SU439935A1 - Clock Synchronization Device for Noise-Like Signals - Google Patents

Description

The invention relates to the field of radio communications, and in particular, to communication systems where synchronization is necessary, and can be used to synchronize data transmission systems.

A device for clock synchronization of noise-like signals is known, which contains multipliers of the receive and reference signals, connected by their outputs through an adder to a filtering circuit controlled by a generator and a pseudo-random sequence generator (PSP). The disadvantage of the known device is the difficulty of ensuring the identity of the channels of the discriminator, in the absence of which the synchronization accuracy deteriorates.

In order to increase reliability while maintaining a short synchronization time and accuracy of synchronization, the output of the receiver of the received high-frequency signal to the PSP video signal is connected to the clock input of the PSP generator through the parallel-connected inputs of three narrowband filters configured accordingly: the first is for the carrier frequency, the second is for the carrier plus the clock frequency, the third for the carrier minus the clock frequency; an adder, an amplitude detector, a fourth narrow-band filter tuned to a clock frequency, and a controlled clock-controlled phase-locked loop

generator, and the output of the PSP generator is connected to the second input of the multiplier of the received high-frequency signal to the PSP video signal, and the output of the first narrowband filter tuned to the carrier frequency is connected to the first input of the adder, the output of the second narrowband filter tuned to the carrier plus clock frequency is connected to the second adder input

and the output of the third narrowband filter tuned to the carrier minus the clock frequency is connected to the third input of the adder.

The drawing shows a functional diagram of the proposed device.

The device for clock synchronization of noise-like signals contains multiplier 1, narrow-band filters 2, 3, 4, whose outputs through adder 5, amplitude degenerator 6, fourth narrow-band filter 7 are connected to the input of the phase auto-tuning 8, the output of the controlled generator of which is connected to the clock input of the SRP generator 9.

In synchronism mode, when the SRP of the received high-frequency phase-shifted noise-like signal is shifted in time relative to the SRP of the reference signal by half the length of the SRP element, the signal spectrum at the output of the subamplifier 1 contains three main components with frequencies equal to the carrier frequency, carrier plus

clock and carrier minus clock. The signals of these frequencies are filtered by narrowband filters 2, 3, 4, summed in adder 5. The signal at the output of adder 5 is an amplitude-modulated oscillation with a modulation depth of about 100%. The amplitude detector 6 selects the envelope of this oscillation — a clock frequency signal which, after filtering in filter 7, is fed to the input of the phase locked loop system 8, which maintains the synchronization mode.

The clock signal of the controlled oscillator of the phase-locked loop system 8 is fed to the clock bus of the POP generator 9, from the output of one of the stages of which the video signal PSP is fed to the second input of the multiplier 1.

Subject invention

A clock synchronization device for noise-like signals containing a multiplier of a received high-frequency signal to a pseudo-random sequence video signal connected by its first input to the device input, a filter circuit, a controlled clock generator and a pseudo-random sequence generator, characterized in that, in order to increase reliability while maintaining a short input time in synchronism and accuracy of synchronization, the output of the multiplier of the received high-frequency signal "a video signal pseudo The irradiated sequence is connected to the clock input of the pseudo-random sequence generator through parallel-connected inputs of three narrowband filters configured accordingly: the first to the carrier frequency, the second to the carrier plus the clock frequency, the third to the carrier minus the clock frequency, adder, amplitude detector, the fourth narrowband filter tuned to the clock frequency, and the phase-locked loop of the controlled clock generator, and the output of the pseudo-random sequence generator under Connected to the second input of the multiplier of the received high-frequency signal to the video signal of a pseudo-random sequence, and the output of the first narrowband filter tuned to the carrier frequency is connected to the first input of the adder, the output of the second narrowband filter tuned to the carrier plus clock frequency is connected to the second input of the adder, and the output The third narrowband filter tuned to the carrier minus the clock frequency is connected to the third input of the adder.