SU1462240A1 - Device for automatic tracking of pulse - Google Patents

Abstract

This invention relates to pulse-CHbfri follow-up systems. The aim of the invention is to expand the field of application by accurately tracking the impulse followed. The device comprises a pulse generator 1, an adjustable delay line 2, a delay line 3, an AND 4 element, a trigger 5, a low-pass filter 6, a pulse selector 7, and an input pulse sensor 8. The essence of the invention is not to ensure the dynamic equilibrium of the leading front of the tracking pulse relative to the falling front of the selected pulse. In this way, a tracking pulse is applied to a pulse that changes its position in the packet. At the same time, the fronts of the impulse taken from the packet remain stable, which facilitates its possibility of further use. 2 Il. (L

Description

Fig. /

The invention relates to a pulse technique, in particular to automatic tracking systems, and can be used in various measuring systems for automatic tracking of a pulse.

The purpose of the invention is to expand the field of application of the device by accurately distinguishing the followed pulse.

 FIG. 1 shows a block diagram of a device for automatic tracking of a pulse; in fig. 2 - time diagrams of his work.

The device contains a pulse generator 1, an adjustable 2 delay line, a delay line 3, an AND 4 element, a trigger 5, a low-pass filter 6, an impulse selector 7, and an input pulse sensor 8 (and, - is the output signal i-ro). ka system).

The low-pass filter 6 can be made as an aperiodic link selector 7 followed by a pulse on the digital element 2I.

The device works as follows.

A pulse packet U is fed to the information input of the selector of the followed pulse, which due to some reason changes its position and from which it is necessary to select one pulse. The selection pulse generator 1 generates a pulse, and with the help of an adjustable delay line 2 it is delayed until it coincides with a randomly selected pulse from the Ug packet, which is followed later. The pulse duration of the selection 1 is chosen to be longer than the pulse emitted from the Ug packet and if pulses in the Ug packet follow periodically, then

1.5T TC 0.5T,

where T is the pulse duration of the selection

T - the period of the pulse

in the Ug package.

The delay of the selection pulse U is chosen such that the selection pulse and overlap in time the pulse taken from the Ug packet. The selection pulse Uji thus delayed is fed to the control input of the selector 7, followed by a pulse, the output of which has a pulse U isolated from the packet. To implement the automatic tracking of this pulse Uy, the selection pulse Uj is delayed by a constant line 3 delays so that its front edge coincides with trailing edge of the selected pulse and. Let us denote this impulse of tracking .U and give it to the first input of the And 4 element, to the second input of which an isolated pulse U is fed.

Consider the case when, due to some reason, the burst of pulses Ug, and consequently, the selected pulse, moved to the right from its initial position. In this case, the pulse U coincides with the pulse Uj and at the output of the element AND 4po is the coincidence pulse U4, which is applied to the second input of the trigger 5. With this pulse, the trigger 5 is set to a position with a high potential at the output Vf, B the initial state trigger 5 is set by the initial selection pulse U, which increases the power of the error signal. The low-pass filter 6 extracts a constant component U from this signal, which is a control signal. This signal is fed to the control input of the adjustable delay line 2. In this case, the delay of the selection pulse will increase and it will start moving to the right, respectively, the tracking impulse and will also move to the right. This movement continues until the next impulse comes out of coincidence with the amplified pulse and. At the same time img disappears. the pulse U4 at the output of the element 4, the high potential disappears at the output of the trigger 5, and at the output of the low-frequency filter 6 the control signal U begins to decrease. The adjustable delay line 2 reduces the delay of the selection pulse U and the tracking pulse u. The latter coincides with a separate pulse and, and the whole cycle repeats. The dynamic equilibrium of the leading edge of the tracking pulse and from the relative falling edge of the highlighted pulse U occurs. Thus, the tracking pulse Uj is tied to the changing

3,146

its position impulse in the package Ug. In this case, the fronts of the pulse Uj taken from the packet remain stable,;, which implies its further use. This provides expanded. The application area of the proposed device is compared with the known. When fulfilling the conditions

four

,

where is t

- the rise time of the pulse front of the puppies U ,;

- - - - y.

T is the duration of the impulse of the driving drive and ,;

duration allotted

Dashul U, which is easily ensured in practice, the accuracy of coincidence of the divided pulse with the distant from the Uj packet, unlike the known device, does not depend on the steepness of the edges of the tracking pulse 11, and is determined only by the delay time of the impulse in the selector 7. pulse relative to the same pulse in the package Up.

Claims (1)

Invention Formula A device for automatic tracking of a pulse, comprising a pulse generator, the output of which is connected to the first input of a trigger, the output of which is connected to a low-pass filter, an element AND whose output is connected to a second input of a trigger, characterized in that, in order to disseminate the application area due to exact selection of the accompanying pulse, an adjustable delay line, a delay line, a pulse followed by a selector and an input pulse sensor, the output of which is connected to the information input of the sop selector pulsed pulse whose output is the output of the device and is connected to the first input of the element I, the lowpass filter output is connected to the control input of the adjustable delay line, whose information input is combined with the first trigger input, the output of the adjustable delay line is connected to control input followed by a pulse and through a delay line connected to the second input element I.