METHOD OF CLOCK SYNCHRONIZATION Russian patent published in 2007 - IPC G04C11/02 G04G7/00 

FIELD: communication engineering.

SUBSTANCE: method can be used in radio interferometry, when super long bases are used, as well as in universal time and frequency service. Clock synchronization is based upon simultaneous reception of noise-like microwave signals from board of artificial Earth's satellite; on-ground points, set apart from each other, receive signals. Received signals are coherent transformed to video frequency. Received signals are registered digitally and time delay in arrival of the same signal to synchronization points is determined by means of registered signals correlation processing method. Meaning of correlation processing is used to compare time scales. At initial moment of time t₁, the noise microwave signal is formed by means of code sequence. Then signal is registered at the same point. Formed signal if transformed by ω₁, power amplified and amplified signal is radiated at the direction of artificial satellite-retranslator of Earth. At the same time moment t₁, according to clock from second point like noise microwave signal is formed by means of the same code sequence. The signal is registered at second point. On-board equipment of Earth artificial satellite receives signal at ω¹ frequency to keep phase relations. A the same time, signal at frequency ω₂ is received and transformed in frequency by using voltage of second heterodyne, being +°90 phase shifted. Then voltage of second intermediate frequency is extracted and shifted in -90° in phase. Then it is summed with total voltage of second intermediate frequency. Received total voltage is multiplied by signal to be received. Harmonic voltage is extracted at frequency of w_h2 of second heterodyne. Then voltage is detected and used for permission of subsequent processing of signal to be received.

EFFECT: improved noise immunity; improved precision of synchronization due to suppression of false signals (noises).

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