Patent Number: 6,298,313

Title: Passive ranging using inferior mirages

Abstract: A method, and a system responsive thereto, is disclosed for determining the height and range of targets, particularly low altitude targets. The method depends upon the occurrence of a sub-refractive atmosphere causing an inferior mirage image which is utilized along with the real image in a ray tracing technique with the cross-over points yielded therefrom being indicative of the height and range of the target being detected.

Inventors: Trahan; Joseph W. (Fredericksburg, VA)

Assignee: The United States of America as represented by the Secretary of the Navy

International Classification: G01C 3/08 (20060101); G01B 011/22 (); G01B 013/14 (); G01B 021/18 ()

Expiration Date: 10/02/2018