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Aperture phased arrays operating up to 1.4 GHz are the most exciting receiver technology being developed for the Square Kilometre Array, SKA. The capabilities of a telescope using many phased array stations brings major scientific opportunities including very high survey speeds, flexibility for searching for transient phenomena, and multi-beaming capability which cannot be realized using any other...
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...
This paper proposes an array antenna calibration method for array antenna systems. The proposed method calibrates the amplitude and the phase of RF systems using internal coupler and switches without aids of external calibration systems. Computer simulation demonstrates that the proposed method corrects beamforming angles.
This paper describes the demonstration of a four-channel digital beamforming system incorporating highly integrated silicon germanium downconverter modules. The downconverter modules are designed to translate X-band frequencies (9 to 10.5 GHz) down to a common 1.0 GHz IF output. The modules were integrated with an X-band antenna array and high-speed digitizer system to form a rudimentary digital beamforming...
We propose a calibration algorithm for an array antenna suitable to DTV beamforming receivers in the presence of unknown gain and phase errors. The proposed algorithm is based on the subspace method which does not require a prior knowledge of the direction of arrivals (DOAs) of multipath signals. The calibration algorithm provides us with estimates of the DOAs of multipaths as well as the calibration...
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