The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, joint frequency and 2-D direction of arrival (DOA) estimation at sub-Nyquist sampling rates of a multi-band signal (MBS) comprising of P disjoint narrowband signals is considered. Beginning with a standard uniform rectangular array (URA) consisting of M = Mx × My sensors, this paper proposes a simpler modification by adding a N — 1 delay channel network to only one of the sensor. A...
Time-frequency techniques have difficulties in yielding efficient online algorithms for almost periodic signals. We describe a new topological method to find the period of signals that have an almost periodic waveform. Proposed method is applied to signals received from a pyro-electric infrared sensor array for the online estimation of the respiratory rate (RR) of a person. Time-varying analog signals...
In this paper, two novel channel parameter estimation algorithms are proposed under the "wideband assumption" (WBA), where a wavefront varies significantly when traversing through the sensors of an array. The first is a covariance-based algorithm that utilizes the cross-covariance matrix between two subvectors of the received signal vector and its singular value decomposition to reconstruct...
Joint frequency and DOA estimation of more sources than the number of sensors is considered in this paper. We assume a simple uniform linear array (ULA) and propose to employ a multiple delay channel network at every sensor, which can easily be realized by sampling at a slightly higher rate. By combining the outputs of the ULA and the delay network, we show that the manifold matrix is analogous to...
In this paper, we consider joint estimation of the Direction-of-arrival (DOA) and channel parameters of fully correlated sources impinging on a linear array sensors in Underwater multipath environment. Amindavar et al.[1] proposed a blind techniques for simultaneous estimation of the DOA and the channel parameters based on the assumption that the source signal can be modeled by a sum of weighted complex...
A new method is proposed for the source location with distributed sensor array. Firstly, the direction of arrival (DOA) of each subarray is estimated by the Multiple Signal Classification (MUSIC) group delay function. Secondly, the initial rectangular region is established from the DOA estimation. Finally, the regional contraction is performed based on the larger steered response power. The centroid...
A local series expansion of a received signal is proposed for computing direction of arrival (DOA) in sensor arrays. The advantages compared to classical DOA estimation methods include general sensor configurations, ultra-slow sampling, small dimension of the arrays, and that it applies for both narrowband and wideband signals without prior knowledge of the signals. This makes the method well suited...
In this work, we improve the capability of spatial event localization in ad-hoc sensor networks equipped with simple sensor devices, in the context of smart camera networks. In our former work, the Orthogonal Cut approach has been used for that purpose. It is applicable in many different object localization scenarios without cooperation of the object and without much knowledge about the environment...
In this paper, a new form of clustering method is presented where a priori knowledge of the reliability of different samples is used. This knowledge can be inserted into the cluster-finding based computation of the estimator output in the form of sample weights. This kind of method is needed in time-delay based angle of arrival estimation with nonuniform linear sensor arrays.
Based on the introduction of the acoustic and seismic detection technology for the networked ammunitions, a data acquisition system with an input of eight channels for the acoustic and seismic signals is designed for the distributed acoustic and seismic sensor arrays. Programs are made for the spectrum analysis, design of the filter, time delay estimation of the multichannel signals. The acquisition...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.