Accession Number:

AD1029889

Title:

Microwave Photonic Architecture for Direction Finding of LPI Emitters: Post-Processing for Angle of Arrival Estimation

Descriptive Note:

Technical Report

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA MONTEREY

Personal Author(s):

Report Date:

2016-09-01

Pagination or Media Count:

91.0

Abstract:

Direction finding DF systems are fundamental electronic support measures for electronic warfare. A number of DF techniques have been developed over the years however, these systems are limited in bandwidth and resolution and suffer from a complex design for frequency down-conversion. An innovative design of a microwave-photonic direction finding technique for the detection and direction finding of low probability of intercept LPI signals is investigated in this thesis. Key advantages of this design include a small baseline, wide bandwidth, high resolution, and minimal space, weight, and power requirement. A unique phase encoding method is used to resolve the ambiguities over the entire field-of view with high accuracy. Experimental tests using frequency-modulated continuous wave FMCW and continuous wave CW P4 modulated signals were conducted in an anechoic chamber to verify the system design. Test results showed that the microwave-photonic DF system has a sensitivity of -62.96 dBm and is capable of measuring the angle-of-arrival AOA of the LPI signals with 1 degree resolution over a 180 degrees field of-view. For an FMCW signal, it was demonstrated that the system is capable of estimating the AOA with a root-mean-square RMS error of 0.29 degree at 1 degree resolution. For a P4 coded signal, the RMS error in estimating the AOA is 0.32 degree at 1 degree resolution.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE