Precise Orbit Determination of Global Navigation Satellite System of ...

Chapter 9 Software and Simulation Results
Figure 9-17 PDOP of the Orbit Determination of an IGSO Satellite Located at λ= -10°
The accuracies of x, y, z coordinates of dynamic orbit determination of an IGSO satellite located at λ=60° are
±0.54, ±0.41 and ±0.33 meters respectively. The accuracies of an IGSO satellite located at λ= -10° are ±0.78,
±1.84 and ±1.42 meters respectively.
The figures above show the possible accuracy of dynamic orbit determination of IGSO satellites using 8 ESA
ground tracking stations. Using Kalman filter and range observations with one meter error, 1 m accuracy of
dynamic orbit determination of IGSO satellites can be achieved. If other conditions are the same as above,
considering unmodeled errors in the satellite dynamic models, propagation and some unknown errors, the
accuracy of IGSO satellite better than ±3 meters can be achieved without difficulty.
The accuracies of GEO satellites are shown in Figure 9-18 to Figure 9-20
Difference (meter)
10
8
6
4
2
0
-2
-4
-6
-8
-10
0 24 48 72 96 120 144 168 192 216 240
Tim e (hour)
Figure 9-18 Accuracy of Orbit Determination of a GEO Satellite Located at λ=-10°
121
dx
dy
dz