Hacker News new | ask | show | jobs
by Rebelgecko 24 days ago
>It happened so fast that there were only a few bits of telemetry between "everything normal" and "no signal".

SpaceX also had an architecture that added a lot of latency to their telemetry transmission (IIRC basically Ethernet bufferbloat)

1 comments

This is a good article about Amos-6: https://www.americaspace.com/2017/01/02/spacex-closes-amos-6...

"Investigators scoured more than 3,000 channels of video and telemetry data covering a very brief timeline of events – there were just 93 milliseconds from the first sign of anomalous data to the loss of the second stage, followed by loss of the vehicle."

I haven't seen anything about latency--are you sure that's a problem in the telemetry stack?

It featured heavily in the CRS-7 anomaly investigation (https://www.nasa.gov/wp-content/uploads/2018/03/public_summa...).

> SpaceX’s new implementation (for Falcon 9 “Full Thrust” flights) of non- deterministic network packets in their flight telemetry increases latency, directly resulting in substantial portions of the anomaly data being lost due to network buffering in the Stage 2 flight computer.

However it looks that finding might've actually been corrected in the months before Amos-6, so moot point!