Radiation scanning of large area of earth's surface - using sharply focussed aerial beam and tracing on surface circle with continuous forward motion

摘要

The surface of the earth is scanned by an aircraft of space craft. The scanning system uses a sharply focussing aerial whose beam illuminations on the surface circles with dia. (d). The aerial beam is continuously moved on a conical path, so that the surface is scanned along a meandering cycloid, i. e an approx. circle shape linearly moved forward at the craft speed. The aerial beam width, the rotation period (To) and craft speed (v) satisfy the equation d = vTo.