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A
Positioning mode in which a position is identified with respect to a well-defined coordinate system, commonly a geocentric system (i.e., a system whose point of origin coincides with the center of mass of the earth).
Aircraft
B
The range of frequencies included in a radio signal, usually specified as greater than a given power level (such as a half power level, or –3dB.) It is expressed in Hertz (Hz) with the relative power level at band extremes normally specified.
A baseline consists of the three dimensional vector between a pair of GPS stations. Also, the vector distance between two points.
A base station is a GPS receiver at a known position specifically established to collect differential correction data for other GPS receivers in a given region. Base station data is used to calculate the errors relative to its known position which are provided to other users. The “relative difference” between the base station’s known position and the position calculated from GPS satellite signals become the basis for the corrections provided to other GPS receivers. Corrections can be transmitted in real-time, or used during later post-processing. A base station is also called a reference station.