METHOD FOR EPHEMERAL CONTROL OF SPACECRAFT GLOBAL NAVIGATION SATELLITE SYSTEM Russian patent published in 2010 - IPC G01C21/24 

FIELD: physics.

SUBSTANCE: low-orbiting spacecraft fitted with apparatus for synchronising onboard time scale with system time scale, apparatus for determining orbit parametres from terrestrial television signals and onboard apparatus for inter-satellite measurements is taken to an orbit. During orbital flight of the spacecraft, its onboard time scale is synchronised with the system time scale of the global navigation satellite system. Orbit parametres of the spacecraft are determined from television signals. A navigation message containing orbit parametres of the spacecraft is sent. Inter-satellite measurements are taken, during which motion parametres of the spacecraft navigation system relative the low-orbiting spacecraft are measured. Inter-satellite measurements and orbit parametres of the low-orbiting spacecraft in onboard control systems of the spacecraft navigation system are used to determine orbit parametres and ephemerides.

EFFECT: higher measurement accuracy.

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