highaltitude.log.20081225

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[11:54] <rjharrison> +
[11:54] <rjharrison> Merry Christmas all
[11:54] <rjharrison> Any one got any noce toys from santa ?
[11:54] <rjharrison> nice
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[12:17] <rjharrison> Anyone listening today?
[12:19] <Hiena> Yeah, but the anibiotics doing a little damping in my head.
[12:22] <rjharrison> oh dear, sounds like your not feeting too well
[12:22] <rjharrison> Chritmas day too
[12:24] <Hiena> Nope. The last five day i enjoyed a bloody bacterial infection.
[12:24] <Hiena> Timed right to the holydays.
[12:24] <Hiena> The first three day i even can't talk.
[12:25] <rjharrison> Mightmare !!! Hope you get better soon
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[12:27] <Hiena> Well, I'm getting better. Now i could wield the basic power tools, so i'll be back on the track within a few days.
[12:29] Nick change: Bluenarf -> EI5GTB
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[20:27] <Laurenceb> happy christmas folks
[20:30] <SpeedEvil> :)
[20:30] Action: SpeedEvil has been having a different xmas.
[20:30] <SpeedEvil> Involving roof+concrete+ladders :/
[20:42] <Laurenceb> hehe
[20:42] <Laurenceb> heres what i (didnt) get for christmas
[20:42] <Laurenceb> http://orbitingfrog.com/blog/wp-content/uploads/2008/02/20080215-oxford-telescope-fail.thumbnail.jpg
[20:43] <SpeedEvil> :)
[20:44] <Laurenceb> spotted it ?
[20:44] <SpeedEvil> Of course.
[20:45] <Hiena> Ehem...
[20:45] <SpeedEvil> Random recommendation - I'm enjoying the 'Grantville Gazette' series. Which is series of books based off the 1632 series, which is about a small american town mysteriously dropped in germany in the middle of the hundred years war.
[20:46] <Laurenceb> o.....k...
[20:46] Action: Laurenceb doesnt read
[20:47] <Hiena> http://adsoftheworld.com/media/print/orion_telescopes_saturn?size=_original
[20:47] <SpeedEvil> It's slighly on-topic, as there have been hot-air dirigibles in it :)
[20:47] <Hiena> http://adsoftheworld.com/media/print/orion_telescopes_moon?size=_original
[20:48] <Hiena> http://adsoftheworld.com/media/print/orion_telescopes_mars?size=_original
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[21:32] <natrium42> edmoore, so... any new radios under the tree?
[21:33] <edmoore> mmm :)
[21:34] <edmoore> 83.6^2
[21:34] <natrium42> lol
[21:34] <natrium42> :D
[21:35] <edmoore> doesn't come with a psu though, which is annoying
[21:35] <edmoore> will have to get on ebay
[21:35] <natrium42> computer psu works
[21:35] <edmoore> I have some Hawker Odyssey SLA batts left over from robot wars that'll be perfect for mobile operation, though
[21:35] <natrium42> just connect all 12V lines together
[21:36] <edmoore> I tend to get through ATX PSus at a rate
[21:36] <natrium42> aah
[21:36] <edmoore> maybe I'm not modding them properly
[21:36] <edmoore> but used to run chargers off them and they'd pop before too long
[21:36] <natrium42> there's limited current that you can draw from a line
[21:38] <edmoore> yeah. I overdid it. But we didn't have much time between battles
[21:38] <edmoore> anyway, have spotted a 20A job on ebay for £50 so will try for that
[21:39] <natrium42> :D
[21:39] <edmoore> and a couple of PL259<->BNC adaptors
[21:39] <edmoore> and maybe a peli case for everything :)
[21:40] <edmoore> right, better get back to drinking and eating - bbl!
[21:40] <natrium42> later
[21:41] <natrium42> have fun :)
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[22:30] <Laurenceb> hello
[22:30] <Laurenceb> I was just watching top gear - brilliant stuff
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[23:04] <Laurenceb> http://wiki.ukhas.org.uk/code:sqrt_density_lookup_table_calculator_for_fast_drag_coefficient_calculations
[23:06] <SpeedEvil> won't that jump?
[23:07] <Laurenceb> how do you mean?
[23:07] <SpeedEvil> 24999->25001
[23:07] <Laurenceb> sure
[23:07] <Laurenceb> it uses a 100m layered atmospheic model
[23:08] <Laurenceb> i.e. you record windspeed during the ascent over each 100m interval
[23:08] <Laurenceb> then use it during the descent
[23:08] <Laurenceb> for optimal navigation or landing spot prediction
[23:08] <Laurenceb> alternatively you could use a GFS model and have logarythmic altitude intervals
[23:09] <Laurenceb> thats what CUSF have done and it works really well
[23:09] <SpeedEvil> oh - right
[23:09] <SpeedEvil> you're not usiong the pressure data directly
[23:09] <SpeedEvil> so a jump between segments doesn't matter so much
[23:09] <Laurenceb> the table is sqrt(density)
[23:09] <SpeedEvil> what table?
[23:09] <Laurenceb> so you can use it for descent time trough a layer
[23:09] <Laurenceb> that that code produces
[23:10] <SpeedEvil> ah - right.
[23:10] <SpeedEvil> Sorry - slow today. Been doing annoying stuff on roof.
[23:10] <Laurenceb> :P
[23:10] <Laurenceb> I've written an optimal navigation routine that works out air density on the fly
[23:11] <Laurenceb> but the calculations take about 20000 cycles on an avr
[23:11] <SpeedEvil> works out air density?
[23:11] <SpeedEvil> By looking at sink speed?
[23:11] <Laurenceb> using a model
[23:11] <SpeedEvil> err - rise speed
[23:12] <Laurenceb> basically running that code stright on the avr
[23:12] <Laurenceb> but it takes about 500ms for a navigation filter update atm, and it has to run at 1hz
[23:12] <Laurenceb> so I'm going to move to a lookup table
[23:12] Action: SpeedEvil notes a 256 byte table of air densities at 200m intervals might be simpler and smaller.
[23:13] <Laurenceb> basically my technique is to use an extended kalman filter running at 1Hz to find drag coefficients
[23:13] <Laurenceb> then use recorded or GFS wind to integrate up from the ground
[23:13] <Laurenceb> and find how much a spiralling glider would drift
[23:14] <Laurenceb> then subtract that drift (in the horizontal plane) from the target waypoint
[23:14] <Laurenceb> and set that point as a temporary waypoint
[23:14] <SpeedEvil> fun.
[23:15] <Laurenceb> I think its as close to optimal gliding you can get without monte carlo
[23:15] <SpeedEvil> or better knowledge.
[23:15] <Laurenceb> the runtime is currently about 600ms on my avr for one iteration... which is a bit close for cumfort
[23:15] <Laurenceb> erm comfort
[23:15] <SpeedEvil> Why on earth do you need to run it per second?
[23:16] <Laurenceb> wel....
[23:16] <Laurenceb> my nav routine runs at 1Hz
[23:16] <Laurenceb> so it makes it a bit easier to design
[23:16] <SpeedEvil> Yeah - but you don't need a second per second update of the drag vector based on hour old data
[23:17] <Laurenceb> well you may be descending quite fast at points
[23:17] <SpeedEvil> Sure.
[23:17] <Laurenceb> and it needs to be updated as you descend
[23:17] <SpeedEvil> But if you're decending quite fast, you don't really care.
[23:17] <Laurenceb> yeah
[23:17] <SpeedEvil> As long as you peel off the layers.
[23:17] <Laurenceb> oh well if I dont use floats for _everything_ it will easily run at 1Hz
[23:18] <SpeedEvil> yeah - floats are evil.
[23:18] <Laurenceb> and using floats for something approximate like this is silly
[23:18] <Laurenceb> u08 gives less that 1% error
[23:18] <SpeedEvil> how often are you calling the air pressure table routine?
[23:19] <Laurenceb> 1Hz
[23:19] <Laurenceb> oops
[23:20] <Laurenceb> up to 255 Hz
[23:20] <SpeedEvil> precompute, and jam in a u08 table?
[23:20] <SpeedEvil> 255m density layers?
[23:20] <SpeedEvil> though 200m may make more sense if you're using 100m granularity
[23:21] <Laurenceb> SpeedEvil: thats my plan
[23:21] <SpeedEvil> When are you planning first cras^H^H^H^Hflight?
[23:21] <Laurenceb> lol
[23:21] <Laurenceb> well most of the hardware is done
[23:21] <SpeedEvil> :)
[23:21] <Laurenceb> I've just got very preoccupied
[23:22] <Laurenceb> with stupidly complex xode
[23:22] Action: SpeedEvil knows the way that goes.
[23:22] <Laurenceb> the eeprom is working as is the ground control
[23:22] <Laurenceb> but the RC receiver is too clever for its own good
[23:22] <SpeedEvil> Well - in my case it's limited times I'm feeling OK, plus way too much boring stuff to do.
[23:23] <Laurenceb> it has a failsafe mode that mucks stuff up
[23:23] <SpeedEvil> servo 'safe' positions on signal loss?\
[23:23] <SpeedEvil> ah
[23:23] <Laurenceb> yeah
[23:23] Action: SpeedEvil has to insulate house + redo bathrooms + fix roof + ...
[23:23] <Laurenceb> if you never give it a signal it doesnt go to failsafe
[23:23] <Laurenceb> :/
[23:23] <SpeedEvil> And then the long list of interesting stuff.
[23:23] <SpeedEvil> how many channel is it?
[23:23] <Laurenceb> so at bootup when the firware says "test the RC" you just have to ingore it
[23:24] <Laurenceb> 4
[23:24] <Laurenceb> its a corona DSP
[23:24] <Laurenceb> very nice
[23:24] <Laurenceb> ~ 20mm*5*25
[23:24] <SpeedEvil> Cute.
[23:24] <SpeedEvil> Done a range check?
[23:24] <Laurenceb> nope
[23:24] <Laurenceb> its not too important, and I havent soldered on the wings to the enclosure yet
[23:25] <Laurenceb> the cutdown cable is used as the antenna
[23:25] <Laurenceb> theres an RF splitter on the bottom
[23:26] <Laurenceb> I'm coding a testbench atm, so I can test the nav code with kml files
[23:26] <SpeedEvil> Or B) You could just fly it.
[23:26] <SpeedEvil> :)
[23:27] <SpeedEvil> Hmm.
[23:27] <SpeedEvil> http://www.google.co.uk/search?source=ig&hl=en&rlz=&=&q=base+jumping+locations+uk&btnG=Google+Search&meta=lr%3D
[23:27] <rjharrison> ping natrium42
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[23:33] <Laurenceb> there an altitude lock on the ground control - its always autonomous above 200m altitude
[23:34] <Laurenceb> the servo is also turned off if its below 150m and stationary for 8 seconds
[23:34] <Laurenceb> - theres a seperate smps for the servo
[23:40] <Laurenceb> oh theres a thermal fuse as well - just to make sure it doesnt blow itself up
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[23:41] <edmoore> evening all
[23:43] <Laurenceb> happy christmas ed
[23:43] <Laurenceb> http://digg.com/space/Schoolchildren_s_teddies_pictured_30km_above_Earth
[23:43] <edmoore> and you!
[23:43] <Laurenceb> its slowed down
[23:43] <Laurenceb> you need 2000
[23:43] <Laurenceb> :P
[23:44] <edmoore> of course its slowed down - it was 2 weeks ago!
[23:47] <Laurenceb> someone needs to investigate the digg curve
[23:47] <Laurenceb> oh well I'm afraid I'm going to get an early night - have fun folks
[23:48] Laurenceb (n=laurence@host86-133-67-102.range86-133.btcentralplus.com) left irc: "The day microsoft make something that doesnt suck is the day they make a vacuum cleaner"
[00:00] --- Fri Dec 26 2008