Base Line
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Base Line
1. Any line which serves as the basis for measurement of other lines, as
in a surveying triangulation, measurement of auroral heights, etc.
2. The geodesic
line between two stations operating in conjunction for the determination
of a line of position, as the two stations constituting a loran rate.
3. In radar, the line traced on amplitude-modulated
indicators which corresponds to the power level of the weakest echo
detected by the radar. It is retraced with every pulse transmitted by the
radar, but appears as a nearly continuos display on the scope.
Target signals show up as perpendicular deviations from the base line;
range is measured along the base line; signal strength is indicated by the
magnitude of the deviations; and the type of target usually can be determined
by the appearance of the deviations.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
