Results 1 to 10 of about 474,629 (269)

Feasibility Study of Microwave Radiometer Neural Network Modeling Method Based on Reanalysis Data

Atmosphere
To address the challenge of microwave radiometer modeling in regions lacking radiosonde data, this study proposes a neural network retrieval method based on high-resolution the Final Reanalysis (FNL) reanalysis data and validates its feasibility.
Xuan Liu, Qinglin Zhu, Xiang Dong, Houcai Chen, Tingting Shu, Wenxin Wang, Bin Xu   +6 more
doaj   +1 more source

Localization of Multiple GNSS Interference Sources Based on Target Detection in C/N₀ Distribution Maps

Remote Sensing
The localization of multiple interference sources in Global Navigation Satellite Systems (GNSS) can be achieved using carrier-to-noise ratio (C/N0) information provided by GNSS receivers, such as those embedded in smartphones.
Qidong Chen, Rui Liu, Qiuzhen Yan, Yue Xu, Yang Liu, Xiao Huang, Ying Zhang   +6 more
doaj   +1 more source

Physical Model of D-Region Ionosphere and Preliminary Comparison with IRI and Data of MF Radar at Kunming

Atmosphere, 2023
Based on the ion continuity equation solved under chemical equilibrium, a physical model of the D-region ionosphere (60–90 km) is established. The model involves 145 ion chemical reactions and includes 23 kinds of positive ions, 11 kinds of negative ions,
Mengyan Zhu, Tong Xu, Shuji Sun, Chen Zhou, Yanli Hu, Shucan Ge, Na Li, Zhongxin Deng, Yuqiang Zhang, Xiaolei Liu   +9 more
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Prediction Method of Maximum Propagation Angle in Parabolic Equation Model over Irregular Terrain

International Journal of Antennas and Propagation
The parabolic equation (PE) model is effective for predicting signal propagation over irregular terrains. The shift map method of the PE model is highly accurate and widely used for terrain propagation predictions.
Rui Zhang, Hongguang Wang, Zhensen Wu, Leke Lin, Zhenwei Zhao   +4 more
doaj   +1 more source

A Hybrid LSTM Framework for Short-Term Regional Wind Speed Forecasting Based on PCA and SSA-Optimized VMD

Applied Sciences
Accurate regional wind speed forecasting is critical yet challenging due to inherent spatiotemporal correlations and data non-stationarity. This paper proposes a hybrid framework combining Principal Component Analysis (PCA), Variational Mode ...
Huachen Li, Zhengzheng Ma, Liang Chen, Qinglin Zhu, Xiang Dong, Bin Xu, Yuanming Li, Mantong Zhang   +7 more
doaj   +1 more source

Improvement of SAMI2 with Comprehensive Photochemistry at Mid-Latitudes and a Preliminary Comparison with Ionosonde Data

Atmosphere
Photochemistry can significantly affect the ionospheric status. Adopting a comprehensive photochemical scheme with 60 reactions, primarily based on the recent systematic study of ion chemistry by Richards in 2011, we revised the open-source SAMI2 (Sami2 ...
Yanli Hu, Tong Xu, Shuji Sun, Mengyan Zhu, Zhongxin Deng, Zhengwen Xu   +5 more
doaj   +1 more source

Estimating Ionospheric Phase Scintillation Indices in the Polar Region from 1 Hz GNSS Observations Using Machine Learning

Remote Sensing
Ionospheric scintillation represents a disturbance phenomenon induced by irregular electron density variations, predominantly occurring in equatorial, auroral, and polar regions, thereby posing significant threats to Global Navigation Satellite Systems ...
Zhuojun Han, Ruimin Jin, Longjiang Chen, Weimin Zhen, Huaiyun Peng, Huiyun Yang, Mingyue Gu, Xiang Cui, Guangwang Ji   +8 more
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Winter thunderstorms in Kamchatka [PDF]

E3S Web of Conferences, 2019
Winter thunderstorms in Kamchatka are rare meteorological phenomena. To investigate the nature of this phenomenon, time variations of quasistatic electric field and meteorological quantities at «Paratunka» observatory, IKIR FEB RAS (φ = 52:97° N; λ = 158:
Smirnov Sergey, Mikhailov Yury, Mikhailova Galina, Kapustina Olga   +3 more
doaj   +1 more source

Flying Target Detection Technology Based on GNSS Multipath Signals

Sensors
In this study, a passive radar system that detects flying targets is developed in order to solve the problems associated with traditional flying target detection systems (i.e., their large size, high power consumption, complex systems, and poor ...
Pengfei Zhu, Qinglin Zhu, Xiang Dong, Mingchen Sun   +3 more
doaj   +1 more source

Statistical Study of Ionospheric Equivalent Slab Thickness at Guam Magnetic Equatorial Location

Remote Sensing, 2021
The ionospheric equivalent slab thickness (τ) is defined as the ratio of the total electron content (TEC) to the F2-layer peak electron density (NmF2), and it is a significant parameter representative of the ionosphere.
Yuqiang Zhang, Zhensen Wu, Jian Feng, Tong Xu, Zhongxin Deng, Ming Ou, Wen Xiong, Weimin Zhen   +7 more
doaj   +1 more source