highaltitude.log.20091226

[00:05] <Laurenceb> http://imagebin.org/76877
[00:06] <SpeedEvil> removed
[00:06] <SpeedEvil> oh
[00:06] <SpeedEvil> misread number
[00:07] <SpeedEvil> that's assuming 30C delta?
[00:08] <Laurenceb> 30C water temperature
[00:08] <Laurenceb> using average air temp data
[00:10] <SpeedEvil> why ar eyou doing that?
[00:10] <SpeedEvil> oh
[00:10] <SpeedEvil> you mean air temp water in
[00:16] <Laurenceb> I was assuming youd want water at a steady temperature
[00:16] <Laurenceb> gtg, cya
[00:17] <SpeedEvil> night
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[22:04] <Xenion> Good Night folks ! sleep well and have a look at http://twitter.com/PTScientists to see some cool Space related pictures :-)
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[22:09] <Laurenceb> Hello
[22:22] <Laurenceb> Randomskk: http://www.prweb.com/releases/2009/10/prweb3108684.htm
[22:22] <Randomskk> :o
[22:23] <Randomskk> screw all my other ones, that is a super neat solution
[22:23] <Randomskk> so long as it's sufficiently accurate, stable etc
[22:23] <Randomskk> finally a three axis integrated gyro
[22:23] <Randomskk> took them long enough
[22:23] <Randomskk> seeed shipped my motor controller PCBs
[22:23] <Randomskk> though to cambridge so it'l have to wait a few weeks
[22:24] <n900evil> I enquired about samples for the gyro.
[22:24] <n900evil> fun.
[22:25] <n900evil> cheap high res digital accels would be good too.
[22:26] <Laurenceb> I2C as well, so everything on one bus
[22:26] <n900evil> yeah
[22:27] <n900evil> i2c camera that reported brightness centroids would be awesome.
[22:27] <Laurenceb> I was looking at making a "uber autopilot board"
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[22:28] <Laurenceb> ST accel + HMC5843 magno + that gyro IC + ARM + CC1020 + ublox6 in QFN + SC1000 barometric pressure + sensortechnics diff pressure sensor for pitot tube
[22:29] <Laurenceb> then a bit of GPIO/SPI ect broken out and maybe a micro SD slot
[22:29] <Laurenceb> doable for $300
[22:29] <n900evil> and teeny!
[22:29] <Laurenceb> $150 without the pressure sensors
[22:30] <Laurenceb> 25*30mm
[22:30] <Laurenceb> decent pressure sensors cost a _lot_
[22:30] <n900evil> yeah
[22:31] <Laurenceb> not sure what would be best - two SCP1000 sensors or one and a sensortechnics diff sensor
[22:31] <Laurenceb> its about the same cost and performance for both options
[22:32] <Laurenceb> annoyingly theres no pressure sensors good enough to give good performance at <10m/s
[22:32] <Laurenceb> you have to use hot wire
[22:34] <Laurenceb> the only tricky bits to source is the ublox6 and gyro
[22:35] <Laurenceb> the QFN ublox5 is also a pain to get - you need an NDA, but you could desolder one from a Falcom FSA5
[22:45] <n900evil> umm
[22:45] <n900evil> venus?
[22:46] <Laurenceb> apparently its very poor
[22:46] <Laurenceb> from my experience the ublox5 is pretty hard to beat
[22:46] <n900evil> in whatever way?
[22:46] <Laurenceb> ublox4 was already pretty much the best
[22:46] <n900evil> yea.
[22:47] <Laurenceb> latency, update rate, sensitivity, documentation, lack of glitches, EMI resisitance
[22:47] <Laurenceb> ublox is the best from all those points of view
[22:48] <Laurenceb> oh and works up to 150Km altitude
[22:48] <n900evil> that's a biggie.
[22:48] <Laurenceb> lassen iq maybe uses less power and sirf3 is slightly more sensitive
[22:49] <Laurenceb> but its about the best gps for non silly money
[22:50] <Laurenceb> ublox6 they reduced power consumption a lot and added a raw sampling mode for geotagging on cameras
[22:51] <Laurenceb> but its sampling only atm
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[23:01] <Laurenceb> I was contemplating a Metropolis-Hastings algorythm approach to bias and sensitivity calculation with an IMU
[23:03] <Laurenceb> try and optimise the bias and sensitivty to get the sensors to be as constitent with one another as possible in the kalman filter
[23:03] <Laurenceb> but as with all these things, needs to be tested with real world data ... roll on free day
[23:07] <SpeedEvil> :)
[23:10] <juxta> evening all
[23:53] <Laurenceb> its similar to how xbow do it, if slightly simpler
[00:00] --- Sun Dec 27 2009