Microwave-photonic architecture for direction finding of LPI emitters: post-processing for angle of arrival estimation
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Authors
Ong, Chee Kiong
Subjects
Direction finding
DF
LPI signals
minimum Euclidean distance detection
photonics
Mach Zehnder modulator
MZM
angle of arrival
AOA
DF
LPI signals
minimum Euclidean distance detection
photonics
Mach Zehnder modulator
MZM
angle of arrival
AOA
Advisors
Pace, Phillip E.
Date of Issue
2016-09
Date
Sep-16
Publisher
Monterey, California: Naval Postgraduate School
Language
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° resolution over a 180° 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° at <1° resolution. For a P4 coded signal, the RMS error in estimating the AOA is 0.32° at 1° resolution.
Type
Thesis
Description
Series/Report No
Department
Electrical and Computer Engineering
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Distribution Statement
Approved for public release; distribution is unlimited.
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Copyright is reserved by the copyright owner.