Weikang Si

Superlet Parameter Optimization for Heart Rate Extraction Using FMCW Radar in the In-Cabin Electromagnetic Environment

Zihan Yang, Qian Yan, Ning Zhou, Jiabao Zhang et autres

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Equivalent Absorber Modeling for Anechoic Chamber Simulation: A Review of Methods and Trends

Kun‐Lai Li, Weikang Si, Zhengpeng Wang, Xiaohai Cui et autres

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RCS measurement of K-band calibration target based on extrapolation method

Yifan Han, Yuming Bai, Ke Li, Weikang Si

Abstract Electromagnetic stealth technology is a cutting-edge scientific research field. It requires high-precision radar cross-section (RCS) measurements. With the rapid development of information equipment, the requirements for measurement accuracy for stealth equipment are becoming increasingly demanding. In this work, a novel extrapolation …

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Removing target-background coupling via Freeman-Durden polarimetric decomposition and phase-preserving reconstruction

Zongkai Yang, Yijia Chen, Weikang Si

Abstract A phase-preserving polarimetric methodology for coupling suppression in radar cross-section (RCS) measurement is presented. For each pixel/bin, a Freeman-Durden three-component decomposition calculates surface, double-bounce, and volume powers using linear polarization; co-polar responses are subsequently reconstructed using explicit double-bounce nulling while preserving …

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Efficient Optimization of Higher-Order PML Based on Surrogate-Assisted Evolutionary Algorithm

Kun‐Lai Li, Zhengpeng Wang, Yongjun Xie, Xiao Liu et autres

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Probing Scientific General Intelligence of LLMs with Scientist-Aligned Workflows

Wanghan Xu, Yuhao Zhou, Yifan Zhou, Qinglong Cao et autres

Despite advances in scientific AI, a coherent framework for Scientific General Intelligence (SGI)-the ability to autonomously conceive, investigate, and reason across scientific domains-remains lacking. We present an operational SGI definition grounded in the Practical Inquiry Model (PIM: Deliberation, Conception, Action, Perception) and …

Probing Scientific General Intelligence of LLMs with Scientist-Aligned Workflows

Wanghan Xu, Yuhao Zhou, Yifan Zhou, Qinglong Cao et autres

Despite advances in scientific AI, a coherent framework for Scientific General Intelligence (SGI)-the ability to autonomously conceive, investigate, and reason across scientific domains-remains lacking. We present an operational SGI definition grounded in the Practical Inquiry Model (PIM: Deliberation, Conception, Action, Perception) and …

Higher-Order Matrix Exponential Perfectly Matched Layer Scheme With Sub-Gridding Technique Based on the Factorization Approximate Crank–Nicolson Algorithm

Weikang Si, Haolin Jiang, Yongjun Xie, W. Wang et autres

Although finite difference time-domain (FDTD) algorithms are potentially applicable to broadband wave propagation and radiation problems, various problems related to the absorbing boundary condition and complex structural meshing limit the accuracy of FDTD calculations. This paper develops an unconditionally stable Crank–Nicolson factorization-splitting …

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On-demand high gain and directional surface wave antenna with 100° field of view based on grounded dielectric metasurface

Ke Pang, Yongjun Xie, Weikang Si, Pei‐Yu Wu et autres

We present a surface wave antenna based on a grounded dielectric metasurface-integrated Luneburg lens. This innovative design achieves a compact footprint, superior efficiency, and cost-effectiveness relative to traditional phased array antennas. The metasurface unit cells are optimized through an efficient approach to …

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A Target Near-Field Scattering Measurement Technique Utilizing 3D Near-Field Imaging via Cylindrical Scanning

Zurong Yang, Jingcheng Zhao, Weikang Si, Changyu Lou et autres

Radar target near-field scattering characteristics are essential for the identification of target properties and the improvement of target recognition. Nevertheless, the efficiency of current precision three-dimensional (3D) imaging algorithms in near-field scattering measurements is restricted by their substantial computational complexity. To resolve …

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Analysis of Frequency Response Characteristics of Automotive Millimeter-Wave Radar Target Simulator

Changzhi Li, Yinghong Wen, Weilong Wang, Weikang Si et autres

Abstract Presently, Radar Target Simulator (RTS) has become a key instrument in the research and development process of automotive millimeter-wave radar. However, the amplitude-phase distortion resulting from non-ideal electronic components can impact its accuracy in simulating real traffic targets. This paper analyzes …

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Modified Linear Aperture Imaging Technique for Concave Structures in Near-Field Measurement Applications

Weikang Si, Weilong Wang, Xiao Liu, Wenli Lu et autres

Abstract This manuscript addresses the challenge of imaging artifacts in millimeter-wave (MMW) systems caused by concave structures due to multiple internal reflections. We introduce an modified linear aperture imaging technique specifically designed for concave structures, which effectively suppresses high-order scattering artifacts and …

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