China's Space Program Thread II

[taxiya]

I agree with you on most points. If Space Pionner could hold their promises. I still think it's faster than the national team. Built a F9-class rocket from blueprints to actual flight within a year. while we still need at least 2~ 3 years before we can see an actual CZ-10 on testing with current CASC's plan. The Space Pionner must have got rid of many of old-school testing procedures.

It is publicly anounced in a ppt now, does not mean they begin to build afterwards. What if the 3.8m tank built by 800 factory two years ago was part of this rocket.

 

[by78]

High-resolution images from the latest Long March 5 launch that successfully lofted Yaogan-41 into orbit. This marks the 502nd flight of the Long March series.

 

[by78]

 

[escobar]

Big GEO optical sat for persistent surveillance, with probably the 4 m diameter SiC aspheric mirror, which is the largest reported worldwide. Rayleigh criterion (GSD=1,22λh/D) give a resolution of 6m.

This resolution is enough for ship identification and aircraft detection. And if YG-41 also have thermal IR capability (like Gaofen-4) then it can also do aircraft tracking and missile warning. CN has another sat project using lightweight diffractive membrane optics for better resolution from GEO.

 

[Blitzo]

sir how can we compare ZQ-3 with LM10 rocket.. both rockets comes under different class category and purpose ..

LM10 total take off mass will be 2100 tons with 70 tons capacity in LEO and 27 tons capacity in trans lunar.. strictly for crewed mission

ZQ-3 total take off mass will be 660 tons with 21 tons capacity in LEO

TL3H with 68 tons payload in LEO and 42 tons into a 500-km sun-synchronous orbit.. this is somewhat comparable with LM-10
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LM10A will be reusable with 14 tons capacity in LEO. this is where ZQ-3 can come.

Well yes I am comparing the three core CZ-10 with the TL-3H, and the single core CZ-10A with the TL-3 and ZQ-3.

They're all in rather similar categories really.

 

[gpt]

This resolution is enough for ship identification and aircraft detection. And if YG-41 also have thermal IR capability (like Gaofen-4) then it can also do aircraft tracking and missile warning. CN has another sat project using lightweight diffractive membrane optics for better resolution from GEO.

Largest recon sat launched by China, or anyone else besides US with Space Shuttle and Delta IV Heavy for that matter, those three LVs are the only ones with the required dimensions and upper stage capability. Russia's Proton and Falcon Heavy's fairings are a tad too small.
So this is a big deal: not only has China caught up in heavy launch capability (incl. high mass, high energy orbits) but also the materials and optics industries necessary to produce these satellites.

 

[anzha]

A Mars quadcopter capable of autonomous flight and sample collection: Structure and avionics

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Deflecting asteroid Itokawa by subsurface explosion: Effect of explosion position on asteroid angular velocity change

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[luosifen]

Getting a haircut in space:

 

[escobar]

Big GEO optical sat for persistent surveillance, with probably the 4 m diameter SiC aspheric mirror, which is the largest reported worldwide. Rayleigh criterion (GSD=1,22λh/D) give a resolution of 6m.

@Kalec found this old interview of Li Guo, the chief designer of Gaofen-4. He said the 3rd stage of optics series will be "having a primary mirror with a diameter of 3-4 meters and a resolution of 5-3m". "it will reach the peak of traditional opticsand the 4th stage we will explore other type of telescope". Also some paper suggests that the 4m mirror may be too heavy to be launched to GEO and is reserved for ground-based telescope; then YG-41 use the 3m mirror.

 

[escobar]

@Kalec found this old interview of Li Guo, the chief designer of Gaofen-4. He said the 3rd stage of optics series will be "having a primary mirror with a diameter of 3-4 meters and a resolution of 5-3m". "it will reach the peak of traditional opticsand the 4th stage we will explore other type of telescope". Also some paper suggests that the 4m mirror may be too heavy to be launched to GEO and is reserved for ground-based telescope; then YG-41 use the 3m mirror.

Li Guo talking about high-res optical imaging technology from GEO:
1st stage Gaofen-4 with 50m resolution
2nd stage 15m resolution, Gaofen-13
3rd stage 3-5m resolution with 3-4m mirror, probably Yaogan-41
4th stage 1-2m resolution using "Open system imaging", "quantum imaging system", "thin film radiographic imagin system" etc