QUANTITATIVE MEASUREMENTS OF RADAR ECHOES FROM AIRCRAFT VIII. B-45
NAVAL RESEARCH LAB WASHINGTON DC
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B-45 echo amplitudes, sampled over more than four degrees of azimuth, are nearly Rayleigh-distributed for X, S, and L bands. Averaged over all observed aspects, except the aspect range 85-95 degree, the median radar area of the B-45 is about 12 square meters on all three radar frequencies. Averaged over all observed aspects, the B-45 radar area is about 3 times greater, owing to the large broadside echo. The aspect diagrams show a relatively wide, high peak at broadside on all three frequencies. Echoes from the leading edges of the wings are prominent at aspects near head-on. Spectrums of the B-45 echo were obtained for aspects near head-on, near broadside, and toward the tail. A continuous distribution of fluctuation frequencies was found notably in the head-on spectrums, with the significant fluctuation frequencies tending to increase with increase in radar frequency. The near-broadside spectrums are dominated by two discrete fluctuation frequencies probably arising from interference between echoes from the nacelle, the wing tank, and a portion of the fuselage near the tail. This and other features of the B-45 echo behavior are discussed from a theoretical point of view.
- Active and Passive Radar Detection and Equipment