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Your search keyword '"Zhu, Bocheng"' showing total 44 results
Start Over Author "Zhu, Bocheng" Publisher ieee
44 results on '"Zhu, Bocheng"'

16. A novel broadband microstrip antenna

Author

Liu Zhangfa, Li Shi-zhi, and Zhu Bocheng

Subjects
Folded inverted conformal antenna, Patch antenna, Microstrip antenna, Coaxial antenna, Computer science, Antenna measurement, Electronic engineering, Antenna noise temperature, Antenna factor, Monopole antenna
Abstract

A new approach for the design of broadband double-deck microstrip patch antenna is presented. It has been shown that the double-deck microstrip patch antenna can have a lower input VSWR and realize a flat gain within a desired bandwidth by adopting the combination method of the antenna's structure and matching network. The achieved input impedance bandwidth are 25% and 23% for a VSWR lower than 1.7 and 1.5 respectively.

Published
2002

18. GNSS reliability and positioning accuracy enhancement based on fast satellite selection algorithm and RAIM in multiconstellation.

Author

Meng, Fanchen, Wang, Shan, and Zhu, Bocheng

Abstract

In order to improve the performance of positioning reliability, accuracy, and robustness in Global Navigation Satellite System (GNSS), several special actions, including receiver autonomous integrity monitoring (RAIM), weighted matrix estimation in weighted least squares (WLS), geometric dilution of precision (GDOP) in satellite geometry distribution, need to be taken into consideration in multiconstellation. With the extensive application and popularization of GPS, it makes remarkable contributions to scientific applications and engineering services. Currently, two emerging constellations (BDS, Galileo) as well as the recovery of GLONASS, the multiconstellation GNSS is undergoing dramatic development with better performance. Once the four systems are fully deployed, about 120 satellites will be available for GNSS users [1]. If all the visible satellites are used for position resolving, it will burden the receiver processor significantly. Meanwhile, there may be larger pseudorange measurement errors when the satellites have low elevation for the transmission of ionospheric and tropospheric delay. In addition, we cannot neglect simultaneous multiple outliers in multiconstellation GNSS compared with conventional RAIM. With respect to the weighted matrix factor in WLS, i.e., the uncertainty of the pseudorange measurements, estimation error is often used for weighted matrix estimation, without concerning real-time transmission error and signal quality, which somewhat enlarges the positioning accuracy. Thus, there is a need to deal with the above concerns. [ABSTRACT FROM PUBLISHER]

Published
2015
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40. FPGA based SPECAN algorithm implementation for ScanSAR imaging.

Author

Pang, Long, Wang, Zongbo, and Zhu, Bocheng

Abstract

An FPGA based implementation of spectral analysis (SPECAN) algorithm for ScanSAR imaging is given in this paper. In order to meet the requirements of system miniaturization and low power consumption, the whole imaging processing will be divided into several time-division stages and mapped to reusable calculation modules and control logics, an optimized processing structure in FPGA is proposed to integrate all the processing procedure in single FPGA chip. In the verification part, FPGA based processing has been compared with Matlab based off-line processing. The experimental results indicate the validity of the design and engineering applicability of the proposed structure. [ABSTRACT FROM PUBLISHER]

Published
2012

41. Analysis of conformal conical log-spiral antennas on dielectric cavities.

Author

Tan, Yunhua, Hu, Huilin, Zhu, Bocheng, and Zhou, Lezhu

Abstract

Radiation properties of conformal conical log-spiral antennas (CLSA) on dielectric cavities are investigated by using the hybrid finite element and boundary integral equation method (FE-BI) in the paper. Firstly the radiation patterns of ordinary conformal CLSA on solid dielectric cones are introduced. Then the radiation properties of conformal CLSA on dielectric cavity with metal inner wall are discussed in detail. The influence of different media and different frequencies on antenna patterns is studied. Comparison with the results of solid dielectric cones and CLSA in the air is also made. The final numerical results show that radiation properties of conformal CLSA on dielectric cavities are greatly changed by these parameters. All parameters should be carefully considered in practical applications. [ABSTRACT FROM PUBLISHER]

Published
2011

43. A Visual Search Inspired Computational Model for Ship Detection in Optical Satellite Images.

Author

Bi, Fukun, Zhu, Bocheng, Gao, Lining, and Bian, Mingming

Abstract

In this letter, we propose a novel computational model for automatic ship detection in optical satellite images. The model first selects salient candidate regions across entire detection scene by using a bottom-up visual attention mechanism. Then, two complementary types of top-down cues are employed to discriminate the selected ship candidates. Specifically, in addition to the detailed appearance analysis of candidates, a neighborhood similarity-based method is further exploited to characterize their local context interactions. Furthermore, the framework of our model is designed in a multiscale and hierarchical manner which provides a plausible approximation to a visual search process and reasonably distributes the computational resources. Experiments over panchromatic SPOT5 data prove the effectiveness and computational efficiency of the proposed model. [ABSTRACT FROM PUBLISHER]

Published
2012
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