highaltitude.log.20110513

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[03:04] <griffonbot> @CollegeARC: Congrats Clarkson University, this just popped up in my Google Alert feed! #hamr #hamradio #arhab http://fb.me/12qn6s54d [http://twitter.com/CollegeARC/status/68874255567298560]
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[09:03] <fsphil> can anyone who's got a GoPro HD tell me if the focus can be adjusted at all?
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[09:56] <Ikarus> hrm, anyone ever considered doing a stabilised platform on a HA balloon (would love some nice repeat picture sequences of the same attitude)
[09:58] <Randomskk> chat to eroomde
[09:58] <SpeedEvil> eroomde did.
[09:58] <SpeedEvil> He's done a leeetle telescopy thing.
[09:59] <SpeedEvil> 'repeat picture sequences' ?
[09:59] <SpeedEvil> And what do you mean by stabilised.
[09:59] <SpeedEvil> Stabilised - or stabilised, and pointed at a computed target location.
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[11:09] <RocketBoy> Just a heads up - I'm expecting a launch out of EARS tomorrow - the guys from Kings College London - on 434.650MHz - XABEN format.
[11:14] <fsphil> cool, usual format (50 baud rtty, 8-bit)?
[11:15] <RocketBoy> yeah
[11:15] <RocketBoy> Might be 7 bits - I cant remember
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[11:54] <Laurenceb_> ok l;sm303dlh tested
[11:55] <Laurenceb_> 4milliguass rms noise at 75hz
[11:56] <Laurenceb_> thats 4x10^-7T, about half the noise of freescale mag3110
[11:56] <Laurenceb_> XD
[12:04] <SpeedEvil> What about at lower? 5-10hz?
[12:04] <SpeedEvil> That you might get on a slow and low ariel platform, or a little buggy?
[12:05] <SpeedEvil> 40nT is quite close to the peaks of 10nT in the above image
[12:10] <Laurenceb_> hmm its broken now
[12:10] <Laurenceb_> didnt seem to like my trying to run it at 150hz output rate
[12:14] <SpeedEvil> I meant if you average it. Though slower would be interesting too
[12:14] <SpeedEvil> Would be interesting if the noise on three channels is independant too.
[12:14] <SpeedEvil> (or if you're picking up field variations)
[12:15] <SpeedEvil> Fairly small stray currents...
[12:15] <SpeedEvil> 50hz...
[12:16] <SpeedEvil> There is of course the truly silly approach to reducing the noise by a factor of 10.
[12:16] <SpeedEvil> 100 sensors.
[12:16] <Laurenceb_> hmf this is odd
[12:16] <Laurenceb_> i think it might be broken
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[12:16] <Laurenceb_> seems to be limited to 5hz now
[12:17] <SpeedEvil> Strange.
[12:17] <Laurenceb_> i tried the register setting that should give 150hz output
[12:17] <SpeedEvil> You should get paid for rewriting the datasheet.
[12:22] <eroomde> There's another launch tomorrow too
[12:22] <eroomde> EADS Astrium
[12:22] <eroomde> from churchill
[12:24] <Randomskk> eroomde: what time is that? I think I'm helping?
[12:24] <eroomde> 'the morning'
[12:24] <Randomskk> yea, that's what I heard last
[12:24] <eroomde> i dunno, see their twenty page screed
[12:24] <Randomskk> heh
[12:25] <Laurenceb_> ok...
[12:25] <Laurenceb_> it needs some capacitance on the bus to work
[12:25] <Randomskk> don't think I have it
[12:25] <Laurenceb_> this is odd
[12:25] <Randomskk> I'll email for more details? need to mail about the CAM computer too
[12:43] <Laurenceb_> hmf no it always breaks
[12:43] <Laurenceb_> i suspect this might be to do with the bus pirate
[12:44] <Laurenceb_> :S
[12:46] <eroomde> Ikarus: hello
[12:46] <eroomde> i beleive someone point you in my direction about stabilised high altitude platform
[12:48] <SpeedEvil> Ikarus: To recap - do you mean just stopping the camera spinning - or pointing it at arbitrary targets.
[12:50] <Laurenceb_> ok... when i connect the scope leads it works for a while then breaks
[12:50] <Laurenceb_> no scope and the buspirate wont boot
[12:50] <Laurenceb_> what the hell
[12:50] <Laurenceb_> im going to have to give up on this - i suspect the magno works
[12:52] <Ikarus> SpeedEvil: pointing it at an arbitary direction
[12:53] <Ikarus> not so much target
[12:53] <SpeedEvil> You're going to need some sort of position reference at least.
[12:53] <SpeedEvil> Accel + magnetometer - probably gyro too.
[12:53] <Ikarus> SpeedEvil: yeah, that was the idea
[12:53] <Ikarus> but I was wondering if anyone did it before
[12:53] <SpeedEvil> What do you mean by 'pointing' +-10 degrees, or +-10 micro-arc-seconds.
[12:54] <Ikarus> more the latter :)
[12:54] <SpeedEvil> At astronomical targets?
[12:54] <SpeedEvil> You're looking at guide stars then I guess.
[12:54] <SpeedEvil> And star-trackers.
[12:54] <SpeedEvil> As you'll struggle to get much better than a degree with magnetometer I think.
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[12:55] <eroomde> Ikarus: hi
[12:55] <eroomde> I have done some work with this
[12:55] <eroomde> inertia sensors + data fusion + guide start tracking
[12:56] Action: Laurenceb_ rages at intertial sensors
[12:56] <Ikarus> eroomde: ooooh, guide star
[12:56] <Ikarus> nah, not astronomical
[12:56] <eroomde> Laurenceb_: try #electronics or a therapist
[12:56] <Ikarus> though it's an interesting use
[12:56] <Ikarus> it wasn't the one I was looking for quite
[12:56] <eroomde> Ikarus: what's your project?
[12:56] <Ikarus> eroomde: just tinkering at the moment
[12:57] <Ikarus> trying to get "good looking" footage
[12:57] <Ikarus> not so much useful
[12:57] <eroomde> with a view towards what?
[12:57] <eroomde> ah cool
[12:57] <SpeedEvil> Ikarus: Oh - you just mean you want pictures of the ground?
[12:57] <eroomde> of the night sky or, say, the ground?
[12:57] <SpeedEvil> Approximate pointing + georectification can do that.
[12:57] <Ikarus> SpeedEvil: or of the horizon, yes
[12:57] <SpeedEvil> You take a terrain model, the known position of your thingy, the approximate pointing, and then join up the edges.
[12:58] <eroomde> that doesn't sound that easy
[12:58] <Laurenceb_> oh dear
[12:58] <SpeedEvil> Accurately pointing so you can join without seams is several orders of magnitude harder.
[12:58] <Laurenceb_> epic epic fail
[12:58] <SpeedEvil> Sure - it's not that easy.
[12:58] <Laurenceb_> i was aditing the wrong config script
[12:58] Action: Laurenceb_ goes to get a coffee instead
[12:58] <eroomde> SpeedEvil: it's a research project
[12:59] <SpeedEvil> It's more easy than getting really accurate pointing info.
[12:59] <SpeedEvil> eroomde: yes - I know your one.
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[12:59] <Laurenceb_> always check what you editor is actually editing *facepalm*
[12:59] <SpeedEvil> :)
[12:59] <eroomde> correct
[13:00] <eroomde> i wouldn't bother trying to do an optimisation between elevation models and visual data. not unless you have to
[13:00] <SpeedEvil> It's rather easier if you're not trying to do it for surfaces like snow. :)
[13:00] <eroomde> you'd be surprised even then
[13:01] <SpeedEvil> The fact that snow has features?
[13:01] <eroomde> no, that it's not that much easier without snow
[13:01] <SpeedEvil> I can see it's possible - it's going to be somewhat harder I'd imagine, with the varying light reflectances and diffractions and refractions with angle making it even more fun.
[13:01] <SpeedEvil> Hmm.
[13:01] <eroomde> most of this is just arm-chair postulating and silliness. let's try and help Ikarus with something realistic
[13:02] <SpeedEvil> Ikarus: I would also ask over on #openstreetmap
[13:02] <SpeedEvil> Ikarus: About people with experience on georectifying images.
[13:02] <SpeedEvil> Indeed - more info on what's trying to be achieved is always good.
[13:02] <SpeedEvil> Well - unless it leads to conspiracy charges.
[13:03] <SpeedEvil> #openstreetmap over on irc.oftc.net
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[13:13] <Laurenceb_> http://i.imgur.com/PuBou.png
[13:13] <SpeedEvil> Is that randomly wobbling it?
[13:14] <Laurenceb_> yes
[13:14] <SpeedEvil> It looks nice and smooth.
[13:14] <Laurenceb_> i managed to screw it up massively
[13:14] <Laurenceb_> think it was my watch
[13:14] <SpeedEvil> Haha.
[13:14] <SpeedEvil> One with hands?
[13:15] <Laurenceb_> http://i.imgur.com/6jxZt.png
[13:15] <Laurenceb_> yes
[13:15] <SpeedEvil> That's impressive.
[13:15] <Laurenceb_> thats not one datapoint its about 20
[13:15] <Laurenceb_> making me think my watch
[13:15] <SpeedEvil> Shows how stupily sensitive it really is.
[13:16] <SpeedEvil> I wonder what happens if you put it next to a normal mains cable. How well can you read the differential field.
[13:17] <Laurenceb_> bbl
[13:17] <BrainDamage> how much those costs?
[13:17] <Laurenceb_> £8.5
[13:17] <SpeedEvil> I assume nobodies tried to buy gaseous ammona?
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[13:29] <Laurenceb_> good for rcs
[13:30] <SpeedEvil> I'm idly wondering about refrigeration.
[13:31] <Laurenceb_> theres plenty of refrigerants that are easy to buy
[13:31] <Laurenceb_> just look on ebay for eg
[13:31] <SpeedEvil> I mean absorbtion.
[13:31] Action: Laurenceb_ tried to rebair a fridge last year
[13:31] <Laurenceb_> *repair
[13:31] <Laurenceb_> turned out the crack was inside the internal heat exchanger so i had to chuck it :(
[13:33] <SpeedEvil> You're familiar with the icy ball thingy I take it?
[13:46] <Laurenceb_> yes lol
[13:46] <Laurenceb_> oh dear - lift repair guy just got stuck inside the lift shaft here
[13:49] <Laurenceb_> seems he broke the automatic door tronics and entombed himself
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[13:54] <SamSilver> Laurenceb_: do you use one of these?
[13:54] <SamSilver> http://www.gizmoforyou.net/site/en/shop/atten-at858d-rework-station.html
[13:55] <Laurenceb_> no but i have a couple of hot air stations
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[13:58] <Laurenceb_> ZD939A - its crap
[13:59] <Laurenceb_> and a blackjack BK6000 , its awesome
[14:00] <SamSilver> let me google it
[14:03] <SamSilver> what does a "smoke absorber" do?
[14:03] <Laurenceb_> eats smoke
[14:04] <SamSilver> okay I just read about it I never knew that
[14:04] <Dan-K2VOL> It uses a charcoal filter to filter vapor and smoke particulates out of the air
[14:10] mattltm-alt (~mattltm-a@mail.icm2.org.uk) left irc:
[14:11] <Laurenceb_> http://www.theregister.co.uk/2011/05/12/navy_spits_out_6kg_fire_and_forget_missile/
[14:11] <Laurenceb_> intertesting
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[14:26] <NigeyS> boing boing boing
[14:26] <NigeyS> !top10
[14:26] <HAMBotty> Top10(words): 1. eroomde(2108) 2. NigeyS(2050) 3. SpeedEvil(1712) 4. fsphil(1644) 5. Randomskk(1134) 6. jonsowman(934) 7. Josh_(818) 8. Dan-K2VOL(787) 9. MNSP(757) 10. jcoxon(746)
[14:26] <NigeyS> :o
[14:27] <Randomskk> oh no, I'm slipping
[14:27] <Randomskk> what if I /msg it?
[14:28] <NigeyS> err.. might work lol
[14:28] <Randomskk> apparently not :(
[14:28] <NigeyS> aww
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[14:28] <NigeyS> dont think ive set it up properly for in here
[14:28] <Randomskk> hmm. friday afternoon
[14:28] <Randomskk> supervision over
[14:28] <NigeyS> its the weekend! yey .. what you upto this w/e ?
[14:29] <Randomskk> I need to... tidy my room, do an examples paper, prepare a short speech for the engineering open day, try to fit this solenoid and stepper into my nerf gun, work on my motor controller design, make revision notes, send some emails
[14:29] <Randomskk> probably more stuff
[14:29] <Randomskk> I should get started!
[14:29] <Randomskk> kinda sleepy though
[14:30] <natrium42> hai giuse
[14:30] <Dan-K2VOL> Hola
[14:30] <NigeyS> lol a nice busy weekend then eh
[14:30] <NigeyS> hey natrium42 , Dan-K2VOL
[14:30] <natrium42> what's up?
[14:30] <natrium42> anything up at all?
[14:30] <Randomskk> oh wow, this student finance company questionnare
[14:30] <NigeyS> natrium42, when are you invading our shores ?
[14:30] <Randomskk> has drag and drop to answer
[14:31] <Dan-K2VOL> Hi nigey
[14:31] <natrium42> NigeyS: tomorrow
[14:31] <Randomskk> there's a box with a statement in, and I drag it into 1 to 10
[14:31] <NigeyS> lol Randomskk .. technology eh :p
[14:31] <natrium42> still in moscow
[14:31] <Randomskk> that seems so unnessecery
[14:31] <NigeyS> natrium42, right, you need, wellies, thermal underwear, and thick socks
[14:31] <Randomskk> aha, they're using YUI
[14:31] <NigeyS> oh and an umbrealla
[14:31] <natrium42> gah
[14:31] <NigeyS> :p
[14:32] <natrium42> i am flying through kiev
[14:32] <natrium42> maybe i should just stay there :P
[14:32] <NigeyS> Randomskk, student finance the same as student loans ?
[14:32] <Randomskk> yea
[14:32] <NigeyS> oh fun
[14:32] <Randomskk> it's an optional questionnaire thing so I'm not too fussed
[14:32] <NigeyS> natrium42, stay in russia, it's probably warmer than here! lol
[14:33] <NigeyS> i got overpaid by student loans once, took them 2 years to ask for the money back, and that was after telling them they did it!
[14:34] <Randomskk> nice
[14:34] <Randomskk> they are a bit useless
[14:35] <NigeyS> funny thing was, they tried blaming me .. like .. umm .. no, you guys paid it in twice, i didn't !
[14:36] <natrium42> NigeyS: it was 20C for a few days here
[14:36] <natrium42> though today is a bit rainy
[14:36] <NigeyS> meh its about 16 here in cardiff, quite windy, but no rain so far :D
[14:37] <jkominar> natrium42 you launching anything soon?
[14:37] <natrium42> lol http://pastie.org/1896988
[14:38] <natrium42> somebody tell W0OTM that i am AWOL
[14:38] <natrium42> jkominar: no plans yeyt
[14:38] <natrium42> jkominar: did you launch yet?
[14:38] <NigeyS> lol ahh think he doesnt know ure on a travel trip
[14:39] <W0OTM> hello
[14:40] <W0OTM> natrium42: ur my HERO!
[14:40] <W0OTM> LOL
[14:40] <natrium42> lolol
[14:40] <natrium42> wat
[14:40] <W0OTM> LMAO
[14:40] <SpeedEvil> Laurenceb_: I saw that missile.
[14:40] <W0OTM> ive been looking for you :)
[14:40] <NigeyS> lol hey W0OTM
[14:40] <W0OTM> Hey NigeyS
[14:41] <NigeyS> SpeedEvil, ? missile? wtf u been playing with now?!
[14:41] <SpeedEvil> Laurenceb_: I've been wondering why nobodies been trying for something like that - for example a guided 25mm round.
[14:41] <SpeedEvil> The link to the reg above.
[14:41] <jkominar> natrium42: naw... sadly the project has been on the shelf since November. I switched jobs and had a second kid in the meantime, so it got shelved for a while. It's about time to start getting ramped back up on it though with the weather getting so nice.
[14:41] <Laurenceb_> smart mortars are easy
[14:41] <Laurenceb_> stick 2.4ghz cam in the nose and rc gear for the fins
[14:41] <NigeyS> oo that the new 6kg tiny infrared thingy ?
[14:42] <SpeedEvil> I was meaning more positioning.
[14:42] <jkominar> everything's more or less ready to go. Just have to re-test the electronics, get a launch kit of tools together, buy the helium and pick a day.
[14:42] <Laurenceb_> hmm cal code runs on the magno
[14:43] <Laurenceb_> 2.2335e-03 2.2060e-03 2.3573e-03 -1.3868e+02 4.3852e+01 -1.2837e+02
[14:43] <SpeedEvil> sensitivity/offsets?
[14:43] <Laurenceb_> gains in earth field/lsb, and offset in lsb
[14:43] <Laurenceb_> yes
[14:43] <W0OTM> natrium42: do you have a few min?
[14:44] <Laurenceb_> residual after convergence is 32milliearthfields
[14:44] <natrium42> jkominar:looking forward towards the launch
[14:44] <SpeedEvil> you mean the su of the offsets?
[14:44] <SpeedEvil> vector sum
[14:44] <Laurenceb_> its the residual of the spheroid fitter code
[14:45] <Laurenceb_> so average offset of a point from the side of the spheroid
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[14:45] <SpeedEvil> Oh - the unfitted error.
[14:46] <Laurenceb_> so about 14lsb
[14:46] <Laurenceb_> hmm theres obviously other errors creeping in
[14:46] <SpeedEvil> Hard iron?
[14:46] <Laurenceb_> should be <5lsb from rms noise
[14:46] <SpeedEvil> Or do I mean soft
[14:46] <SpeedEvil> hard would just be an offset of the errors?
[14:46] <Laurenceb_> isnt hard and soft iron just gain and bias
[14:47] <Laurenceb_> i calibrated for gain and bias only
[14:47] <Laurenceb_> i suspect maybe there is cross axis coming in
[14:47] <SpeedEvil> umm
[14:47] <SpeedEvil> I think soft iron can cuase assymetry of the earths field.
[14:47] <SpeedEvil> Meaning that if you rotate it, it's no...
[14:47] <Laurenceb_> hmm
[14:47] <SpeedEvil> no - that doesn't make sense.
[14:48] <SpeedEvil> Oh - if it's soft iron on the board, it will distort the field into a non-spheroid I think.
[14:48] <SpeedEvil> If there is any assymetry in the earths field that you're measuring, then your solution will be wacked.
[14:48] <Laurenceb_> well look at it this way - i have about 10lsb or unexplained noise, thats 1.27 degrees
[14:49] <Laurenceb_> not the end of the world but a little annoying
[14:49] <SpeedEvil> How much of this is simple noise?
[14:49] <Laurenceb_> 4lsb/sample approx
[14:49] <SpeedEvil> What's it look like stationary?
[14:49] <SpeedEvil> ah
[14:49] <Laurenceb_> so to a very rough approx theres 10lsb extra error from... somewhere
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[14:49] <Laurenceb_> could be my watch or something
[14:50] <SpeedEvil> I assume you don't have a CRT nearby?
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[14:55] <Laurenceb_> no tft
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[14:56] <SpeedEvil> Hmm.
[14:56] <natrium42> bye all
[14:56] <SpeedEvil> 50Hz copper needs to be what - 6mm thick to mostly kill the external field?
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[14:59] <Laurenceb_> yes something like that
[14:59] <Laurenceb_> http://i.imgur.com/dWfQ8.png
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[14:59] <Laurenceb_> red=uncal, blue calibrated
[15:02] <SpeedEvil> Hmm.
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[15:07] <Laurenceb_> odd thing - according to datasheet spec, feild is 12% too low
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[15:10] <Laurenceb_> http://gravmag.ou.edu/mag_earth/magnetic_field_a.gif
[15:10] <Laurenceb_> im getting 430milliguass, should be close to 490
[15:10] <SpeedEvil> Isn't that 430?
[15:11] <SpeedEvil> Oh - nvm
[15:11] <SpeedEvil> 480 - yeah
[15:11] <Laurenceb_> http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml
[15:12] <Laurenceb_> im spot on the 490 line
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[15:24] <Laurenceb_> http://en.wikipedia.org/wiki/Skylon
[15:24] <Laurenceb_> "In April 2011, REL announced that they had secured $350 million of further funding"
[15:24] <Laurenceb_> what the?!
[15:24] <Laurenceb_> someones got gambling issues
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[15:36] <eroomde> RocketBoy: what frequency are you on tomorrow?
[15:36] <RocketBoy> .650
[15:36] <eroomde> h'ok ta
[15:36] <eroomde> and what's your launch time do you know?
[15:37] <RocketBoy> gues about 12:00
[15:37] <RocketBoy> guess
[15:37] <eroomde> ok
[15:38] <eroomde> we have some guys from astrium coming to launch one tomorrow
[15:38] <RocketBoy> are the astrium guys on the same FREQ?
[15:38] <eroomde> not sure what freq they're on
[15:38] <eroomde> but they bought one of rob's boards and i think rob stays clear of 650 so hopefully ok
[15:38] <RocketBoy> Ah OK
[15:38] <Randomskk> how has it taken them this long with a pre-bought flight computer?
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[15:39] <eroomde> yep they're on .075
[15:40] <eroomde> Randomskk: not on public channels please
[15:40] <eroomde> but yes, exactly
[15:40] <RocketBoy> phew - don''t want a repeat of last time
[15:41] <eroomde> yes that would be jolly annoying
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[15:48] <Randomskk> eroomde: any idea where I might find long M2 bolts in town?
[15:51] <eroomde> Randomskk: Mackays
[15:51] <Randomskk> cool, I'll check them tomorrow
[15:53] <Randomskk> :( so far
[15:53] <eroomde> bbl
[15:54] <Laurenceb_> right 75hz magno works
[15:54] <Laurenceb_> http://i.imgur.com/c9dOt.png <-chucking the pcb about on my desk
[15:55] <BrainDamage> if you move a diamagnetic material nearbry, say Al, can you detect that?
[15:57] <Laurenceb_> doubt it
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[16:37] <Laurenceb_> hmm interesting 12.67190 0.67845 -2.66590, 0.67845 16.10640 1.65069, -2.66590 1.65069 16.94781
[16:37] <Laurenceb_> thats the coveriance matrix for the magno in lsb
[16:38] <Laurenceb_> z axis has a bit of correlation with the other axes
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[18:47] <Laurenceb> sup
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[19:32] <Laurenceb> hmm got the magno error down to 0.75degrees
[19:32] <Laurenceb> the noise is actually 3 times as good as the freescale mag3110
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[19:33] Action: Laurenceb is adding cross axis/nonorthogonality to the fitting code
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[19:38] <SpeedEvil> Neat.
[19:38] <SpeedEvil> Is that 0.75 degrees of error in the pointing of the magnetic vector, or the pointing once you convert it to a compass reason.
[19:38] <SpeedEvil> reading
[19:39] <Laurenceb> pointing of vector
[19:40] <Laurenceb> or rather the mean distnace between a corrected vector and the spheroid wall expressed as an angle
[19:40] <SpeedEvil> :)
[19:40] <Laurenceb> with the guassian noise taken off
[19:40] <Laurenceb> 400nT rms noise at 75hz
[19:41] <Laurenceb> compared to 1uT at 80 for the mag3110
[19:41] <SpeedEvil> Not bad at all.
[19:41] <SpeedEvil> What's it look like when you filter it down to a hertz or two?
[19:41] <Laurenceb> 40nT or so
[19:42] <Laurenceb> oddly the x axis has lower noise, and the z axis is correlated with x and y
[19:42] <SpeedEvil> How sure are you that it's not environmental - some of it.
[19:42] Action: SpeedEvil wonders what you'd call a spherical fft.
[19:42] <Laurenceb> well yeah it may well be - it was in one position for the averaging
[19:43] <Laurenceb> i have some magnetic sheilding tap esomewhere
[19:44] <SpeedEvil> Take the FFT of - say - 48 vectors multiplied by the output vetor.
[19:44] <SpeedEvil> So you can see if you have an X Hz 'hum' pointed northwest.
[19:44] <Laurenceb> hmm ok.. ill finish the cross axis cod fiirst
[19:44] <SpeedEvil> Probably simpler just to rotate it.
[19:44] <Laurenceb> massive jacobian to work out by hand :S
[19:44] <SpeedEvil> And look for peaks.
[19:48] <Laurenceb> http://pastie.org/1897972
[19:48] <Laurenceb> hardware status, x,y,z, ignore
[19:48] <SpeedEvil> On reflection, the above suggestion would simply resolve to the FFT of X,Y,Z.
[19:49] <SpeedEvil> And then plotting the resultant
[19:50] Action: SpeedEvil tries to think out exactly how to plot it, and explodes.
[19:52] Action: Laurenceb tries to work out the jacobian and explodes
[19:52] <Laurenceb> M_measured=C*(M_data-bias)
[19:53] <SpeedEvil> A neural network will solve it!
[19:53] Action: SpeedEvil passes Laurenceb a small dog, and some platinum electrodes.
[19:53] <Laurenceb> where C is 3x3 matrix and bias is a vector, then i take M_measured.M_measured-1
[19:53] <Laurenceb> and try to make it =0 using newton raphson with matrix pseudoinverse
[19:53] <Laurenceb> with involves finding the jacobian of that model
[19:54] <SpeedEvil> I think at one point, I would have known what the words meant in there.
[19:54] <Laurenceb> lol nvm then
[19:54] <SpeedEvil> Unfortunately, my calculus-fu has faded. :)
[19:54] <SpeedEvil> It can be helpful to explain stuff, even to rocks. :)
[19:55] Action: Laurenceb is hoping to get it down to 1milliradian pointing error
[19:55] <Laurenceb> thats about what geckosenator got iirc
[19:55] <SpeedEvil> How good can you get with accels easily?
[19:55] <SpeedEvil> I.E. - overall pointing
[19:55] <Laurenceb> milliradian or so
[19:56] <Laurenceb> with the low drift st ones
[19:56] <SpeedEvil> So that's what - 3mr ish on heading?
[19:56] <Laurenceb> yeah something like that
[19:57] <SpeedEvil> Very interesting accuracy potentially.
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[19:59] <SpeedEvil> If you could get optical flow from something, you could almost ditch GPS.
[20:01] <SpeedEvil> As another random app - if you could make it small and cheap - you could have applications for body motion tracking. Though gyros+accel would work almost as well there.
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[20:45] <Laurenceb> oh wait
[20:45] <Laurenceb> i did the calculation wrong, non guassian errors are actually only ~1lsb
[20:45] <Laurenceb> so thats 2 milliradians already XD
[20:45] <SpeedEvil> :)
[20:46] <Laurenceb> not really any point with cross axis
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[20:47] <Laurenceb> - i hadnt added the root part into the rms error calc
[20:50] <Laurenceb> quite impressive performance then - very linear and orthogonal axes
[20:53] <Laurenceb> non-linearity, non-orthogonality and hysteresis comes in at just over 1 lsb rms error
[20:53] <SpeedEvil> Wow.
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[20:54] <Laurenceb> not quite fair as you wont see at effects all the time
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[21:07] <eroomde> Nuts and Volts is guest publication in Have I got news for you
[21:08] <eroomde> the only time i've known a blank
[21:09] <NigeyS> haha love it
[21:11] <eroomde> 'Female Electronics graduate Lady Ada has created a device called the incapacitator that causes nausia, dizziness and vomiting. something of a must-have when you're the only girl in the electronics faculty'
[21:12] <mattltm> lol.
[21:12] <NigeyS> lol'z
[21:13] <eroomde> why am i in on a friday night :|
[21:13] <mattltm> I have an ill dog. Thats my excuse.
[21:14] <NigeyS> im a saddo, thats my excuse
[21:14] <eroomde> i didn't want to drink this evening and everyone else did
[21:14] <eroomde> in the end i'm sat here with a beer watching iplayer
[21:14] <eroomde> fail
[21:14] <eroomde> in every sense
[21:14] <NigeyS> lol awwww
[21:15] <eroomde> empty vim buffer that I naively imagined might be full of cool stuff by now
[21:15] <eroomde> my python mega-rtty-decoder
[21:17] <eroomde> anyone use ubuntu with dual screens here?
[21:17] <mattltm> Not at the moment but I have done in the past.
[21:17] <NigeyS> snap
[21:17] <eroomde> the nvidia driver confuses things
[21:18] <eroomde> makes the os see one big screen
[21:18] <NigeyS> ahh thats the twinview stuff
[21:18] <NigeyS> pain in the ass
[21:18] <eroomde> which makes fullscreen flash, eg youtube and iplayer, not work properly, i.e. snap toa signla screen
[21:18] <eroomde> yes twinview
[21:18] <eroomde> i'd much rather the userspace monitor control panel would handle it
[21:19] <NigeyS> iirc theres a load of stuff you need to manually add to the config
[21:20] <SpeedEvil> eroomde: yeah - I saw that too (HIGNFY)
[21:20] <eroomde> I'm not sure i have the patience to iterate through the crash, cp /etc/X11/org.conf_backup /etc/X11/xorg.conf cycle
[21:20] <NigeyS> hehe you love it :p
[21:20] <eroomde> gets a bit upsetting
[21:23] <griffonbot> @N9XTN: NSTAR #ARHAB Flight 11-B will not fly due to strong sfc winds and an unfavorable landing site forecast. www.nstar.org [http://twitter.com/N9XTN/status/69150791289667584]
[21:28] <griffonbot> @N9XTN: NSTAR #ARHAB Flight 11-B will not fly Sat from SASM due to fcst of strong sfc winds and landing nr Missori Rvr. www.nstar.org [http://twitter.com/N9XTN/status/69152014474551296]
[21:39] <eroomde> well, got it to display properly in one screen
[21:42] <eroomde> that's for the tip NigeyS - one of the metamodes has slightly improved things
[21:42] <NigeyS> yey! :D
[21:48] <Laurenceb> ok so redone the cal and error code properly - 1.1lsb rms non guassian error
[21:48] <Laurenceb> thats crazy good
[21:48] <SpeedEvil> Indeed!
[21:48] <SpeedEvil> Non gaussian - you mean you're assuming the noise is gaussian, or you've measured it?
[21:49] <Laurenceb> ive taken a few seconds of data with the thing resting on the table
[21:49] <SpeedEvil> ah
[21:49] <Laurenceb> and found the standard deviation - its 4.1lsb
[21:50] <Laurenceb> then i took that off the spheroid fitter rms error
[21:50] <Laurenceb> its not quite valid as the noise is different in different axes
[21:50] <Laurenceb> but to 1 decimal place or so
[21:57] <Laurenceb> noise looks guassian from the frequency spectum
[21:57] <Laurenceb> *spectrum
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[21:58] <eroomde> there's gassian and there's gasussian
[21:58] <eroomde> ok, time to shut up
[22:00] <Laurenceb> tho the *RAGEEEEE* bus pirate introduces a load of timing glitchyness
[22:00] <Laurenceb> so peaks could have been smeared out
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[23:10] <Laurenceb> hmm so 20 seconds averaging and the lsm will start to see some archaeological features
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[23:15] <Laurenceb> http://upload.wikimedia.org/wikipedia/commons/b/ba/Floating_core_fluxgate_inclinometer_compass_autonnic.jpg
[23:15] <Laurenceb> ^things have moved on a little since that XD
[23:16] <SpeedEvil> A teeny bit.
[23:16] <SpeedEvil> I still have somewhere schematics.
[23:16] <SpeedEvil> I think an old Elektor.
[23:17] <Laurenceb> guess i need to get some kalman filter code running now
[23:17] <SpeedEvil> You've got the accel working well?
[23:18] <Laurenceb> i think so
[23:18] <Laurenceb> havent fully tested all the sensors at the same time yet
[23:18] <Laurenceb> i need to write some bus pirate scripts, but its going to be slow
[23:18] <Laurenceb> maybe 10hz output for all
[23:20] <SpeedEvil> Sounds like with the time you've spent raging at the bus pirate, you could have made a nice stm32pirate. :)
[23:32] <Randomskk> Laurenceb: why /are/ you using a buspirate?
[23:32] <Randomskk> is this your autopilot board? why not stick basic software on the stm32 to shunt data over serial at 115200?
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[23:33] <Laurenceb> indeed
[23:33] <Laurenceb> i was trying to test it incrementally
[23:34] <Randomskk> fair enough
[23:34] <Laurenceb> actually i think i can use macros on the bus pirate
[23:34] <Laurenceb> dont laugh XD
[23:34] <Laurenceb> no i really should use the stm32
[23:34] <Randomskk> it's really easy
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[23:34] <Randomskk> https://github.com/adamgreig/Robot4/tree/master/SensorTest
[23:35] <Randomskk> some of that might even be vaguely relevant
[23:35] <Randomskk> probably not
[23:35] <Laurenceb> yeah im basically going to port over a ton of openpilot code
[23:35] <Laurenceb> their code is the shit
[23:35] <Laurenceb> right im off, cya
[23:36] <Randomskk> see you
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[00:00] --- Sat May 14 2011