Accession Number:

AD0493239

Title:

QUANTITATIVE MEASUREMENTS OF RADAR ECHOES FROM AIRCRAFT VIII. B-45

Descriptive Note:

Memorandum rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1953-01-28

Pagination or Media Count:

49.0

Abstract:

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.

Subject Categories:

  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE