Microwave-photonic architecture for direction finding of LPI emitters: post-processing for angle of arrival estimation
Ong, Chee Kiong
Pace, Phillip E.
Jenn, David C.
MetadataShow full item record
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.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Microwave-photonic architecture for direction finding of LPI emitters: front-end analog circuit design and component characterization Tan, Chew K. (Monterey, California: Naval Postgraduate School, 2016-09);Direction finding (DF) systems are critical components in electronic warfare intercept receivers. Many existing radio frequency DF techniques use a non-linear frequency down-conversion process that generates spurious ...
A new high-resolution direction finding architecture using photonics and neural network signal processing for miniature air vehicle applications Humeur, Robert (Monterey, California: Naval Postgraduate School, 2015-09);This paper investigates the design of an interferometric direction finding receiver using photonic components for signal mixing and a multi-layer perceptron for data analysis. The complete system was tested with a 2.4 GHz ...
Hatziathanasiou, Thomas N. (Monterey, California. Naval Postgraduate School, 1998-06-01);A new interferometer direction finding array architecture based on the optimum symmetrical number system (OSNS) is presented. OSNS arrays are capable of unambiguous high-resolution direction finding with as few as three ...