Process and device for determining the transit time between a spacecraft and a ground station.

摘要

Process and device for determining the transit time between a spacecraft and a ground station.The invention relates to a process and a device for determining the transit time sym t of signals between a ground station equipped with a system ground (3),And a spacecraft equipped with a system board (14).There is in the system ground (3) and is issued to the spaceship a frame synchronization TC dist which comprises at least one bit synchronization; is measured and set at the train station the ground range hasPo soil sym tsolo between the moment of issue of bit synchronization and the instant of reception of a reference bit of a plot of telemedida which records the number of NTS.It generates and emits to the spacecraft on a plot of measured Tc - MES, which incorporates sym tsolo and nts.It is measured on board the spaceship the interval sym tbordo between receipt of the bit synchronization and the issue of the reference bit of a plot of tele - measure the number of weft NTB is recordADO, calculate the transit time sym t by the following formula: 2 sym t = tsolo sym sym + (NTB - NTS) x D plot - medium (soil), middle (board), noise (solo) - noise (board).