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The paper considers the problem of how to simultaneously estimate the direction-of-arrival (DOA) of a source signal and the phase error of a uniform linear array (ULA). We introduce a new method to estimate those parameters for a partly calibrated ULA. As its name suggests, partly calibrated ULA means a array with some of its sensor elements have been calibrated. In particular, our method can be well...
Several blind calibration methods have been proposed in a compressive sensing framework to mitigate the detrimental effects of uncertainties in the measurement matrix due to sensor gain and phase errors. Most of these methods operate on the signal domain samples of the receiving elements. This becomes computationally intractable if a large number of time samples is required, for example in low-SNR...
In this paper, I introduce a novel method for blind calibration of dense irregular arrays on an arbitrary scene. This method exploits the fact that in such arrays, several pairs of antennas may sample almost the same spatial frequency. I demonstrate this method using actual data from a single aperture array station of the Low Frequency Array radio telescope. This example showcases the advantages of...
Array self calibration consists of identifying array shape distortions and deviations to gain and phase sensor responses, in an unknown source field. Conditions of local identifiability of these parameters are established, and turn out to depend on the type of array and the type of field. The minimal number of sources and sensors is calculated in each case, and the nature of the remaining degrees...
An effective direction finding method is proposed for conformal array in the presence of array perturbations. Several typical errors such as mutual coupling, gain-phase error and position error are considered at the same time. These errors are as the angularly dependent gain-phase error. To avoid the shadow effect of conformal array, the whole array and airspace is divided into several parts. And...
In this paper, a method that is capable of handling simultaneously gain, phase and location as well as mutual coupling uncertainties is proposed for calibrating a planar array of general geometry. The proposed technique assumes that the array gain and phase errors are non-directional and that three time-disjoint pilot sources are available. The efficiency and the potential benefits of the proposed...
We describe the design and construction of a dual-polarized phased-array feed (PAF) with the purpose of demonstrating this technology as a means of expanding the instantaneous field-of-view of radio telescopes. The PAF beamformer is calibrated with observations of an unpolarized astronomical radio source, the covariance matrix of all receiver channels is calculated, and the two dominant eigenvectors...
A new method for estimating direction of arrival (DOA) of the strong and weak signals is proposed in the presence of array gain and phase mismatch. Firstly, the array gain and phase mismatch is estimated using the norm of the error vector between the practical steering vector and the theoretical vector of the strong signal, and then the data covariance matrix is calibrated. Secondly, the new seek...
When we use the multiple beam antenna to estimate the direction of arrival (DOA) by using the multiple signal classification (MUSIC) algorithm, the uncertainty element's amplitude and phase will effect the DOA estimation performance of the beam antenna. So a universal technique for self-calibration based on the minimize cost function is introduced. By minimize the cost function it can get the array...
Three simple, yet practical calibration criterions are derived for low-angle tracking of array radar. In light of these criterions, real time and blind calibration can be achieved in multipath signal environment based on the preprocessing of the array snapshots or covariance matrix. The measured data on an dasiaoverwaterpsila path is used to verify the effectiveness of the proposed array calibration...
We consider space-time adaptive processing (STAP) when the radar returns are recorded by a conformal antenna array (CAA). The statistics of the secondary data snapshots used to estimate the optimum weight vector are not identically distributed with respect to range, thus preventing the customary STAP processor from achieving its optimum performance. The compensation of the range dependence of the...
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