the second key 2 is connected to the signal input of the first measuring channel b. The output of the fourth key 4 is connected to the signal input of the second measuring

channel 13. The heterodyne inputs of the measuring channels 8 and 13 are connected to the local oscillator 14, and the codes of the measuring channels 8 and 13 are connected to the phase indicator 15. In the second measuring channel 13 one input of the mixer 16 is connected to the signal input of the channel 13, and the other input to the heterodyne input of the channel 13. To the output of the mixer 16 a filter 17 is connected, the output of which is the output of the measuring channel 13. In the first measuring channel 8, the signal and control inputs of the channel are connected to the same inputs of the PLL unit 18, the output of which is connected to input key 19. The output of key 19 is connected to one input of a frequency mixer 20, the other input of which serves as the heterodyne input of the first measuring channel 8. The output of the mixer 20 is connected to the input of the filter 21, the output of which is the output of the first measuring channel 8, and the inhibiting input of the first channel 8 is connected to the control input of the key 19.

. Radio pulse phase meter works as follows.

The PLL unit 18, consisting of a phase detector connected to the PLL loop, a key, a storage unit, a control element, and a tunable oscillator, adjusts to the high-frequency filling of the radio pulse signal in the presence of a high potential at its control input.

Otherwise, the PLL unit 18 is disconnected from the signal input of channel 8 and operates in the storage mode of the high-frequency filling phase of the previously active radio pulse.

In the initial state on the Direct output of the trigger 9 there is a signal 1, on the inverse output of the trigger 9 there is a signal O, the outputs of the threshold elements 6 and 11 contain the signals 0. Thus, the first key 1 is open and the second key 2, the third key 3 and fourth key 4 closed. Therefore, the signal inputs of the measuring channels 8 and 13 do not receive signals. Phase indicator 15 shows zero phase shift.

Radio pulses are input to the phase meter in pairs in the form shown in FIG. 2ot, and between the first and second radio pulses. as well as between individual pairs of pa, dio pulses, interference is always present,. which, in the intervals between radio pulses, can distort the measurement results of phase shifts; Let the post: phase saw a pair of radio pulses, between the high-frequency fillings of which you want to measure the phase shift. The first of the received radio pulses through the open first key 1 enters the input of the amplitude detector 5, the voltage of the output of which repeats the shape of the envelope of the radio pulse (Fig. 25). When the voltage at the output of the detector 5 reaches the actuation level of element 6, a signal 1 appears at its output {Fig. 2 c), which opens the second key 2 and enters the control input of the measuring channel 8, preparing the PLL block 18 for operation. Through the open the second key 2, the first radio pulse (Fig. 2k) passes to the signal input of the measuring channel B, as a result of which the PLL 18 is switched on. At the end of the first radio pulse at the output of the threshold element 6 of the signal 1, it goes into the signal O, which from the output of the threshold element 6 closes the second key 2 and places the PLL unit 18 in the storage mode of the high-frequency radio pulse phase. Thus, the signal input of the measuring channel 8 signals and interference do not act on the PLL unit 18 and do not interfere with its operation in the phase storage mode. At the moment of transition at the output of the threshold element 6 1 to O. the single vibration 7 produces a short pulse (Fig. 2-U), which enters the input of the zero setting of the trigger 9 At the direct output of the trigger 9, the signal O appears (Fig. 2 E ), and on the inverse output of the trigger 9 appears 1 (Fig. 2 and). The signal O from the direct output of the trigger 9 closes the first key 1 and thereby prevents the second radio pulse and the mech from arriving at the input of the amplitude detector 5. The signal 1 from the inverse output of the trigger 9 opens the third key 3, preparing the phase meter to receive the radio pulse. When the second radio pulse arrives at the phase meter input, the latter follows the open third key 3 ha input of the amplitude detector 10, the output voltage of which repeats the shape of the radio pulse envelope (Fig. 2 e). When the voltage at the output of the amplitude detector 10 reaches the trigger level of the threshold element 11, a signal 1 appears at its output (Fig. 2, X), which opens the fourth key 4 and passes the second radio pulse to the signal input of the measuring channel 13 (Fig. 2l) ) In addition, the signal from the output of the threshold element 11 enters the prohibitive input of the measuring channel 8 and opens the key 19. Thus, the mixer 20 receives a signal from the output of the FLPCH unit 18, and the mixer 16 receives the high-frequency filling of the second radio pulse under study. In the measurement channels 8 and 13, the phase shifts are transferred to the intermediate frequency signals, which are allocated by the filters 17 and 21. The intermediate frequency signals are fed to the phase indicator 15, where the phase shift is measured and indicated, and the measurement takes place as long as the input The phase meter has a second radio pulse. At the end of the studied radio pulse at the output of the threshold element 1 1, the signal 1 goes to O (fig.- 2g), which from the output of the threshold element 11 closes the fourth key 4 and the switch 19. At the moment of the signal transition to O, the single vibrator 12 forms a short pulse (fig 23), which enters the installation input of the trigger unit 9. Thus, signal 1 (Fig. 23) appears on the forward output of the trigger 9, opening the first key 1, and on the inverse output of the trigger 9 the signal O appears (Fig. 2 and), closing the third key. The phase shift measurement cycle ends there. At the end of the measurement cycle, the second key 2 and the fourth key 4 are closed, therefore the interference does not affect the measuring channels B and 13 and cannot distort the measurement result recorded in the phase indicator 15. The first key 1 is open at the end of the measurement cycle and thus the device is ready for the next measurement cycle. Commands that allow the passage of input signals into the measuring channels are served to the second key 2 and the fourth key 4 only when

entering the device of the next pair of radio pulses, and as a result, false alarms of measuring channels 8 and 13 are prevented. In addition, the proposed device allows the following channels to be distributed over one channel. The first (reference and second radio pulses under study are two different channels of the phase meter).

The use of new elements and communications favorably distinguishes the proposed

device from the known: it becomes possible to measure phase shifts between high-frequency, radio pulse fillings, following both one and two channels; the noise immunity of the device is increased, since the interference affects the measurement channel channel for a year, equal to the duration of the radio pulse, which reduces the interference power.

figure 1

Claims (1)

A RADIO PULSE PHASOMETER containing a first amplitude detector, first and second threshold elements, a first measuring channel, consisting of a phase locked loop (PLL) and a first mixer, a second measuring channel, consisting of a second mixer, a local oscillator and a phase indicator connected to the outputs of the measuring channels , it is noteworthy that, in order to increase the noise immunity while simultaneously separating the signals along the channels, a second amplitude detector, two one-shot oscillators, and triggers are additionally introduced into it er, four keys, while the first filter and the fifth key are introduced into the first measuring channel, the input of which is connected to the output of the PLL, and the output is connected to the input of the first mixer, the output connected to the input of the first filter, and the output of the last is the output of the first measuring channel and a second filter is introduced into the second measuring channel, the output of which is the output of the second measuring channel, and the input is connected to the output of the second mixer, while the second inputs of the mixers are connected to the outputs of the local oscillator, the high-frequency inputs are the first, second, third and fourth keys are connected to the input terminal of the phase meter, the output of the first key is connected in series through the first amplitude detector and the first threshold element is connected to the input of the first one-shot and the control inputs of the second key and the PLL, the input of the last connected to the output of the second key , the output of the third key through the second amplitude detector and the second threshold element connected in series with the input of the second one-shot and the control inputs of the fourth and fifth on the keys, while the output of the fourth key is connected to the input of the second mixer, and the outputs of the one-shot are connected respectively to the inputs of the zero and trigger units, the direct and inverse outputs of which are connected to the control inputs of the first and third keys. 1 1118932