Start time (UTC):      1 January 1996 00:00:00

  - CARTWHEEL, 50/100 KM
  - POLAR, 32/503 REPEAT WITH 4 & 7-DAY sub-CYCLES

Inertial rectangular coordinates and osculating Keplerian elements:

positions and velocities are in METERS and METERS/SECOND, while the Keplerian elements are:
   A              E               I          RA ASC NODE       ARG PERIGEE    MEAN ANOMALY
   (METERS)                      (DEGREES)       (DEGREES)        (DEGREES)      (DEGREES)

 SAT1 X,Y,Z POSITION       0.67022539842682e+07   0.56594532247310e+03   -.58608155262552e+05
 SAT1 X,Y,Z VELOCITY       0.33639586492871e+02   0.50033587898675e+00   0.77232364082366e+04
 KEPLER 6722766.7006  0.005323470482    89.996309419     0.004870344    55.278685747   304.723590357

 SAT2 X,Y,Z POSITION       0.67222683278592e+07   0.57639472969745e+03   0.31816403469237e+05
 SAT2 X,Y,Z VELOCITY       -.18323805570640e+02   0.49438231960953e+00   0.77005034067512e+04
 KEPLER 6722709.4379  0.002354030405    89.996309899     0.004895253   271.460789244    88.540709001

Simulation duration: 3283260 s (38 days + 60 s)
Printing time interval: 3196800 s (37 days + 60 s)
Final printing time interval (after "post-facto"): 3196800 s (37 days)
Static gravity field degree: 50

The simulation starts with the date specified above, but the printing starts 1 day later (86400 s later) to exclude the transient effects of attitude and pointing control.

Formation control and drag free control were disabled.
Attitude control and pointing control were active.
Atmospheric drag force and solar radiation force acting on the satellites were disabled.

The accelerometer noises were active. The effects of misalignment, coupling and scale factors were disabled.

The variables of some files have been filtered to remove the aliasing introduced by the undersampling when printing at 1 Hz.
The filter used is a 7th-order Butterworth filter working at 10 Hz with a cutoff frequency of 0.2 Hz.

Files starting with "cartwheel_polar_37days_file3..." contain the true quaternion values, the reconstituted attitude measurements, the reconstituted angular velocities and the reconstituted angular accelerations obtained with the "post-facto" module, which performs a "data fusion" between star tracker measurements and accelerometer measurements. The first and the last 30 points have been removed to exclude border effects caused by the inverse filter used for the rephasing of the signal. The other files have been trimmed accordingly.

The output files (ASCII format) are:
- cartwheel_polar_37days_file1.dat (filtered variables)
- cartwheel_polar_37days_file2a_1.dat (filtered variables)
- cartwheel_polar_37days_file2a_2.dat (filtered variables)
- cartwheel_polar_37days_file2b_1.dat (filtered variables)
- cartwheel_polar_37days_file2b_2.dat (filtered variables)
- cartwheel_polar_37days_file3_1_ECF.dat
- cartwheel_polar_37days_file3_1_ECI.dat
- cartwheel_polar_37days_file3_2_ECF.dat
- cartwheel_polar_37days_file3_2_ECI.dat
- cartwheel_polar_37days_file4_1.dat
- cartwheel_polar_37days_file4_2.dat

The name of the variables are specified in the files:
- Hcartwheel_polar_37days_file1.dat
- Hcartwheel_polar_37days_file2a_1.dat
- Hcartwheel_polar_37days_file2a_2.dat
- Hcartwheel_polar_37days_file2b_1.dat
- Hcartwheel_polar_37days_file2b_2.dat
- Hcartwheel_polar_37days_file3_1_ECF.dat
- Hcartwheel_polar_37days_file3_1_ECI.dat
- Hcartwheel_polar_37days_file3_2_ECF.dat
- Hcartwheel_polar_37days_file3_2_ECI.dat
- Hcartwheel_polar_37days_file4_1.dat
- Hcartwheel_polar_37days_file4_2.dat

The files are inside the compressed archive "cartwheel_polar_37days_23072010.tgz". To extract the files use the following command:
	$ tar -xzf cartwheel_polar_37days_23072010.tgz

Date: 23/07/2010