SU490263A1 - Zero beat discriminator - Google Patents

Description

one

The invention relates to a pulse technique.

A zero-beat discriminator is known, consisting of two processing units of orthoial signals consisting of a phase detector, a low-pass filter, a key, a zero-order memory block, a differentiating circuit, a phase inverter, and a selection pulse former, the adder, whose inputs are blocks processing orthogonal signals, and a low-pass filter connected to the output of the adder.

The known zero beat discriminator does not have the ability to eliminate the dependence of the output signal level on the duty cycle of the input pulses.

The aim of the invention is to reduce the dependence of the output signal level on the duty cycle of the input pulses.

In the phase discriminator described, this goal is achieved by introducing two pulse duration extension units, one of which contains two coincidence circuits, two keys, a memory block and a delay line, and the second contains two coincidence circuits, two keys and a memory unit, wherein the inputs of the coincidence circuits are connected to the outputs of the selectoring pulse formers of the respective processing units

the orthogonal signals, and the outputs of the blocks of the us of both blocks of the extension of the pulse duration are connected to the inputs of the said adder.

The block diagram of the described discriminator is shown in the drawing.

The discriminator described above contains blocks 1, 2 of processing of orthogonal signals consisting of phase detectors 3, 4, low-pass filters 5, 6, keys 7, 8, blocks 9, 10 of zero order memory, differentiating circuits 11, 12, phase inverters 13 , 14 and the formers 15, 16 of the selection nmnuls, the adder 17, the low-pass filter 18 and the stretch duration blocks 19, 20 of the pulses consisting respectively of the matching schemes 21-24, the keys 25-28, the blocks 29, 30 and these lines, 31 delays, the input 32 of the discriminator, to which the selection pulse is fed, the input 33, on which the coherent pulse signal is fed, inputs 34, 35, to which the orthogonal reference signals are applied, the discriminator output 36.

The discriminator works as follows.

When charging to the input of phase detectors 3 and 4 of a coherent-emulsion signal / s with carrier frequency fc and reference oscillations with fan frequency, shifted relative to each other by 90 °, at the output of filters 5, 6 lower ch