Editing Satellite navigation (section)

===DORIS===
{{Main|DORIS (satellite system)}}
Doppler Orbitography and Radio-positioning Integrated by Satellite (DORIS) is a French precision navigation system. Unlike other GNSS systems, it is based on static emitting stations around the world, the receivers being on satellites, in order to precisely determine their orbital position. The system may be used also for mobile receivers on land with more limited usage and coverage. Used with traditional GNSS systems, it pushes the accuracy of positions to centimetric precision (and to millimetric precision for altimetric application and also allows monitoring very tiny seasonal changes of Earth rotation and deformations), in order to build a much more precise geodesic reference system.<ref>{{cite web|url=http://www.aviso.altimetry.fr/en/doris.html |title=DORIS information page |publisher=Jason.oceanobs.com |access-date=2011-12-30}}</ref>