Doory-Sat

Doory-Sat [ADD]

Doory-Sat, formerly known as S-STEP 1 (Small SAR Technology Experimental Project), is an experimental South Korean small SAR satellite built by Hanwha Systems as a prototype for a future constellation.

The satellite features a flat-plate structure of 197 cm length, 106 cm width and only 20 cm height and mass of ~100 kg. The nadir face features the X-band SAR antenna while the zenith face is covered with solar cells.

The satellite encompasses several operational modes, including ScanSAR, VideoSAR, and stripmap modes, each of which offers different resolutions and capabilities, depending on mission requirements. The ScanSAR and VideoSAR modes provide resolutions of 1 m and 4 m, respectively, enabling the tracking of various conditions or interesting targets. The high-resolution stripmap mode offers a 1 m resolution and enables wide-area surveillance. Images and videos obtained through the SAR antenna are stored in the bus platform and transmitted to the ground at a speed of 1 Gbps through the X-band antenna. Furthermore, the inter-satellite link (ISL) in the S-band improves the communication capabilities of the satellite constellation and enhances mission capabilities at the system level.

The prototype satellite was launched on 4 December 2023 on the maiden orbital flight of the ADD's GYUB-TV2