Results 11 to 20 of about 589 (217)

Estimation and evaluation of COSMIC radio occultation excess phase using undifferenced measurements [PDF]

Atmospheric Measurement Techniques, 2017
In the GPS radio occultation technique, the atmospheric excess phase (AEP) can be used to derive the refractivity, which is an important quantity in numerical weather prediction.
P. Xia, S. Ye, K. Jiang, D. Chen
doaj   +1 more source

Retrieval of Tropospheric Refractivity Profiles Using Slant Tropospheric Delays Derived From a Single Ground‐Based Global Navigation Satellite System Station

Earth and Space Science, 2019
The Global Navigation Satellite System (GNSS) has proved to be a powerful tool for applications in meteorology. In this study, we propose a novel slant tropospheric delay (STD) model to obtain the vertical distribution of atmospheric refractivity based ...
Pengfei Xia, Shirong Ye, Min Guo, Weiping Jiang, Caijun Xu   +4 more
doaj   +1 more source

Development and evaluation of airborne microwave refractometer for studies on atmospheric tropical boundary layer radiorefractive index [PDF]

Annales Geophysicae, 1994
Observations of high-resolution data on radio refractivity were obtained by the airborne microwave refractometer over the Indian sub-continent (a tropical country) from 1971 to 1988. Detailed vertical and horizontal distributions of radio refractivity
S. B. S. S. Sarma, B. M. Reddy
doaj   +1 more source

Retrieving tropospheric refractivity structure using interferometry of aircraft radio transmissions [PDF]

Atmospheric Measurement Techniques
Detailed measurements of atmospheric humidity in the lower atmosphere are currently difficult and expensive to obtain. For this reason, there is interest in the development of low-cost, high-volume opportunistic technologies to acquire measurements of ...
O. Lewis, O. Lewis, C. Brunt, M. Kitchen, N. E. Bowler, E. K. Stone   +5 more
doaj   +1 more source

Tropospheric profiles of wet refractivity and humidity from the combination of remote sensing data sets and measurements on the ground [PDF]

Atmospheric Measurement Techniques, 2013
We reconstruct atmospheric wet refractivity profiles for the western part of Switzerland with a least-squares collocation approach from data sets of (a) zenith path delays that are a byproduct of the GPS (global positioning system ...
F. Hurter, O. Maier
doaj   +1 more source

Investigation on Global Distribution of the Atmospheric Trapping Layer by Using Radio Occultation Dataset

Remote Sensing, 2021
The trapping layer refers to the atmospheric layer with vertical gradient of atmospheric refractivity less than −157 N-Units/km or vertical gradient of atmospheric modified refractivity 0 M-unit/km, which has a significant impact on radar and radio ...
Yong Zhou, Yi Liu, Jiandong Qiao, Mingjie Lv, Zhitao Du, Zhiqiang Fan, Jiaqi Zhao, Zhibin Yu, Jiang Li, Zhengyu Zhao, Fang He, Chen Zhou   +11 more
doaj   +1 more source

Estimation of radio refractivity from satellite-derived meteorological data over a decade for West Africa

Scientific African, 2021
Radio refractivity, which is the bending of a radio signal as it propagates through media, is very important in works involving terrestrial atmospheric electromagnetic propagation such as point-to-point microwave communication, terrestrial radio and ...
O.J. Abimbola, S.O. Bada, A.O. Falaiye, Y.M. Sukam, M.S. Otto, S. Muhammad   +5 more
doaj   +1 more source

An atmospheric refractivity inversion method based on deep learning

Results in Physics, 2019
An atmospheric refractivity inversion method based on deep learning is introduced. Atmospheric duct is an anomalous phenomenon of electromagnetic waves in the atmosphere that affects the use of radio equipment, obtaining real-time atmospheric duct ...
Wenlong Tang, Hao Cha, Min Wei, Bin Tian, Xichuang Ren   +4 more
doaj   +1 more source

Construction of a Global Atmospheric Refractivity Model for Optical Wavelengths Based on Temporal Evolution Characteristics

Earth and Space Science
Atmospheric refractivity model accuracy is important for refraction correction, starlight refraction navigation, and related optoelectronic applications.
Zhiyan Ding, Pengfei Wu, Wenyue Zhu
doaj   +1 more source

Real-Time Duct Prediction and Propagation Analysis Using Genetic Algorithm-Based RFC and Parabolic Equation Method

IEEE Access
This paper proposes a real-time prediction of the duct using a refractivity from clutter (RFC) method based on genetic algorithm (GA) and the parabolic equation (PE) method.
Jun Heo, Doyoung Jang, Hosung Choo, Dong-Yeop Na, Yong Bae Park   +4 more
doaj   +1 more source