Calculated Performance of Some Radar and Transmissometer Systems in Rain and Fog at 35, 94, 140 and 240 GHz. Volume 1

摘要

The effects of rain and fog are examined for three transmissometer and three radar systems: double-ended (direct path) with square-wave modulation and square-law detector; single-ended (folded path) with square-wave modulation and square-law detection, single-ended CW with quadrature receiver, single-ended pulsed with post-detection pulse integration, single-ended pulsed with quadrature receiver, and single-ended with linear FM pulse compression. Computer algorithms were developed to find the probability of detection as a function of range for the radar systems, and the signal-to-noise ratio as a function of range for the transmissometer systems. These algorithms are used recursively to determine the range at which specified performance is attained as a function of rain rate of fog liquid water content. Calculated results are presented for exponential drop-size distributions; provision has been made for the extension to other distributions. Volume I contains the theory and results; computer code listings and directions for use of the codes are given in Volume II. (Author)