SU1102028A1 - Pulse-repetition period selector - Google Patents

Abstract

PULSE SELECTOR DURING A REPEATING PERIOD, holding the first mechanical device and the first pulse separation device connected in series, the OR element, the delay element, the gate driver and the first AND element whose second input is connected to the first pulse, the output is connected to the output bus , vhbdom dumping gate generator and the second input element OR, the third input of which is connected to the intermediate output of the gate generator, the output of which is connected to it, with the counting input ne rvogo re. the device, in addition to the reset inputs of the first pulse selection device and the delay element, are combined, t i and h a y n ii, and so that, in order to improve the reliability of the selection, when selecting a given sequence of pulses among periodic signals with multiples of repetition periods, He entered the second element And the second recalculation device-o, the counting input of which is connected to the output bus, the reset input - to the output of the first recalculation device and the first input of the second element And, the second input of which is connected to You (О With the second counting device stroke, and the output is with the reset delay input input.

Description

The invention relates to a pulse technique, in particular to pulse selectors, and can be used. Called in radio systems to isolate an Aperiodic pulse train against interference.

The closest in technical essence to the invention is a pulse collector for a repetition period, comprising a scaling device and a first pulse extraction device connected in series, an OR element, a delay element, a gate driver and an And element, the second input of which is connected to the earphone the first pulse, the output with the output bus, the reset input of the gate driver and the second input of the OR element, the third input of which is connected to the intermediate output of the gate driver, the output of which is connected to the counting input of the counting device, the reset input of which is connected to the output bus; the output of which is connected to the reset input of the first pulse extraction device and the reset input of the delayed element Cl.

A disadvantage of the known device is low reliability of selection when selecting a given sequence of pulses among periodic signals / 1s with multiple repetition periods.

The purpose of the invention is to increase the reliability of selection when selecting a given sequence of pulses among periodic signals with multiple repetition periods. The goal is achieved by the fact that the pulse selector by repetition period contains the first scaler and the first pulse separation device connected in series, the OR element, the delay element, the gate driver, and the first AND element whose second input is connected to the input bus and the input of the first selection device pulse, output - with the output bus, the reset input of the gate generator and the second input of the OR element, the third input of which is connected to the intermediate output of the gate generator, the output of which connected to the counting input of the first scaler, the reset inputs of the first pulse separation device and the delay element are combined, a second AND element and a second counting device are introduced, the counting input of which is connected to the output bus, the reset input is connected to the output of the first scaler and the first input The second element And, the second input of which is connected to the output of the second counting device, and the output to the reset input of the delay element.

Fig. 1 shows a structural electrical circuit of the device; in fig. 2 - time diagrams that show his work.

The selector comprises a device 1 5 for selecting the first pulse, an element. OR 2, delay element 3, the shaper of 4 gates, the first element and 5, the first mixing device 6, the second element And 7, the second recalculation device 8, the input bus 9 and the output bus 10.

The selection device of the first pulse 1, the element OR 2, the delay element 3, the gate driver 4, the element 5 is connected in series, the second input of the element 5 is connected to the input bus 9 and to the input of the selection device of the first pulse 1, the reset input of which is connected to element reset input

0 delay 3 and the output element And 7. The output of the imager 4 is also connected to the counting input of the counting device 6, the output of which is connected to the first input of the element And 7 and the input

5 reset counting device 8, the counting input of which is connected to the output bus 10, the output element and 5, the reset input of the imaging unit 4 and the second input element OR 2,

Q whose third input is connected to

intermediate output driver 4. The second input element And 7 is connected to the output of the counting device 8.

 The device works as follows.

The timing diagram (Fig. 2) presents the case when the selector is configured to select pulses with a repetition period T with zah0 vatil false sequence of pulses with a repetition period T,. multiple of TC, in this case for example T 2 T. The dotted line shows the pulses of a given sequence

5 (Fig. 2 "1.

The first input pulse is extracted by device 1 and through the OR 2 element triggers delay element 3 (Fig. 2c), which delays the signal by the amount

ir

where tf. - expected follow-up period

pulses;

  the duration of the strobe.

Through time 1; from the moment of arrival of the first pulse, the driver 4 is started, which opens the element And 5. The next pulse with

the input bus 9 will no longer pass through the device 1, but will pass through the open-element AND 5 to the output bus 10 provided that this unit is in the gate. Shaper 4

forms a strobe of duration -fcc FIG. 2cj and marks the middle of the strobe with a signal at its intermediate output (FIG. 2). At the moment of resetting the shaper 4, the strobe terminates, closing element 5. Since the selector started a false pulse with a period T 2 T, it does not enter the first strobe pulse. and the delay element 3 is restarted in the middle of the strobe by a signal from the intermediate output of the driver 4, which in this case forms a full strobe of duration i. After a time t from the moment of restarting element 3, shaper 4 begins to form a second gate, which receives a false sequence pulse. To simplify consideration, we assume that its arrival time coincides with the middle of the strobe. In this case, the start-up element of the delay 3 occurs by a signal from the output of the element OR 2, which simultaneously receives signals from the output bus 10 of Fig. (2e) and the intermediate output of the driver 4. At the same time, the signal from the output bus 10 also goes to the input reset shaper 4, dropping it and thereby break strobe. Thus, in this example, the pulses of the false sequence fall into each second drop. In the case of an input pulse in the first half of the strobe, it passes through the open element AND 5 to the output, resets the driver 4 1 through the element OR 2 starts the element (delay 3, which again counts the time t, starts the driver 4, etc. In this case, the signal at the intermediate output of the driver 4 is not generated. If the input pulse enters the second half of the strobe, the delay element 3 is first triggered by the signal from the middle of the strobe, coming from the intermediate output of the driver 4 through the OR 2 element, and then again A selectable Elm pulse is transmitted through element 5 on the output bus 10. The same pulse resets the driver 4. Thus, the middle of the next gate coincides with the expected arrival time of the next pulse for which the selector is tuned. shaper 4 to the input of the conversion device b, the conversion factor of which is equal to the given number p. In this example. The scaler 6 changes its state in accordance with the gate pulse decay. Each output pulse from the output bus 10 is fed to the input of the counting device 8, the conversion factor of which is equal to the specified number W, and t, p. In this example, selected. The scaler 8 changes its state along the front of the output pulse. Before entering the input device W, selectable pulses at its output are maintained at a high level, allowing the signal to pass through the AND 7 element from the output of the calculating device 6. When a calculating device arrives at the input W and more pulses, a low level is set at its output, the closing element AND 7, Since by the time of the end of the fourth strobe, two pulses from the output bus, i.e. less than, the signal that is formed at the output of the counting device b after the arrival of a specified number of gates passes through the open element 7 and (Fig. 2) and resets the device 1 and the delay 3, thus preparing the selector. to launch. The pulse decay from the output of the counting device b also causes the reset of the counting device 8. Due to the fact that the pulse repetition period of the false sequence T is longer than the repetition period of the useful signal Tc, there will always be at least one pulse of the specified sequence in the absence of impulses). Therefore, the first input impulse following the last impulse of the false sequence, after which the selection reset occurred, will pulse sequence. This pulse is transmitted by the device 1. And through the element OR 2 starts the element of delay 3, starting the pulse selector on a period; 1y repetition. Consequently, there was a reset of the selection of a FALSE pulse sequence with a repetition period of 1, a multiple of the specified one, and a sequence capture with a given repetition period. In the event that the number of selectable pulses arriving at the input of the counting device 8 is equal to or greater than m, then the output of the counting device 8 is set to a low level and the signal from the output of the counting device b passes through the And 7 element. Only the scaling device B is reset, which is thus prepared for the next work cycle. Here it is considered that the selector selects a given sequence. Thus, in the proposed device, the selection is reset in the event that

gates also get less than “n pulses, i.e. presence (criterion for the detection of a useful signal over a given observation interval To, which

the sum of the TI repetition periods Tj. is the accumulation of a given number of m pulses in the gates in the interval TO IfT.

Claims (1)

PULSE SELECTOR BY REPEAT PERIOD, containing the first recounting device and the first pulse extraction device connected in series, the OR element, delay element, strobe generator and the first AND element, the second input of which is connected to the input bus and the input of the first pulse extraction device, the output is to the output bus , the reset input of the gate generator and the second input of the OR element, the third input of which is connected to the intermediate output of the gate generator, the output of which is connected to the counting input of the first of the calculating device, wherein the reset inputs of the extraction device ‘of the first pulse and the delay element are combined, characterized in that, in order to increase the reliability of selection when selecting a given sequence of pulses among periodic signals c. in multiple repetition periods, the second element And the second conversion device is inserted into it, the counting input of which is connected to the output bus, the reset input is to the output of the first conversion device and the first input of the second element And, the second input of which is connected to the output of the second conversion device, and the output is with the reset input of the delay element. from 5S (L s