Low-Altitude Millimeter-Wave Propagation in the Evaporation Duct
Abstract
One-way, low-altitude radio propagation measurements at 94 GHz and simultaneous surface meteorological measurements were made on a 40.6-km over- the-horizon, over-water path along the southern California coast to assess the effects of the evaporation duct on signal propagation. More than 2000 hours of received signal power were recorded in eight measurement periods from July 1986 through July 1987. The average received power was 63 dB greater than expected for propagation in a nonducting, or standard, atmosphere; 90% of the measurements were at least 55 dB greater than the standard atmosphere. Predictions of transmission loss based on the observed surface meteorology compared favorably to the measured transmission loss; on the average, the predictions underestimated the transmission loss by 10 dB. The reliability and reasonable accuracy of the model provided a strong justification for utilizing the technique to assess millimeter-wave communication and radar systems operating in many, if not all, ocean regions. Keywords: Evaporation duct; Radio propagation; Numerical modeling; Millimeter wave communication; Over-the-horizon signal propagation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1989
- Accession Number
- ADA214432
Entities
People
- K. D. Anderson