CLOCK SYNCHRONISATION SYSTEM Russian patent published in 2010 - IPC G04C11/02 

FIELD: physics.

SUBSTANCE: invention can be used in radio interferometry with very long bases, in universal time and frequency service, as well as for exchanging confidential discrete and analogue information between ground stations which are far apart using a geostationary artificial earth satellite transponder and protection of the said information from unauthorised access. The clock synchronisation system has an artificial earth satellite transponder, first and second ground stations, each of which has a time and frequency standard, first and second heterodynes, a transceiving antenna, a duplexer, a first power amplifier, a first mixer, a first intermediate frequency amplifier, a first clipper, a first memory unit, a correlator, a pseudonoise generator, a switch, a second mixer, a second intermediate frequency amplifier, a second power amplifier, a second clipper, a second memory unit, a selector, first and second amplitude limiters, first, second and third synchronous detectors, an analogue descrambler, a multiplier, band-pass filter, first, second and third phase detectors, a digital descrambler, first and second +30° phase changers, first and second -30° phase changers, first, second, third and fourth subtracting units, first and second +90° phase changers. The pseudonoise generator has a high-frequency driving oscillator, a discrete message source, a digital scrambler, a phase manipulator, an analogue message source, an analogue scrambler, an amplitude modulator and a band-pass amplifier. The selector has a phase doubler, first and second spectral width measuring devices, a comparator unit, a threshold unit and a switch. The analogue scrambler, which uses a frequency inversion technique, has a clock generator, a divider - shaper, a band-pass filter, a balanced modulator, an analogue switch, an adder and a low-pass filter.

EFFECT: increased noise-immunity and reliability of exchanging confidential information between ground stations through suppression of narrow-band interference.

10 dwg