FreeFlyerStkComparison

This wiki page contains the comparison results of Free Flyer and STK. Created: 23 August 2005 Last Updated: 23 August 2005

FreeFlyer?/STK Comparison

1.0 ISS Test Case

Case Number
Description
Position Error (m)
Velocity Error (m/s)
Test File Name
True File Name

1
2-body
0.000838
0.000809
FreeFlyer?_ISS_Earth_0_0_0.txt
STK_ISS_Earth_0_0_0.txt

2
2-body+Moon
0.000996
0.000815
FreeFlyer?_ISS_EarthLuna_0_0_0.txt
STK_ISS_EarthLuna_0_0_0.txt

3
2-body+Sun
0.000826
0.000838
FreeFlyer?_ISS_EarthSun_0_0_0.txt
STK_ISS_EarthSun_0_0_0.txt

4
2-body+HP
5.495822
0.006752
FreeFlyer?_ISS_Earth_0_HP_0.txt
STK_ISS_Earth_0_HP_0.txt

5
2-body+SRP
0.136046
0.000885
FreeFlyer?_ISS_Earth_0_0_SRP.txt
STK_ISS_Earth_0_0_SRP.txt

6
JGM2
0.836881
0.001576
FreeFlyer?_ISS_Earth_JGM2_0_0.txt
STK_ISS_Earth_JGM2_0_0.txt

7
ALL/JGM2/HP
5.441043
0.006492
FreeFlyer?_ISS_EarthSunLuna_JGM2_HP_SRP.txt
STK_ISS_EarthSunLuna_JGM2_HP_SRP.txt

2.0 Sun-Sync Test Case

Case Number
OD File Name
Description
Position Error (m)
Velocity Error (m/s)

8
2-body
0.000824
0.000804
FreeFlyer?_SunSync_Earth_0_0_0.txt
STK_SunSync_Earth_0_0_0.txt

9
2-body+Moon
0.000933
0.000830
FreeFlyer?_SunSync_EarthLuna_0_0_0.txt
STK_SunSync_EarthLuna_0_0_0.txt

10
2-body+Sun
0.000814
0.000818
FreeFlyer?_SunSync_EarthSun_0_0_0.txt
STK_SunSync_EarthSun_0_0_0.txt

11
2-body+HP
1.770659
0.002614
FreeFlyer?_SunSync_Earth_0_HP_0.txt
STK_SunSync_Earth_0_HP_0.txt

12
2-body+SRP
0.091105
0.000831
FreeFlyer?_SunSync_Earth_0_0_SRP.txt
STK_SunSync_Earth_0_0_SRP.txt

13
JGM2
0.373797
0.001113
FreeFlyer?_SunSync_Earth_JGM2_0_0.txt
STK_SunSync_Earth_JGM2_0_0.txt

14
ALL/JGM2/HP
1.706217
0.002584
FreeFlyer?_SunSync_EarthSunLuna_JGM2_HP_SRP.txt
STK_SunSync_EarthSunLuna_JGM2_HP_SRP.txt

3.0 GPS Test Case

Case Number
Description
Position Error (m)
Velocity Error (m/s)
Test File Name
True File Name

15
2-body
0.000798
0.000831
FreeFlyer?_GPS_Earth_0_0_0.txt
STK_GPS_Earth_0_0_0.txt

16
2-body+Moon
0.032978
0.000848
FreeFlyer?_GPS_EarthLuna_0_0_0.txt
STK_GPS_EarthLuna_0_0_0.txt

17
2-body+Sun
0.001215
0.000799
FreeFlyer?_GPS_EarthSun_0_0_0.txt
STK_GPS_EarthSun_0_0_0.txt

18
2-body+HP
0.000798
0.000831
FreeFlyer?_GPS_Earth_0_HP_0.txt
STK_GPS_Earth_0_HP_0.txt

19
2-body+SRP
0.725105
0.000875
FreeFlyer?_GPS_Earth_0_0_SRP.txt
STK_GPS_Earth_0_0_SRP.txt

20
JGM2
0.020762
0.000812
FreeFlyer?_GPS_Earth_JGM2_0_0.txt
STK_GPS_Earth_JGM2_0_0.txt

21
ALL/JGM2/HP
0.522840
0.000855
FreeFlyer?_GPS_EarthSunLuna_JGM2_HP_SRP.txt
STK_GPS_EarthSunLuna_JGM2_HP_SRP.txt

4.0 Molniya Test Case

Case Number
Description
Position Error (m)
Velocity Error (m/s)
Test File Name
True File Name

22
2-body
0.000823
0.000000
FreeFlyer?_Molniya_Earth_0_0_0.txt
STK_Molniya_Earth_0_0_0.txt

23
2-body+Moon
0.081797
0.000000
FreeFlyer?_Molniya_EarthLuna_0_0_0.txt
STK_Molniya_EarthLuna_0_0_0.txt

24
2-body+Sun
0.031286
0.000000
FreeFlyer?_Molniya_EarthSun_0_0_0.txt
STK_Molniya_EarthSun_0_0_0.txt

25
2-body+HP
15.189156
0.000000
FreeFlyer?_Molniya_Earth_0_HP_0.txt
STK_Molniya_Earth_0_HP_0.txt

26
2-body+SRP
2.134218
0.000000
FreeFlyer?_Molniya_Earth_0_0_SRP.txt
STK_Molniya_Earth_0_0_SRP.txt

27
JGM2
2.302172
0.000000
FreeFlyer?_Molniya_Earth_JGM2_0_0.txt
STK_Molniya_Earth_JGM2_0_0.txt

28
ALL/JGM2/HP
12.979493
0.000000
FreeFlyer?_Molniya_EarthSunLuna_JGM2_HP_SRP.txt
STK_Molniya_EarthSunLuna_JGM2_HP_SRP.txt

5.0 GEO Test Case

Case Number
Description
Position Error (m)
Velocity Error (m/s)
Test File Name
True File Name

29
2-body
0.000699
0.000702
FreeFlyer?_GEO_Earth_0_0_0.txt
STK_GEO_Earth_0_0_0.txt

30
2-body+Moon
0.079889
0.000813
FreeFlyer?_GEO_EarthLuna_0_0_0.txt
STK_GEO_EarthLuna_0_0_0.txt

31
2-body+Sun
0.052303
0.000805
FreeFlyer?_GEO_EarthSun_0_0_0.txt
STK_GEO_EarthSun_0_0_0.txt

32
2-body+HP
0.000699
0.000702
FreeFlyer?_GEO_Earth_0_HP_0.txt
STK_GEO_Earth_0_HP_0.txt

33
2-body+SRP
2.898509
0.000870
FreeFlyer?_GEO_Earth_0_0_SRP.txt
STK_GEO_Earth_0_0_SRP.txt

34
JGM2
1.654468
0.000833
FreeFlyer?_GEO_Earth_JGM2_0_0.txt
STK_GEO_Earth_JGM2_0_0.txt

35
ALL/JGM2/HP
3.412994
0.000897
FreeFlyer?_GEO_EarthSunLuna_JGM2_HP_SRP.txt
STK_GEO_EarthSunLuna_JGM2_HP_SRP.txt

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