SU1707563A1 - Device for determination of short-time instability of frequency and duration of pulse radio signal - Google Patents

Abstract

The invention relates to a radio measuring technique and can be used to determine the frequency and time parameters of high frequency pulsed radio signals. The purpose of the invention is to expand the functionality by determining the short-term frequency instability and duration of pulsed radio signals from autonomous sources during a single radio pulse over a single array of measured values of the period of the signal under investigation, converted into a low frequency range. The clock pulse generator 11 and the time selector 12 are entered into the device. The device contains a converter 1, a calculator 2 of the mean square value of the short-term frequency instability,,: gg. Period 3, the memory block), the arithmetic unit 5, the register 6, reference oscillator 7, amplitude detector 8, comparator 9, pulse-formers; owls 10 and 11. 3 ill. about. € SL

Description

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The invention relates to a radio measuring technique and can be used to measure the frequency and time parameters of high-frequency pulsed radio signals.

The purpose of the invention is the extension of functionality due to the simultaneous determination of the short-term frequency instability of impulse radio signals from autonomous sources (the trigger circuit of which is not associated with the measuring device) from the results of one measurement cycle.

and the duration of these pulsed radio signals will be 15).

Fig „1 shows the structural scheme of the proposed device; But FIG. 2 and 3 are timing diagrams explaining the principle of operation of the device. 20

The device contains serially connected input converter V, calculator 2 of the mean square value of short-term s (frequency instability, containing a 3-period meter, memory block, arithmetic unit 5 and recording unit 6, reference generator-7, the output of which is connected to the second input of the input converter 1, an amplitude detector 8 connected in series, a comparator 9 and a pulse shaper 10, the output of which is connected to the control input of the calculator 2, the rms value of short There is constant frequency instability, the driver of 11 pulses, the output of which is connected to the input of the temporary selector 12, the input of which is connected to the output of the comparator 9, and the output to the input of the launch of the arithmetic unit 5.

The device works as follows, i

Impulse radio signal l arrives

To the first input of the converter 1 and simultaneously to the input of the amplitude detector 8 (diagram a in Fig. 2), the second input of the converter 1 receives a signal from the output of the reference oscillator 7. From the output of the converter 1, the signal under investigation, the converted D band of low frequencies, goes to signal input digital meter 3 periol. The unit-specific detector-znamy signal under study from the output of the amplitude detector 8 i is fed to the input of the comparator 9, to

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the output of which is formed by a pulse, the duration of which is the pulse duration of the signal of the signal (the diagram b of the video pulse from the output comes to the input of the time clock 12, which passes for a time equal to the duration of the radio signal from the form output 11 pulses to the input of the blocks 3 periods (diagram and diagram a in Fig. 3,

With the arrival of each pulse, the meter 3 measures the measured value n of the number specified in it) of the converted radio signal (the diagram and transmits the value of the measurement (in the digital code) in the minute (the diagram in FIG. A of the value of the transformed period After the end of the radio signal under study 9, the generator shifts, the pulse of which, through the control input of unit 5 of this control impulse end and signal, and also the process of storing data in block 5, initiates the unit k ne edachu array accu- m rezultatoo measuring pulse investigated this block B is determined by the magnitude of the test ELF rms audio pulses diosignala any ESTATE pulse (including, in its tse n) by the formula

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where 1Ј men and II are numbers, the numbers of the irradiatory T are chosen; eaten N;

in ° C time stretched),

the output of which is formed by a video pulse whose duration is equal to the pulse duration of the signal i being studied (diagram b in Fig. 2). This video pulse from the output of the comparator 9 is fed to the input of the temporary selector 12 ,. which passes at the same time for the time equal to the pulse duration of the radio signal under study, the clock pulses from the output of the imaging unit 11 pulses, to the trigger input of the meter 3 periods (chart in Fig 2 and chart a in Fig. 3, where the scale

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With the arrival of each clock im-. pulse meter period 3 measures the value of the period (or the number of K periods specified in it) of the transformed radio signal under study (the diagram is shown in Fig „3) and transmits the value of the measured value (in digital code) to the memory block (-diagram in FIG 3). In memory block A, the values of the measured period values of the transformed radio signal are memorized and accumulated. At the end of the radio signal pulse, the comparator 9 pulls the pulse shaper 10, the pulse of which is fed to the control input of the block 5. With the arrival of this control pulse, corresponding to the end of the signal being examined , and only in the process of measurement and accumulation of data in block 4 of the step. In this case, block 5 initiates a memory block k for transmitting an array of the measured signal accumulated during a pulse of measurement result B. Block 5. In this block, the relative magnitude of the RMS ELF value of the pulse signal studied in any part of the radio pulse is determined (including at the beginning and in the end of it) according to the formula

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where 1Ј men b II are numbers defining the chosen sequence numbers of signs of measured values of period T; in an array of volume N;

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np yyyf part of the signal under study for a separate measurement (2); .

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f - p f. average value

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the frequency of the signal under study in the region from; m-ro to the n-th measurement (3);

f pp is the conversion frequency in converter 1.

In addition, in the computing unit, the change in the frequency of the pulse, as well as the duration of the pulse T, is determined as the time equal to the product of the number of measured values of the frequency (period) of the signal under investigation by the duration of the period of clock pulses.

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All operations in block 5 are performed automatically in a short time determined by its speed.

The results of calculations of all necessary parameters, and such (if necessary) the entire array of values of measured values of T; (and f) are then registered in block 6 registration

The device makes it possible to determine the ELF in the pulse section of the signal under study (including at its beginning and at the end, with an appropriate choice in the formula of (1) values of the spike array elements), and also the pulse duration. The advantages of the proposed device are especially significant when studying single and rarely repeating pulses, as it allows to determine the desired parameters for one pulse

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In addition, the automation of the procedure for processing the measurement results allows tens and hundreds of times as compared with the known device to reduce the time required to determine the desired parameters of the radio signals under study.

As calculator 2, a computing frequency counter at-50 can be used.

Formula of invention

A device for determining the short-term frequency instability and duration of a pulsed radio signal, containing a series-connected reference oscillator, an input transducer and a mean-quadratic value calculator of a short-term frequency instability connected in series and connected to the device input calculator of the mean-quadratic short-term frequency instability Characterized in that, with the aim of expansion of functionality, it introduced a second series-connected pulse generator and the time selector, a second input coupled to the second output of the comparator, and its output connected to the trigger input of the mean-square value calculator. short-term frequency instability.

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Claims (1)

Claim Device for determining short-term frequency instability and duration of a pulsed radio signal, comprising a series-connected reference generator, an input converter and a calculator of the rms value of a short-term frequency instability, an amplitude detector, a comparator and a pulse shaper, the output of which is connected to the control input of the calculator values of short-term frequency instability, exc sistent in that, in order to expand the functional capabilities, it introduced a second series-connected pulse generator and the time selector, a second input coupled to the second output of the comparator, and its output connected to the input trigger calculator rms. short-term frequency instability.