Parameter adjustment magnitudes Already discussed satellite orbital motion Parameterized as initial conditions(C)at specific time and radiation model parameters For pseudo range positioning, broadcast ephemeris is often adequate. Post-processed orbits(GS)+3-5 cm (may not be adequate for global phase processing) Satellites orbits are easiest integrated in inertial space, but receiver coordinates are nearly constant in an Earth-fixed frame Transformation between the two systems is through the earth orientation parameters(EOP). Discussed in Lecture 4 04/17/02 12.540Lec1804/17/02 12.540 Lec 18 6 Parameter adjustment magnitudes • Already discussed satellite orbital motion: Parameterized as initial conditions (IC) at specific time and radiation model parameters. • For pseudo range positioning, broadcast ephemeris is often adequate. Post-processed orbits (IGS) ±3-5 cm (may not be adequate for global phase processing). • Satellites orbits are easiest integrated in inertial space, but receiver coordinates are nearly constant in an Earth-fixed frame. • Transformation between the two systems is through the Earth orientation parameters (EOP). Discussed in Lecture 4