XW

Xuetian Wang

Beijing Institute of Technology

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Hongmin Gao

Hohai University

Jiawei Zang

China Academy of Information and Communications Technology

Lili Fang

Nanjing University

Jiafei Zhao

State Key Laboratory of Remote Sensing Science

Rongkun Jiang

Beijing Institute of Technology

Le Zou

Beijing Institute of Technology

Wei Wang

Beijing Institute of Technology

Jiaxing Hao

Shijiazhuang Tiedao University

Hongmin Gao

Beijing Institute of Technology

Aly E. Fathy

University of Tennessee at Knoxville

Cooperative Institutions

Beijing Institute of Technology

Chinese Academy of Sciences

University of Chinese Academy of Sciences

PLA Army Engineering University

University of Electronic Science and Technology of China

Huazhong University of Science and Technology

University of Science and Technology of China

South China University of Technology

University of California, Davis

Peking University

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8 mm Passive Focal Plane Image System

Procedia Environmental Sciences (2011)

Lili Fang Xuetian Wang Shi Yong-feng

A 8 mm passive focal plane image system which could be applied for airplane ils was introduced in this paper. System parameters were designed for this special purpose. Since high gain must be obtained based on limited feed antenna's aperture, dielectric-loaded horn antenna was designed as the feed of parabolic reflector antenna to receive the power radiated from the object. 8 mm direct detector receivers were connected directly to the feed horn antennas to avoid undesirable blockage. From the imaging results, the concrete buiding could be distinguished easily from the sky in the passive millimeter wave image.

Reflector (photography)

Aperture (computer memory)

Cassegrain antenna

Horn antenna

Feed horn

Extremely high frequency

Parabolic reflector

10.1016/j.proenv.2011.09.120

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Citations (0)

Series-Fed Monopulse Microstrip Array Antenna With Stripline Quadrature Hybrid Comparator Network

IEEE Access (2021)

Le Zou Xuetian Wang Jiawei Zang

Microstrip series-fed weighted arrays have widespread applications in millimeter wave (MMW) radar due to their low profile and light weight. Our study proposes a novel Ka-band compact monopulse radar antenna design with a highly directional 2D series-fed microstrip array antenna. The structure is composed of a symmetrical four quadrant radiation array and an innovative stripline monopulse comparator with two segments. Our novel design applies the stripline in the back-end which considerably reduces the antenna's backward radiation. The shaped patterns in the E and H planes are achieved by tapering patch widths and adjusting the impedance transformer of each subarray. Four half power quadrature hybrids are combined to form 2D monopulse feeding in the back-end. Both parts adopt a simple symmetrical layout that simplifies the design process. The measured reflection coefficients of each port are lower than -10 dB across 34.5 GHz to 35.5 GHz working band meanwhile isolation between these ports are better than 25 dB. Furthermore, the first side lobe level (FSLL) in the sum beam, which is remarkably suppressed by Taylor synthesis design method, achieves about -24 dB both in E and H planes. The measured gain of the sum pattern achieves 25.3 dBi at 35 GHz center frequency, while the nulling depth of the difference patterns in both planes are lower than -30 dB.

Stripline

Monopulse radar

10.1109/access.2021.3138698

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Citations (8)

Robust CFAR Detection for Multiple Targets in K-Distributed Sea Clutter Based on Machine Learning

Symmetry (2019)

Jiafei Zhao Rongkun Jiang Xuetian Wang Hongmin Gao

For K-distributed sea clutter, a constant false alarm rate (CFAR) is crucial as a desired property for automatic target detection in an unknown and non-stationary background. In multiple-target scenarios, the target masking effect reduces the detection performance of CFAR detectors evidently. A machine learning based processor, associating the artificial neural network (ANN) and a clustering algorithm of density-based spatial clustering of applications with noise (DBSCAN), namely, DBSCAN-CFAR, is proposed herein to address this issue. ANN is trained with a symmetrical structure to estimate the shape parameter of background clutter, whereas DBSCAN is devoted to excluding interference targets and sea spikes as outliers in the leading and lagging windows that are symmetrical about the cell under test (CUT). Simulation results verified that the ANN-based method provides the optimal parameter estimation results in the range of 0.1 to 30, which facilitates the control of actual false alarm probability. The effectiveness and robustness of DBSCAN-CFAR are also confirmed by the comparisons of conventional CFAR processors in different clutter conditions, comprised of varying target numbers, shape parameters, and false alarm probabilities. Although the proposed ANN-based DBSCAN-CFAR processor incurs more elapsed time, it achieves superior CFAR performance without a prior knowledge on the number and distribution of interference targets.

DBSCAN

Robustness

False alarm

10.3390/sym11121482

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Citations (19)

MEASUREMENTS AND MODELING OF PATH LOSS OVER IRREGULAR TERRAIN FOR NEAR-GROUND AND SHORT-RANGE COMMUNICATIONS

Progress In Electromagnetics Research M (2017)

Jiawei Zang Xuetian Wang

10.2528/pierm17032806

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Citations (15)

An Improved Doppler Centroid Estimation Scheme Based on Inertial Data and Raw Data

Transactions of Beijing Institute of Technology (2010)

This paper describes an improved Doppler centroid estimation scheme,which determines the pulse repetition frequency(PRF) fractional part of the Doppler centroid and resolves the problem of Doppler ambiguity.Experiments show that the scheme could estimate the Doppler centroid accurately and rapidly for synthetic aperture radar(SAR) under the high velocity diving model.The scheme involves two estimation methods.First,the attitude and velocity data,which is provided by inertial navigation system(INS),are used to resolve the ambiguity.Second,the raw data is used to evaluate the PRF fractional part accurately.Combined together with the above measures,the Doppler centroid estimation for diving model can be achieved quickly with sufficient accuracy.

Centroid

Pulse repetition frequency

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LTSA with microstrip-slotline transition for MFPA imaging systems

Wang Wen Xuetian Wang Lili Fang

The arranging density of the feeding antenna is the main factor which decides the spatial sampling rate of the millimeter-wave focal plane array(MFPA) imaging systems. This paper proposes a new kind of feed antenna. Comparing with the other feeding antennas, it has broader waveband, lower side lobe, lower mutual coupling, a moderate gain and constant input impedance in a very wide frequency range. It is easier to form a close feed array which can realize an effective exposure to the lens or the reflector antenna with less over flow loss. A detailed theoretical analysis, simulation and optimization of the design are done to develop the linearly tapered slot antenna(LTSA), its microstrip-slotline transition and antenna feed array. They show the good availablity of LTSA in MFPA imaging systems.

Reflector (photography)

Side lobe

10.1109/icmtce.2011.5915497

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Citations (5)

Path Analysis of Diffraction Model in Mountainous Environment

DEStech Transactions on Computer Science and Engineering (2019)

Fang Xin-xin Jincheng Zhou Xuetian Wang

This paper analyzes the wireless transmission path model in mountainous environments. Diffraction propagation is the main method of electromagnetic wave propagation in mountainous environment. This paper first analyzes the mountain diffraction loss model based on fresnel integral and discusses the expansion formula of fresnel integral, and applies the range to single peak diffraction formula and double diffraction. Last discussed the relationship between the frequency, distance and height of radio wave propagation when the receiver sensitivity is 150dB, and finally the establishment of the diffraction model, which improves the process of radio wave prediction effectiveness.

Radio propagation model

Fresnel zone

10.12783/dtcse/cisnrc2019/33298

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Planar antipodal linearly tapered slot antenna using grounded coplanar waveguide-to-substrate integrated waveguide transition for passive millimeter-wave imaging

Wen Wang Xuetian Wang Aly E. Fathy

In this work, a novel antipodal linearly tapered slot antenna (ALTSA) with two types of grounded coplanar waveguide (GCPW)-to-substrate integrated waveguide (SIW) transitions are proposed and demonstrated. The antenna is well designed for using as a feed antenna in the focal plane array (FPA) imaging system. PCB technology is used to fabricate the SIW antenna in a single layer structure. Good agreement was obtained between the simulation and measurement results. The return loss of the proposed antenna can achieve below −13dB at Ka-band, meanwhile, the E-plane side lobe is almost 15dB down. When placed on the focal plane of a reflector antenna, its side lobe dropped to 40dB down, which shows its high suitability for passive millimeter-wave (PMMW) FPA imaging system.

Coplanar waveguide

Antipodal point

Return loss

Reflector (photography)

Extremely high frequency

Waveguide

10.1109/rws.2014.6830082

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Nonreciprocal Yagi–Uda Filtering Antennas

IEEE Antennas and Wireless Propagation Letters (2019)

Jiawei Zang Xuetian Wang Alejandro Álvarez Melcón J. S. Gómez‐Díaz

This letter proposes a novel and compact nonreciprocal filtering antenna based on temporal modulation. The device is composed of a third-order filtering section integrated into a Yagi-Uda planar printed antenna. Strong nonreciprocity in transmission and reception is achieved at the same operation frequency by time-modulating the resonators of the filtering section. These resonators are implemented as quarter-wavelength microstrip lines terminated with varactors located on the ground plane. Such plane is also employed as a reflector for the Yagi-Uda antenna and to host the coplanar waveguides that feed low-frequency signals to the varactors, thus leading to a very compact design. A prototype is manufactured and successfully tested at 2.4 GHz, showing isolations greater than 20 dB between transmission and reception modes in both E- and H-planes for all directions in space and a gain drop of only 3.5 dB compared to a reference antenna. The proposed devices can easily be integrated with other electronic circuits and may find exciting applications in communication, radar, and sensing systems.

10.1109/lawp.2019.2947847

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Citations (15)

The effect of polarizing beam splitter in 225GHz

IET Conference Publications (2009)

Chen Jiecheir Xuetian Wang Hanchen Huang

We demonstrate the working principle of the 225GHz duplexer, and investigate the polarizing beam splitter which is the focus of a quasi-optical duplexer. At last the simulations (made by HFSS) reveal the best size of the polarizing beam splitter. (4 pages)

Beam splitter

Duplexer

Splitter

Optical materials

HFSS

10.1049/cp.2009.0214

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Citations (3)