At 6:42 November 14th, China has successfully launched the Ocean Salinity Detection Satellite using the Long March 4B carrier rocket at the Taiyuan Satellite Launch Center. This satellite is China's first remote sensing satellite dedicated to obtaining ocean salinity information, filling the gap in China's spaceborne ocean salinity detection technology and improving the marine satellite observation system. The ocean salinity detection satellite can meet the urgent needs of users in multiple industries such as ocean, agriculture and rural areas, disaster reduction and meteorology for the application of global ocean salinity data.  It has significant milestone significance.

The ocean salinity detection satellite adopts a new synthetic aperture microwave radiation measurement system. The main payload on the satellite is the synthetic aperture radiometer and the active and passive detector. The satellite synchronously acquires L-band radiation brightness temperature, sea surface temperature and roughness information, which are sensitive to changes in ocean salinity, and inverts high-precision global ocean salinity parameters. In addition, surface soil moisture information can also be obtained.This satellite, together with the HY-2 satellites and the CFOSAT Satellite , builds the integrated ocean dynamic environment satellite system.