The GPS interface Control Document is a government document that contains the full technical description of the interface between the satellites and the user. The ability of a system to provide timely warnings to user when the system should not be used for navigation as a result of errors or failures in the system. IMO International Maritime Organization Inmarsat International Maritime Satellite. The band of charged particles 80 to 120 miles above the earths surface, which represent a non-homogeneous and dispersive medium for radio signals. A wave propagating through the ionosphere experiences delay.
Phase delay depends on electron content and affects carrier signals.
The phase and group delays are of the same magnitude but opposite sign. The change in the propagation speed of a signal as it passes through the ionosphere. A receiver containing multiple independent channels, each of which tracks one satellite continuously, so that position solutions are derived from simultaneous calculations of pseudoranges. Multipath Interference caused by reflected GPS signals arriving at the receiver, typically as a result of nearby structures or other reflective surfaces. One billionth of a second.