1.Kalman filter for attitude estimate.
2.900MHz,2W RF datalink.
Although the sensor board not be modified for GPS and airspeed sensor. but I have tested the attitude estime via Kalman filter and RF datalink first. It's sad that I forgot take DV to record it. Orz
The RF made in Taiwan is stable and higher data rate that CL4790.(I have both). But It need specific command to sent data. It is not suitable for general purpose.