elfchief

9 ms·

31.
Ask HN: ICSI Netalyzr Replacement?
1 points by elfchief 7y ago|0 comments
32.
by elfchief 7y ago
That's the thing -- I do want to use the UI and I don't want to have to hand-edit XML. I just want the UI to not use the single worst dialog box in all of windows. I am baffled at why Backblaze clings so tightly to the existing
33.
by elfchief 7y ago
I've only ever had one problem with Backblaze, in my ... 7 or 8? ... years as a customer. The problem: The UI for excluding directories is horrific . It uses the Windows "Browse for Folder" *SHBrowseForFolder) dialog, which
34.
by elfchief 7y ago
Not the OP, but it'd see it as multiple SVs. Basically you figure out what the range would be from the SVs to whatever location you want the things to think they're at, and put out all the signals to make that happen. Spoofing a s
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by elfchief 7y ago
There's a bunch of maintenance stuff that happens regularly that's on that list... FCSTDV (stationkeepng burns), FCSTMX (scheduled maintenance, like switching to a different atomic clock or the like), that sort of thing. There&#x2
36.
by elfchief 7y ago
This ended up not being a problem with the GPS system at all -- it was actually a certain brand of receivers not dealing correctly with leap seconds[1] -- or, specifically, that it's been a while since the last leap second, which cause
37.
by elfchief 7y ago
Nominally, yes, but the positioning error (according to the spec) is expected to be up to 425m after 14 days, growing worse over time until it hits a positioning error of ~10km at 180 days. (later generation satellites have an 'autonav
38.
by elfchief 7y ago
They do (that's literally how GPS/GNSS works), but they drift, for various reasons. One of the parameters that GNSS networks broadcast is a clock correction (how far off each individual satellite's clock is, how fast it'
39.
by elfchief 8y ago
The week number is (somewhat) used for navigation, but the way it is used is not affected in any way by the rollover, and there's not really a way (even taking into account bugs) that not knowing what the current GPS epoch is could aff
40.
by elfchief 8y ago
If you want this straight from the spec, grab a copy of IS-GPS-200J (it's free, just google it), look at section 3.3.1.1, which talks about the carrier frequencies of the various signals. From that: "The carrier frequencies for th
41.
by elfchief 8y ago
Sure, gps geek and time-nut here. The rollover problem is a hard one to fix, because there's no reasonable way for a GPS (at least one using LNAV (legacy) signals -- pretty much all of them, though I don't know what modern passeng
42.
by elfchief 8y ago
Untrue. There's a newer format for NAV data -- CNAV. It's currently broadcast on the L2 and L5 bands, and does indeed include a larger week number field -- 13 bits to be exact.
43.
by elfchief 8y ago
This is like saying "there's no point in ECC if it can't correct every error" ... which simply isn't true. It's still far better to know that corruption exists -- so you can know something is invalid and potent
44.
by elfchief 8y ago
Is it just me or is it absolutely insane that zfs and btrfs are the only common filesystems out there that do data checksumming? I don't want or need the extra complexity of either of them in a lot of cases, but I'd sure as hell l
45.
by elfchief 8y ago
Now if only they'd sell me one. :/
46.
by elfchief 8y ago
Huh, weird. I ordered some CHIP Pros and dev boards in February last year, and got them in ~2 weeks. I haven't ordered from them since, so maybe they went defunct or something. I dunno. That's too bad. :(
47.
by elfchief 8y ago
Instead of the pi zero, check out the CHIP Pro ( https://getchip.com/pages/chippro ) ... a little more expensive, but available in quantity and designed to be pick & placed (or hand-soldered!), runs linux, and does m
48.
by elfchief 8y ago
What the link doesn't mention, that I can see, is what the first version affected was. Does this bug go back to the inroduction of submodules in git?
49.
by elfchief 8y ago
The 9/11 firefighters (especially the first responders that went in before the towers fell) were heroes by just about every definition, though. They risked (and in many cases gave) their lives to try to try to save innocent people. The
50.
by elfchief 8y ago
The main things that cause loss of GPS 'lock' are the satellite signals being blocked (buildings, terrain, people, etc in the way), and multipath (signals being reflected off buildings, terrain, etc). A munition a few thousand fee
51.
by elfchief 9y ago
I don't know for a fact how they manage it, but I bet the feedback is slow enough (those generators are heavy, and it probably takes a few cycles to even accurately measure a change) that they might not have to do much in the way of ac
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by elfchief 9y ago
One interesting thing about the "load changes the frequency" thing is that if you measure the frequency in enough places, you can actually see how large load changes "ripple" through the system. For example, there was a
53.
by elfchief 9y ago
Now what I would like to know is ... is this perl code on github?
54.
by elfchief 9y ago
I doubt you can even hit a target directly under you from a satellite in geosynchronous orbit, at least without a fairly significant amount of effort. You can't just fire a rocket "straight down" -- if you just point at the E
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by elfchief 9y ago
Yeah, this is really weird to me. They're talking about installing sensors on particular tracks and the like, after saying that it's GPS-based, but... why? Stick a GPS on the engine, load a database of maximum speeds, get instant
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by elfchief 9y ago
The PPS is just something you get when the GPS chipset has a lock, though (and sometimes when it doesn't, depending on how you have it configured). Most non-timekeeping GPS chipsets give you a PPS output for free, and 100% of timekeepi
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by elfchief 9y ago
Having an atomic clock behind your NTP server doesn't really gain you anything unless GPS is lost for an extended period of time. As long as a timeserver has a GPS lock, it's going to be disciplining the atomic clock the same way
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by elfchief 9y ago
I would really like #2 to have the option of sending encrypted files on disk or zip, and y'all providing a client that will decrypt them using my passphrase, locally. Nothing personal, but I really don't want y'all seeing m
59.
by elfchief 9y ago
Now, if Yahoo would just open source the yinst/opsdb/rolesdb/igor/etc ecosystem. I miss that elegant tooling so fricking much.
60.
by elfchief 9y ago
Now, if only all of microtype's features were available in Lua(La)Tex. They're the sole reason I'm still using pdfLaTeX, even though I end up not able to use opentype fonts. :/

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