NDLI: Accuracy improvement in amplitude comparison-based passive direction finding systems by adaptive squint selection

Content Provider	IET Digital Library
Author	Iqbal, Muhammad Faisal Khalid, Zubair Zahid, Muhammad Abdullah, Asim
Abstract	The direction of arrival (DOA) is one of the most important parameters measured by electronic warfare systems. Monopulse direction finding techniques based on amplitude comparison have many advantages because of their simplicity but they generally have limited accuracy. There are many sources of error in such a system. This work focuses on improving the noise error. An algorithm is proposed for error reduction in amplitude comparison-based direction finding systems. The algorithm, based on signal level and DOA, adaptively utilises either adjacent or alternate antennas for the DOA measurement. No additional hardware is required for the implementation of this algorithm. A prototype system is developed using spiral antennas and the performance of the proposed technique is compared against traditional ratio-based and correlation-based amplitude comparison schemes. Simulations and laboratory experiments show that the DOA accuracy can be improved by an average of 36 and 21% as compared to the ratio-based and correlation-based methods, respectively.
Starting Page	662
Ending Page	668
Page Count	7
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 5, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2019.0465
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-01-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adaptive Squint Selection Amplitude Comparison-based Passive Direction Finding System Correlation Method Correlation-based Amplitude Comparison Scheme Direction of Arrival Estimation Direction of Arrival Measurement DOA Measurement Electronic Warfare System Monopulse Direction Finding Technique Noise Error Reduction Ratio-based Amplitude Comparison Scheme Signal Processing And Detection Signal Processing Theory Spiral Antenna
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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