Three=dimensional radar system using two azimuthal sweeps - applies Pythagoras theorem to calculate altitude of target from measured slant range and horizontal triangle geometry

摘要

Two azimuthal search radars (S1,S2), sepd. by a known distance (A) in a horizontal plane, emit fan-shaped beams (E1,E2) contra-rotating in synchronism. The altitude (H) of a target (F) is calculated by triangulation using the distances (G1,G2) from the two sources (S1,S2) to the point (Z) of intersection of the beams (E1,E2), and the measured range (R) of the target (F) from either source. Positional uncertainties are allowed for when the target is outside the vertical plane of symmetry (M). ADVANTAGE - Locates flying objects by relatively uncomplicated system, having data refresh rate comparable with that of two-dimensional system.