NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Microwave Propagation Attenuation due to Earth's Atmosphere and Weather at SHF BandIn this study we have estimated radio wave propagation losses at super high frequency (SHF) band by applying available propagation models into several Air Force benchmark scenarios. The study shows that dominantly additional losses over the free space loss are atmospheric absorption, clouds, fog, and precipitation, as well as scintillation /multipath at low elevation angles. The free space loss equation has been modified to include all atmospheric attenuation and fading effects that cannot be neglected over the range of frequency of interest. Terrain profiles along all directions of interest within the coastal areas and inland areas for four benchmark cases have been analyzed in detail. We find that while the atmospheric gaseous absorption plays a significant role under a clear weather, heavy rainfalls can cause several tens of dB loss for a 100- km path through the rain. At very low elevation angles (< 5 deg), atmospheric scintillation/multipath fading becomes a very important factor. There are significant differences in the feature of anomalous mode (ducting) propagation between the east and the west coastal receiving stations.
Document ID
20080018561
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Ho, Christian
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wang, Charles
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gritton, Kelly
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Angkasa, Kris
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
October 31, 2004
Subject Category
Communications And Radar
Meeting Information
Meeting: Military Communications Conference, MILCOM 2004
Location: Monterey, CA
Country: United States
Start Date: October 31, 2004
End Date: November 3, 2004
Sponsors: Armed Forces Communications and Electronics Association
Distribution Limits
Public
Copyright
Other
Keywords
atmospheric absorption
radio waves

Available Downloads

There are no available downloads for this record.
No Preview Available