Flight control system for flying object

A flight control system for a flying object, comprising a flying object, a navigating means provided in said flying object, a position measuring unit, a flight control unit for controlling said navigating means, and a main arithmetic control unit for controlling said position measuring unit and said flight control unit,

• wherein said position measuring unit has a GPS device for measuring a ground coordinate of said flying object, a vertical camera for taking a digital image below said flying object, and a tilting mechanism for tilting said vertical camera, wherein said tilting mechanism tilts said vertical camera in such a manner that an optical axis of said vertical camera becomes vertical to a tilted plane when said flying object flies above said tilted plane, wherein said vertical camera takes an image from a first point and a ground coordinate of said first point is measured using said GPS device, said flying object then moves from a said first point to a second point, said vertical camera takes an image from said second point and a ground coordinate of said second point is measured using said GPS device, and said main arithmetic control unit measures an altitude of said flying object based on images taken at said first point and said second point, on ground coordinates of said two points, and on a focal length of said vertical camera, and wherein said main arithmetic control unit controls said navigating means via said flight control unit based on said measured altitude and makes said flying object fly at a predetermined altitude.