SU989748A1 - Pulse duration discriminator - Google Patents

Description

(54) SELECTOR OF PULSES OF DURATION

one

The invention relates to a pulse technique and is intended to highlight useful signals of a predetermined duration and suppress interference that is different from those of a specific duration.

A device is known that consists of two delay lines connected to the input bus, one of which is misaligned at the output, and the output signal is matched and the input of the matched delay line is connected to the inputs of the controlled prohibition element Ell.

The disadvantage of this device is that it does not provide for the selection of different polarity pulses. In addition, it uses two delay lines, which makes it difficult to change the selection range, since the delay time of the lines must change simultaneously and by the same amount.

Closest to the proposed technical entity is a device that contains a delay line,

lacquered and matched at the output, the input of which is connected to the input bus and the input of the first video amplifier, the output of which through the first detector is connected to the first input of cyMMarojSa, the second input of which is connected to the output of the delay line t 2 through the second detector,

The disadvantage of this device lies in its limited functional capabilities, which consist in the impossibility of selecting pulses of different polarity for further processing of these pulses separately.

15

The purpose of the invention is to expand the functionality of the device.

The goal is achieved by the fact that the device containing the first adder and matched at the input and the Bwixflfe line of the rear B1: mat, whose input is connected to the input bus of the device and the input of the first video amplifier, and the output with the input of the second video amplifier, are entered , the inverter and the first and second elements coincide, the outputs of which are connected respectively to the first and second output buses of the device, and the first and second inputs. - with the outputs of the second and third adders, respectively, the first inputs which are connected to the output of the delay line, the first one being directly and the second through an inverter, and the second inputs of the adders are connected to the output of the first adder, the first and second inputs of which are connected to the outputs of the first and second video amplifiers, respectively. In addition, in order to improve the reliability of selection, a mixer and a third video amplifier can be entered into the device, the input of which is connected to the output of the delay line, and the output is connected to the first input of the mixer, the second and third inputs of which are connected to the outputs of the first and second matches, respectively and the output is connected to the third output bus of the device. . FIG. 1 shows the structural scheme of the pulse selector by duration; FIG. 2 - time diagrams that show his work. The device contains the first and second in 1 amplifiers 1 and 2, the delay line 3, the input of which is connected to the input bus, the adders 4, 5 and 6, the inverter 7 elements 8 and 9 match, the outputs of which are connected respectively to the first and second output buses, the third form the amplifier 10 and the mixer 11, the output of which is connected to the third output bus. The device works as follows. Input signal 12, containing useful pulses 13–16 of positive polarity, useful pulses 17 and 18 (pulse 16 and 18 against the background of extended interference 19) of negative polarity with residue levels 20 and 21, respectively, are fed to the inputs of video amplifier 1 and delay lines 3. All pulses can vary in the dynamic range 22. After passing through the delay line 3, the input signal 12 at the input of the adder 5. takes the form of a signal 23 and passes through the inverter 7, at the input of the adder 6 has the form of a signal 24. Simultaneously input signal 12 after passing through delay line 3 and through video amplifiers 1 and 2, as a result of mutual subtraction in adder 4, it takes the form of signal 25, which is fed to the second inputs of adders 5 and 6. Signals 23 and 25 are fed to the input of Biv adder as a result of algebraic addition at the output, they take the form of signal 26. Signals 24 and 25 are fed to the input of the adder, b the result of algebraic addition at its output takes the form of a signal 27. The received signals 26 and 27 are fed to the inputs of element 8, which is triggered only by time-dependent positive impulses second polarity 28, LP, 32, 34 and 29, 31, 33, 35, respectively, the image signal 36 comprised of pulses 37 - 4O corresponding to the input pulse of positive polarity 13 - 16, respectively. Thus, an extended pulse of interference 19 of positive polarity at the output of element 8 and on the first output bus does not pass. At the same time, the received signals 26 and 27 arrive at the inputs of element 9, which is triggered only by matched pulses of negative polarity 41 - 44, respectively, forming a signal 45 consisting of pulses 46 and 47 corresponding to negative polarity input pulses 17 ( with the remainder of 2O) and 18 ic with the remainder of 21). In this way, the functionality of the device is expanded, i.e. the allocation of different polarity pulses with preservation of their original polarity. To increase the reliability of the selection, for example, to improve image clarity, the received signals 36 and 45 are fed to a mixer 11, the input signal 12 that passes through delay line 3 and the video amplifier 10 enters the same mixer. As a result of mixing the output signals the mixer 11 and on the third output bus of the device, we obtain a signal 48 with an increased amplitude of useful signals of positive polarity 49 ± 52 and a reduced balance for signals of negative polarity 53 and 54.

The amplitude of the interference 19 is not output from the device (level 55) does not change. This indicates a clear increase in usefulness for sigals.

By changing the transmission coefficient of the delayed signals 12 over the entire dynamic range 22, it is possible to noi (at the output of the mixer 11 for signals 48, the level 55 for the interference 19 is y that it will not interfere, and the useful signals 49-54 will be reliably displayed. And the need, for example, in the indicator of the general noise situation is eliminated, since the divided information is divided into n (the useful signals and the interfering ones are then combined again, but already with the possibility of setting the level 55 required for reliable selection. s but correction definition of fine details, for example, radar image that simultaneously indicates an improvement of the use vshelennyh Hetero {Shikh signals.

In addition, the jiaHHoe device does not degrade the resolution, since the adjacent input pulses 14 and 15 with the remainder 20 are separated separately in the form of pulses 50 and 51 with a practically zero level of the remainder 53 (in the prototype the pulses 5O, 51, 53 merge into a single one, which worsens the resolution).

Claims (2)

1. Pulse selector by duration, containing the first adder and matched at the input and the delayed output signal that is matched at the output, the input of which connected to the input bus of the device and the input of the first video amplifier, and the output from the second input to the amplifier, characterized in that, in order to expand the functional capabilities, the second and third adders, the inverter and the second coincidence elements, whose outputs are connected respectively, are entered into it. with the first and second output buses of the device, and the first and second - with the outputs of the second p of the third adders, the first input of the second adder is connected directly, and the first input of the third adder is via an inverter House delay line and the second inputs of the adders are connected to vyhods l Perret Matora sum, the first and second inputs with the outputs kotorogosoedineny sootvets-gaezvsho first and second videousshgatepey. 2. The selector of claim 1 is distinguished by the fact that, with asftbso of higher reliability of selection, a mixer and a third video amplifier, the input of which is connected to the output of the delay line, and the output connected to the first input of the mixer, are entered into it, the second and the third the inputs of which are connected to the outputs of the first and second elements of the match, respectively, and the output is connected to the third output bus of the device. Sources of information taken into account in the examination 1.Timakhov O.N. and Lyubchenko V.K. Selectors w pulses. M., Soviet Radio, 1966, p. 234. 2. USSR author's certificate №470916, cl. H 03 K 5/18, O3.04.73 (prototype). GT GT at // t ten 1  . / Y five ml