Accession Number:

ADP006139

Title:

Cross-Frequency Correlation of Intensity Fluctuations in Phase-Changing Media,

Descriptive Note:

Corporate Author:

CAMBRIDGE UNIV (UNITED KINGDOM) DEPT OF APPLIED MATHEMATICS AND THEORETICAL P HYSICS

Personal Author(s):

Report Date:

1987-05-01

Pagination or Media Count:

4.0

Abstract:

The cross-correlation of intensity fluctuations at two different wave frequencies is a useful tool in remote sensing of sources and random phase changing media. The cross-spectrum of these fluctuations is investigated here for the model of a deeply modulated phase changing screen. An analytic expression is obtained for this spectrum and the effect of increasing frequency differences is demonstrated. Finally, the statistics of the wave fields in the far field are examined by comparing the second and fourth moments. It is shown that the relationship of these moments is consistent with the assumption that the statistics of a monochromatic field are normal in the far field, but inconsistent with wave fields of different frequencies having a joint normal distribution there. Author

Subject Categories:

  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE