SU984024A2 - Device for discriminating first pulse from pulse train - Google Patents

Description

The invention relates to a pulse technique and is intended to isolate a first pulse from a series of radio pulses,

According to the main author. St. 572911 a device is known for isolating a first pulse from a series that contains) -K trigger. And an element whose first input is combined with a counting trigger input, the second input is combined with the IK trigger inputs and connected to the inverse trigger output and allows the first pulse to be extracted from non-pulse pulse sequence il.

However, using this device, it is impossible to isolate the first pulse from a series of radio pulses having a variable duration and a variable (random) follow-up period 1.

The purpose of the invention is to expand the functionality by separating the first pulse from a series of pulses having variable duration and following period.

The goal is achieved by the fact that a device for separating the first pulse from the series, containing an I-K trigger and an AND element, the first

the input of which is combined with the counting trigger input and connected to the device input, and the second input is combined with the trigger I-K inputs and connected to the inverse output of the trigger, the reference frequency generator is entered; the second element And, the first input of which is connected to the output of the reference frequency generator, the counter and divider, the counting inputs of which are connected to the output of the second element And, the installation input of the counter is combined with the recording input of the divider and connected to the input of the device, the outputs of the counter are connected to the installation inputs of the divider, the output of which is connected to the installation input of the zero trigger, and the direct output of the trigger is connected to the second input of the second element I. The proposed device allows you to select not only the first pulse of a continuous pulse th sequence, but also the first pulse of each packet radioimpulsyv imeposchy variable duration and repetition period that is obtained by comparing the period of the carrier burst and intervalamezhdu bundles and forming trigger pulse setting zero in the interval between bursts

radio pulses, which is greater than the period of the carrier pulses of the packet.

The drawing shows a block diagram of a device for separating a first pulse from a series.

A device for separating the first pulse from the series contains IK trigger 1, element 2, generator 3 of the reference frequency, element 4, counter 5 divider 6. The device input is connected to the counting input of trigger 1, to the installation input of counter 5, to the recording input of bis divider the first input element And 2, the second input of which is combined with the IK inputs of the trigger. 1 and connected to the inverse output of the trigger 1. The first input of the And 4 element is connected to the output of the reference frequency generator 3, the second input is connected to the output of the trigger 1, and the output of the And 4 element is connected to the counting inputs of the counter 5 and divider b. The outputs of the counter 5 are connected to the installation inputs of the divider b, the output of which is connected to the input of the installation zero of the trigger 1.

A device for separating the first pulse from the series operates as follows.

At the initial moment, the installation of the trigger 1, the counter 5 and the divider b is in the zero state (the installation circuits are not shown in the diagram), and a single potential is fed to the I-K inputs of the trigger 1.

With the arrival of a sequence of radio pulses, the first impulse of the bundle passes to the output of the element 2. With the falling edge of this pulse, trigger 1 is transferred to the unit state, and at the IK inputs of trigger 1 from the output (5, zero potential is applied. Trigger 1 is blocked and does not respond to the remaining pulses of the first packet that are not passed to the output of the element AND 2. In addition, the leading edge of the first pulse to the inputs of the divider 6 is the zero code from the outputs of counter 5, and the same front, somewhat delayed, is set to ik 5 to the state corresponding to the code of a certain number (for example, or 2), after trigger 1 is set to one state, the second input of the element .and 4 has a single potential, and counting inputs of counter 5 are applied to the counting inputs of divider b the output of the generator 3, while the divider b on the interval between the first and second input pulses of the stack does not count the reference pulses, since the zero code that specifies the division factor of the given divider is written on its installation inputs. With the arrival of the second pulse of the first packet of radio pulses, the falling edge

the second pulse to the installation inputs of the divider b is written down the code of the number of pulses of the reference frequency from the outputs of the counter 5, calculated on the interval between the first and second input pulses, taking into account some addition due to the initial installation of the counter 5 by the falling edge of the first pulse. The falling edge (somewhat delayed) of the second pulse is made by setting the counter 5 to its initial state.

In the interval between the second and third and the successive s and pulses of the first packet, the divider b counts the reference pulses, while it does not overflow and no pulse is generated at its output, since the number of reference pulses received at its input at a given interval is less (1 or 2) the number recorded at its inputs and setting the division factor.

After the last pulse of the first pack, reference pulses arrive at the input of the divider, the number of which is larger than the number recorded at the installation inputs, and at the output of the divider b, 1 pulse is generated, which resets trigger 1 to the zero state. In this case, a single potential is applied to the I-K inputs, and the arrival of the reference pulses through the And 4 cell is terminated.

With the arrival of the second and subsequent bursts of radio pulses, a similar selection of the first impulse of the pack and the formation of a pulse at the output of the divider b are made in the pauses between the packs to set trigger 1 to the zero state. In this case, the falling edge of the first pulse of the second and subsequent bursts on the installation inputs of the divider b is written down the code of the number of pulses of the reference frequency, counted by counter 5 in the interval between the last pulse of the previous batch and the moment of overflow of the divider b and the formation of the output pulse of the divider b.

Thus, introducing into a known device for separating the first pulse from a series of a frequency-level generator, element I, a counter and a divider allows to expand its functionality, namely, to separate the first pulses not only from a continuous sequence, but also from a series of radio pulses having an unknown variable interval, which favorably distinguishes it from the base object, in which quality the proposed device is taken,.

Claims (1)

1. USSR author's certificate J 572911, cl. H 03 K 5/22, -1974.