On December 22, 2020, China's first commercial SAR satellite "HISEA-1" jointly developed by the 38th Research Institute, CETC, and SPACETY at the request of Xiamen University and other units was successfully launched by a Long March 8 carrier rocket. As of January 22, 2021, the satellite has completed its one month of service in orbit.
It is reported that the satellite completed its status confirmation and SAR payload imaging test within one week after it entered the preset orbit.
In fact, the satellite completed its first imaging work in just three days (December 25) after it entered the orbit. Specifically, it successfully obtained the first batch of images in orbit, and put them into use immediately, which filled the gap of China's commercial SAR satellite and opened a road for data operation of the domestic commercial SAR satellite. That is regarded as of milestone significance.
Within the one month after the satellite was put into orbit, the relevant teams on the ground immediately carried out a number of in-orbit tests. The imaging work in strip-map/sliding spotlight mode was stable, and a large number of spaceborne SAR images were successfully obtained. After a 6.2 magnitude earthquake struck Mamuju, South Sulawesi, Indonesia, an emergency imaging task was urgently carried out, and the area was imaged at 11:56 on January 17, 2021.
The SAR images of the scene were submitted to the National Comprehensive Earth Observation Data Sharing Platform, and then further transferred to relevant agencies of the United Nations. The quick action and the quality of the images were spoken highly by the agencies.
HISEA-1 is the first flat and collapsible satellite made in China, weighing only 185kg and in a thickness of 7.5cm. Different from other international counterparts, the satellite uses a new antenna developed based on active phased array, which improves its overall equipment effectiveness (OEE) by three to five times.
At the same time, the satellite also has three main work modes, i.e. 1-meter resolution spotlight mode, 3-meter resolution stripmap mode, and 20-meter resolution scanning mode.