Physical Fundamentals GPs signal propagation from the satellite to the user by means of electromagnetic waves. Such waves are generated by an oscillating (alternating) electric force The field strength decreases with increasing distance from the transmitting source The propagation conforms Maxwell's laws &e Principles of the Global Positioning System 20053-18(3 Physical Fundamentals ottp Aesin(at+(po) Principles of the Global Positioning System 2005-3-18(42 Principles of the Global Positioning System 2005-3-18 3 Physical Fundamentals Principles of the Global Positioning System 2005-3-18 4 Physical Fundamentals ϕ0 ωt+ϕ0 t0 t1 y=Aesin(ωt+ ϕ0) Ae