ROVERA , Daniele

The Time Transfer by Laser Link (T2L2) experiment, developed by both CNES and OCA, performs ground to ground time transfer over intercontinental distances. The principle is derived from laser telemetry technology with dedicated space equipment designed to record arrival time of laser pulses at the satellite. Using laser pulses instead of radio...

In October 2012, the Ge?oazur TF laboratory in OCA has been reorganized to improve signal distribution stability. In particular we have implemented a new time scale TA(OCA) based on H-maser T4Science. The H-maser frequency is steered with an HROG-10 microphase stepper. The correction applied is computed every day taking into account the...

International audience

We present a direct comparison between two different techniques for the relative calibration of time transfer between remote time scales when using the signals transmitted by the Global Positioning System (GPS). In the remote sites, the local measurements are driving either the computation of the hardware delays of the local GPS equipment with...

Three independent time transfer techniques are in use in Observatoire de la Côte d'Azur (OCA): GPS, TWSTFT and T2L2. In Autumn 2013, a GPS receiver relative calibration campaign has been carried out. The result of this campaign, primary intended to compare GPS with T2L2, have allowed the calibration of the TWSTFT link between OCA and OP. We...

International audience

International audience

The Time Transfer by Laser Link (T2L2) experiment aims at achieving ground to ground time transfer between remote clocks using time tagging of laser pulses. The principle is derived from laser telemetry technology with a dedicated space equipment designed to record arrival epoch of laser pulses at the satellite. The use of laser pulses, instead...

This paper presents a direct comparison of two time transfer techniques on independently calibrated links: Time Transfer by Laser Link (T2L2) and Global Positioning System (GPS) satellite common-views (CV). The two different techniques are described, along with the independent link calibrations. The results achieved during one measurement...

The Time Transfer by Laser Link (T2L2) project is designed for the comparison of ground clocks utilizing a space instrument able to time tag laser pulses reaching the satellite and a SLR station network. Compared to the microwave techniques, such as the GPS-Common View, T2L2 should improve the time transfer uncertainty by at least one order of...

T2L2 (Time Transfer by Laser Link) permits the synchronization of remote ultra stable clocks over intercontinental distances. The principle is based upon laser telemetry technology with a network of laser stations on ground and dedicated space equipment designed to record arrival time of laser pulses at the satellite. T2L2 allows realization of...