Vallado and Carter showed that highly accurate

orbit determination is possible with dense observation data for 120 s (a few hundred observations per satellite pass) [13].

In the

orbit determination, especially with the kind and quantity of modern data, statistics play an important role nowadays [14].

Li et al., "Comparison analyses on the 150 x 150 lunar gravity field models by gravity/topography admittance, correlation and precision

orbit determination," Advances in Space Research, vol.

Our interest is to understand how sensitive the

orbit determination is to the ocean tides and how precisely the ocean tides should be modeled.

Each least squares

orbit determination run was initialized using the JSpOC TLE, and each came to a convergence with close resemblance to the TLE.

Orbit determination by genetic algoripm and application to GEO observation.

TerraSAR-X precise

orbit determination with real-time GPS ephemerides.

A modellization piece that is often used in precise

orbit determination is given by the socalled empirical accelerations.

Psiaki, "Tests of magnetometer/sun-sensor

orbit determination using flight data," Journal of Guidance, Control, and Dynamics, vol.

Section 2 describes the methodology of GPSR based

orbit determination; Section 3 is a brief introduction of the disturbance mathematical model; Section 4 legends the

orbit determination algorithm description; Section 5 describes the GPS measurement models; description of OP algorithm settings is included in Section 6; and Section 7 offers the conclusion.