Exploring new pastures
Every stretch of water (enclosed seas, lakes, rivers, flooding areas...) or even flat surfaces over lands can give valid data - as long as the satellite fly over them. Credits: Aviso
For Jason-1 or Topex/Poseidon, areas where radiometer measurements are typically edited out (ie disregarded) by standard processing (in red) and ones where they are retained (in green). The Aegean Sea, in particular, is completely overlooked. Credits: Aviso
Jason-2 will achieve this advance through 2 instruments working in tandem: the DORIS precise-positioning system and the Poseidon-3 altimeter. DORIS tells Poseidon-3 what the satellite’s altitude is, while Poseidon-3 records terrain elevation. With this information, the position of the return signal can be calculated and the altimeter will no longer need to locate it. The signal will therefore be recorded continuously, even along coasts and over continental water bodies.
The T2L2** instrument is designed with fundamental physics in mind. As a technology passenger on Jason-2, it will synchronize clocks using a laser signal time-tagged by a ground clock and another clock on the satellite.
|Launch campaign latest.|
|Preparations for the launch scheduled 15 June are going according to plan. 19 May, the satellite’s fuel tanks were filled with hydrazine and pressurized. The adaptor mating the satellite to the launcher and protecting it from vibrations during launch is set to be mounted on 27 May. The satellite is expected to roll out to the launch pad on 2 June.|
* Light Particle Telescope
** Time Transfer by Laser Link
TOPEX/POSEIDON, the beginnings of satellite oceanography
How altimetry works