HY-2 (HaiYang means 'ocean' in chinese) is a marine remote sensing satellite series planned by China (HY-2A to HY-2D).
HY-2 belongs to a serie of ocean-oriented satellites :
HY-1A and HY-1B (respectively launched on May, 2002 and April, 2007) are designed to measure the ocean color and temperature with the visible and infrared sensor,
HY-2 is focused on the marine dynamic environnement,
HY-3 will combine visible/infrared and microwave sensors.
The objective of HY-2A is monitor the dynamic ocean environnement with microwave sensors to detect sea surface wind field, sea surface height and sea surface temperature. It includes an altimeter dual-frequency in Ku and C-bands, Doris, a scatterometer an a microwave imager.
The orbit is sun-synchronous: the first 2 years with a 14-day cycle (altitude 971 km), then one year with geodetic orbit (168-day cycle, 5-day approx. subcycle, altitude 973 km).
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