I.OE-09 ,...-------------,
8.0E-IO
«I
~ 6.0E-IO
Vi
c 4.0E-IO
o
.~ 2.0E-IO
.;;
o O.OE+OO
~ -2.0E-IO
o
~ -4.0E-IO
...
...,
-6.0E- IO
---Actual
- - - Effective
- - - Estimated
-8.0E-J 0 l....-_-'--_ _ _ ----"_ - - - l
o
3
6
9
12
Months Past I January 1986
I.OE-09 . . . . . - - - - - - - - - - ,
~ 8.0E-IO
'"
.~ 6.0E-IO
en
g 4.0E-10
';::l
·S 2.0E- 10
o O.OE+OO
v
"8 -2 .0E-1O
~
.... -4.0E-IO
....
---Actual
-6.0E-IO
- - - Effective
- - - Estimated
-8.0E-IO L-_ _ _ _ _ _ _ _ .....l
o
3
6
9
12
Month Past 1 January 1986
Figure 5. True effective J 2 and estimated J2 using (a) boxcars and (b) process noise.
] 4.0E-10
0.0
~ 2.0E-IO
o
:~ O.OE+OO
~
~ -2.0E- IO
"8
~ -4.0E-1O
...::: -6.0E-10
-8.0E-1O '--_ _ _ _ _ _ _ -'(~a)~
o
3
6
9
12
Months Past 1 January 1986
6.0E-1 0 .------====A~;)I
I
Actual
_ 4.0E-IO
' "
c
OIl
Vi 2.0E-IO
c
o
';; O.OE+OO
.;;
8-2.0E-10
"0
"8-4.0E-10
~
"':::-6.0E-IO
-8.0E- 1 0 L -_ _ _ _ _ ----"~(b=..!.)....J
o
3
6
9
12
Months Past I January 1986
Figure 6. True effectiveJ 3 and estimatedJ 3 using (a) boxcars and (b) process noise.
30 , . . . - - - - - - - - - -__ --,
(a)
E25
.2"*l 20
::>
-0
~ 15
c
o
:tjlO
o
~
-0
~ 5
RMS =7.82
o ~---~-~--~~~
o
3
6
9
12
Months Past I January 1986
30 , - - - - - - - - - - - - - - ,
(b)
E25
~
~ 20
::>
-c
~ 15
c
o
';::l
'v; IO
d:.
-c
~ 5
o
RMS = 1.27
3
6
9
12
Months Past 1 January 1986
Figure 7. 3-d orbit error using (a) boxcars and (b) process noise.
171