Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Hubert Chew"'
Publikováno v:
2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC).
A radio frequency (RF) propagation model that can accurately predict the power received by one antenna from an RF signal that is transmitted by another antenna over an imperfectly conducting ground has many applications in link budget analysis and in
Publikováno v:
2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC).
We investigate whether a Gaussian initial field approximation is adequate for use in a split-step parabolic equation-based propagation model. Of particular interest is the case when the model is used to predict the propagation loss to areas that are
Publikováno v:
2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC).
To assess accurately the radio frequency (RF) interference between operational satellite tracking stations and commercial wireless stations (current or future cell towers), validated and accurate RF path loss estimates are needed. The Aerospace Radio
Publikováno v:
2021 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC).
Both terrain profile and near-ground meteorological conditions can have significant effects on the propagation of Radio Frequency (RF) radiation, especially for near-ground propagation paths. High-resolution terrain data obtained from the United Stat
Autor:
Evangelos Petsalis, Lan Xu, Steven M. Beck, Hubert Chew, Brandon R. Yee, Valerie I. Lang, Jinyoung Jang
Publikováno v:
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.
A mobile receiver system was developed under the Air Force Spectrum Transition Plan1 as part of an effort to model propagation loss accurately over a variety of terrain and environmental conditions. In this paper, we describe the mobile receiver syst
Autor:
Jinyoung Jang, Evangelos Petsalis, Valerie I. Lang, Brandon R. Yee, Lan Xu, Steven M. Beck, Hubert Chew
Publikováno v:
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.
In this paper, we investigate the differences between publicly available propagation models, International Telecommunication Union (ITU)-R P.452-15 and Irregular Terrain Model, that are utilized for large scale planning against a site-specific model,
Autor:
Hubert Chew, Srini H. Raghavan
Publikováno v:
2018 IEEE Aerospace Conference.
Improving spectrum use to enable existing and upcoming modern communication and navigation services has increased the potential for interference. This potential is a critical issue that must be addressed carefully, to avoid degrading the performance
Autor:
Bernard F. Vecerek, Hubert Chew
Publikováno v:
26th International Communications Satellite Systems Conference (ICSSC).
If a radio frequency user incurs a cost that reflects the value of its radio frequency spectrum assignment, it will tend to use spectrum efficiently. This report describes a practical model that computes a lower bound for the value of spectrum assign
Autor:
Hubert Chew
Publikováno v:
24th AIAA International Communications Satellite Systems Conference.
There is current interest in determining the capabilities and costs of a new mobilesatellite service (MSS) system that would serve the United States Government in a military or civil capacity. This MSS system would provide a communications link betwe