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A novel online antenna array calibration method is presented in this paper. Unlike conventional calibration process, the proposed method is a blind approach that does not require prior knowledge of angles used for calibration and the method can be modified for real time calibration processing. An iterative process is used to converge to the actual bearings while the measured steering vector is estimated...
This paper presents the design and parametric testing of two FPGA-based, direction of arrival estimation algorithms (Bartlett and Minimum Variance Distortionless Response) for use in an adaptive array antenna system. The algorithms were implemented on a Xilinx Virtex-5 FPGA and tested using a test bed that emulates signals coming from an 8-channel, circular antenna head after being down converted...
This paper investigates three algorithms for estimating the direction of arrival (DOA) of incoming wireless signals. The algorithms studied are Minimum Variance Distortionless Response (MVDR), MUltiple SIgnal Classification (MUSIC) and Maximum Likelihood (ML). The goal was to study these algorithms under the following conditions: a sparse sensor array, unknown nonuniform noise and the presence of...
This paper describes an RF source localization and tracking system using an 8-element uniform circular array. The system is capable of precise RF source localization, fast target recognition and discrimination, fast spectral sensing, real-time processing for location tracking, and the suppression of jamming and multi-path signals. Existing systems and technology for precision location and tracking...
This paper presents our design of a cognitive beamforming array that can be used for communications and RF mapping. This novel approach is through joint frequency and spatial scan to establish both spatial and spectral knowledge of the local environment. With this information, we are able to establish the optimal frequencies and beam patterns to exploit the current environmental situation, including...
This paper presents a novel method for joint frequency and 2D angle estimation of incoming signals upon a circular array over a very wide frequency band (2-18 GHz). A temporal domain ESPRIT frequency estimation algorithm was extended for azimuth and elevation angles estimation. These direction estimation results are automatically paired with frequency. The algorithm provides non-ambiguous, high resolution...
This paper describes a novel approach of a robust and efficient 3D location estimation technique for non-cooperative, active or passive RF emitters in a noisy environment with two or more arbitrary shaped arrays. Each array can provide precise frequency, direction of arrival (DOA) estimation and time of - arrival (TOA) estimation for the far field RF emitters. For an M-element array, the DOA estimator...
This paper presents our design of a cognitive beamforming antenna that is capable of reconfiguring its spatial and spectral receiving and transmitting properties in response to the dynamic situations encountered. We accomplish this through joint frequency and spatial scans to establish both spectral and spatial knowledge of the local RF environment. With this information we are able to establish the...
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