Accession Number:

ADD018267

Title:

Direction Finding Apparatus Using Tunable Fiber Optic Delay Line.

Descriptive Note:

Patent, Filed 23 Feb 95, patented 25 Jun 96,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1996-06-25

Pagination or Media Count:

8.0

Abstract:

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.

Subject Categories:

  • Direction Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE