China's Space Program Thread II
- Thread starter Blitzo
- Start date
lcloo
Major
No, it is just color of anti-slip paint, green is also a common color of said paint. Anti-slip floor paints are common in Chinese factories.
Don't believe him simply because he used to work in ZTE. Was he a radio and baseband R&D engineer? Or just someone climbing towers and connecting cables? Tell you a fact, more than half of the engineers in this industry knows almost nothing about the details because that is not their job. Making a connection to Beidou network tells me that he is one of the unkowning with a oversized mouth.
Beidou's communication is far different and therefor unrelated to any kind of broadband communication. Beidou is advanced and efficient in its own communication application, that is short messaging. Such tech is not part of broadband package switching.
His claim that less efficient communication scheme leads to higher orbit is self-defeating argument becuase such scheme (modulation etc.) would demand lower orbit to compansate lower S/N resulted from the scheme. Speaking reversely higher orbit means better tech because UE can reliably recieve weaker signals from a longer distance, and has better satellite coverage.
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He was a senior RF engineer at ZTE and now working on spacecraft communication systems so I'd say he knows what he is doing. I'm pretty sure he did not refer to SNR as a issue but just said "is similar to how the Beidou system worked" and that he doesn't highly of this project and considering this is a lunch time discussion I understandably didn't bother pressing for more details.
If you have read various literature related to low orbit communication giant constellations in the Chinese literature database.
I highly doubt the viewpoint of your colleague.
Perhaps he is referring to the issue of frequency bands, as China uses frequencies much higher than the Ku/KA frequency band. This is the real weakness.