Accession Number:

AD0485829

Title:

DETECTION PROBABILITIES FOR LOG-NORMALLY DISTRIBUTED SIGNALS

Descriptive Note:

Rept. for 1 Jan-15 Feb 1966

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Report Date:

1966-04-01

Pagination or Media Count:

103.0

Abstract:

The amplitude and power of a large family of radio signals are observed to have log-normal probability density functions. Among these are signals propagated through random inhomogeneous media, a notable example being low frequency atmospheric radio noise. Of greater importance are certain radar targets that have been observed to have essentially log-normal density functions. Both ships and space vehicles may fall into this category. Curves of probability of detection versus signal-to-noise ratio for the case of log-normal signals in Gaussian noise have been computed and are presented. The curves apply for square-law detection with varying degrees of post-detection linear integration. Both slowly and rapidly fluctuating signals are considered. It is shown that for log-normal signal distributions having large variances the probability of detection differs significantly from that obtained using curves based on an assumed Rayleigh signal distribution.

Subject Categories:

  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE