发明名称 |
Direction determining method and apparatus |
摘要 |
A direction finding system is disclosed in which a predetermined horizontal plane is established by the projection from one location of an image having illuminated and unilluminated portions corresponding to the predetermined horizontal plane. A receiver at a remote location detects the image at two spaced points and produces an indication of the center of the transition zone between the illuminated and unilluminated portions of the projected image.
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申请公布号 |
US4023908(A) |
申请公布日期 |
1977.05.17 |
申请号 |
US19760648064 |
申请日期 |
1976.01.12 |
申请人 |
SANDERS ASSOCIATES, INC. |
发明人 |
JOHNSON, PHILIP M.;NORTHRUP, RICHARD M. |
分类号 |
G01C15/00;(IPC1-7):G01B11/26 |
主分类号 |
G01C15/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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