Accession Number:

ADA160576

Title:

A Semiempirical Model for Doppler Spectral Features of Microwave Radar Sea Scatter.

Descriptive Note:

Interim rept. Jun-Oct 84,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1985-10-16

Pagination or Media Count:

32.0

Abstract:

A semiempirical, fetch-dependent model is developed for Doppler spectral features of low grazing angle microwave radar sea scatter and is fit to data previously published in the literature. The model introduces this fetch dependence to account for the scatter in plots of the shift of the peak of the radar sea scatter Doppler spectrum data vs measured wind and surface parameters. First, constants for the model are determined by empirically curve fitting generalized versions of J. Darbyshires fetch model equations to surface truth data wind speed, wave height, and wave period, plotted in various combinations against one another, for 24 different experimental conditions. These constants are then applied to equations representing the Doppler shift of the peak of the sea scatter spectrum in terms of the surface truth data. Curves parametric in fetch, which are determined from these equations, are then superimposed over plots of the measured radar Doppler peak shifts vs the surface truth. It is found that these curves lie near the same groups of points in these plots of radar data vs surface truth, as the modified Darbyshire curves did for surface truth sets against one another.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE