RU1810992C - Pulse discriminator - Google Patents

Abstract

Application: the device relates to radio engineering and can be used for analysis and measurement of parameters of pulse sequences, in particular for the selection of signals of multi-frequency transmitting devices. The inventive device contains bandpass filters 1, 20, pulse shapers 2, 5, 16, 21, triggers 3, 7, 18, 22, tunable frequency filters 4.15, key elements 6, 17, elements And 8, 19. source an input signal 9, a step voltage generator 10, a differentiating element 11, an adder 12, a threshold element 13, a recording element 14 with corresponding connections. 3 ill.

Description

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The device relates to radio engineering and can be used to analyze and measure parameters of pulse sequences, in particular, to select the needles of multi-frequency transmitting devices.

The purpose of the invention is to improve the operational stability of the selector.,

In FIG. 1 is a structural circuit diagram of the device in question for FIG. 2 and 3 are temporary diagrams that explain his work.

The pulse selector contains: 1 and 20-band filters, 2, 5, 16, 21 - pulse shapers, 3, 7, 18, 22 - triggers; 4, 15 - tunable frequency filters; b, 17-key elements; 8, 19-elements And, 9 - input signal source, 10 - step voltage generator, 11 - differentiating element, 12 - adder, 13 - threshold element, 14 - recording element ..

Moreover, the first output of the signal source 9 through a series-tunable tunable frequency filter 4, a pulse shaper 5, the key element 6 and the trigger 7 is connected to the first input of the adder 12, the Installation input of the trigger 7 through the element And 8 is connected to the first input of the recording element 14. The first output of the source signal 9 through a series-connected bandpass filter 1, pulse shaper 2 and trigger 3 are connected to the control input of the key element b. The second output of the signal source 9 through a series-connected tunable frequency filter 15, a pulse shaper 16, a key element 17, and a trigger 18 is connected to the second input of the adder 12. The input of the installation of the trigger 18 through the element And 19 is connected to the second input of the recording element 14. The second output of the source signal 9 through a series-connected bandpass filter 20, a pulse shaper 21 and a trigger 22 connected to the control input of the key element 17. The output of the step voltage generator 10 is connected to the inputs of the control laziness tunable frequency filters 4 and 15 and differentiating element 11c via the reset inputs of flip-flops 3, 7, 17, 18. The output of the adder via a threshold element 13 is connected to the second inputs of AND gates 8 and 19.

The pulse selector operates as follows;

In the absence of interference pulses, the video pulses from the output of each channel of the signal source 9 (Fig. 1) are simultaneously tuned to a given

the frequency range of the pulse repetition frequency filters 4 and 15. The tuning of these frequency filters is carried out due to the control voltage (Fig. 2a).

step voltage taken from the generator 10. The tuning of filters 4 and 15 begins with the lowest pulse repetition rate. The device detects signals of multifrequency pulse transmitting devices with a random change in the carrier frequency from pulse to pulse and with a random duration of the pulses themselves. It is assumed that at each of the possible carrier frequencies, the pulse repetition period is the same and constant. When tuning the frequency filters 4 and 15, the spectral components of the total pulse flux from the output of each individual channel of the receiver fall into their passband. If a multi-frequency signal of the above type is received, then, for example, the first harmonics the spectrum of the received5 signal (Fig. 3a, c). Note that in FIG. Figure 3 shows the voltage diagrams for only two selector channels. The selected harmonic components are fed to pulse shapers 5 and

0 16, where the pulse sequences are generated (Fig. 36, d), at the moment of crossing the harmonic components (Fig. 3a, c), of the zero level. Formed pulses through open in the original

In state 5, the key elements b and 17 are sent to triggers 7 and 18, respectively, and the first pulse transfers the triggers to a single state (Fig. 3c, f), the triggers do not respond to all subsequent pulses. The output voltage from the flip-flops 7 and 18 is applied to the adder 12, where the total voltage (Fig. 3g) is generated, which is applied to the threshold element 13, When this voltage exceeds Unop (Fig. 3g)

5 it arrives at the second inputs of the elements And 8 and 19, the first inputs of which are simultaneously supplied with pulses from the outputs of the key elements 6 and 17, which then arrive at the recording element 14. Time analysis

0 tc (Fig. 2a) at a given pulse repetition rate is determined by the duration of transients in filters 4 and 15, and the pulse analysis time with a given pulse repetition rate. Every analysis cycle

5 ends by transferring the triggers 7 and 18 to the zero state by pulses (Fig. 26) from the output of the differentiating element 11.

Thus, the principle of operation of the device is based on the fact that when selecting multi-frequency signals with a random law of the carrier frequency change from pulse to pulse and their random duration, but with a fixed pulse repetition period at each frequency, the probability of the simultaneous appearance of K outputs from N source 1 during the analysis, pulses with the same repetition period from various single-frequency transmitting devices are very small. Therefore, the total voltage at the input of the threshold element 13 will not exceed the set threshold Unop (Fig. 3g) and pulses from the output of the key elements 6 and 17 to the recording element 14 are not received. The threshold value is selected on the basis of the pulses of which transmitting devices we want to select: one, two, three or k-frequency.

When a continuous spectrum pulse, for example, a single pulse or chaotic pulse noise, appears at one or several of the outputs of source 1, a response arises both in tunable frequency filters 4 or 15 and bandpass filters 1 or 20. The upper boundary frequency of the filter passband 1 and 20 are chosen below the lowest possible pulse repetition rate of multi-frequency transmitting devices at each frequency, therefore, if there are signals of multi-frequency means at the input of these filters, the response to them Exit offline, since neither the first nor the higher spectral components of the discrete spectrum regular sequence to the filter output 1 and 20 do not pass.

In response to interfering pulses, shapers 2 or 21 are triggered, with pulses from the output of which triggers 3 or 22 are brought into a single state. The voltage from the outputs of triggers 3 and 22 is applied to the key elements 6 or 17 and locks them. As a result, the response to the interference from the pulse shaper 5 or 16 does not pass to the triggers 7 and 18 and to the recording element 14. In addition, since the voltage from the trigger of the channel where there is interference is not applied to the adder, there will be no false exceeding the set threshold in the threshold element 13, and therefore, those channels in which there are signals of multi-frequency sources, but with less radiated frequencies, will not be opened for registration. than determined by the threshold element.

Thus, the device under consideration, in comparison with the prototype, provides an increase in the noise immunity of the selector operation in the presence of interference pulses of any origin at its input. 0

Claims (1)

The claims A pulse selector containing an input signal source, each of N outputs of which is connected to a tunable frequency filter and a first pulse shaper, a recording element, the inputs of which from the first to the Nth are connected to the outputs of the corresponding from the first to the Nth elements AND the first inputs of which are connected through a threshold element to the output of the adder, the inputs of which from the first to the Nth are connected to the outputs of the corresponding 5 first triggers from the first to the Nth, the installation inputs of which are connected to the second inputs of the corresponding elements And from the first to the Nth, and the reset inputs to the output of the differentiating element, the input of which is connected to the output of the step voltage generator and the control inputs of the corresponding tunable frequency filters from the first to N, and the result is that, in order to increase the noise immunity of the operation, N band-pass filters, N second pulse shapers, N second triggers, N key elements are introduced into it , and to each trunk N outputs the input source connected via posledova0 Tel'nykh corresponding bandpass filter, a second pulse generator and a second flip-flop is connected to the control input of a corresponding core element, which is connected to the output 5 each of the N channels with the second input of the corresponding element And, and the information input of the key element is connected to the output of the corresponding first pulse former, reset input of the second 0 trigger in each of the N channels is connected to the output of the differentiating element. Fig. I