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This contribution deals with the direction of arrival estimation of narrowband signals using an antenna array. Under sparsity constraints the estimation procedure is based on compressed sensing by altering the array factor of the antenna. This approach allows to influence directly the incoherence requirement of the sensing matrix. Simulation results are provided to present the performance of the proposed...
For downward-looking linear array three-dimensional SAR, the resolution in cross-track direction is a curial problem. Hence, compressive sensing algorithm has been used to acquire the superresolution performance in cross-track direction. The limits of the proposed algorithm are investigated in this paper. How accurately can the scattering intensity of the scatterers be estimated? What is the closest...
A major design factor for an accurate and successful DOA estimation in smart antenna systems is the appropriate choice of the antenna array configuration. This paper proposes a new array configuration called Uniform Circular Displaced Antenna Array (UC-DAA), which is especially useful for detecting coherent signals encountered in multipath environments. The proposed configuration is composed of two...
Gain and phase errors calibration of sensor array plays an important role in practical applications. In this paper, an approach to sensor gains and phases estimation is proposed in the presence of multipath propagation. First, spatial spectrum of multipath signals is constructed based on the singular value decomposition of data covariance matrix. Then, direction-of-arrival (DOA) of the non-line-of-sight...
The sidelobe canceller (SLC) is widely used for the array processing to suppress interferences located in the sidelobe of the radiation pattern. In the presence of steering vector mismatch, the performance of SLC may suffer from severe degradation due to desired components cancellation. In this paper, a modified approach is developed to improve the robustness against the direction of arrival (DOA)...
The frequency smoothing technique makes the coherent signal subspace method (CSSM) capable of resolving the wideband coherent sources. However, when time delay between coherent signals becomes short, its performance deteriorates. To fix this, we propose a novel method based on the sparse representation. After averaging the focused array covariance matrices at different frequencies, we construct the...
In this paper, a robust widely linear adaptive beamformer is proposed for noncircular signals, which is able to efficiently reconstruct the interference-plus-noise covariance matrix (IN-CM) and estimate the extended steering vector. Estimation of the covariance matrix is based on the minimum variance distortionless response (MVDR) spatial spectrum integrated over a region which excludes the direction...
This paper suggests the study for the process of planning and capturing the optimal trajectory by the mobile robot in order to efficiently capture mobile sound sources. The sound sources are released and moved by using the mobile robot. The mobile robot is equipped with a microphone array, which makes it possible to obtain the location and direction of the mobile sound sources. For the capturing process,...
This work proposes a systematic algorithm to build up a spacing-constrained non-uniform linear array (NLA) configuration. Obtainable DoF due to the proposed algorithm can have much better performance than existing NLA configurations. By further applying spatial smoothing and array interpolation techniques, performance indices, such as number of incident signal (NIS) detection and direction of arrival...
Interpolation array approach based on Taylor series fitting for arbitrary geometry array is developed in this paper. As the steering vector is a function of direction-of-arrival (DOA), Taylor series fitting for the steering vector is conducted within an angle range, and the steering matrix is decomposed into a coefficient matrix multiplying by a Vandermonde structure vector bearing the DOA information...
Polarization diversity of conformal antenna arrays introduces uncertainty to the determination of array manifold needed for passive direction finding. Most of the previous research on direction of arrival (DOA) estimation for arrays with diversely polarized elements focused on the algorithms to estimate both the directions and polarizations of the incident waves[1][2][3]. In many applications however,...
Joint spectrum sensing and direction of arrival (DOA) estimation is often necessary in communication applications, such as Cognitive Radio (CR). In this paper, we consider joint DOA and carrier frequency recovery of several transmissions as well as signal reconstruction from sub-Nyquist samples to overcome the sampling rate bottleneck of the wideband signals a CR typically deals with. We present two...
In this paper, basics of Direction of Arrival (DOA) estimation techniques were reviewed along with simulated results. It justifies the pros and cons of each technique. The purposes of using smart antenna system in this paper are regarded with the respect of DOA estimation, Path Delays estimation, and accurate channel estimation between a transmitter and an array of receivers. Considering the uplink...
In this paper, a direction-of-arrival (DoA) estimation method based on compressive sensing is proposed for an electronically steerable parasitic array radiator (ESPAR) antenna, which uses only a single radio frequency (RF) chain, and is thereby suited for application in compact wireless terminals. Unlike a conventional multi-active antenna array, signals impinging on parasitic elements in an ESPAR...
In this paper a direct method to estimate maximum power points (MPPs) in PV arrays subjected to mismatching conditions is presented. The method uses the lossless single-diode model (SDM) which is parameterized using the data of inflection and maximum power points of each panel. The reconstruction of power vs. voltage curve is obtained by one explicit equation, thus avoiding the use of recursive non-linear...
In this paper, we propose a real-valued ESPRIT algorithm for two-dimensional direction of arrival (2D DOA) estimation of noncircular signals using arbitrarily spaced acoustic vector sensor array. By utilizing the noncircularity of the signals, the proposed algorithm provides a better estimation performance while having only slightly larger computational complexity as compared to the traditional complex...
This paper shows an implementation of a Radio Direction Finding prototype using three AoA algorithms and MIMO synchronization over a SDR platform, with a non-calibrated two element array. This algorithms were tested in three scenarios with different type of transmitted signals including baseband AM and FM sinusoidal tone and an AM modulated voice signal. The angle was estimated with a mean error below...
This paper introduces a Sensor Array System for the 3D capture and representation of users' limb and body movements. It also develops a design and implementation of a Wireless Inertial Measurement Unit (IMU) Sensor Array. By placing sensors on one's arm, hand, upper leg and lower leg, data needed by the application developers to represent the body pose of the user in a virtual environment is provided...
This paper proposes a mean shift based method of blind source separation as well as source direction estimation through time-frequency (T-F) decomposition. The basic cue of T-F cell adopted here is the wave propagation vector and the method is applicable to arbitrary array configuration in 3-D space. In addition, it also applicable to wide extent array, thus the method cope with spatial aliasing problem...
We present a maneuverable antenna array that adapts to the interfering environment of the wireless base station. It delivers best estimates of the directions of the system users, an information of the utmost importance to the so-called smart base stations. Closed-form expressions are provided that determine the shape of the optimum antenna array. In the worst case scenario, when the system user may...
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