"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?…"
"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…"
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."
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."
"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…"
"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…"
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…