Aircraft navigation and surveillance analysis for a spherical earth

Abstract

This memorandum addresses a fundamental function in surveillance and navigation analysis —\nquantifying the geometry of two or more locations relative to each other and to a spherical earth. Here, “geometry” refers to: (a) points (idealized locations); (b) paths between points; and (c) distances and angles that quantify paths. Points represent locations of either vehicles or navigation/surveillance sensors. Paths constitute trajectories followed by vehicles or sensor signals. Distances are the lengths of paths/trajectories that are either straight lines or follow the earth’s surface. Angles between paths may be measured on a plane or a spherical surface.\n

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