Results 21 to 30 of about 172,216 (206)

Performance of Reconstruction Algorithm Based on Sub-Nyquist Bandpass Sampling in the Pulse Position Modulation-Ultra Wide Band System

Leida xuebao, 2015
The signal reconstruction algorithm with sub-Nyquist bandpass sampling in Pulse Position Modulation-Ultra Wide Band (PPM-UWB) signal processing is analyzed based on PPM-UWB signal demodulation.
Zou Ning, Xu Zheng-guang, Ran Jian-hua, Li Chao-yang   +3 more
doaj   +1 more source

Non-Satellite Broadband Maritime Communications for e-Navigation Services

IEEE Access, 2021
The development of broadband network access technologies available to users on land has triggered a rapid expansion of a diverse range of services provided by terrestrial networks.
Michal Hoeft, Krzysztof Gierlowski, Jacek Rak, Jozef Wozniak, Krzysztof Nowicki   +4 more
doaj   +1 more source

Are object detection assessment criteria ready for maritime computer vision? [PDF]

, 2019
Maritime vessels equipped with visible and infrared cameras can complement other conventional sensors for object detection. However, application of computer vision techniques in maritime domain received attention only recently.
Dong, Huixu, Prasad, Dilip K., Quek, Chai, Rajan, Deepu   +3 more
core   +2 more sources

Compact and Integrated Microstrip Antenna Modules for mm-Wave and Microwave Bands Applications

IEEE Access, 2022
This paper presents two different antenna modules at two different bands with a compact size structure that is used for both of mm-Wave and microwave bands, with the objective of keeping the size as minimum as possible.
Marwa M. El-Wazzan, Hussein H. Ghouz, Sherif K. El-Diasty, Mohamed A. Aboul-Dahab   +3 more
doaj   +1 more source

On Small Satellites for Oceanography: A Survey [PDF]

, 2015
The recent explosive growth of small satellite operations driven primarily from an academic or pedagogical need, has demonstrated the viability of commercial-off-the-shelf technologies in space. They have also leveraged and shown the need for development
Agelet, Fernando Aguado, Bertolami, Orfeu, Francisco, Frederico, Guerra, André G. C., Rajan, Kanna, Villate, Jaime   +5 more
core   +3 more sources

Robust Underwater Acoustic Communication Using the Overlapped Chirp Spread Carrier Technique in Doubly Spread Environments

IEEE Access, 2023
The performance of underwater acoustic communication is significantly affected by multipath propagation and Doppler spread. In this paper, we propose a new communication technique called overlapped chirp spread carrier (OCSC) by modifying the existing ...
Chang-Hyun Youn, Hyung-In Ra, Kyung-Won Lee, Ki-Man Kim   +3 more
doaj   +1 more source

Long-Range Acoustic Communication Using Differential Chirp Spread Spectrum

Applied Sciences, 2020
Here, we propose a new modulation method using chirp spread spectrum (CSS) modulation to indicate the result of long-range acoustic communication (LRAC).
Joohyoung Lee, Jeongha An, Hyung-in Ra, Kiman Kim   +3 more
doaj   +1 more source

The Preliminary Investigation of Communication Characteristics Using Evaporation Duct across the Taiwan Strait

Journal of Marine Science and Engineering, 2022
Affected by the Taiwan Strait Warm Current, the evaporation intensity around the Taiwan Strait is significantly higher than in other southern and eastern coastal areas of China.
Cheng Yang, Yafei Shi, Jian Wang
doaj   +1 more source

Communication Technology of Far-Sea Cross-Domain Buoys Based on High Frequency Sky-Wave Propagation

水下无人系统学报
High frequency(HF) sky-wave propagation is limited by the working frequency, and the antenna size meeting high gain and adapting to high sea conditions is large, so the application scenario is seriously limited.
Longzhong XIAO, Song ZHANG, Zhenji LIU, Yi ZHAO   +3 more
doaj   +1 more source

Comparison of Econometric Models and Artificial Neural Networks Algorithms for the Prediction of Baltic Dry Index

IEEE Access, 2019
The shipping market, a major component of the global economy, is characterized by high risk and volatility. The Baltic dry index is an influential indicator in the world shipping market and international trade.
Xin Zhang, Tianyuan Xue, H. Eugene Stanley   +2 more
doaj   +1 more source