Issue 44

China Launches Second Yaogan-34 Satellite

17 Mar 2022: China launched Long March 4C with a new classified Yaogan satellite into orbit from Jiuquan marking China's sixth orbital launch of 2022. Launch Video . - The Yaogan-34-02 satellite joins the first Yaogan-34, launched 30 Apr 2021. CASC states all Yaogan-34 satellites will operate as a network. - The first…

17 Mar 2022: China launched Long March 4C with a new classified Yaogan satellite into orbit from Jiuquan marking China’s sixth orbital launch of 2022. Launch Video.

– The Yaogan-34-02 satellite joins the first Yaogan-34, launched 30 Apr 2021. CASC states all Yaogan-34 satellites will operate as a network.

– The first Yaogan-34 satellite is in a 1,116 by 1,063km orbit inclined by 63°, closely matching the Yaogan-31 D/E/F satellite triplets.

– Yaogan-34-01 lags behind the Yaogan-31 D/E/F formation by approximately 10 minutes.

– Yaogan-34-02 is in a 1,097km low Earth orbit (LEO) with 63.4° inclination, similar to Yaogan-31 G/H/J.

– Yaogan-34-02 currently lags behind Yaogan-31 G/H/J by ~45 minutes.

– The Yaogan-31 satellites’ orbits suggest they are analogous to US DoD Naval Ocean Surveillance System (NOSS) satellite triplets. Watch Video of Satellite Triplets (Yaogan 16 & Yaogan 20).

NOSS satellites locate and track ships at sea by detecting radio transmissions and analyzing them using time-difference-of-arrival (TDOA).

– A mission success screen displayed at the Jiuquan Satellite Launch Center provided a rare potential clue as to the nature of the satellite with an image of a spacecraft bus in the top right.

– The Yaogan military Earth-observation satellites are reconnaissance satellites with a variety of uses. These range from scientific experiments to survey land and crops, and disaster and environmental monitoring. Beyond that, these satellites most likely also fulfill military services, but that is never communicated publicly by the Chinese operators.

– China’s official release stated the Yaogan-34 series “is mainly used for land census, urban planning, and land confirmation. It can meet the needs of rapid earth observation revisitation and provide information for China’s “Belt and Road” construction.

– This suggests Yaogan-34 is an optical remote sensing satellite.

– Pairing an optical remote sensing satellite with the Yaogan 31 triplets could yield the ability to “tip and cue” between sensors and use imagery to confirm ship or other target locations and identities.

– This launch also featured a test for future payload hosting on the Chang Zheng 4C third stage. This is comparable to the photon stage built by the American company Rocket Lab, in which the stage would conduct a second mission after the deployment of the primary payload.

Launch profile similar to previous Yaogan-34 and Yaogan-31 missions.

Yaogan-34-02 and Yaogan-31 G/H/J orbit visualization.

Spacecraft image shown on the Yaogan-34-02 mission success display.

Yaogan-34-02 mission success screen at the launch center.

Yaogan mission emblem.

Yaogan-34-02 orbit visualization.