Accession Number:

ADA133064

Title:

The Dependence of the Radar Modulation Transfer Function on Environmental Conditions and Wave Parameters (A Contribution to Studies of Radar Backscattering from the Sea Surface). Revision.

Descriptive Note:

Final rept. Jun-Aug 83,

Corporate Author:

WEISSMAN (DAVID E) NORTHPORT NY

Personal Author(s):

Report Date:

1983-08-01

Pagination or Media Count:

30.0

Abstract:

This report shows how the Modulation Transfer Function, an important quantity for remote microwave sensing of ocean wave spectra, will vary with environmental conditions that control the air-sea interaction. The accuracy with which this quantity is known will determine the quality of remote measurements of ocean wave spectra. Microwave remote sensing of individual ocean wavelengths and the complete directional spectrum is based on synchronized reflectivity variations along each wave, that the radar can resolve spatially. This study demonstrates that the MTF, which is the ratio of this reflectivity amplitude of variation to the ocean wave amplitude, is affected by the air-sea interaction, in addition to the hydrodynamic interaction between capillary and long gravity waves. Recent measurements by the Naval Research Laboratory of the ocean wave-radar modulation transfer function MTF from fixed ocean platforms, over a period of several years, have demonstrated that the local hydrodynamic modulation of short centimeter waves is affected by the air-sea interaction. Results from widely separated ocean regions also show different individual properties, that make detailed measurements necessary.

Subject Categories:

  • Meteorology
  • Physical and Dynamic Oceanography
  • Statistics and Probability
  • Active and Passive Radar Detection and Equipment
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE