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anthrax replied to Caleb Chamberlain's discussion Best setup and pinout for 6-DOF IMU
"just take a look at Invensense website and find out they introduce new IMU 6-dof name IHU-500 and IHU-650
This sounds great in 7x7mm package but not sure when they will release it to market. Any idea about this product?…"
Oct 7, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"hi Caleb, it's alright for me to understand linear algebra, I'm waiting for your tutorial of KF and fixed gain observer :)
@Tom Yochum : I did develovep Kalman filter before for my quadrocopter project to track bias of gyro and get pretty accuracy…"
Oct 6, 2009
anthrax commented on Gary Mortimer's blog post 2.4 Xbee in a box
"Hi Gary
I'm curious what kind of Xbee you are using, 50mW type or 10mW type? 900Mhz or 2.4Ghz?
I think what you mention about third Xbee is possible. Using third Xbee as a repeater, hopefully we can double the range."
Oct 6, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"Tom Kent,
Your idea about creating our own DGPS base station sounds great.I have Xbee for 2 ways data down link already . Its easy to send correction data back to the air .You should start an entry for that stuff."
Oct 6, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"hi Tom , DGPS is not a easy way in my location , there is no available base station for free."
Oct 5, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"hi Jordi, thanks for your advise , I found some guys use pressure sensor for altitude hold and combine with accelerometer to use in GPS position hold with great result (while altitude hold mode active)
hi Caleb, regarding fixed-gain obsever you…"
Oct 4, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"hi Jordi, I did think of Kalman filter but still not so clear how to implement a kalman fusion for gps and IMU to my microcontroller.BTW i know that kind of optical flow using in Helicommand module."
Oct 3, 2009
anthrax commented on anthrax's blog post Need help: GPS position hold algorithm?
"hi Jason, By using relationships between position vs velocity, and velocity vs acceleration, we can estimated displacement in position (dX, dY, dZ) using accelerometer input value. However the error is drift over time, it should be use in shorterm…"
Oct 3, 2009
anthrax posted a blog post
Hi all,I'm just wondering how can we perform a position hold (within 10-20 cm, just like microdrone MD4-200 did ) with a GPS and IMU because I know that the accuracy of normal GPS is aroung 2m and can not achieve up to few cm level if we dont have…
Oct 3, 2009