MOVI M5 Jitter Analysis for Cinematography

What exactly is in a MOVI log, and what does it mean?

A MOVI log file is a comma separated (.CSV) filled with data from the internal sensors on the motion stabilization unit.  There are 29 variables in the MOVI log file I looked at. (2015/10).  This is a MOVI holding a RED DRAGON during setup, and during a flight on our Aerial MOB Heavy lifter.  The log-file headers were the following.

Column. Name, unit:

  1. Reading (#)
  2. IMU Time (seconds)
  3. GPS Time (UTC)
  4. Long (degrees * e7)
  5. Lat (degrees * e7)
  6. GPS Alt (m)
  7. East (m)
  8. North (m)
  9. Up (m)
  10. Vel East (m/s)
  11. Val North (m/s)
  12. Val Up (m/s)
  13. Accel East(m/s^2)
  14. Accel North(m/s^2)
  15. Accel Up(m/s^2)
  16. Pitch (deg)
  17. Roll(deg)
  18. Yaw(deg)
  19. Pitch Rate(deg/sec)
  20. Roll Rate(deg/sec)
  21. Yaw Rate(deg/sec)
  22. Radio Pitch (us)
  23. Radio Roll (us)
  24. Radio Yaw (us)
  25. Sats (#)
  26. Hacc(m)
  27. Sacc(m/s)
  28. Voltage(V)
  29. Baro Height(m)
  30. Temperature(degC)

Reading

Reading
#
0
1
2
3
4
5

Reading

This number starts at 0, and increments by one for every row in the file.  It is linear, and in the file I was looking at the data seemed to be at 25 hertz when correlated the IMU time which is given is seconds.

IMU Time (seconds)

IMU Time
s
0
0.006
0.044
0.0841
0.1261
0.1641

IMU Time is given is seconds.  This file shows just under 500 seconds, so around 8 minutes of operation of the MOVI M5.

IMUTime

 

 

GPS Time (UTC)

GPS Time is given in standard time format.

GPS Time
UTC
0:23:06
0:23:06
0:23:06
0:23:06
0:23:07
0:23:07

GPSTime

 

 

 

GPS Lat, Long, GPS Alt

GPS in degrees and altitude from GPS.  It is interesting that the data is empty on most of the data file.

 

 

Positions, East, North, Up

Positions in East, North and Up.  It is interesting that the data is empty on most of the data file.  This must be GPS offset calculated from the above GPS data.Positions

Velocities

Velocities for East, North and Up are given in meters/second.  This must be the calculated first differential of the position.

Velocities

 

Accelerations

Accelerations are in meters per second per second.  Second differential of the position.

MOVI M5 Acceleration Data

 

Roll/Pitch/Yaw

Roll, Pitch and Yaw are given in degrees.  IMU Data for Roll/Pitch/Yaw.

RollPitchYaw

 

 

Rates

Rates are given in degrees per second. First differential of the Pitches

Rates for MOVI M5

 

 

Radio Inputs

Radio inputs in micro seconds.  This is the input from the radio receiver.  In this file, it was hooked up to a Futaba 14.

RadioPitchRollYaw

 

 

 

 

Satellite Health Information

Satellite Health overall

  • Horizontal accuracy in meters
  • I don’t know what Sacc is yet, but I assume its something like Satellite accuracy.
  • Barometer Height

SatelliteData

Voltage

Voltage is given in volts.  There are interesting features in this data.

Voltage

 

Temperature

Temperature is given in degrees celsius.

Temperature