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A high accuracy and low complexity estimator for the unknown frequency and direction of arrival (DOA) of a sinusoid incident on a sensor array is proposed. The approach is to extend an existing Fourier coefficient interpolation scheme of Quinn, to a multi-sensor array. Simulation results show a mean square error in frequency of approximately 1.3 times the CRB, while for DOA it is approximately 1.1...
We discuss the application of signal parameter estimators for periodic point process signals with missing data. The proposed estimation techniques operate on the observed event arrival time sequence of a pulse train signal and have application to pulse train signal classification and signal reconstruction. The methods we describe are based on the use of circular statistics and are shown to offer considerable...
Radio frequency (RF) signal intercept systems, such as electronic support (ES) receivers, are inherently wideband by design to provide spectral surveillance over a wide frequency range. To meet both sensitivity and frequency coverage requirements, a digital channelised receiver architecture, such as that proposed in [1], is very attractive. An improved channeliser-synthesiser architecture, which provides...
Angle-of-arrival (AOA) estimation algorithms for electronic surveillance systems are often required to be accurate, computationally fast and implemented using sparse large aperture arrays. This paper considers the speed and accuracy of the SODA and SBI interferometers [1, 2] in the context of sparse large aperture arrays and compares their performance to the conventional phaseshift beamformer and...
Two well known algorithmic techniques for analysing chirp and phase coded signals incorporate a shift-conjugate-multiply and a squaring operation respectively. This paper considers the appropriate generalisation of these techniques to a multi-channel sensor array in order to jointly estimate the direction of arrival of a signal and the signal modulation parameters of interest. The resulting algorithms...
This paper presents two fast and computationally efficient interferometric algorithms that allow high accuracy, unambiguous angle-of-arrival (AOA) estimates to be obtained using physically large wideband antennas that are suitable for electronic surveillance. The performance of the algorithms are compared against conventional interferometric techniques using simulations and are also verified experimentally.
Conventional interferometric techniques used in electronic support (ES) systems are often limited to estimating the angle-of-arrival (AOA) of one narrowband radar signal at any given time. This paper proposes a simple, low-cost extension that enables these systems to estimate the AOA of two simultaneous narrowband radar signals using only two receivers.
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