Parametric Error Analysis of Tropospheric Propagation Effects,
NAVAL RESEARCH LAB WASHINGTON DC COMMAND CONTROL COMMUNICATIONS COMPUTERS AND INTELLIGENCE
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The effects of tropospheric radiowave propagation have been studied based on parametric approach and ray tracing graphs with empirical data supplied by the National Climatology Data Center in Asheville, North Carolina. Correlation among parameters such as temperature, pressure, relative humidity, refractivity and elevation angles has been extensively investigated for effects on range errors and elevation angle errors. Studies of lapse rate, refractive index and time delays are also included for the completeness of relational functions among parameters that directly affect both range and angle of arrival errors. Results indicate that range and angle errors vary quite dynamically by season and month, and in region. The errors in the low-elevation angles less that 10 deg are higher than expected, and those errors should not be neglected for higher accuracy requirements.
- Radiofrequency Wave Propagation