Results 41 to 50 of about 705,367 (158)

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

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

Comparison and Analysis of Stellar Occultation Simulation Results and SABER-Satellite-Measured Data in Near Space

Remote Sensing, 2022
In this study, we analyze the accuracy of the stellar occultation technique to detect the oxygen number density and temperature in near space. Based on the validation of the algorithm related to stellar occultation using a single wavelength of 762 nm ...
Mingchen Sun, Xiang Dong, Qinglin Zhu, Xuan Cheng, Hongguang Wang, Jiaji Wu   +5 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

A Transferable Real‐Time MUF Forecasting Model for HF Communication in China

Space Weather, Volume 24, Issue 4, April 2026.
Abstract High‐frequency (HF) communication is an important means of strategic and emergency communication, playing an irreplaceable role in both military and civil applications. The maximum usable frequency (MUF) is a key parameter controlling HF signal propagation, and its real‐time and accurate forecast has long been a major challenge in engineering.
Qiao Yu, Jian Wang, Yafei Shi, Zhanfeng Zhu, Jieqing Fan, Tong Xu, Cheng Yang   +6 more
wiley   +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

Relative Contributions of Solar Wind Dynamic Pressure and Interplanetary Electric Field on the Early Positive Part of Main Phase of Geomagnetic Storms

Space Weather, Volume 24, Issue 3, March 2026.
Abstract The important early declining part of the main phase (MP) of geomagnetic storms in SYM‐H (and Dst) from positive main phase onset (MPO) to 0‐level of SYM‐H was somehow missed in the treatment of the storms. We included the missed part (or revised the storms) by raising the 0‐level of SYM‐H to MPO‐level, and showed that the inclusion is ...
Jijin K. Raj, N. Balan, Qing‐He Zhang, Y. Otsuka, K. Shiokawa, Zan‐Yang Xing, V. Manu, B. Nilam, Yu‐Zhang Ma, Yong Wang   +9 more
wiley   +1 more source

Wireless networks: What next for radiowave propagation research

, 2008
This paper chronicles the progress in wireless information transmission and reception, and discusses future trends in radiowave propagation research. Since the conception of wireless transmission, a number of pioneers have successfully understood and ...
Allen, Ben, David J. Edwards, Malik, Wasim Q., Wasim Q. Malik, Edwards, David J., Ben Allen   +5 more
core   +1 more source

Global Ionospheric Slab Thickness Prediction Model Using XGBoost and Ensemble Learning

Space Weather, Volume 24, Issue 1, January 2026.
Abstract The ionospheric equivalent slab thickness is a key parameter for understanding the plasma distribution in the ionosphere, with direct relevance to satellite navigation, communication, and skywave over‐the‐horizon radar. However, traditional prediction methods often suffer from regional biases, limiting their global applicability.
C. Han, X. R. Chong, M. Ou, D. D. Wang, J. Feng, G. Chen, X. L. Min, D. W. Wang, Z. X. Gao   +8 more
wiley   +1 more source

UAV‐Radar‐Based Through‐Wall Human Activity Recognition via Frequency‐Selective STFT‐ResNet

Electronics Letters, Volume 62, Issue 1, January/December 2026.
This letter presents a UAV‐mounted radar system for through‐wall human activity recognition in high‐rise buildings. By combining STFT‐based spectrogram processing with a frequency‐selective ResNet18 network, the method effectively filters noisy subcarriers and classifies activities with high accuracy. Experimental results demonstrate 98.08% recognition
Chenghao Wang, Juan Chen, Yuemeng Yin, Xing Cheng, Dandan Cheng   +4 more
wiley   +1 more source