China's Space Program Thread II

escobar

escobar

Brigadier
escobar said:
With the launch of YG-39 Group 5, SSF complete the deployment of the second gen of SIGINT constellation at 35-degree inclination. Fist gen is YG-30 (30 sats lunched in 4 years, from Sep-2017 to Sep-2021). In each triplet, The sats settled into formation, spaced at 120º intervals around the orbit (giving the constellation a revisit time of 30 minutes for most locations falling within its visibility range.) with an altitude of 600km . Sats are built by Innovation Academy for Microsatellites of CAS.

2nd Gen is YG-35/36/39 (45 sats launched in 2 years, from Nov-2021 to Dec-2023, built by CAST-DFH and SAST) with an altitude of ~500km and 35° inclination. Each group will pass over the same points above Earth at different times, providing more frequent coverage over areas of interest. In Each triplet two satellites line up along the orbit at a distance of 15–20° from each other, and the third, using a low-thrust engine, tries to stay close to the tail spacecraft of the main pair. The system has five orbital planes, spaced by 72° in the longitude of the ascending node, each with three groups of satellites, spaced by 120°.

So the two constellations are likely for collection and monitoring radio and radar signal (early warning radars, air defense and missile defense radars, missile telemetry, COMINT, etc..) The presence of additional optical or SAR surveillance equipment on the satellites cannot be ruled out. The choice of 35-degree inclination orbits is interesting. It provides coverage of the world’s major population centers as well as the most frequented shipping lanes including areas of interest like the South China Sea, North Korea, the entire continental U.S. and the Chinese mainland. Yaogan-30/35/36/39 provides china with a powerful tactical and strategic tool in the form of near-continuous insight into activities across the world’s oceans and geopolitical hot spots.
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by78

by78

General
High-resolution images from the successful launch of Yunhai-3 02 satellite (云海三号02星), which was carried out by a LM-6A launch vehicle. This marks the 514th flight of the Long March series.

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by78

by78

General
by78 said:
Progress update on the launchpad no. 2 of the Hainan Commercial Spaceport. The work crew has begun hoisting the steel girders that will hold up the water tank of the acoustic suppression system.

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All four lightning diversion towers for launchpad no. 2 of the Hainan Commercial Spaceport have been completed.

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A look at the main flame deflector trench for launchpad No. 2:
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T

taxiya

Brigadier
Registered Member
All Yunhai-1 and 2 are launched by CZ-2D whose SSO payload capability is up to 1.5t. All Yunhai-3 are launched by CZ-6A whose SSO payload capability is up to 4.5t. I wonder if there are other payloads launched together or if Yunhai-3 are much heavier or they just decided to "waste" the capacity and give CZ-6A more chances to prove itself.
 
A

anzha

Captain
Registered Member
Pop write up news:

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Planetary Society write up of Queqiao:

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Chinese military on orbit refueling approach:

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Attachment performance analysis and experimental study of lunar rock bionic attachment device based on DEM-MBD

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Effect of amine-based burning rate suppressants on the HTPB propellants: Thermal decomposition and combustion characteristics

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Accurate semantic segmentation of small-body craters for navigation

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