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Two new broadband CP reflectarray elements operating at 15 GHz are proposed and two reflectarrays with the corresponding elements are simulated. The results of a traditional reflectarray consisting of the split ring element at 15 GHz are presented for comparison. As the results show that the bandwidths of the proposed elements and reflectarrays are improved efficiently compared to the split ring element...
This paper presents a new broadband metal-only reflectarray antenna. The designed reflectarray antenna operating at 12.5 GHz doesn't contain any dielectric substrate by using a modified slot structure. The slot-type element is optimized to provide a linear phase curve and a phase-shift range in excess of 360 degrees is achieved. With an offset feed configuration, a 9×9 elements reflectarray antenna...
Evaluating the social value of voluntary service (especially the quality of collaborative service) not only measures the degree of society civilization, but also provides the guidance or indicator of overall arrangement of voluntary service and utilization efficiency of voluntary resources. Along with the informatization development of the network, the release, implementation and evaluation of voluntary...
In 2014, TerraSAR-X (TSX) mission were extended by implementing two new modes. One is Staring Spotlight (ST) mode. The ST mode increases the high geometric resolution of the standard High Resolution Spotlight product. By widening the azimuth beam steering angle range and therewith extending the synthetic aperture an azimuth resolution of 0.24 m can be achieved. In this paper, some types of damage...
Digital elevation model (DEM) matching is a necessary task that must be conducted in many applications of remote sensing, especially for purposes of disaster surveillance (e.g., landslide, debris flow). In this paper, we propose a robust matching method based on contour lines and least squares surface matching. Challenges involve detecting stable and invariant control points (CPs) in un-deformed areas...
The grammar of facade structures is often related to regularly distributed signature patterns in high-resolution synthetic aperture radar (SAR) images. Given the structural details in the SAR image, algorithms for building extraction/monitoring should exploit this contextual information for an object-based analysis. In this paper we propose a framework to extract detailed high rise building features...
A simple low-sampling-rate receiving scheme is proposed for W-band OFDM-RoF systems. Using the proposed preprocess, aliasing-free subcarriers can be received, and employing the optimized delays to ADCs can achieve the performance insensitive to sampling rate.
The paper develops a decision support system for orthodontics, which is evidence-based and can reduce the bias of subjective judgments of orthodontists, meet the expectation of the patients, and increase the cost performance and effectiveness. The steps of constructing the system can be divided into eight steps, selecting influencing factors, adjust images, measurement of image, collecting related...
This paper investigates a general algorithm to achieve the automation of fuzzy sets ranking. Current methods of finding the maximizing and minimizing fuzzy sets and calculating their difference are manually operated with a large computational complexity, and a universal analytic algorithm is hard to realize. With the inspiration of principles of computer graphics technologies, a novel algorithm of...
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