JWST Solid State Recorder
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JWST Solid State Recorder
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Re: JWST Solid State Recorder
#2> ... JWST will downlink data in 4-hour contacts... In one contact, JWST can transmit at least 28.6 Gbytes
This works out to 2 MB/s.
Re: JWST Solid State Recorder
#3> ... JWST will downlink data in 4-hour contacts... In one contact, JWST can transmit at least 28.6 Gbytes This works out to 2 MB/s.
Surprisingly high IMO
Re: JWST Solid State Recorder
#4Re: JWST Solid State Recorder
#5> ... JWST will downlink data in 4-hour contacts... In one contact, JWST can transmit at least 28.6 Gbytes This works out to 2 MB/s.
Surprisingly high IMO
The DSN can receive data from MRO at Mars at up to 4 megabits per second, apparently. JWST is way closer, so it should be quite a bit faster.
Re: JWST Solid State Recorder
#6How does this storage hold up over time?
I'm guessing that could be one of the limiting hardware elements. There must be some redundancy in that right?
Re: JWST Solid State Recorder
#7Re: JWST Solid State Recorder
#8How does this storage hold up over time? I'm guessing that could be one of the limiting hardware elements. There must be some redundancy in that right?
Given the capacity, I would be surprised if it wasn't single-level cell NAND (larger write capacity) or redundant. From articles I could find, it was installed in the JWST in 2012[1] and developed by a company called SEAKR which produces "Solid State Recorders"[2]. Certainly doesn't look like any commercial server storage I've seen.
I imagine the contracts could be FOIAed here and specs like anticipated write capacity obtained, would be very interesting to learn about radiation hardening and redundancy for SSDs - err, solid state recorders - in space.
[1] https://www.electronicsweekly.com/news/business/information-... [2] https://www.seakr.com/our-technology/#products
Re: JWST Solid State Recorder
#9One of the interesting things about this is all the tooling created around the JWST. Like there is even a downloadable app that you use to plan & book time. Plus all the documentation, etc.
Re: JWST Solid State Recorder
#10I am sure there are better presentations out there, but this conference proceedings has some great pictures of the control systems in JWST [1]
I was also able to find a high resolution picture of the spacewire interface card with its glorious space grade asic packages [2]
Sadly the SSR is not shown, I assume that it is basically a gigantic sheet of sram and a fpga.
[1] https://www.researchgate.net/publication/233962152_Status_of...
[2] https://www.nasa.gov/vision/universe/watchtheskies/jwst_spac...