France has recently embarked on a permanent space surveillance capability in a newly-opened facility near Lyons; manned 24/7 by air force crews, it will deploy the Systeme d'Information Spatiale, a space situational awareness C2 granted to a consortium led by Thales Alenia Space end-2014; the SIS will leverage expert tracking of space weather, as well as the modernised Graves bistatic radar mapping objects in low orbit, designating some to dedicated orbitography
radars or optical telescopes.
This also includes orbitography
services and precise location of these missions.
CNES will provide the SWOT spacecraft bus, the KaRIn instrument's Radio Frequency Unit (RFU), the dual frequency Ku/C-band Nadir Altimeter, the Doppler Orbitography
and Radiopositioning Integrated by Satellite (DORIS) receiver package, satellite command and control, and data processing infrastructure.
and Radio-positioning Integrated by Satellite (DORIS) on board enables precise determination of the orbit.
DORIS (Doppler Orbitography
and Radiopositioning Integrated by Satellite:) Doppler tracking antenna receives ground signals for precise orbit determination, satellite tracking, and ionospheric correction data for the altimeter
Another way to measure distances to satellites is with DORIS (Doppler Orbitography
and Radiopositioning Integrated by Satellite), which was built and is operated by the French space agency, known as CNES.
They will also provide several of the science instruments, including a Poseidon-3 dual-frequency radar altimeter and the Doppler Orbitography
and Radiopositioning Integrated by Satellite orbit-determination system.