Exploring Marine Atmospheric Ducts: Current Sensing and Emerging Trends

Tropospheric refraction significantly impacts the propagation of ultrashort- and microwave-frequency radio waves over marine environments. Atmospheric ducting, the most common super-refractive structure, allows radio waves to travel over the horizon. This holds significant practical value for applications such as maritime communication, remote radar monitoring, and navigation systems. However, atmospheric ducts can also present challenges, especially under unstable meteorological conditions. Atmospheric ducts may cause signal attenuation and even severe interference. Therefore, the detection of atmospheric ducting phenomena is crucial for ensuring the reliability of maritime communication systems and the accuracy of radar monitoring. This paper provides a comprehensive and systematic review of the current state of research on atmospheric duct detection, presenting a detailed analysis of several key methodologies. These include direct measurement techniques, model estimation approaches, numerical forecasting methods, and remote sensing inversion techniques. Additionally, the paper offers an in-depth examination of the strengths and limitations of each method in practical applications, while also highlighting the ongoing challenges within the field. In conclusion, this work aims to provide theoretical foundations and practical guidance for the future development of atmospheric duct detection technologies, fostering further advancements in both theoretical research and technical applications in the field.