SU790247A2 - Pulse selector - Google Patents

Description

(54) PULSE SELECTOR

one

The invention relates to radio engineering, in particular, to pulse selectors according to their period, and can be used to distinguish a periodic sequence of pulses against the background of chaotic interference, as well as to separate a set of series of pulse signals with different tracking frequencies.

According to the main author. St. No. 660221, a pulse selector is known comprising a delay element, a first strobe pulse generator, a first inhibit element and a first coincidence element connected in series between the pulse selector input and the first trigger input, the output of which through the first OR element, the delay unit and the second strobe generator the pulses are connected to the first input of the second coincidence element, the output of which is connected to the first inputs of the second and first OR elements, and the second input to the device input and the second input of the first coincidence element, in The output of which is connected to the second input of the second OR element, the output of which is the output of the device, while the outputs of the scaling unit are connected respectively to

The SECOND trigger input and the direct input of the second prohibition element, which prohibits the input and output of which are respectively connected to the inputs of the OR element of the delay unit, and the inputs of the counting unit are respectively connected to the input of the device and the output of the second strobe pulse generator, the input and output of which are respectively connected to the inputs of the third element OR, the output of which is connected to the prohibitory input of the first element of the ban ij ..

The disadvantage of the famous selector

15 pulses is the loss of information in the presence of interference before a selectable sequence that is a multiple of the pulse period of the selectable sequence. This is due to

20 that the duration of the disturbance period is a multiple of the delay in terms of time determined by the delay line and half the duration of the strobe pulse. In case of coincidence

25 with a strobe pulse, the interference pulse passes through the OR element to the output of the pulse selector, and also triggers the trigger. In the future, the pulse selector switches to self-oscillation mode. The number of self-oscillation cycles is determined by the value of the Recalculation Factor of the scaling scheme Pa Bp (hv; 4 .un OKoiieOaiiiin and its outgoing complete or partial loss of information.

The purpose of the invention is to improve the reliability of the device by reducing the loss of information in the presence of interference in front of a selectable sequence, multiples of the pulse period in the selectable sequence.

The goal is achieved by the fact that the pulse selector containing the delay element / the first stroBo-pulse generator, the first inhibit element and the first match element Bi Jiro4eHHhJX are sequentially between the pulse selector input and the first trigger input, the output of which is through the first OR element, the delay unit and the second generator the gate-pulse is connected to the first input of the second coincidence element, the output of which is connected to the first inputs of the first and second OR elements, and the second input to the device input and the second input of the first element This match, the output of which is connected to the second input of the second element OR, the output of which is the output of the device, while the outputs of the counting unit are connected respectively to the second input of the trigger and the forward input of the second prohibition element / prohibiting input and output of which are respectively connected to the inputs of the OR element the delay unit, and the inputs of the counting unit, respectively, are connected to the input of the device and the output of the second strobe pulse generator, the input and output of which are respectively connected to the inputs of the third element The OR input, the output of which is connected to the prohibitory input of the first prohibition element, is a series-connected additional delay element, a strobe pulse generator, and an element NOT connected between the device input and the additional third input, the second matching element.

FIG. 1 shows a structural electrical circuit of the device; in fig. 2 - voltage diagrams explaining the principle of operation of the device.

The pulse selector contains a block

1delay, which consists of a series-connected generator

2 semi-gages / element 3 OR and generator 4 delays, the output of which

through the generator 5 the strobe pulses are connected to the first input 6 of the match and one of the inputs of the element 7 of the counting one. The other input of the matching element b is connected to the input of the device and the other input of the counting element 7 / whose outputs are connected respectively to the direct input of the prohibition element 8 and

the second input of the trigger 9 / whose output is connected to the first input of the element 10 OR / whose second input is connected to the output of the matching element b and the first input of the element 11 OR, the output of which is the output of the device. The inputs of the element 12 OR are connected respectively to the input and output of the generator 5 strobe pulses / and the output with the prohibiting input of the element 13 prohibition, the output of which is connected to the first input element

14, the other input of which is connected to the input of the device and through the delay element 16 a strobe pulse generator 15 with a direct input of the prohibition element 13. The output of the coincidence element 14 is connected to the second input of the element 11 OR and the first input of trigger 9 / and the third input through the element 17 NOT / strobe-pulse generator 18

and delay element 19 19 to the input of the device. The prohibitory entry and exit of the prohibition element 8 are connected respectively to the inputs of the element 3 OR delay devices.

The pulse selector works as follows.

The input pulses pass through delay elements 16 and 19 and start up the generators 15 and 18, respectively. The delay time of the delay element 16 KHTjg g (Fig. 3 g) is set to / with half the duration of the generator strobe pulse

15on it was equal to the period of the following pulses of the selected sequence.

The delay time of delay element 19 {FIG. 3 m) is set such that, in sum, with half the duration of the strobe-pulse of the generator 18, it is equal to half the period of the following pulses of the selected sequence. The strobe pulses of the generator 15 through the element 1 is 3-apret / which has permission for the prohibitory entrance / enters the first input of the element 14 of the joint. To the second input of which comes an inverted strobe-pulse generator 18 / and to the third input - input pulses. When coinciding with the strobe pulse of the generator 15 and the positive potential of the element 17, the NOT input pulse passes through element 11 OR to the output of the device, and also triggers trigger 9 (FIG. B, u, n, n) / from which output through element 10 OR starts Generation 2 (Fig. 3 Sv), the pulse duration of which is equal to half the duration of the selection strobe pulses generated by the generator 5. Half-pulse pulses (Fig. Al) pass through the OR element 3 and the back front starts the generator 4 delays, from the output of which rectangular pulses (fig.Zg) served to generator input

5. The pulses from the output of the generator 4 and the generator 5 pass through the element

12OR on the entry ban

13 banned and shut it down. The pulses from the generator 5 and the pulses of the input signal are fed to the corresponding inputs of the coincidence element 6, which separates the pulses (Fig. Ze), from the input signal. Through the element 11 OR pulses are passed to the input of the device (Fig. 3N). -., gates are carried out only by the second pulse of the sequence (Fig. 3k). Subsequent starts are carried out by pulses of the output sequence of the device, which does not contain interference.

If there are gaps in the input signal in series, the generator 2 is not triggered, the prohibition from the prohibition element 8 is lifted, and on the prohibition element 13 there remains a gate-pulse generated from the impact of the useful signal preceding the skip pulse, is input to the element 7 and through the elements 8 and 3 starts generator 4 and then generator 5, from the output of which the pulses are again fed to the input of element 7, and so on.

If in the input sequence the number of missed pulses exceeds the recalculation factor of element 7, then the selector works out the number of gates, the prohibition of element 13 is lifted, the feedback circuit opens, until the first pulse after the input pulse passes, which resets element 7 to its initial state . The signal from the output of element 7 sets the trigger 9 to the initial state.

This selector pulses compared with the known has a higher noise immunity and reliability. In addition to the preservation of the electrical characteristics of the known device, namely; high reliability of selection in the presence of gaps, in a selectable sequence of pulses, the elimination of false triggering of the selector in the presence of interference within the selection sequence; reduction of information loss in the presence of chaotic interference before

o selectable sequence, the proposed selector also reduces information loss in the presence of interferences that are multiples of the pulse period of the selected sequence. The introduction of additional features makes it possible to increase the reliability of received information by 1.7–1, 10 times.

The outcome of the construction principle, this selector can be completely

0 is implemented on one system of elements, for example, a pulse-potential system of elements (transistor-transistor logic).

25

Claims (1)

Invention Formula Pulse selector, auth.St. No. 660221, characterized in that, in order to increase the operation reliability of the device, an additional delay element, a strobe pulse generator and a NOT element, connected between the device input and an additional input of the second element of the match. Sources of information taken into account in the examination 1. USSR author's certificate No. 660221, according to application No. 2413041 / 18-21 20.10,76. a ff b g J W l , f p and