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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...
In this paper, an area-efficient successive approximation register (SAR) analog-to-digital converter (ADC) with a dithering Vref is proposed. It reuses the capacitive array with the reconfiguration of Vref to Vref ± ΔV for reducing dramatically the ADC's area. The 2n resolution is achieved by the n bit SAR-ADC. To verify the proposed scheme, the proposed SAR ADC is implemented in a TSMC 0.18 μm 1P6M...
An adaptive inverse beamforming and CLEAN image processing method (IBF-CLEAN) was put forward to cancel tow ship noise. The tow ship noise is a wideband, spatially wide distributing noise with high intensity. It is the primary interference for towed line array. Inverse beamforming (IBF) can be used to cancel such directional noise. Iterative use of IBF can eliminate the reflection paths of the tow...
With the repaid development of multi-media and network, information are generated and spread quickly than before. The industry is expected to meet the needs by producing high performance CPU and high-density disk. But dramatic increase in energy requirements becomes a new challenging. Energy and human cost become the major parts of data center. More and more vendor provides efficiency products, such...
The real time requirement is an additional constraint on many intelligent applications in robotics, such as shape recognition and retrieval using a mobile robot platform. In this paper, we present a scalable approach for efficiently retrieving closed contour shapes. The contour of an object is represented by piecewise linear segments. A skip Tri-Gram is obtained by selecting three segments in the...
An X-band conformal array antenna designed for the use of unmanned aerial vehicles with polarimetric radars/sensors is presented. The array antennas mounted on the cylinder with various curvature radii are experimentally studied. The array can be easily placed on the aircraft fuselage or payload due to its ultra-thin and ultra-lightweight characteristics. It should have potential applications in radar...
A new dual-frequency dual-polarized array antenna for airborne applications is presented. Two planar arrays with ultra-thin substrates are integrated to provide a simultaneous operation of S-band and X-band. The ultra- thin array can be easily placed on the aircraft fuselage due to its lightweight and conformal structure, and will be useful for the use of wireless communications, radar, remote sensing,...
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