Issue 40

China Launches Long March 4C with SAR Satellite

25 Jan 2022: China launched the first of a pair of radar satellites that will provide geological data following earthquakes and landslides. A Long March 4C lifted off from Jiuquan Satellite Launch Center in the Gobi Desert. The LM-4C carried the L-SAR 01A satellite, equipped with L-band synthetic aperture radar (SAR)…

25 Jan 2022: China launched the first of a pair of radar satellites that will provide geological data following earthquakes and landslides. A Long March 4C lifted off from Jiuquan Satellite Launch Center in the Gobi Desert. The LM-4C carried the L-SAR 01A satellite, equipped with L-band synthetic aperture radar (SAR), which will be used to monitor the geological environment, landslides and earthquakes. It is in a near-polar orbit of 98 degrees with an altitude of about 373 miles (600 kilometers). See Video.

– L-SAR 01A is the first of a group of two satellites. L-SAR 01B will launch at the end of February, according to the China National Space Administration.

– The satellites will fly in formation and provide geological insights after seismic events such as earthquakes, volcanic activity and landslides and aid relief efforts. The satellites will also conduct large-scale topographic surveys.

– The satellite is equipped with an L-band and multi-channel synthetic aperture radar (SAR) payload. It is a civilian satellite that will use a 33 square meter array. At 3.2 tons it is currently the largest Chinese SAR satellite in orbit.

This is comparable to the Argentinian SAOCOM satellites which are also equipped with L-band and a SAR to monitor environmental disasters.

– L-band makes it easier to monitor the Earth’s surface with the ability to penetrate clouds, rain, and vegetation. It operates in a frequency range of 1-2 GHz.

Long March 4C launch carrying L-SAR 01A.

L-SAR 01A satellite rendering.

L-SAR 01A spacecraft hardware.

L-SAR 01A mission patch.

L-SAR 01A near-polar orbit.