SU515299A2 - Autoselector periodic pulse train - Google Patents

Description

(54) AUTO SELECTOR OF PERIODIC SEQUENCE OF PULSES

The latter is also connected to the input of the delay element Tees by the output of the auto selector.

The autoselector works as follows,

At the initial moment of operation, narrowband analyzer 2, which is a high-Q resonant system, is in the unexcited state, the control signal to the gate cascade 1 is not supplied, and it passes all the signal and interference from the input of the auto-selector to its output, which directly affects: to narrowband analyzer 2.

Narrowband analyzer 2, when excited, extracts from this mixture the alternating voltage of the first harmonic of the frequency of the bare pulses, which, through a matching stage 3 on the controlled comparator 4, is converted into a sequence of sync pulses. The sequence of clock pulses from the output of the comparator 4 is fed to the delay element 5, which establishes the phase relationship between the received pulse sequence and the sequence of clock pulses at the output of the comparator 4, necessary for normal operation of the auto-selector, and then goes to the gate driver 6, which converts the input clock sequence into a gate pulse sequence. to control the gating cascade 1, which goes into operation and starts OSCAL on analyzer entrance-mixture 2 received only in the time intervals and the expected Com || -ooleznogo signal.

 The presence of significant interference at 1 & during analyzer 2 at the beginning of its operation leads to the occurrence of the flyugug phase of the signal at its output and worsens the conditions for the auto-selector to synchronize. After synchronization, the effect of interference on the auto-selector is significantly weakened, since their main part does not fall into the input of the analyzer 2 due to the operation of the strobe stage 1.

For 6oj: ee, to determine the arrival time of the useful signal and, therefore, more accurately determine the open state of the gating cascade 1, a circuit is used for tracking and automatic phase adjustment, for which the signal from the output of the comparator 4 is fed through delay element 7 and the half-shaper 8 to a pulse-phase detector 9, the second input of which receives a signal from the input of the gating stage 1.

The pulse-phase detector 9 performs a comparison of the energy of the parts of the input pulses that fall on each of the half-strokes, and forms a control sigal proportional to the phase mismatch of the sequence of pulses fed to the input of the Auger-selector and the sequence of sync pulses generated by

control signal 1m comparator 4. This control signal acts on the second run of comparator 4 and changes the moment of fixation of the alternating phase transition from the output of the narrowband analyzer 2 through the level set by the control signal in the direction of decreasing the phase error of the compared sequences, which leads to an increase stability of the output clock phase,

reducing the time to synchronization and increase the noise immunity of the work of the auto-selector as a whole.

Claims (1)

Invention Formula ) Autoselector periodic sequence of pulses auth. St. No. 281531, characterized in that, in order to increase noise immunity, compare the stability of the output sync phase, pulse and reduce the synchronization time, between the output of the control unit, the comparator and the input of the gating cascade, the circuit is located for the last; automatic phase adjustment, consisting of a series-connected delay element, a half-cube shaper and a pulse-phase detector, whose output is connected to the second input controlled comparator.