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This paper presents the test on a prototype of a multiple-beam reflector antenna subsystem. That subsystem is developed for payload on broadband communication satellites. Design considerations and part of early experimental results have previously been reported. The following context focuses on the calibration method, the improved test procedure and the related results.
The measurement of dark measurement objects with difficult surface characteristics is always a challenging task. Especially the measurement of pipes which cannot be measured in transmitted light conditions will lead to complicated situations during the image processing and the ongoing feature detection. In this paper two different methods will be presented which will overcome this problem. A quality...
In this paper, a novel self-calibration method is proposed for uniform rectangular arrays to estimate two-dimensional (2-D) direction of arrival (DOA) in the presence of mutual coupling. By rearranging the perturbed array response in the transform domain, the estimation of 2-D DOA is decoupled from the calibration process, and the aperture loss is avoided as well. Then resorting to the rank reduction...
Photoacoustic (PA) imaging is a potential new biomedical imaging technique with combined advantages of ultrasonography's good resolution and high contrast of optical imaging. The spectrum parameters obtained from photoacoustic spectrum analysis (PASA) have been found to have the relationship with tissue microstructure. However, the effects of transducer positions on PASA have not been studied yet...
With advantages of high sensitivity, small size, and easy integration, HTc rf SQUID magnetic sensor is important means of weak magnetic signal detection and reception including bio-magnetic measurements, nondestructive testing, and geophysical exploration. To improve the measurement accuracy, calibration of HTc rf SQUID sensors is necessary. Due to the different principles, the calibration method...
Multiple antennas techniques have been widely adopted in broadband wireless communication systems to enhance spectral efficiency and achieve space diversity gain. Transmitter beamforming is one of promising multiple antenna techniques for IMT-Advanced system, which takes advantage of directional signal transmission or reception. For efficient transmitter beamforming, TDD (Time Division Duplex) system...
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