Disturbing Accelerations Moons Refle Solar radiation Gravity I Pressure Disturbing 電 Principles of the Global Positioning System 2005311(21 Disturbing Accelerations e For gPs satellites altitude is about 20200 km the indirect effect of solar radiation pressure and air drag may be neglecte The shape of the satellites is irregular which renders the modeling of direct solar radiation pressure more difficult. Different Satellites are different radiation pressures The variety of materials used for the satellites has a different heat-absorption which results in additional and complicated perturbing accelerations o Accelerations may arise from gas leaks in the container of the gas-propellant Principles of the Global Positioning System 2005-3-11(22) 1111 Principles of the Global Positioning System 2005-3-11 21 Disturbing Accelerations Principles of the Global Positioning System 2005-3-11 22 Disturbing Accelerations z For GPS satellites, altitude is about 20200 km, the indirect effect of solar radiation pressure and air drag may be neglected. z The shape of the satellites is irregular which renders the modeling of direct solar radiation pressure more difficult. Different Satellites are different radiation pressures z The variety of materials used for the satellites has a different heat-absorption which results in additional and complicated perturbing accelerations. z Accelerations may arise from gas leaks in the container of the gas-propellant