Results 31 to 40 of about 12,150 (248)

Land-sea Separation and Sea Surface Zoning Algorithms for Sea Surface Target

Leida xuebao, 2019
Adaptive detection can effectively improve the detection performance of marine surveillance radars; however, the islands or lands introduce discrete or flaky strong clutter, which may result in wrong covariance matrix estimation.
ZHOU Ming, MA Liang, WANG Ning, YANG Yuhao   +3 more
doaj   +1 more source

Weak Target Detection in the Presence of Sea Clutter Using Radon-Fractional Fourier Transform Canceller

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2021
In this article, we propose a new weak maneuvering target detection method in a sea environment with a Radon-fractional Fourier transform (RFrFT) canceller, which can efficiently suppress the sea clutter and detect targets with low computations.
Chang Gao, Ran Tao, Xuejing Kang
doaj   +1 more source

Property Analysis and Suppression Method of Real Measured Sea Spikes

Leida xuebao, 2015
In case of high-resolution, low grazing angle, high sea state, and horizontal transmitting, horizontal receiving polarization, the radar returns are strengthened, resulting in sea spikes.
Huang Yong, Chen Xiao-long, Guan Jian
doaj   +1 more source

A Single-Dataset-Based Pre-Processing Joint Domain Localized Algorithm for Clutter-Suppression in Shipborne High-Frequency Surface-Wave Radar

Sensors, 2020
Due to the motion of the platform, the spectrum of first-order sea clutter will widen and mask low-velocity targets such as ships in shipborne high-frequency surface-wave radar (HFSWR).
Liang Guo, Xin Zhang, Di Yao, Qiang Yang, Yang Bai, Weibo Deng   +5 more
doaj   +1 more source

Ionospheric Clutter Suppression with an Auxiliary Crossed-Loop Antenna in a High-Frequency Radar for Sea Surface Remote Sensing

Journal of Marine Science and Engineering, 2021
Ionospheric clutter is one of the main problems for high-frequency surface wave radars (HFSWRs), as it severely interferes with sea surface state monitoring and target detection.
Shuqin He, Hao Zhou, Yingwei Tian, Wei Shen   +3 more
doaj   +1 more source

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Waveform Design for Improved Detection of Extended Targets in Sea Clutter

Sensors, 2019
Adaptive waveform design for cognitive radar in the case of extended target detection under compound-Gaussian (CG) sea clutter is addressed. Based on the CG characteristics of sea clutter, the texture component is employed to characterize the clutter ...
Linke Zhang, Na Wei, Xuhao Du
doaj   +1 more source

A severely range ambiguous clutter suppression method based on multi‐domain cascaded signal processing for space‐based early warning radar

IET Radar, Sonar & Navigation, 2023
The non‐stationary clutter phenomenon and the severe range ambiguity make space‐based early warning radar as an intricate model of received ground and sea clutter.
Tianfu Zhang, Zhihao Wang, Mengdao Xing, Shuangxi Zhang, Yongliang Wang   +4 more
doaj   +1 more source

3D Large‐Scale Subwavelength‐Resolution Sound Sheet Tomography Based on an Active and Programmable Circular Meta‐Array

Advanced Science, EarlyView.
A programmable 2048‐element circular ultrasound array combined with a compact acoustic lens produces a thin “sound sheet” over a large field of view, and records echoes with wide angular diversity across the ring aperture. Coherence‐enhanced beamforming converts full‐matrix data into high‐contrast tomographic slices, delivering near‐diffraction‐limited
Qiu‐De Zhang, Zi‐Bin Lin, Zhuo Chen, Zhao‐Hui Liu, Jin‐Lian He, Jun‐Jie Song, Long‐Sheng Zeng, Liang Zhou, Ming‐Yue Ding, Yu‐Gui Peng, Ming Yuchi, Xue‐Feng Zhu   +11 more
wiley   +1 more source

Overview and Prospects of Radar Sea Clutter Measurement Experiments

Leida xuebao, 2019
In complex marine environments, sea clutter greatly affects the detection performance of maritime targets. Because the influencing factors of sea clutter are numerous and the mechanism is complex, there are great difficulties in feature description and ...
DING Hao, LIU Ningbo, DONG Yunlong, CHEN Xiaolong, GUAN Jian   +4 more
doaj   +1 more source