发明名称 |
Direction finding apparatus using tunable fiber optic delay line |
摘要 |
A direction finding apparatus and method for an RF signal are described which provide a variable time delay in fiber optic cables. A tunable transmitter launches optical emissions of several wavelengths into a plurality of fiber optic cables. Since the waveguide material of each cable exhibits anomalous dispersion of the optical emissions, large changes in group refractive index are provided as a function of the different wavelengths of the optical emissions. As a consequence, only small changes in the different wavelengths of the optical emissions produce large changes in the time delay of the different wavelengths of the optical emissions within a fixed length of the optical fiber cables. This apparatus and method produce sensitive angle of arrival determinations for RF signals.
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申请公布号 |
US5530778(A) |
申请公布日期 |
1996.06.25 |
申请号 |
US19950395749 |
申请日期 |
1995.02.23 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY |
发明人 |
RAST, HOWARD E. |
分类号 |
G02B6/28;H01Q3/26;(IPC1-7):G02B6/28 |
主分类号 |
G02B6/28 |
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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