Accession Number:

ADA229847

Title:

Radar Backscatter from the Sea Controlled Experiments

Descriptive Note:

Final rept.

Corporate Author:

KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE RADAR SYSTEMS AND REMOTE SENSING LAB

Personal Author(s):

Report Date:

1990-11-01

Pagination or Media Count:

4.0

Abstract:

This is the final report on ONR Grant N00014-89-J-3022. Since most of the work was in journal articles, conference proceedings, and reports, this report is brief. Work continued, and was largely concluded, on analysis of the TOWARD, SAXON-CLT, and NILDEX data sets. Comparison between optical and radio measurements of ripple spectra at TOWARD showed favorable results. Although the wind direction was usually unfavorable for SAXON-CLT, we obtained useful data on modulation in the crosswind direction. We also demonstrated that a vector slope gauge can work, but for logistic reasons its deployment made its footprint close to the tower. Hence, the data are useful only for proof of concept, not for oceanographic application. A new theory of SAR imaging of the ocean was developed. It incorporates elements of previous theories, but shows an improved way to find out the effects of signal modulations on the observed spectra. It confirms, by a different method, the results from several other theoretical and experimental studies on processor focus adjustment. These show optimum image contrast occurs for along-track wave motion when the processor is set to phase velocity2. The method of analysis used allowed closer examination of the basis for the two-scale Bragg resonance with slope modulation model for ocean backscatter. The results cast some doubt on the validity of the Bragg-scatter model for explaining many observed phenomena.

Subject Categories:

  • Active and Passive Radar Detection and Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE