TERRAIN AND WEATHER EFFECTS ON DOPPLER RADAR NAVIGATION SYSTEMS.
NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J
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The effects of terrain and weather conditions upon airborne doppler radar performance are described. The extensive flight test data compiled by military and commercial users of the doppler radar and theoretical knowledge of propagation and scattering theory were used as a basis for this study. The effects of terrain and weather are analyzed in terms of the effect upon the signal-to-noise ratio received at the doppler set. In addition, the effect of intense rin cells upon the accuracy of the sensed velocity vector is dscussed. Doppler signal attenuation due to atmospheric gases and various weather conditions is given. Charts illustrate the reduction of signal strength due to increased aircraft operating altitude and increased speed. The need for adequate signal reserve in high-performance aircraft such as the supersonic transport is indicated. Author